In order to reduce the size of magnetic head in hard disk manufacturing, an important assemble process required to further develop is an adhesive dispensing at controllable small amount in order of nanoliter. Together with the confined tiny space during assembly, the exposure of UV light for rapid adhesive curing may not be possible thus the shadow curing with shorten period is also needed to...
Nanotechnology are beneficial for safe and efficient consumption of food, water and agricultural products. The NANOTEC-CU center of excellent on food and agriculture has focused the research in molecular design, synthesis and fabrication of nanomaterials for applications in the field of food and agriculture including chemical analysis and delivery systems. Various chromophores and fluorophores...
Nanocellulose is a cellulose-based material that possesses at least one of its dimensions in the nanometer range. Due to its unique characteristics, including its excellent mechanical properties, high degrees of thermal stability and water holding capacity, biodegradability and biocompatibility, nanocellulose is a promising naturally-derived material that can be used for various biomedical as...
Highly dispersed Ni and Cu nanoparticles on SBA-15 were successfully prepared by a modified impregnation route and evaluated in hydrogenation of methyl levulinate to γ-valerolactone (GVL). This catalyst was mainly characterized by such techniques as high resolution transmission electron microscopy, X-ray diffraction, N2 adsorption-desorption analysis, H2 temperature-programmed reduction. It...
It is well known that many physical properties of materials can be determined by the existence of point defects, which might be intentionally or accidentally added to the materials. For example, the electrical conductivity of Al-doped ZnO sample can be decreased by the presence of Zn vacancy (VZn) defect, which might be unintentionally created under O-rich growth conditions. In...
Freshness of products is a key factor for food industry to monitor to ensure high quality products and retain customers’ satisfactory. Integrity package is capable of pointing out the quality of the products, based on the reaction between indicator and metabolites of spoilage microorganisms. In these regards, detection of volatile compounds such as ammonia gas is one of effective approaches in...
Elongating filaments systems, such as actin, are polymerizing motors that drive movement in many biological processes. The actin filament is astonishingly well conserved across a diverse set of eukaryotic species. It has essentially remained unchanged in the billion years that separate yeast, Arabidopsis and man. In contrast, bacterial actin-like proteins have diverged to the extreme, many of...
Optical Coherence Tomography (OCT) is an optical imaging technology that produces cross-sectional image similar to that obtained by Ultrasound imaging but at much higher resolution, higher imaging speed, and higher sensitivity. Unlike other optical microscope, OCT utilizes low-coherence properties of the broadband light source to gate the sample’s microscopic structure over depth and hence is...
Graphene, emerging as a true 2-dimensional material, has received increasing attention due to its unique physicochemical properties (high surface area, excellent conductivity, high mechanical strength, and ease of functionalization and synthesis). Printed Electronic also is a new wave of large-area electronics and flexible electronics manufactured by printing technology. The fusion of these...
F-doped ZnO nanorod were synthesized via hydrothermal process with variation of processing temperature and Fluorine doping contents (0-10%) starting from zinc oxide thin film as a seeding layer for nanorod growth. The zinc oxide seeding thin film was prepared by sol-gel spin coating at 2000 rpm on glass substrate using zinc acetate precursor with annealing at 500 °C in air for 2 h. Ammonium...
A simple electrosping system for fabrication of core-shell nanofibers
Chaturong Nettonglang1 and Santi Maensiri1,2,3
1School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand.
2SUT CoE on Advanced Functional Materials (SUT-AFM), Suranaree University of Technology, NakhonRatchasima, 30000, Thailand
3SUT-NANOTEC CoE on Advanced...
The feasibility of using lime residues after juice extraction as a raw material to produce nanocellulose was determined in this study. Different processing schemes were applied by varying the pretreatment and defibrillation methods and conditions. Autoclaving at 110-130 C was performed as a pretreatment to remove hemicellulose and pectin from the native fiber. The fiber images obtained from...
A systematic investigation of CO_{2} electroreduction to CH_{3}OH on copper-based alloys stepped (211) surfaces was performed using density functional theory calculations associated with the standard hydrogen electrode model. The interaction of the key C_{x}H_{y}O_{z} intermediates is shown to be related to the CO adsorption energy due to the similar charge transfer characteristics of the C−O...
Magnesium ferrite ($MgFe_{2}O_{4}$) is one of the magnetic materials in spinel ferrite group which could be utilized for using in adsorbent applications due to their removability from medium solution by applying external magnetic field [1,2]. The capability of functionalization by grafting specific functional groups on their surfaces provide the possibility to synthesize the different types of...
Caffeic acid phenethyl ester was successfully prepared by rapid expansion of supercritical solutions into liquid solvent. An average size of these CAPE nanoparticles was characterized by TEM and DLS techniques. They were found that diameters CAPE-NPs were ~40 to ~400 nm. The minimum inhibitory concentrations (MICs) and the minimum bactericidal concentration (MBCs) of CAPE nanoparticles were...
This research was focused in two parts, experimental results and regression model. First, the research was studied on the proportion of cylindrical length that affected to the separation efficiency using a 40 mm hydrocyclone. The effects of cylindrical lengths of 60, 80 and 100 mm were investigated. The tested suspension was the mixed of silica and water. The silica particles have an average...
Melatonin (N–acetyl–5–methoxytryptamine) is a natural hormone produced by the pineal gland, located behind the third ventricle in the brain that it is used to control the human sleep cycle. Consequently, it has been widely used as a drug for the treatment of the sleep disorder. Melatonin encapsulated niosome particle is an important key for drug delivery application. It is well–known that the...
Carefully controlled core-shell nanoparticles can be used in biomedical applications, e.g., as biomedical imaging contrast agents, for hyperthermia and in drug delivery [1, 2], as well as for biotechnological applications such as separation and purification. Unique material functions can be achieved by using nanoscale inorganic cores, such as plasmonic or superparamagnetic interactions with...
During the last decade several literature surveys on “Nanotoxicology” have shown that most of the published data on toxicological effects of nanoparticles or nanomaterials is not useful for risk analysis or risk assessment of these materials1, 2. Although the evaluated publications use buzz words such as “toxicological effects”, “risk assessment”, “toxicity” or “genotoxicity” most of them do...
Cancer is the leading cause of death in Thailand. Despite advances in cancer research during the past decades, the survival of cancer patients has only marginally improved and the cure remains unlikely. Complex genomic heterogeneity and limited drug delivery represent major obstacles for effective antineoplastic treatments. Thus, new therapeutic strategies to increase drug delivery may improve...
Metal-oxide semiconducting (MOS) Nanostructures prepared by microwave assisted thermal oxidation technique are demonstrated. With this simple and fast process, MOS nanostructures with various morphologies can be synthesized such as ZnO tetrapods, interlinked ZnO tetrapod networks (ITN-ZnO), MgO nanoparticles, CuO/Cu2O fibers. Mostly, ITN-ZnO morphology which have tetrapod-like features with...
Interface and surface become important playgrounds for unconventional superconductivity, since they bring broken symmetry, competing orders, charge transfer, strain and other factors into the problem. Recently, interfacial superconductivity up to 75K has been discovered in FeSe/STO and FeSe/BTO interfaces [1,2]. In this talk, I will demonstrate that the combination of angle resolved...
Thailand is currently in the stage of moving forward in the area of humane science by reduce, refine and replacement of animals, knowing as the 3Rs principle, in research and development of consumer products. With this regard, the Thai Food and Drug Administration (FDA), Ministry of Public Health, has adopted ASEAN cosmetic directive for non-animal testing of cosmetics. Meanwhile, the use of...
Novel biodegradable nanocomposite blown films based on compatibilized poly(lactic acid)-poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends were fabricated for use as packaging for dried longan. Silver-loaded kaolinite (AgKT) dispersed in the polymer matrix as intercalated-exfoliated microdomains improved the properties of the films, in particular the moisture barrier properties. In...
Poor oral absorption and rapid enzymatic degradation are the major hurdles in to deliver peptide drugs orally and vaccines via the mucosa. We developed stable, orally available peptide drugs through the chemical addition of specifically designed lipids and carbohydrates, creating amphiphilic compounds capable to reassemble to form nanoparticles.Fertility is controlled by decreasing the level...
Novel phenomena such as indirect to direct band gap transition, giant exciton binding energy, spin-valley-layer locking and polarization dependent valley control are attractive features of transition metal dichalcogenides (TMDs). Especially, the layer dependent indirect to direct band gap transition raised enormous interest in TMDs. There have already been many efforts to control the band gap...
With the increase of nano-consumer using nanomaterials, the potential exposure to nanomaterials have been raised. Therefore recently the human and environmental impacts of nanomaterials have emerged as an issue. However, there are no suitable methods to evaluate the cytotoxicity of nanoparticles based on high-throughput screening method. High-throughput approaches allow the bulk of the...
Carbon nanofibers composite with manganese or copper manganese ferrite (CNF/MFe2O4: M = Mn, CuMn) have been successfully fabricated by a combination of electrospinning and heat treatment process. The structure and morphology of prepared samples were characterized by means of TGA, XRD, SEM, BET, XAS and XPS. The potential application of the prepared samples as an electrode material for...
Hydrogen is a promising candidate for the clean energy carrier that may replace fossil fuels. For the production of hydrogen, water splitting with efficient catalysts has been intensively studied over the past decades. Platinum, which is known to be the best catalyst for water splitting, is too expensive to be used in large-scale applications. Therefore, numerous earth-abundant materials have...
Nanotechnology and Health
Teerapol Srichana
NANOTEC-PSU Excellence Centre on Drug Delivery System, Department of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hat-Yai, Songkla 90112, Thailand
Email address: teerapol.s@psu.ac.th
Nanomedicine and nanotechnology provides an early detection and prevention of diseases resulting in improved...
Nano information is crucial for nano safety along the life cycle of nanomaterials. Transparency on nano content offers advantages for producers, downstream users and consumers of nanoparticles. There are differences is the nano perception between different continents. Consumers in Asian countries like to buy nano products with nano particles because they appreciate the advantages of nano...
In this work we report the dc bias effect on dielectric properties and nonlinear current-voltage behaviors of Bi1-xBaxFeO3 (where x = 0, 0.05, 0.1, 0.2, and 0.3) ceramics synthesized by a co-precipitate process. Structural studies using X-ray diffraction (XRD) show the formation of small amount of second phase (Bi2Fe4O9). Ba-doped samples show the Rhombohedral (R3c) and Orthorhombic (Pbam)...
Alkali metal intercalation in layered-transition metal dichalcogenides (LTMDs) has been intensively studied due to a wide range of attractive properties such as enhancement of superconductivity, quasi-freestanding, and negative electron compressibility which lead to many potential nanoelectronic applications. Essentially, many researchers study the correlation between electron doping and...
Ce1-xFexO2 nanofibers (NFs) and nanoparticles (NPs) (x=0, 0.08 and 0.10) were prepared by electrospinning and the simple solution process, respectively. Each of sample was calcined at 500, 600, 700, and 800 ˚C. The calcined samples were characterized by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS),...
A two-dimensional electron gas (2DEG) (confined electron which is free to move in two dimensions at the interface/surface) was discovered at the LaAlO$_3$/SrTiO$_3$ interface; later on 2DEG was also observed at the bare surfaces of SrTiO$_3$ and KTaO$_3$. This system can enhance some physical properties (i.e. superconductivity and ferroelectric polarization) as well as the novel properties...
Abstract
By the use of nanotechnology in the development of bioassay kit, the ideal goals that inevitable are rapid, convenience and cost effective. Through our knowledge toward Human Immunodeficiency Virus-1/Acquire Immunodeficiency Disease (HIV-1/AIDS), we successfully produced a novel test kit for investigating both of HIV protease activity and HIV-1 protease inhibitors (PIs). This...
Two 8-aminoquinoline derivatives, Q1 and Q2, containing one and two quinoline groups, respectively, are synthesized. In water, Q1 and Q2 showed strong electronic absorption peaks at 340 nm and 350 nm, with molar extinction coefficients of 3605 and 2475 M-1cm-1, respectively. The solutions are weakly fluorescent having quantum efficiency below 10%. In the presence of metal...
Nanomaterials is well-known for their versatile applications in electronics, medicals, chemicals, catalysts as well as environments. By tuning their size, shape, morphology, and composition, one could systematically change their chemical, physical, electrical, mechanical, and catalytic properties. In this contribution, we chemically synthesized complex gold and silver nanostructure...
Nanocatalysts have played an important role in biorefinery and advanced biofuel applications. The conversion of cellulosic biomass feedstocks to platform biochemicals, such as organic acids and furans, is one of the key steps in biorefining. In our research group, metal phosphate catalysts have been developed for production of 5-hydroxymethylfurfural from C6 sugar. Incorporating metal species...
Photoemission electron spectroscopy (PES) is a powerful technique that provides information about chemical composition and electronic structure of a material surface. In this talk, the basic concepts and methods of PES will be introduced. The PES experiment facilities at the Siam Photon Laboratory, Synchrotron Light Research Institute (SLRI), will be overviewed. Examples for its applications...
Recently, gas sensor based on the simple change in its resistance in response to the analytes, has been focused as a promising candidate for practical sensing devices. Several nanostructured materials such as carbon nanotube (CNT) and graphene, have attracted considerable attention as alternative sensing materials because of their distinctive characteristics in structural, electrical and...
Nanomaterials have enormous economic potential for technical and medical applications due to their new properties acquired on the nanoscale. However, given multiple exposure pathways from the raw material production to the final product and its disposal, it is necessary to understand where and how nanomaterials can be released, and how this release can lead to exposure of workers, consumers...
Dye-sensitized solar cell (DSSC) has emerged as one of the most attractive photovoltaic devices because it offers the possibility of low-cost conversion of photoenergy.Ruthenium complex dyes are currently the most efficient dyes. These dyes, however, are costly and hard to prepare in high yields,which have ledto the evolution of metal-free organic dyes.Organic dyes exhibit not only higher...
We reported the effect of boron addition on magnetic properties and structure of CoPt nanoparticles. The CoPt-B nanoparticles were synthesized by means of the polyol process. The magnetic property measurement showed that the CoPt-B sample exhibited a much larger coercivity compared to the sample without B additive at the same annealing temperature. Transmission electron microscopy and energy...
A survey of 512 students from two local universities revealed that perception of nanotechnology regarding its importance to Thailand's economy and personal welfare was overall positive. Students especially 'agreed' or 'strongly agreed' with survey questions that focused on government support and regulation of nanomaterials and nano-labelling and were overwhelmingly in favor of developing a...
A simple thermal oxidation has been used for fabricating nanostructured NiO/NFs electrodes at a temperature lower 1000 ͦC in air. The results obtained from x-ray diffraction (XRD) and scanning electron microscope (SEM) have shown the structure and morphology of Ni foam (NFs) before and after oxidation. The electrochemical characterization measurements have shown that the NiO/NFs electrodes are...
The attractive properties of diamond-like carbon (DLC) films consist of chemical inertness, high hardness, excellent tribological behavior, optical properties, and biocompatibility.1,2 These properties make them reasonable for using in a broad range of the industrial applications. For example, the DLC films are used for magnetic storage disks, automotive parts, biomedical devices, cutting...
Deoxygenation of vegetable oil has been employed as one of important processes for highly efficient production of renewable green diesel (bio-hydrogenated diesel). Moreover, to avoiding sulfur contamination in fuel product, metal oxides, metal phosphides, and metal nitrides have become attractive. In this work, bimetal oxide catalysts over supported alumina were selected to produce...
Taiwan Nanotechnology Program has been launched from 2003 up to now in which nano-EHS program remains one of the main projects collaborated by many different agencies, including Taiwan MOST, EPA, ILOSH, MOHW, BSMI, universities and research institutes (ITRI, NHRI etc.). Through inter-agency efforts, progress has been made in core facility establishment for nanomaterial characterization,...
The titanate nanotubes (TNTs) were synthesized by hydrothermal method and were composited with silver oxide nanoparticles (AgO) in various 1, 5, 10 wt.%. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray microscopy (EDX), and ultraviolet-visible spectroscopy (UV-vis). The...
Zinc Ferrite (ZnFe2O4) nanopowders were synthesized by ball-milling technique at different milling times (0 to 24 h) starting from as-combusted powders. The XRD and SEM results ensure significant decrease in particle size of these ferrites with increasing processing time. The distribution of cations including zinc (Zn2+) and ferric (Fe3+) ions was investigated by Zn and Fe K-edge X-ray...
The external magnetic field was applied in a packed-bed reactor based on the concepts of green and sustainable production of alternative fuels through CO2 hydrogenation reaction. Accordingly, the roles of magnetic flux density and magnetic field direction on the performance of Fe-Cu/MCM-41 catalyst with intrinsic magnetic property were investigated and compared to that of without magnetic...
In this study, we report the magnetic properties of BiFe1-xCoxO3 nanoparticles (with x = 0.05, 0.1, 0.2, 0.3) synthesized by a simple solution method. The prepared samples were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray absorption spectroscopy (XAS). The crytallize size calculated by using the Debye–Scherer equation decreases with...
The investigation of the local geometric and electronic structure of probing element in bulk samples is the most extensive field of application in X-ray Absorption Spectroscopy (XAS). XAS consists of two main regions which are X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The former region is used to explain the local geometry and oxidation...
Nanotechnology has been implemented in the construction industry and one application is the use of photocatalytic cement which is Portland cement containing titanium dioxide (TiO2) nanoparticles. Photocatalytic cement makes the surface white without the need of paint. TiO2 acts as a biocide making the surface selfcleaning.
However, TiO2 is a human carcinogen (Group 2B; IARC) and construction...
Cellulose, extracted from plant, has been widely used in various purposes especially in paper industry. In industry, cellulose is modified by many organic and inorganic substances in order to improve the quality like smoothness, whiteness and mechanical strength. However the deterioration of the paper according to the degradation of cellulose has been found in many ancient documents and...
Ce1-xMnxO2 (x = 0.05, 0.075 and 0.1) nanoparticles were synthesized by simple solution method using cerium(III) nitrate hexahydrate manganese (II) nitrate hydrate (Mn(NO3)2∙H2O) and freshly extract egg white (ovalbumin) in an aqueous medium. The precursors were calcined at 600 °C for 2 h in air. The nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscopy...
The new composite materials of TiO2 nanoparticles and biomolecules are promising to provide the potential alternative for improving the photocatalytic activity by merging the ability and features of both material types. In this research, the unique visible light-responsive chlorophyll and magnesium (Mg) co-modified P25 catalyst (Chl-Mg/P25) was successfully synthesized by using a simple...
III-V solar cells have been extensively studied in both theoretical and experimental aspects. The efficiency of the solar cells can be enhanced by the insertion of quantum structures as a result of the quantized energy levels at which photons with energy lower than the host material can be absorbed. A window layer made of a wide band gap material increases the absorption of high energy photons...
Abstract
Photocatalytic activity of Zinc stannate (Zn2SnO4) ZTO described in our previous work [1, 2] depict that ZTO nanoparticles have comparable photocatalytic activity to other photocatalyst such as Zinc Oxide (ZnO) nanoparticles and Titanium dioxide (TiO2) nanoparticles. The aim of this work is to explore the effect of annealing i.e. high temperature behavior on size, morphology...
BL1.3W: SAXS/WAXS (Small/Wide angle x-ray scattering) at SLRI is a dedicated beamline for nano-structural investigation of material that has electron density fluctuation on the length scale under 100 nm. High intensity x-ray is obtained by incorporating the synchrotron radiation from a wiggler insertion device and a double multi-layers monochromator. The beam is focused by a toroidal mirror...
A new palladium nanoparticles catalyst supported on individual calcium carbonate plates (Pd/ICCP) is prepared from Asian green mussel shells and used as heterogeneous catalyst in Suzuki cross coupling reaction. The reduction of palladium (II) generates palladium (0) nanoparticles which can embed on individual calcium carbonate plates (ICCP) to give Pd/ICCP. The prepared Pd/ICCP catalyst is...
Nanomaterials have a vast range of applications in various fields due to their superior properties. There are a number of methods for nanoparticle-thin film coatings, for example spray pyrolysis, electrodeposition, spin coating and sol-gel process. However, these methods are either time consuming or require the use of toxic substances. The sparking method can be used to prepare nanoparticles...
The National Nanotechnology Centre under the Ministry of Science, Technology and Innovation Malaysia is embarking a 5-year project on benchmarking studies for risk assessment of nano-based products. Four major activities have been outlined. First activity will look into the distribution of nano-based products in the local market and the nanomaterials involved. Data will be used to develop an...
Density functional theory (DFT) and time dependent DFT (TDDFT) were used to study on electronic and photoelectrochemical properties of monascus, cochineal, lac insects and anthocyanin dyes. The low-cost dye-sensitized solar cells (DSSCs) utilized by crude and pre-concentrated anthocynins extracted from mangosteen pericarp, roselle, red cabbage, Thai berry, black rice, blue pea and purple corn...
Smell, taste, appearance and flavor are central to the value of agricultural products, especially fruits and their post-harvest spin-offs such as teas, coffees and wines. In specific, the uniqueness of a wine depends on types and ratio of such aroma molecules collected in the leaves or fruits during the growing seasons, which is related to many external factors such as soil conditions,...
Titanium dioxide (TiO$_2$) is a promising material for versatile applications, i.e., air-water purification, anti-fogging, anti-corrosion. However, those applications are limited to the available of the appropriate light source. To overcome this problem, modification with energy storage substances such as WO$_3$ [1], Phosphotungstic acid [2] and TiO$_2$-V$_2$O$_5$ [3] is applied. An energy...
In this study, CeO2photocatalyst was modified by composite with SiO2 to increase efficiency and improve photocatalytic activity. The as-prepared SiO2 particles have been incorporated into the precursor mixture of CeO2 by homogeneous precipitation and subsequent calcination process. The phase compositions of CeO2 before and after compositing with SiO2 were identified by X-ray diffraction (XRD)....
In this paper, gold nanoparticles were synthesized by means of a green approach with T. triandra leaf extracts under different conditions. No additional reducing or capping agents were employed. The gold nanoparticles were characterized using UV-visible spectrometry, transmission electron microscope, X-ray diffraction and Fourier transform infrared spectroscopy. Gold nanoparticles that had...
A highly sensitive turn-on fluorescent sensor for cyanide was developed based on benzylidenes containing methylindolium group. Three benzylidene derivatives were synthesized from the condensation reactions between benzaldehyde derivatives and methyleneindoline. Only one of these three derivatives shows strong visible blue fluorescence selectively to cyanide which was clearly observed in...
Keywords: Impedance spectroscopy; Lithium iron phosphate; Electronic conductivity;
The ever-growing public and now commercial sentiment supporting the widespread adoption of low and zero-emission vehicles, it is unsurprising those Li-ion batteries which currently assume the bulk of the cost of electrified vehicles. The main challenge is obtaining cathode material with high energy density,...
Glasses are source of material have properties like low cost, easy to prepare, high transparency at room temperature, hardness along with sufficient strength, excellent electrical resistance, absence of the grain boundaries and continuously variable composition for the optical applications. Glasses doped with Lantanide ions (Ln3+) can be well developed as luminescence materials because of high...
Fluorescent-based sensors have received extensive attention due to its highly sensitive and rapid sensing ability to detect metal ions. In this study, we have developed a new BODIPY derivative, mTBODdiSalic for detection of metal ions in aqueous media. The probe has been synthesized from 2,4-dimethylpyrrole and 5-formylsalicylic acid in 4 steps and fully characterized with NMR and Mass...
By using KOH as the chemical activating agent to prepared activated carbon from pineapple leaf fiber waste as the carbon source. The structure, morphology and the surface functional groups of the as-prepared activated carbon were investigated by X-ray diffraction (XRD), field emission scanning electron microscope equipped with energy dispersive X-ray spectroscopy (FESEM-EDX), X-ray...
The objective of this work was to use the spinning waste in form of short fibres for the
preparation of nano size fillers in nanocomposite applications. The present paper concerns with the
jute fibres as the source to produce nanocellulose by high energy planetary ball milling process
and its potential applications as fillers in biodegradable nanocomposite plastics used in
automotives,...
Silver nanoparticles (Ag-NPs) were impregnated on the surface of coffee grounds (CF) (referred to as Ag-CF hybrid, having 0.44 and 0.80 % weight of Ag), for achieving water disinfection in a batch set-up. First, Ag-CF was synthesized by coating with nature-inspired nanoparticles that containing Ag-NPs on their surface. Subsequently, Escherichia coli and Staphylococcus aureus cells-killing...
The rapidly growing demand for renewable energy storages, there has been growing the interest in nanomaterials from biomass waste. One of the key to improve performance of the nanomaterial depends on the structure of materials. The rice husks (RHs) are the most agricultural biomass waste found in Thailand. They are source of SiO2 and carbon nanostructure. Nano-silica (SiO2) and activated...
A composite film of Cassava root and Poly (3,4-ethylenedioxy thiophene):polystyrene sulfonate (C/PEDOT:PSS) was prepared as a high electrocatalytic material for the counter electrode (CE) of a dye-sensitized solar cell (DSSC). The effect of sintered of Cassava root under Ar atmosphere at 1000 $^o$C was intended for increasing the conductivity, and the PEDOT:PSS was used for a strong adhesion...
Rechargeable lithium ion batteries are amongst the most advanced electrical energy storage system available today. Many families of compounds have been developed for use as cathode materials in Li-ion batteries such as layered oxides LiMO2 (M = Co, Ni, Mn, or V), manganese spinel (LiMn2O4), and phospho-olivines LiMPO4 (M =Fe, Mn, Co, or Ni). Lithium iron phosphate (LiFePO4) have become the...
The magnetite Fe$_3$O$_4$ nanoparticles have been synthesized successfully by hydrothermal method in the egg white solution. The egg white solution was used as a surfactant and it can also reduce impurity phase in samples. This work aims to study the influence of different reaction temperatures (160-220 $^o$C) on the structure and magnetic properties of the synthesized Fe$_3$O$_4$...
In this work, high efficient sensor array for sweet taste classification was demonstrated for electronic tongue application. The sensor array was fabricated by electrochemical sensors based on multiwall carbon nanotube (MWCNT) paste blending with modify electroactive species including either nickel oxide (NiO), copper oxide (CuO), cobalt phthalocynine (CoPC) or iron phthalocyanine (FePC). The...
Here, we introduce a new technique, called rapid convective deposition, to fabricate planar perovskite solar cells. This technique uses a reclining blade to draw a liquid droplet across a substrate thus advancing thin film can be deposited on a substrate. Thickness and morphology of the thin film can be controlled by deposition speed and blade angle as well as liquid volume and concentration....
Mosquito repellents can help to protect against mosquitoes which transmit many disease such as Zika, malaria, dengue and other viral diseases [1,2]. Recently, people have used the products which made of both chemical and natural mosquito repellent agents [3]. However, the fast evaporation of active ingredients in mosquito repellents limits the time protection against mosquitoes [3,4]. To...
In the 50 years of the history of DFT proposed by Professor Walter Kohn in 1964, applying this formulation, a number of ab initio calculations have been performed to explain experimental observations and to predict new materials from atomic and electronic levels. Unfortunately, recent trend is to increse number of atoms to treat complex systems and to include parameters such as U for band-gap...
Global work in the Nanoscience & Nanotechnology (NS & NT) section is with great enthusiasm a nonstop challenge in methodology development for high-quality visualization and controlled manipulation of surface and/or bulk matter properties on the nanometre scale. Logical further exciting endeavour in the field is obviously clever utilization of developed skills in the defined delicate tasks for...
Nowadays, environmental problems, for example, climate changes, overpopulation, and emerging and re-emerging diseases are considered as the global issues obstructing the human activities. In fact, environmental healthrelated problems are derived from several microbialforwhich an accurate and early detection and separation is a way to prevent the spread over. Therefore, specific sensors and/or...
Perovskite barium titanate (BaTiO3) BT-based ceramics have been of interest as one of the promising smart materials in commercial electrical components due to their non-toxic and variable electrical properties for several decades. However, these BT-based ceramics suffer from high sintering temperature requirement, low dielectric constant and high dielectric loss, causing a limitation for their...
Abstract
Self-healing materials are a class of materials that can repair themselves. This feature is very interesting because it allows for saving resources to build new materials, saving energy need to make new materials, and finally reducing the amount of waste that can contaminate the environment.
In our research, we use the power of nanotechnology to tailor new materials that are useful...
Although manganese oxide and graphene supercapacitors have been widely studied, their charge storage mechanisms are not yet clear. In this work, we have investigated the charge storage mechanisms of MnO2 nanosheets and N-doped reduced graphene oxide aerogel (N-rGOae) using in situ X-ray absorption spectroscopy (XAS) and electrochemical quartz crystal microbalance (EQCM). The in situ XAS...
Colossal dielectric responses in rutile-TiO$_2$-based ceramics were investigated. Very high dielectric performance with ultra-high dielectric permittivity $(\varepsilon ^{\prime} \approx 10^{3} - 10^{6})$ and very low loss tangent $(\tan (\delta)<0.05)$ over wide frequency and temperature ranges were achieved by co-doping with M$^{3+}$ and N$^{5+}$ ions. Good temperature stability of...
Generally, Organic LEDs can be fabricated using either vacuum deposition or wet processes. It is well known that vacuum deposition can produce high efficiency Organic LEDs. Solution processable organic light emitting diode offers simpler, cheaper method of fabrication which is compatible with the roll-to-roll and inkjeting process. However, generally solution processable LED suffers from...
SHuffle is a genetically engineered E.coli strain that allows disulfide bond formation in its cytoplasm with high fidelity. Many proteins containing disulfide bonds have been successfully expressed in SHuffle. In this study, we have expressed for the first time full length human, rabbit and mouse antibodies, along with chimeric versions, including the commercial blockbuster Humira in SHuffle...
Gel electrolytes (GEs) are used in electrochemical devices replacing liquid electrolytes in order to avoid the evaporation of solvent and to increase the stability of devices. Many additives such as polymers, carbon fillers, and inorganic fillers have been used as a matrix in gel electrolytes to increase the viscosity and the ionic conductivity of gel electrolytes. In this work, silica...
Conformational dynamics of proteins have been suggested to play crucial roles in protein-protein binding and dissociation which are the two fundamental steps of protein–protein interactions, and determine the binding affinity. Intrinsic disorder in specific protein regions plays its role in recognition and such disordered protein regions may control the degree of motion between domains and in...
We report here the production of one-dimensional carbon nanomaterials (1D-CNMs) including carbon nanotubes (CNTs) and carbon nanofibers (CNFs) via the use of the oxidative dehydrogenation (C2H2-CO2) and the acetylene (C2H2) decomposition using a catalytic chemical vapor deposition (CCVD) method. Ni was selected as the catalyst for the synthesis due to its ability to produce different types of...
Manganese cobalt spinel oxide (MnCo2O4) nanofibers were fabricated by electrospinning technique using polyacrylonitrile (PAN) as a polymer source and Mn and Co nitrates as metal sources. TGA-DSC was used to study the thermal property of the as-spun. The as-spun and calcined MnCo2O4 samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). After...
Nanomaterials have received unceasingly consideration for decades. Profuse utilizations have been afforded to raise the efficacy of research in numerous scientific fields since their discovery. This novel supplies trigger the versatility of materials properties in which diversely expedite the applications in analytical research. Due to exceptional features derived from indigenous of particles...
Self-assembly nanoparticle films from convective deposition using assistance of vibrated substrate can show optical diffraction in reflected mode, due to uniform high order surface structure. In this work, we investigated the optical diffraction from binary-nanoparticle films which were coated by two types of nanoparticle with different diameter i.e. 100 and 1000 nm of polystyrene and silicon...
Al-doped ZnO (AZO) thin films were deposited on glass and silicon substrates by magnetron co-sputtering of two targets, a ZnO ceramic target and an Al metallic target. During the samples fabrication, ZnO was prepared by RF magnetron sputtering while Al pulses were added by DC magnetron sputtering with various shutter opening conditions. During the ZnO sputtering, the Al shutter was opened...
Multiferroic materials, which exhibit both electrical and magnetic ferroic orders, have attracted much attention due to its potential application in electronics. Normally, the relation of both phenomena have to be analysed by several instruments. Here, optical-Kerr-effect properties of bismuth ferrite (100) thin film has been investigated. The Kerr rotation of light reflected from the...
In this work, we report the electrochemical properties of the KFeO2 nanoparticles synthesized by a sol-gel method. The synthesized KFeO2 nanoparticles were calcined in air at the different temperatures from 500 to 800ºC for 2 h. The X-ray diffraction (XRD) pattern confirms the phase formation of KFeO2 with the average crystallite sizes ranging of 20-50 nm. With increasing calcination...
Selective Permeability of Antimicrobial Agents through the Protein Nanopore of the Highly-Drug Resistant Melioidosis Bacterium Burkholderia pseudomallei
Anuwat Aunkhum, 2 and Wipa Suginta*1 ,2
1Biochemistry-Electrochemistry Research Unit, Suranaree University of Technology, Nakhon Ratchasima, Thailand
2School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon...
Recently there have been reports of room-temperature ferromagnetism induced in carbon compounds, including “Teflon” sheets and “Q-carbon”. In this work, we would like to create room-temperature ferromagnetism with the 1-cage from adamantane; the smallest member of the material called “diamondoid” series (nano-diamond structures). By using chemical vapor deposition (CVD), we prepared the films...
Activated biomass carbon from coconut shell was composited with FeOx and MnOx by hydrothermal method at 160 oC for 18 h. The phase structure, morphology and chemical composition of samples were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Energy dispersive X-ray spectroscopy (EDX). The electrochemical properties of...
Nanoparticles-based drug/gene delivery have been reported for potential therapeutic management of various ocular surface and corneal disorders [Kompella UB, et al., Nanomedicines for back of the eye drug delivery, gene delivery, and imaging. Prog Retin Eye Res. 2013;36:172-98]. In this study, we have examined penetration of mono-dispersed silica nanoparticles stained with Rhodamine B (RhB) and...
Here we developed a fluorescent probe for in vivo colorectal cancer detection using Cy5-doped silica nanoparticles (Cy5-SiNPs) conjugated to monoclonal antibody (mAb) with controlled orientation. Monoclonal antibody specific to anti-epithelial cell adhesion molecule (EpCAM), a cell surface protein overexpressed in colorectal carcinoma, was conjugated on the Cy5-SiNPs coated with protein G...
Atomic structures of graphene like nanomaterials including SiC and BP
Taweesin Rerkhajornnamkul, Tanakorn Osotchan
Materials Science and Engineering Program, and Nanoscience and Nanotechnology Center, Faculty of Science, Mahidol University, Rama VI Road, Phyathai, Bangkok 10400
Abstract:
Honeycomb sheet, graphene like, structure has been interested and the planar structures...
Material surface properties are considered as critical factor for the study of in Vitro cell growth pattern and activities. It provides advantages not only for study of cellular activity but also for biomedical technology such as tissue engineering. Neuron is a typical cell type widely used to examine cell communication, alignment and differentiations. In the present study, a simple pattern...
Cosmeceuticals from natural products or herbal cosmetics has become the most topic of interest in nowadays cosmetic trend, as they are natural, safe and free from all the harmful synthetic chemicals. Many naturally available herbs serves as active ingredients in different uses for skincare, haircare and antioxidant formulation. However, the application of phytochemical extracts in...
The wetting property of materials continues to be studied due to its important applications in many natural and industrial processes. Applying an external voltage affects the contact angle and offers a way to manipulate wettability without changing the chemical composition of the contacting phases. The use of external electric fields to control wettability has promising new applications in...
Two different series of conjugated polymer, poly(m-phenyleneethynylenes) (m-PPEs) containing different amounts of salicylideneaniline moieties (50% and 100%) have been synthesized via a post-functionalization of aniline group on m-PPEs backbone. PPEs are successfully prepared in excellent yield (90-99%) and spectroscopically characterized the structure by $^1$H, $^{13}$C NMR and FTIR...
A ‘consume within’ indicator is important for the perishable foods because the oxygen is the growth factor of aerobic microorganisms in perishable foods. It follows that a useful addition in intelligent packaging technology is a capable diagnostic indicator which allows the real-time monitor of the quality or safety of the foods. A novel UVA-activated, ‘consume within’ indicator ink is based...
A simple electrochemical aptasensor was developed for the detection of glycated albumin (GHSA) using ssDNA aptamer that selectively binds to GHSA as a recognition element. The biotinylated ssDNA aptamer was immobilized on a streptavidin-modified screen-printed carbon electrode (SPCE). The changes of interfacial features of the electrode surface, which were based on the aptamer-GHSA...
Observing Chitooligosaccharide Traveling through a Biological Nanopore of Escheriachia coli
H. Sasimali M. Soysa1, 2 and Wipa Suginta*1 ,2
1Biochemistry-Electrochemistry Research Unit, Suranaree University of Technology, Nakhon Ratchasima, Thailand
2School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand
Tel: +66-44226187; E-mail:...
Pomegranate extracts have been reported as biologically active having desirable properties such as antioxidant, antifungal, anticarcinogenic and anti-inflammatory capabilities. Anthocyanins found in pomegranate fruit have higher antioxidant activity than vitamin-E (α-topcopherol), β-carotene, and ascorbic acid. Although, it shows good biological activity against a variety of target, it easily...
Magnetofection, a site-specific delivery of nucleic acids to cells guided by a magnetic field, has received increasing attention for its great potential on gene therapy. To promote its clinical therapeutic applications, development of safe and effective magnetic nanocarriers is in high demand. Superparamagnetic iron oxide (SPIO) nanoparticles have been clinically proven safe and used as a...
Lead-free xBaZrO3-(0.85-x)BaTiO3-0.15CaTiO3; x = 0.00-0.20 (xBZ) ceramics were successfully prepared using the conventional solid-state reaction method. X-ray diffraction data showed a pure-phase perovskite structure for compositions up to x < 0.200. At room temperature, x-ray diffraction patterns of ceramics with the composition range of 0.00 ≤ x < 0.10 possess tetragonal structure....
Diabetes has been one of the major health issues worldwide and also in Thailand. More importantly, almost half of those with diabetes are undiagnosed. Although various test methods have been developed, the existence of anemia and thalassemia may cause inaccuracy in the diabetes mellitus testing from blood. An alternative biomarker molecule is glycated albumin which directly corresponds to the...
Recently, robotic technology can take place of humans in hazardous environments or manufacturing processes. However, conventional design is not suitable for home use because of rigidity, hardness, and electrical part. In comparison with such conventional robotics, soft robotics are non-rigid robots built from soft deformable materials. They can offer a new and safety approach for home use. To...
Fluorescent chemosensors for Zn(II) are attractive for microscopy and imaging for studying the role of Zn(II) biological in biological system. In this work, we discovered that 8-aminoquinoline containing amino group at alpha-position of the amino acid (1) pendant was effective for Zn(II) fluorescence imaging in plant tissue. In the presence of Zn(II) in aqueous media, ligand 1 exhibits...
Currently, 230 million people worldwide have been affected by diabetes and approximately 366 million people are expected to get diabetes by 2030. Diabetes mellitus is a disease characterized by altered glucose homeostasis, persistent hyperglycemia, chronic inflammation of circulatory system, leading to many complications. The injurious effects of hyperglycemia are separated into macrovascular...
One of the important goals in energy and environmental research is to find novel materials to sequestrate and convert greenhouse gases to useful chemicals. In this study, the well calibrated Density Functional Theory (DFT) is used to study the adsorption of CO2 and H2 in order to investigate possible reaction pathways for CO2 hydrogenation to formic acid over gold supported MCM-22 zeolite...
In this paper, we demonstrate a numerical investigation of an enhanced second-harmonic generation (SHG) effect in a one-dimensional positive-index material/negative-index material (1D-PIM/NIM) structure with nonlinear deep grating. The 1D-PIM/NIM structure composed of common linear PIM layers and NIM layers, whose electric permittivity and magnetic permeability are described by Lorentz...
Derivatives of s-tetrazine (R-T-R’) are theoretical studied to examine the effect of the connected groups (R and R’) to their absorption spectra and their reactivities on Diels-Alder cycloaddition. In case of absorption spectra, all s-tetrazine derivatives have absorption spectrum about 550nm which cause by n→π* transition in the tetrazine ring. Another absorption peak around 300-450nm can...
As a natural-derived phenolic compound, quercetin has promisingly strong antioxidant activities. It is possible to incorporate this compound with active packaging film. However quercetin has poor water-solubility resulting in a limitation of its antioxidant efficacy. Nanotechnology is one of the innovative technologies that can increase surface area, bioactivity, and also improve the...
NS3 protease (NS3pro) is an interesting target for discovering the new potent inhibitors of Dengue virus (DENV). The NS3pro is a serine protease consisting of catalytic triad (HIS51, ASP75, and SER135) and expresses role in the step for post-translational cleavage of substrate. Some derivatives of 8-hydroxyquinoline are found as potent NS3pro inhibitors. Molecular dynamics (MD) simulations...
Biosensing with allosteric nano-biocatalysts:
A reductase subunit of a bacterial hydroxylase as molecular example
Somjai Theanponkrang,1 Jeerus Sucharitakul,2 Pimchai Chaiyen,3 Wipa Suginta1 and Albert Schulte1
1Biochemistry – Electrochemistry Research Unit & Center of Excellence in Advanced Functional Materials
School of Chemistry, Suranaree University of Technology, Nakhon...
Photoredox catalytic organic reactions promoted with visible light have gained much attention recently, allowing to prepare various organic compounds in good yields and selectivity under mild reaction conditions. In this work, we synthesized three iodo-BODIPY derivatives, I-GB, 3I-GB and I-RB as a photocatalysts for oxidative coupling of thiol to disulfide. I-GB and I-RB...
Recently, carbon prepared from cassava was used as counter electrodes for dye-sensitized solar cell and the efficiency of the solar cell was found to be very high. In this research, carbon from cassava is used as anode electrode in Li-ion battery. The carbon was prepared by carbonizing the dry cassava at various temperatures. The morphology was studied by scanning electron microscopy (SEM)....
Bacterial cellulose (BC) is well known as natural biomaterial exhibiting a broad applications. In this study, in order to obtain the BC with low-cost production, isolation and characterization the newly isolates from the fermented products was carried out by using non-detoxified crude glycerol derived from biodiesel processing as sole carbon source. Based on 16S rRNA, Gluconaceter xylinum...
n-Type nanocrystalline (NC) iron disilicide (FeSi2)/intrinsic (i) ultrananocrystalline diamond/amorphous carbon composite (UNCD/a-C)/p-type Si heterojunctions were successfully prepared by employing pulsed laser deposition (PLD) and coaxial arc plasma deposition (CAPD). Their dark current density-voltage (J-V) curves were measured and analyzed at low temperatures ranging from 300 K to 80 K in...
This research was studied about coating of molybdenum oxide on anodized aluminium plate via electrochemical plating technique apply for ultracapacitor electrodes. Preparation of the samples, aluminium plates with the size of 1X1 cm were anodized at voltage of 6, 12 and 24 volt with the constant electric current at 6 amperes for 10, 20 and 30 minute, respectively. The plate samples were then...
Colloidal chitin-soaked nanoporous carbon nanotube thin films as biocompatible immobilization matrix of amperometric enzyme biosensors with long life-time
Waraporn Rernglit, Wipa Suginta and Albert Schulte
Biochemistry – Electrochemistry Research Unit & Center of Excellence in Advanced Functional Materials
School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima,...
Montelukast sodium (MTL) is leukotriene receptor antagonist indicated for prophylaxis and treatment of asthma and is widely used treatment for systemic and local diseases of the upper respiratory tract. However, MTL has many adverse effects including cough, fever, bronchitis, agitation, aggression, anxiousness, hallucinations, depression, insomnia, restlessness, suicidal ideation and liver...
A novel colorimetric method based on a nanocomposite test strip has been developed to detect arsenic (Asv) in natural waters. The method employs a simple vacuum-driven filtration process in which water samples are filtered through a supporting cellulose membrane doped with MoO42– (or molybdenum blue) in NR3+ nano-dispersion. The nanocomposite membrane was capable of detecting Asv species at...
Silver nanoparticles (AgNPs) has been widely used for commercial products with many applications. An increasing number of commercial products cause risks and exposure of AgNPs effects for human and the environment. Therefore, the measurement of AgNPs in the aquatic environment is important. Dithizone ligand is evaluated as one of the most effective chelating reagents for metal ions because of...
Incorporation of N anion into ZnO crystal has been known to induce structural distortion and can cause dramatic change in its electronic structure. It has been reported that thin films with great variance in crystallinity and electrical properties such as highly crystalline p-type or amorphous high carrier mobility n-type ZnO films can be achieved by particular growth control of N doped ZnO or...
Coal combustion in a coal power plant is a major source causing severe environmental implication such as releasing elemental mercury (Hg0), toxic arsine gas(AsH3), and volatile organic compounds (VOCs) into the atmosphere. In this work, we have investigated transition metal decorated graphene as adsorbent for removal of these pollutants from flue gas using density functional theory calculation...
The issue of contact resistance between graphene and metal contacts is crucial in the development of high-speed graphene devices. However, fabrication-related contamination severely affects the contact resistance in graphene and hence an effective post-fabrication method is needed to resolve this problem. Current-induced cleaning has previously been used successfully to clean the surface of...
Supercapacitors are attracting considerable interest for clean energy storage applications due to their high specific capacitance, fast charging-discharging, long cycle life and non-toxicity. Many attempts have been made to increase performance of electrode materials, one of them is to combined both preferred properties of carbon based nanomaterials which provided high specific surface area...
Abstract
Fish products provide a vital source of essential protein and contain many minerals and vitamins in human nutrition. Unfortunately these products are extremely perishable and can be spoiled rapidly at an unsuitable storage. Diagnostic packaging plays a key role for real time monitoring quality and safety of products, by detecting volatile compounds which existed within...
This research is aimed to study the effect of zinc oxide (ZnO) and titanium dioxide (TiO2) on mechanical and antibacterial properties of PS/NBR electrospun fibers. 15 wt% of polystyrene (PS) blended with nitrile rubber (NBR) at 50:50 w/w is dissolved in tetrahydrofuran prepared PS and NBR solution. ZnO and TiO2 are added into PS/NBR solution at 1.0, 2.0 and 3.0 wt%. The addition of 2.0 wt% of...
Reaction mechanism of selective catalytic reduction (SCR) of NO by NH3 on the clean and Brønsted acid surfaces of Ru-deoped CeO2(111) were investigated using density fuctionl theory calculation corrected by on-stie Coulomb interactions (DFT+U). The calculations were performed by Viena Ab initio Program Package (VASP). The proposed reaction mechanism on the clean surface consists of two...
Nowadays, solar cells based on CH3NH3PbX3 (when X is halogen) perovskite materials have been intensively studied due to their broad absorption spectrum, long charge carrier lifetime and long carrier diffusion length. However, from previous reports, halogen in perovskite structure typically affects the properties of CH3NH3PbI3–yXy active layers in perovskite solar cells. In this study, we then...
Semi-conductive yarns have been developed for wearable gas sensor applications. Three types of semi-conductive yarns based polyester, rayon and cotton fiber are prepared by dip coating process in polyaniline solutions. The structure and surface morphology of semi-conductive yarns are analyzed by fourier transformed infrared spectroscopy and scanning electron microscope. The results showed that...
In this study, a series of CuO-ZnO-ZrO2-SiO2 catalysts were prepared by co-precipitation of Cu, Zn and Zr precursors with dispersed colloidal silica nanoparticles. The effect of silica content (0–5 wt%) on the physicochemical properties of the resulting catalysts as well as their catalytic activity in CO2 hydrogenation were investigated. The catalysts were characterized by thermal...
We designed and developed a highly sensitive lateral flow immunoassay (LFIA) for double-antigen detection of influenza A. The sensitivity enhancement of the assay was achieved by using two-layered gold nanoparticles in combination with double-target detection format. First, gold nanoparticles were conjugated to monoclonal antibodies (mAb) specific to the two most abundant influenza A proteins,...
Hydroxyapatite (HA) powder was prepared from cockle shells by co-precipitated with phosphate solution at Ca/P ratio 1.67. Green bodies were formed to disk shape (0.5 cm high x1.5 cm diameter) by dry pressing method with hydraulic machine, sintered at temperature of 1200, 1250 and 1300 $^{\circ}$C for 2 h in electric furnace and sintering process was carried out by setting a heating ramp rate...
Polycrystalline Ca12Al14O33 (C12A7: O-) was synthesized by conventional solid state reaction method and was calcined/sintered at 1300˚C. The Mg powder was used to reduce oxygen inside of nano-cage to form free electron in the cage for enhancing the electrical and optical properties of C12A7 cement compound. The crystal structure of the C12A7:O- and Mg-reducing C12A7 were characterized by X-ray...
We report a method to fabricate gold disc array pattern on indium tin oxide (ITO) glass by incorporation of nanosphere lithography and plasma etching technique. In the process, hexagonal close-packed polystyrene (PS) spheres were served as mask for blocking an interaction of oxygen plasma and indium tin oxide surface. Topographic images and C-AFM current mappings demonstrated different...
Surface enhance Raman scattering (SERS) has received a great interest as a powerful tool for enhancing the Raman characteristic peaks of molecules. For commercial purpose, SERS substrate is practically required to accomplish all four features, which are high sensitivity, reproducibility, uniformity and ability to provide stable Raman signal. There are a few works of developed SERS substrates...
Cu-doped BiFeO3 thin film was deposited on Pt/Ti/SiO2 substrates by using simple spin coating technique. The structure, electrochemical properties and ferromagnetic/ferroelectric properties of the thin film were studied with the increase Cu-doped concentration. The prepared thin films were characterized by X-ray diffraction, Grazing incidence x-ray diffraction (GIXRD) and scanning electron...
Two dimensional graphene-liked materials, so-called MXenes, have been discovered recently. MXenes are layers of transition metal carbide and nitride compounds. According to their large surface area and their distinctive properties, MXenes are promising materials for many applications such as energy storage, supercapacitor, gas storage and thermoelectric applications. This work investigated gas...
Green synthesis, a low cost and eco-friendly method, has received much attention as an alternative for the development of inorganic nanoparticles (NPs) such as metals, metal oxides, and metal chlorides. Several applications of silver chloride nanoparticles (AgCl-NPs) have been widely recognized, including catalytic material, ionic conductor material and antibacterial agent. A synthesis method...
Highly-sensitive room-temperature operable gas sensors based on photocatalytic activity of Ag-loaded ZnO nanostructures are demonstrated as a possible candidate for sub-ppm acetone detection. Characterizations indicate that Ag nanoparticles are well deposited on the surface of hierarchical flowerlike ZnO nanostructures. To utilize the room-temperature operable gas sensor, Ag-loaded ZnO...
This article focuses on the investigation of hydrophilic property and photocatalytic activity of synthetic rutile-based thin films prepared by conventional dip coating method. The synthetic rutile was prepared by chloride leaching process for purification of synthetic rutile from mineral ores and was coated on glass substrate with binder for several times to reach designated thickness. ...
In the present study, nanocrystalline n-type FeSi2/p-type Si heterojunctions were fabricated by using pulsed laser deposition technique at room temperature. Their dark current density-voltage (J-V) curves were measured at room temperature. The possible carrier transportation mechanisms were investigated by analyzing the forward J-V curves. The present heterojunctions showed good rectifying...
Visualization of subcellular levels is always difficult to be achieved by conventional fluorescence microscopy due to the diffraction limit of light. Stimulated Emission Depletion (STED) is a super-resolution microscopy that can improve the spatial resolution to below 70 nm. Herein, we demonstrated cellular localization of nanoparticles in A549, human lung epithelial cell line by using a STED...
Carbon dioxide and methane have been utilized as reactant gases to produce hydrogen and carbon monoxide through dry reforming reaction. However, the main problem is catalyst deactivation by coke formation. In order to solve this problem, nickel-carbon nanotubes (Ni-CNTs) composite material with a unique structure of Ni on the tips of CNTs used as catalyst could prolong the catalyst lifetime...
Several adhesives with different rheology behavior were used to investigate the viscosity effect on time-pressure and microdot-valve dispensing systems. For time-pressure dispensing system, epoxy adhesive with viscosity of 400,000 cps showed linearly increase of dot volume as increasing pressure between 4 to 7 bar. In this operating region, the dot size increases as increasing needle diameter...
Konjac glucomannan is a polysaccharide extracted from the Amorphophallus konjac K.Koch plant. It is often used as food additives due to their low toxicity, biodegradability and low calories. The unique properties of konjac glucomannan is a prebiotic, a non-digestible food, which cannot be digested and absorbed in human stomachs and small intestines. Therefore, it is fermented in the large...
Low Cost and Reliable Surface Plasmon Resonance-Based Detection System for Liquid Propane Gas
1 Saima Amjad, 1 G. Louis Hornyak and 2,3 Waleed S. Mohammed
1 Center of Excellence in Nanotechnology (COEN), Asian Institute of Technology, Pathumthani 12120 Thailand
2 Bangkok University Center of research in Optoelectronics, Communications and Control Systems (CROCCS), Bangkok University,...
Magnetic polymeric nanoparticle (MPNP) has been used widely as a solid support for biomolecules in biomedical applications. Because it is convenient to control by applying external magnetic field and easy to surface functionalize. In this work, magnetic capture hybridization – polymerase chain reaction (MCH-PCR) was developed for detection of S. Typhimurium contaminated in drinking water and...
Nickel doped CuFeO2 were synthesized by using sol-gel method and then heat annealing was performed into two steps. The first annealing was executed at 500C in air to transform the dried gels into spinel oxide phases and the second one was done at 800C in argon for the formation of delafossite oxide phase. The chemical and crystal structure and morphology of dried gels and annealed powders...
Magneticfield–promoted cleaner production of small alcohols and hydrocarbons from CO2 over Cu-ZnO/ZrO2and Fe/MCM-41 catalysts
Metta Chareonpanich1,2,*,Waleeporn Donphai 1,2, Sirapassorn Kiatphuengporn3, Jumras Limtrakul2,4
1KU-Green Catalysts Group, Department of Chemical Engineering, Faculty of Engineering,
Kasetsart University, Bangkok 10900, Thailand
2NANOTEC Center for Nanoscale...
Silver nanoparticles (AgNPs) are an important class of nanomaterials, largely due to their outstanding antibacterial properties. However, little is known about their toxicity and environmental impacts. In this study, we report that AgNPs lead to growth inhibition and oxidative stress in gram negative bacteria; Escherichia coli and gram positive bacteria; Staphylococcus aureus....
The complete reaction mechanisms of elementary mercury (Hg) adsorption and oxidation on halogenated activated carbon (AC) models have been demonstrated for the first time using density functional theory (DFT) calculations. Two different halogenated AC models, namely X-AC and X-AC-X (X=Cl, Br, I), were used to compare the effect of degrees of halogenation on the reaction reactivity. The...
This work presents a new microfluidic device with integrated graphene-based
electrochemical electrodes for in-channel amperometric detection. Graphene-based
working and counter electrodes were fabricated by screen printing graphene paste on
a glass substrate followed by screen printing of silver/silver chloride (Ag/AgCl)
reference electrode. The screen-printed substrate was then bonded to...
ABSTRACT
Surface modification methods are used in several industries as biomedical, textiles, microelectronics, bioprocessing, and food packaging. Most commercial polymers surface are inert and hydrophobic in nature, they must be modified or treated prior to covalent attachment with desired compounds on their surface. Surface modification technology as UV irradiation has been used to...
Fabrication of tetrahydrocurcumin (THC) nanoparticles encapsulated in chitosan (CTS) was achieved by a two-step method. THC nanoparticles were produced by rapid expansion of subcritical solutions of THC in a mixture of carbon dioxide and ethanol (1:1, w/w) with pre-expansion temperature and pressure of 80 °C and 276 bar, respectively. The aim of this study was to investigate the encapsulation...
The enhancement of luminescence properties of Sm3+ in tellurite glasses containing silver nanoparticles (AgNPs) have been investigated. The glass samples with chemical composition of (53.5-x(TeO2 : 10ZnO : 35BaO : 1.5Sm2O3 : xAgNPs (where x= 0.00, 0.01, 0.02, 0.03, 0.04, and 0.05 % by mol) were prepare by the conventional melt quenching technique. The results show that the density and molar...
Metal nanoparticles, especially Au and Ag nanoparticles, have well known that exhibit the localized surface plasmon resonances (LSPR). This article presents the optical property named extinction spectra of pure noble metal (gold and silver) nanorods and silica shell coated gold nanorod embedded in organic medium with fixed dielectric constant were simulated using the quasi-static approximation...
Chaiwat Phrompeta, Chaval Sriwongb, Chesta Ruttanapuna,*and Santi Maensiric
a Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok, 10520, Thailand
bDepartment of Chemistry, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Chalongkrung Road, Ladkrabang, Bangkok, 10520,...
Sildenafil is a phosphodiesterase-5 (PDE5) inhibitor approved for the treatment of pulmonary arterial hypertension; commercially available in oral and intravenous forms. The major obstacles in developing a new dosage form of sildenafil are its limited solubility and stability. To develop an alternative, pulmonary dosage form, these problems must be overcome. The objectives of this study are to...
In this study, waste poly(ethylene terephthalate) (PET) bottle was depolymerized using excess ethylene glycol (EG) in the presence of zinc acetate as a catalyst. It was found that the reacted products consist mainly of bis-2-hydroxy ethylene terephthalate (BHET) monomer. Poly(ethylene terephthalate)-poly(lactic acid) (PET-PLA) copolymers were synthesized by the reaction of BHET with L-lactic...
For volatile organic compounds (VOCs) abatement, a series of high surface area cerium-cobalt mixed oxide nanocatalysts with different cerium/cobalt ratios were prepared via a surfactant assisted-templating precipitation method using cetyltrimethylammonium bromide (CTAB) as a surfactant. The obtained catalysts were characterized by different techniques including X-ray diffraction (XRD),...
Improvement of Pt-based catalysts for direct methanol fuel cell applications based on increasing surface area and changing chemical composition of the catalysts have been studied intensively [1,2]. Moreover, there are few studies [3,4], which use hollow trimetallic Co/Au/Pt nanoparticles (Co/Au/Pt NPs) to catalyze methanol oxidation. A comparison of the catalytic performances for the methanol...
The demands of a renewable energy source have been of wide interest. Hydrogen is attractive as a clean fuel source. A photoelectrochemical (PEC) cell is a promising hydrogen generation technology through the photoelectrolysis of water using solar energy. ZnO material is applied to PEC cells because ZnO has a favorable band edge position that straddles the redox potential of photoelectrolysis...
Abstract will be added by the contribution
To be added
Hyperspectral imaging is a spatio-spectral imaging technique that is capable of acquiring the electromagnetic spectrum at each spatial location in an imaging field of view. Since certain objects leave unique spectral profiles in the electromagnetic spectrum, hyperspectral imaging has gained in importance in a wide range of applications including material detection and identification. This work...
In this work, we present a new electrochemical DNA biosensor using screen-printed
graphene electrode and Hoechst 33258 intercalator for detection of Aspergillus flavas
DNA that produces aflatoxin B1. The principle of detection is based on suppression
of activity of redox molecules (H33258), which will be intercalated between A-T
based of hybridized DNA of Aspergillus flavas that produces...
In this work, flame-made SnO2 nanoparticles were systematically studied by doping with 0.1−2 wt % lanthanum (La) and loading with 0.1−10 wt% electrolytically exfoliated graphene for low detection of VOCs gases including acetone (C3H6O) and ethanol (C2H5OH) gases occurred in human breathe. The sensing films were prepared by a spin-coating technique on Au/Al2O3substrates and evaluated to 6-400...
Nitric oxide (NO), one of the pollutant gases released from exhaust and industrial process, plays a major role in undesired effects such as greenhouse effect. Commercial catalysts for NH3-selective catalytic reduction (SCR) of NO are extensively used in removal of NO. However, these catalysts may give some drawbacks including toxicity at high temperature range. An alternative...
To be added
Silver nanoparticles (AgNPs) have distinctive physicochemical properties that make them attractive in a variety of applications. These uses are rapidly expanding. Thus, the exposure of human and other organisms, especially aquatic organisms, to AgNPs is obviously increased. In order to gain new insights into the toxicity of silver nanoparticles, the study of cardiovascular effects was...
In this paper, we propose spectroscopy system, which use Complementary metal–oxide–semiconductor (CMOS) image sensor as two dimensional detectors, for studying in undergraduate laboratory. The goal of this system is to make students understand internal structure of commercial spectrometer and characteristic of light spectrum. Light with various wavelengths propagated via variable slit, which...
The structural and electronic properties of zinc phthalocyanine (ZnPc) monolayer were investigated using first-principles calculations. The calculated bond lengths and bond angles were found to be in good agreement with the previous works. The spin-polarized density of state (DOS) for ZnPc monolayer was presented. Furthermore, the effects of Sn intercalation on structural and electronic...
Cisplatin (CP) is an essential anticancer drug, according to the World Health Organization's List of Essential Medicines. The drug has a number of side-effects, such as nephrotoxicity, neurotoxicity, ototoxicity; and can be the causes of hemolytic anemia, electrolyte disturbance, nausea, and vomiting. Cisplatin resistance is problematic for treatment of many cancers.
Curcumin (CMN) is a...
A new series of fluorescent sensors JP (J2P, J3P and J4P) was successfully synthesized via a simple Schiff base reaction by linking a fluorophore using 8-hydroxyjulolidinyl aldehyde 1 with di-(2-picolyl)amine (DPA) derivatives 2. The aldehyde 1 has been prepared by two important steps which are substitution of m-Anisidine with 1-bromo-3-chloropropane and Vilsmeier–Haack...
Lupinifolin is a prenylated flavonoid isolated from several medicinal plants, such as Myriopteron extensum, Eriosema chinense, Albizia myriophylla and Erythrina fusca. It is also reported to be a major compound of Derris reticulata. There are several lines of evidence demonstrating that lupinifolin exerts antimicrobial activities. However, due to its very insoluble property, poor...
Our research focuses on the development of the synthesis of poly(p-phenylene ethynylene)s, PPEs via the Sonogashira coupling reaction using palladium supported on calcium carbonate as heterogeneous catalyst. We screened different palladium catalysts, bases and solvent to determine the optimal condition. The optimized study reveals that the use of Pd/CaCO$_3$ in diisopropylamine as a base in...
Ni-doped TNTs with a nominal composition of NixTi3-xO7 (Na0.96H1.04∙3.42H2O) (where x = 0, 0.05 and 0.1) were synthesized by hydrothermal route at temperature of 130 °C for 24 h. The synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (SEM), UV-vis spectroscopy and vibrating sample magnetometry (VSM). Magnetic measurements by VSM indicate that...
The effect of hydroxyapatite (HAp) nanoparticles on plant growth has been studied in recent years due to the chemical composition of the material which consists of calcium and phosphate. However, little has been done with regards to the effect of nanoparticles on callus. In this study, the effects of HAp on callus induction and morphology were investigated. The production of embryogenesis...
Although hydroxyapatite nanoparticle was reported to have potential for enhancing plant growth, its effect on rice had never been investigated. The objective of the present study was to investigate the effects of hydroxyapatite nanoparticles (HAp-NPs) at concentrations of 0, 10, 25, 50, 100, 500, 1,000 and 2,000 µg/ml on seed germination and seedlings of rice (Oryza sativa L.). Assessments of...
Periodontal disease is an infection of polymicrobrial around tooth-supporting tissues. The aim of this study is to assess recent therapeutic strategies in which biocompatible nanoparticles are used. The active compounds were extracted from Thai herbal and entrapped in calcium alginate beads prepared with sodium alginate by the ionotropic gelation method using calcium chloride as a crosslinking...
The optical and magneto-optical called Faraday rotation of composites containing isolated Fe3O4 (magnetite) nanorod particles are presented in the wavelength range from 300 – 700 nm. The results were obtained by using the discrete dipole approximation (DDA) method. The composite materials are constructed by combining Fe3O4 nanorod particles and the material with fixed dielectric constant of...
Feasible interactions between metallic single-walled carbon nanotubes (SWCNTs) and ethanol gases were carried out via using theory of first principles based on DFT. Also, the vdW correction and spin polarized were included in this account. The equilibrium position, adsorption energy, charge transfer, density of states, and electronic band structure of ethanol rearranged inside and outside...
Thermal analysis was used to study epoxy crosslink occurring during the curing process by observing lower thermal energy amount required for phase change which can be determined by differential scanning calorimetry (DSC). Dual cured epoxy adhesive was done by firstly UV light exposure then heat at about transition temperature. The DSC results indicated that epoxy adhesive exhibited curing...
TiO2-doped WO3 coated on CA were prepared by microwave-assisted sol-gel method. The calcined at the temperature of 500 °C for 2 h with a heating rate of 10 °C/min were characterized by XRD, EDS and SEM. The photocatalytic and an antibacterial activity of TiO2-doped WO3 coated on CA were investigated by means of degradation of a MB solution and against the bacteria E.coli respectively. The...
Concern against short-term and long-term adverse health effect of synthetic pesticide, both to the human and environment has encouraged the development of bio-pesticide. Eugenol as major component of Clove, Syzygium aromaticum, has been proofed as potential biopesticide in various study (Bakkali et al. 2008; Burt 2004; Deans & Ritchie 1987). However, evaporation and photosensitive properties...
In this research, SnO2 nanoparticles doped with 0.1-2 wt% rhodium (Rh) were synthesized by flame spray pyrolysis (FSP) and systematically investigated for H2-sensing applications. From X-ray and electron microscopic characterizations, SnO2 nanostructures exhibited spheroidal morphology with polycrystalline tetragonal SnO2 phase and Rh might form solid solution with SnO2 lattice. The sensing...
