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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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
Recently, nanofibers attract much interest not only in apparel industry, but also information technology, bio-medical, or environmental fields. In the presentation, I will introduce fabrication and characteristics of highly aligned carbon nanotube (CNT) nanofiber sheets [1-4]. The multiwalled CNTs (MWCNTs) were deposited by chloride-assisted chemical vapor deposition. The length of obtained...
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...
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...
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...
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,...
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 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...
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...
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....
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...
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...
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...
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...
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...
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...
Dye-sensitized solar cells (DSSCs) are a leading contender for low-cost solar energy generation. The highest efficiency of DSSC is from platinum(Pt) counter electrode (14.1%), however platinum is very expensive and there are other materials that can use as counter electrode such as conductive polymer, carbon nanotube and other carbon form. In this work we use diamondoids (nano powder of...
This study was aimed to determine the effect of methane gas concentration on the voltage response of tin oxide (SnO) film. The sensing circuit of the tin oxide film was interfaced to a laptop computer throug an arduino microcontroller for data acquisition. Real time data table and graph can be visualized on the laptop screen during the gas sensing process.
The sensor was enclosed in an...
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...
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:...
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...
Abstract will be added by the contribution
