This research studied the optimal conditions for crafting fiber of PVA / CS / SW by electrospinning techniques. The study was divided into two parts. first, This crafting fibers PVA/CS by spinning PVA/CS ratios of 50/50, 60/40, 70/30, 80/20 and 90/10 at constant feed rate 0.3 ml/h, 10 cm and 15 cm spinning distance at 7 and 8 kV voltage respectively. Part Two, This crafting fibers PVA/CS/SW...
In this work, a nonlinear transfer matrix method, which is simple, fast, and, accurate numerical method for nonlinear optical phenomenon modeling, has been used to develop a theoretical model of a third-harmonic generation with nondepleted pump in one-dimensional metal-dielectric photonic band-gap structures for oblique incidence. The advantage of this formalism is considering...
By making use of advanced technique of the near-field Talbot effect, we design a novel spectrometer. Our method provides a compact and portable spectrometer according to the characteristic of the Talbot effect. Here, we propose the idea with the simulations done with reasonable values. With vibration and temperature adjustments, the high resolution over a range of a few nanometers can be obtained.
When ferrofluid is in a presence of external magnetic field, different peak patterns are formed depending upon shape and magnetic field strength of permanent magnets. In this study, 2 dimensional magnetic field distribution from different magnet shapes were mapped and compared with the simulated magnetic field distribution in order to use magnetic field strength at particular location to...
Carbon nanotubes (CNTs) and zinc oxide (ZnO) are one of the most popular materials for gas sensing applications due to its their high electron transfer rate, large specific surface area, promising electronic and structure properties. However, gas sensor based on ZnO nanocluster decorated CNTs is still limited. In this work, we have simulated the models the formation of ZnO nanocluster...
Atmospheric-pressure plasma (APAP) is a promising non-thermal technology for microbial control and prevention minimally affecting quality of foods. Effect of APAP jet on the growth of bread molds, including Aspergillus sp., Rhizopus sp., and Penicillium sp., isolated from white bread were investigated. The molds were isolated, verified, cultured to fully grown on potato dextrose agar (PDA),...
Antibacterial activity of silver nanoparticles (AgNPs) has been attracted many interests in several applications such as food packaging, medical devices, wastewater treatment and textile fabrics. In this work, antifungal activity of AgNPs for natural rubber latex has been investigated. A technique of green AgNPs synthesis route has been presented based on aqueous silver nitrate (AgNO$_3$) and...
The aim of this study was to understand elemental concentration distribution in local longan leaves for revealing whether and how the plant was affected by the environment or agricultural operation since longan trees were normally heavily sprayed with fertilizer and pesticide and chemical residues might be long lasted on the leaves. The analysis was carried out using the MeV-microbeam particle...
Titanium dioxide (TiO2), Titanium nitride (TiN) and Titanium oxynitride (TiNO) are considered as promising material for the medical biology applications. In this study, The properties of biocompatibility on TiO2, TiN and TiNO thin film deposited by dc reactive magnetron sputtering on glass substrate were investigated. The material characterized techniques such as x-ray diffraction (XRD),...
The Co75Ag25 films were deposited on Co, Ni, Cr and Al under-layers and polyimide substrate by RF-sputtering. All of films exhibited soft perpendicular anisotropy with HCP-Co (201), (220) and FCC-Ag (111), (200) structures. The Co75Ag25 film on Co under-layer showed regular grain distribution and maximum grain size of about 32.2 nm whereas the film on Ni under-layer showed minimum grain size...
Perovskite Mn-doped CaCu$_3$Ti$_4$O$_{12}$ (CCTO) thin films were prepared by a sol-gel spinning method. The films were deposited one layer at a time and each layer was annealed at 800 $^o$C for an hour. Mn doping concentration in the films was varied in the range of 0-4 wt%. As the Mn doping concentration increases, the crystallite size decreases along with decreasing in the measured FWHM of...
SEM technique was assisted to selected the best condition of 5 wt% Ag doped WO3 nanofiber which synthesized by electrospinning method and calcined at 550 ๐C for 2 hours then were investigated the characteristic via X-ray diffraction, Raman spectroscopy, photoluminescence, UV-visible, FTIR and TEM technique. The results show that is product of orthorhombic Ag-WO3 nanofiber with 60 nm diameter...
Charges mobility is the key factor to determine the performance of bulk heterojunction organic solar cells. Many relevance approaches have been utilized to investigated the charges mobility. Charge extraction by linearly increasing voltage (CELIV) is one of the famous technique. However, the excitation light source is limited to the commercial short pulse laser or LED which is rather high...
Charge Mobility of Organic Solar Cells using Low Cost Pulsed Laser for photo-CELIV
Sorawit Changsalak1, Wachirawit Srisa-nga1, and Yingyot Infahsaeng1*
1Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang, Pathum-Thani, Thailand
*E-mail: yingyot.infahsaeng@gmail.com
Abstract
Charges mobility is the key factor to determine the performance...
Molecular dynamics simulations were employed to investigate the cholesterol concentration effect on the physical properties of niosome bilayers such as area per molecule, membrane thickness, hydration structure, fluidity and diffusion coefficient. All simulations were carried out at a constant temperature of 300 K by using Gromacs package 5.1.2. We found that increase in cholesterol numbers to...
We investigated quantum corrections to classical nuclear simulations of the $\pi^{+}({^3}He,ppn)\pi^{+}$ reactions.These simulations are often used to describe nuclear reactions which lead to many final states.The ratio of the quantum multiple scattering to the classical cross section for the same process is used as a correction to the classical model calculation.The single,double,triple and...
Molten droplets are probably generated in a fusion tokamak through splashing of molten layers of plasma-facing surfaces, during transient events such as disruptions and edge localized modes (ELMs) at which surface melting is unavoidable, and melting of solid wall-material debris, i.e. dust/flakes, by heat flux of an energetic fusion plasma. Molten droplets are allowed if plasma-facing...
Light interferometry is one of great non-destructive tools for making a surface profile image of materials. Because of phase difference analyzing method as a Fast Fourier transform (FFT), 3D surface profile image can be constructed from a speckle interferogram of He-Ne laser.[ref] However, 3D image of a surface coated with micro-scale transparent layer cannot be structure by using He-Ne laser...
Transparent conducting thin film is an important layer determining the efficiency of optoelectronic devices. Materials shown the wide-range transparency together with high conductivity are of interest. Among materials providing such optical and electrical properties, metal-doped ZnO is a promising material that gain tremendous attractions. In this work, highly transparent and highly conductive...
The present project had been a collaborative project fully supported from Singha Beverage Company to invent the novel equipment that could both determine dead and living cells with the rapid real-time analysis for on-site operation and most importantly offer the prospect of effective separation of dead vs. live cells. We employed the principle of cell polarizations in AC non-uniform electric...
We investigated superhydrophobic carbon nanoparticles (CNP) films coating on glass slides. The films were deposited by candle soot layers from combustion flames. Contact angle for water droplets increase dramatically from 44.8±4.7˚ for clean glass slides to 157.6±6.6˚ when the glass slides coated by CNP films for 10 seconds. The contact angle of water droplets on CNP samples decreases with...
Design and performance of a laser-based weed control system
Sirinun Sirikunkiti and Amarin Ratanavis
Department of Industrial Physics and Medical Instrumentation, Faculty of Applied Science, Lasers and Optics Research Center (LANDOS), Science and Technology Research Institute, King Mongkut’s University of Technology North Bangkok, Thailand
This paper investigates the influence of CO2 laser...
The purpose of this research was to develop concept and retention rate on energy conservation. The activities included simple and easy experiments. This experiments looks at energy transformation from potential to kinetic energy. The samples were 30 students which were purposively selected from grade 10 in the second semester of the 2016 academic year. The research tools consisted of learning...
We have fabricated dye sensitized solar cells and improved the efficiency of the cells by doping aluminum (Al) in anodization process during synthesizing TiO2 nanotubes (Titania nanotubes). We have studied the microstructure of titania by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Atomic Force Microscopy (AFM), optical property by UV-visible spectroscopy, and the effect of...
The purposes of this research were: to construct packages of operations on buoyancy and the involvement of Newton’s third law, to enhance achievement score of students on buoyancy and the involvement of Newton’s third law , to enhance experimental skills on buoyancy and the involvement of Newton’s third law and to evaluate students’ attitude towards the packages of operations on buoyancy and...
This research is designed to determine the efficacy of DBD plasma to reduce the microbial contamination of pepper and sesame powder. The AC high voltage power supply was used with voltage up to ±20 kV and the frequency of 5.5 kHz is applied to DBD. The gap of DBD electrodes was set at 5 mm. In raw initial samples, The total aerobic count of pepper (Piper nigrum) was found at quite high...
The neutron imaging is a powerful non-destructive technique to investigate the internal structure and provides the information which is different from the conventional X-ray/Gamma radiography. By reconstruction of the obtained 2-dimentional images from the taken different angle around the specimen, the tomographic image can be obtained and it can provide the information in more detail. The...
In practice pronunciation, volume and frequency in the course of karaoke. Student in classroom training in class hour cannot be trained to look for suitable projects. The project looks to fit the mouth to get the frequency and volume of demand at home because there is no volume and frequency of the sound to the uninitiated.
Sing sharp leach program is able to tell the minister that the volume...
The purpose of this work was to develop technical analysis of X-ray fluorescence (XRF) and compare with technical neutron activation analysis (NAA). In this study, three samples of tin oxide (SnO) were used to be the reference materials. The results from NAA show the content of tin were 79.39, 77.48 and 73.35 wt%. While the XRF analysis in unnormalized mode show the content of tin were 68.77,...
Diamond-like carbon thin films were prepared by RF magnetron sputtering. Different deposition conditions were experimented. The main variable parameters were the argon flow rate, RF power and bias voltage. The carbon films were characterized by photoemission spectroscopy and soft X-ray absorption spectroscopy. In this report, the results from the measurements will be reported and discussed.
The Thick lenses was developed and fabricated by DIY (Do it yourself) Low Cost process that applied teaching the focal length for parallel light rays passing through lenses in either direction in Physics, to increase good achievement and attitude of students. This instrument kit was made form transparent acrylic Perspex thickness of 2 mm. It was cut rectangle form an area the size 2x15 cm2 and...
Dielectric Barriers Discharge (DBD) plasmas is a cold plasma that can be generated in atmospheric pressure, thus allows it to be used on various applications. In this work, DBD plasmas will be used for treating egg shell. The results in terms of surface modification will be presented.
The effect of various annealing treatments on the structure properties of crystalline silicon (c-Si) produced by the inverted aluminum induced crystallization of amorphous silicon (a-Si) films was studied. The surface morphology and grain size of c-Si films were observed by optical microscope, SEM and AFM. X-ray diffraction and Raman spectroscopy were used to study quantity of Si...
CuO nanoparticles (CuO NPs) were used as a barrier layer in ZnO dye-sensitized solar cells (DSSCs) to obtain high power conversion efficiency. The barrier layer was investigated in terms of the size of CuO NPs by varying power of pulsed Nd:YAG (1064 nm) laser ablation. Morphological and optical properties of CuO NPs were characterized by transmission electron microscopy (TEM), UV-visible...
Oil palm has widely been grown in Southern Thailand. Nowadays, it has been become an important economic plant. The oil from different varieties are used for bio-energy and industrial uses and also for human consumption. However, production of young oil palm trees is still limited and the plants are expensive because it takes up to 8 months for germination to occur and the germination...
Molecular dynamics simulations of niosome bilayer were performed to investigate its physical properties such as area per lipid, volume, thickness, lateral diffusion coefficient, and lipid structural order. The physical properties were computed in the membrane tension ranging from 0 to 15 dyn/cm. All simulations were carried out at the constant temperature of 300 K by using Gromacs package...
In this study, different surface morphologies of MnO$_2$ (rod, wire, urchin and tube-like MnO$_2$) with an $\alpha$-phase crystalline structure were synthesized via a hydrothermal process by adding various reagents. The crystalline structure and morphology were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In addition, the electrochemical properties...
Electrical cell lysis is an important technique in obtaining intracellular components for further analysis. In this research, three different array of shapes; comb, triangle, rectangle; of indium tin oxide (ITO) were fabricated for cell lysis in microfluidic systems. Paramecium sp. cells were used in visualizing cell disruption due to the application of 12 V$_\text{p-p}$ AC voltage between...
The Zr-Ti-W metal alloy thin films were fabricated by co-sputtering technique at room temperature. The effect of sputtering power on the thin film properties was investigated by varied power as 100, 200 and 300 W at the constant deposition time. The thickness and surface morphology of thin films were characterized by field-emission scanning electron microscope (FE-SEM) and atomic force...
This research presents a study of aggregation of colloidal gold nanoparticles using 400 nm diameter gold nanoparticles mixed with a surfactant (Plantacare 2000) at various concentrations. When observed under a microscope, we found that the nanoparticles aggregated to form nearly spherical clusters at the beginning of the formation, and then sedimented to the bottom of the container. These...
Titanium dioxide (TiO$_2$) nanostructures were prepared by microwave assisted and varying time. The morphology of TiO$_2$ nanostructures were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical and gas sensing properties. SEM images revealed nanoparticles cluster of prepared products. XRD patterns showed anatase phase of TiO2 with peak of (101), (004), (200),...
A TiO$_2$ compact layer or blocking layer plays a crucial role in a hybrid organic-inorganic lead halide perovskite solar cells because it can prevent the carrier recombination at the interface of fluorine-doped tin oxide (FTO) and perovskite layers. There are many methods to fabricate this layer such as spray pyrolysis or spin-coating which is solution-based synthesis that is difficult to...
Preparation and surface modification of Polysulfone (PSF) membranes by DC plasma were conducted in order to improve membrane hydrophilicity and gas permeation efficiency. Different type of oxygen (O$_2$), Argon (Ar), Argon (Ar)/oxygen (O$_2$) mixture plasma and plasma sequence of O$_2$ and Ar gasses were employed to modify the membrane surfaces. Characteristics of membrane samples were...
Titanium nitride coatings have been used very successfully in a variety of applications because of their excellent properties, such as the high hardness meaning good wear resistance and also used for covering medical implants. Hydroxyapatite is a bioactive ceramic that contributes to the restoration of bone tissue, which together with titanium nitride may contribute to obtaining a superior...
In this work, carbon sphere films at different growth temperature of 180, 200 and 220°C were synthesized by 10 hrs hydrothermal process from glucose to apply for supercapacitor electrode. The carbon sphere films were washed and filled by DI water for several times. Finally, they were kept it in an oven at 80°C to dry. Crystal structure and film morphology were analyzed by X-ray diffraction,...
First-principles calculations based on density functional theory (DFT) have been performed to study the adsorption of molecular H$_2$ on the graphene-like material C$_2$N. The possible adsorption sites on top of bonds, on carbon atom and nitrogen atom and the center of C-C hexagon and the C-N hexagon are considered. The adsorption energies for each site are calculated and are found to be in...
Fission product behaviors of Cs, a major element released in a severe nuclear accident, still remain unclear. The question frequently addressed is whether Cs released will be in the form of CsMoO$_4$ or CsOH. This is a challenging issue since it has been demonstrated that the reaction between CsMoO$_4$ and water leading to CsOH production is thermodynamically favored. The present research aims...
A flipped classroom is an instructional strategy and a type of blended learning that reverses the traditional learning environment. Instead of spending entire periods watching a lecture, students watch lectures online outside of class time and use class time to do activities. The 35 pre-engineer students had been taught by flipped classroom on the topics of work and energy in Physics course....
An important aspect of musical structure that allows discrimination between different sounds is the timbral characteristic. Although, there has been significant interest in the application of fractal theory as a tool for the analysis of musical structure, no such study has been done to investigate timbre on physical modeling sound synthesis. In this paper, we examine the changes of timbre and...
The specific activities of natural radionuclides ($^4$$^0$K, $^2$$^2$$^6$Ra and $^2$$^3$$^2$Th) in 50 surface beach sand samples collected from Bangsaen beach in Chonburi province in the easthern region of Thailand, were measured and evaluated. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system in the special laboratory at...
The purpose of this study was to evaluate the radionuclide concentrations of London blue topaz after fast neutron irradiation. The London blue topaz was obtained from Sri Lanka which classified into dark and light colors in the shape of an oval and rectangle with small, medium and large size. The optical property and radionuclide concentrations of London blue topaz have been examine by UV -...
Nickel-doped calcium copper titanate (CaCu3Ti4O12: CCTO) thin films were synthesized by a sol-gel method. All films were spin-coated with four layers on silicon and alumina substrates, and each film layer was annealed at a fixed annealing temperature of 800 °C. The obtained samples with different doping concentrations (0-7.27 wt%) were characterized by X-ray...
Stainless steel is steel alloy consisting of many elements including iron (majority), chromium, nickel and sulfur. Stainless steel has been widely utilized because it is more effective in terms of resistance of corrosion, rust or stain than ordinary steel. However, the electrical conductivity and surface hardness of stainless steel are not high. These disadvantages limit the engineering...
Alumina, such as glazed alumina for electrical insulator, operated in an open field subjects to a very harsh condition; resulting in lifetime shortening. Coating hydrophobic layer on alumina surface can help prolonging its lifetime. In this study, 25x25 mm alumina sheets were used as substrates. The hydrophobic composite polymers were prepared by (3-mercaptopropyl) trimethoxysilane (MPTMS),...
Polymer solar cells is one of the promising technologies that gain tremendous attentions in the field of renewable energy. Optimization of thickness for each layer is an important factor determining the efficiency of the solar cells. In this work, the optimum thickness of Poly(3,4-ethylenedioxythione) : poly(styrenesulfonate) (PEDOT:PSS), a famous material widely used as hole transporting...
Electrocardiography (ECG) signal is very important signal for identifying heart disease. It composes of five main characteristics which can be specified by the P-QRS-T signals. One of the most important segment in the signal is the QRS complex because it is the heart activity that electricity run all over heart which can tell many heart disease. There have been many studies on identifying the...
The measurement of moisture content in soil is based on the principle of neutron back scattering. In this principle, when fast neutrons emitted from a radioactive source collide with hydrogen atoms their energies are much greater reduced than colliding with other atoms. The number of slowed down neutrons, hence, represents the number of hydrogen atoms present in the vicinity of the source. As...
Metal-insulator transitions (MIT) are reversible changes in the conductivity of materials when the temperature above or below the transition point, which are the smart transitions in advanced material. Vanadium oxide (V$_\text{x}$O$_\text{y}$) demonstrated excellent MIT characteristics at the transition temperature (T$_\text{c}$) due to the lattice distortion. However, V$_\text{x}$O$_\text{y}$...
Sputtered Co81Pd19 films with thickness of about 60 nm were deposited on various under-layers (Al, Co, Cr, Cr and Ni) and on glass substrate. Structural, morphological and magnetic properties of Co81Pd19 films were investigated. All of prepared films showed CoPd (FCC) phase in (111) plane. Co (HCP) phase in (200) direction was observed in the films deposited Al, Cr and Ni under-layer and on...
Optical vortex is a mode of light whose phase distribution varies as e$^{im\phi }$, where m is called the topological charge of the vortex and ${\phi}$ is an azimuthal angle in the plane perpendicular to the propagating direction. The vortex beam of charge m carries an orbital angular momentum of mℏ and has its application in manipulating micrometer-sized particles. A common method to detect...
This study aimed to investigate students’ understanding and develop instructional material on a topic of simple harmonic motion. Participants were 80 students taking a course on vibrations and wave on the 2nd semester of an academic year 2016. A 20-question conceptual test and tutorial activities had been developed from previous research findings and evaluated by three physics experts in...
Investigation of L-H-L Transitions Criteria and
Hysteresis Based on Bifurcation Concept
A. Dang-Iad$^{1*}$ , T. Onjun$^2$ and B. Chatthong$^1$ ,
1Department of Physics, Faculty of Science, Prince of Songkla University,
Hat Yai, Songkhla, Thailand
2 Former Sirindhorn International Institute of Technology, Thammasat University, Pathum Thani, Thailand
This research aims to study the...
In this work the utilization of nuclear hydrological instruments using Liquid Scintillation Counter (LSC) and laser absorption spectrometer (Cavity Ring-Down Spectrometer, CRDS) were employed. All samples from the precipitation were treated for isotopic instruments. Tritium values were analyzed with electrolytic enrichment and LSC while deuterium and oxygen-18 were calculated on CDRS. As a...
The scientists once believed an atom was the smallest particle, nothing was smaller than this tiny particle. Later, they discovered an atom which consists of protons, neutrons and electrons, and they believed that these particles cannot be broken into the smaller particles. According to advanced technology, the scientists have discovered these particles are consist of a smaller particles. The...
Liposomes are phospholipid vesicles enclosing aqueous solution. Liposomes are used in many biomedical applications such as drug delivery and artificial cell models. Giant unilamellar vesicles (GUVs) fabrication using vortex ring in microfluidic device offers advantages over traditional GUVs fabrications such as rapid fabrication and controllable uniform vesicle sizes distribution. The...
ABSTRACT
3D carbon nanofiber scaffolding was produced from the pyrolysis of freeze-dried (FD) bacterial cellulose (BC). The thermogravimetry and differential thermal analysis (TG/DTA) showed the weight loss of BC during the pyrolysis process. The X-ray diffraction technique showed the high crystallinity of the FD-BC and the high amorphousness of the carbon nanofibers. Both FD-BC and the...
In this research, a low cost and disposable lab on a chip was designed and fabricated by screen printing. The chip was designed with integrated digital microfluidic microchip and electrochemical detector on single plate substrate. For the design, the chip consist of T-junction EWOD digital microfluidics microchip for merging buffer reagent and analyze droplets and an electrochemical detector...
The Specific Activities of $^{40}$K, $^{226}$Ra and $^{232}$Th were determinet for 30 beach sand samples collected from Talo kapo beach Yaring District in Pattani Province. Experimental results were obtained by using a high-purity germanium (HPGe) detector and gamma spectrometry analysis system. Gamma ray radioactive standard sources $^{137}$Cs and $^{60}$Co ware used to calibrate the...
Mechanical properties of cement paste containing iron powder
Nattapong Chuewongkam1, Panjasil Payakaniti2,Supree Pinitsoontorn1,2,3
1Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002 THAILAND
2 Materials Science and Nanotechnology Program, Department of Physics, Faculty of Science, KhonKaen University, KhonKaen 40002, Thailand
3Integrated Nanotechnology Research...
Electroporation is the technique in which external electrical field is applied across cells of interest to create pores on cell membrane when the voltage across the cell membrane is high enough. Electroporation is commonly used to deliver exogenous reagents such as genes, drugs, and nanoparticles for therapeutic purposes. In this work, microfluidic device was fabricated using Printed Circuit...
CaCu$_3$Ti$_4$O$_{12}$(CCTO)/SrTiO$_3$(STO) and CaCu$_3$Ti$_4$O$_{12}$(CCTO)/BaTiO$_3$(BTO) films multilayered heterostructures were successfully synthesized on LaAlO$_3$ (LAO) (100) substrates via a sol-gel method. The annealing temperature was fixed at 800 °C for one hour for each deposition. Our films were deposited with conditions as follows; CCTO/CCTO/CCTO/CCTO, STO/STO/STO/STO,...
With the realization of widespread use of large quantities of sex reversal hormone of the synthetic androgen 17Alpha-methyltestosterone (MT) affect on the environment and the inefficiency and cost of the conventional techniques, the hormonal sex reversal of economic fish needs to modified to avoid the excess use of MT, lessen the duration of treatment and lower the cost of MT hormone used...
Ag-doped CaCu3Ti4O12 (CCTO) thin films with different doping concentrations were prepared by a sol-gel technique. Films were grown by depositing four layers of CCTO on alumina substrates followed by sputtering Au/Cr interdigitated electrodes to fabricate gas sensors. The films were characterized by X-ray diffraction (XRD), field emission scanning electron...
ABSTRACT
Spin Seebeck effect (SSE) can be observed in magnetized ferromagnetic materials when subjected to a temperature gradient.In this work, the results on the SSE in the bulk strontium ferrite were demonstrated for the first time. The SSE measurement was developed in our lab and calibrated with a Y3Fe5O12 standard sample. The bulk strontium ferrite was characterized for the crystal...
The purpose of this work is to build a physics lab apparatus that is modern, low-cost and simple. In one dimensional two-body collisions experiment, we used the Arduino UNO R3 as a data acquisition system which was controlled by LabVIEW program. The photo gate sensors were designed using LED and LDR to measure position as a function of the time. Aluminum frame housewares and blower were used...
Nickel sulfide (NiS) nanoparticles were grew on multiwall carbon nanotube (CNTs) and coated onto FTO-glass by the one step hydrothermal method at 160°C. These films were applied as counter electrodes (CE) for dye-sensitized solar cells (DSSCs). In the present work, electrocatalytic activity and electron-charge transfer resistance are investigated though cyclic voltammetry and electrochemical...
ZnS, a wide band gap semiconductor and good candidate for dye sensitized semiconductor solar cell (DSSC) photoanode was doped with aluminum. However, the role of ZnS and Al-doped ZnS in DSSC is lack of knowledge. Herein, we studied the effect of ZnS and Al-doped ZnS in TiO$_2 photoanode using a simplest preparation. The thin film was prepared by doctor blade technique using a mixture of TiO$_2...
Titanium dioxide (TiO$_2$) thin films have been generally accepted as an important material in the fields of photocatalysis, photovoltaic and photochromic. The efficiency of TiO$_2$ films as an active layer in various applications strongly depends on their optical properties. In this present study, the optical properties of sputtered TiO$_2$ thin films were modified using nanoparticles gold...
The microring resonators have potential applications for the photonic integrated circuits. The dynamical phenomena of the two coupled microrings require a simple and efficient numerical formalism for solution of the system. We present a simplified theory of the optical tristability inside the two coupled microrings that take into account Kerr nonlinearity and the effect of loss. We also...
Copper (Cu) foil substrate is the most widely used as a substrate for graphene growth by chemical vapor deposition (CVD). It is known that the suitable morphology and crystal orientation of Cu foil substrate, which are crystal plane of Cu (111), low roughness and large grain size, are required for the growth of good film uniformity of graphene. The purpose is to investigate the evolution of...
Thermoluminescence properties of Thai commercial window glass provided by Guardian Industries Corporation (denoted as WG) were studied. WG was doped with varying concentrations of ZnO The composition of glass is 90WG-10Na2O-xZnO (where x = 0.000, 0.001, 0.010, 0.100, 1.000 mol%). Glass samples were recycled by using melt quenching technique and cut into the dimensions of 6×6×1 mm3. After...
Beta cyclodextrin (βCD) and its derivatives such as methylated βCD (MEβCD) and hydroxypropyl βCD (HPβCD) have been widely used to improve the solubility and the stability of poor water soluble drugs. Most drugs are completely bound inside the hydrophobic cavity interior of the βCDs. In the present work, we studied the pre-step of drugs releasing based on drug-βCDs complexes. The interaction...
Aluminum doped Zinc Oxide (AZO) nanoparticle thin films were deposited on glass substrates by double tips sparking process which is a simple, low cost method and can be done at room temperature. The effect of Al doped ZnO was studied in order to improve electrical and optical transmittance properties. The doping ratios of Al into ZnO were controlled by different sparking power using different...
In this work, hydroxyapatite (HA) and hydroxyapatite doped with Sr (HA-Sr), Zn (HA-Zn) and both Sr-Zn (HA-SrZn) were synthesized by a sol-gel method and combined with polycaprolactone (PCL) to make HA/PCL composites using an electrospinning technique. The synthesized nanoparticles and their composite fibers were investigated using various techniques. The X-Ray Diffraction (XRD) result showed...
In this work, the motion of a particle in one dimension, under the influence of the potential well that is modeled as the linear downward of length $L$ with a finite depth $|V_{0}|,$ is studied within the context of the non-relativistic quantum mechanics. The attention is paid on the paradoxical phenomenon of the reflection of a particle that is in contrast between classical and quantum...
Connecting physics concepts with that interest activities or with activities that interest. Thought will allow students strong to build a foundation. When an event of interest to the students, it will contribute to the students' responses, engaged and enthusiasm for learning. Learning activities resulting from things that interest and have found on a regular basis can have a lasting and...
ZnO nanorod arrays have become to attract much attention because the uniform and symmetry of ZnO nanorods can provide great optical and electrical potential in many nanodevices. Here, we have controlled nucleation sites using electron beam lithography technique and grown ZnO nanorods via hydrothermal synthesis to observe growth behaviors. We have measured diameter of nanorods and density of...
In this work, we developed an innovative physics lab apparatus that is modern, cheap and simple. The ultrasonic sensor was used to measure the position of a mass attached on a spring as a function of time. The data acquisition system and control device were developed based on LabVIEW interface with Arduino. The experimental was designed to explain the simple harmonics motion similar to the...
The present study proposes another alternative approach to model the geometry of Nile tilapia egg for evaluation of the induced transmembrane potential. The actual shape of tilapia egg is an asymmetrical prolate spheroid with a short prolate spheroid bottom and a more elongate prolate spheroid at the top with a common equator rather than a symmetrical prolate spheroid. Unfortunately, the...
Schlieren photography is a technique used to visualize density gradient of fluid medium, which is due to a linear relationship between fluid density and refractive indices. In this study, a single mirror off-axis schlieren system was employed to observe minimum temperature difference between room and heated object, vacuum flask.The tracker program was used in measuring relative light...
Silicon Carbide (SiC) is the chemical compound of carbon and silicon. Recognized as a perfect semiconductor with superior characteristics, SiC is widely used in high-temperature, high-power, and high-frequency electronic applications. Defects in a semiconductor have become a primary important issue since they can damage and change the unwanted electrical properties. The study of geometric and...
Stoichiometry and Performance in PCDTBT:Perylene Solar Cells
Wannakan Sathongsang1, Kanyaporn Thubthong1, Pisist Kumnorkaew2, Vinich Promarak3,
and Yingyot Infahsaeng1*
1Division of Physics, Faculty of Science and Technology, Thammasat University, Klong Nueng, Klong Luang Pathum-Thani, Thailand
2National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency...
The bulk heterojunction solar cell has been developed for many decades. The electron acceptor is one of the key performance in this solar cells, typically using fullerene derivatives. However, the free fullerene solar cell has been proposed using difference acceptor molecule. Herein, the morphology in bulk heterojunction PCDTBT:Perylene thin films of varied stoichiometry (1:1, 1:2 and 1:4...
The preparation of nanocomposites materials by using Polydimethylsiloxane (PDMS) with metal nanoparticles (gold and silver) and metal oxide nanoparticles (Zinc oxide and Titanium dioxide). Then, Characterization of the films was carried out by atomic force microscope (AFM) and fourier transform infrared spectroscopy (FTIR) after that the film creates to the electrodes on the film for applying...
The g-sensor with a wireless, using to study motion of hollow PVC-cylindrical on incline plane.This sensor will packed inside PVC-cylindrical. For experimental,We drop the PVC-cylindrical on the top of incline plane length 1.2 m.By changed high of plane at 3.5, 4.5, 5, 5.5, 6 and 6.5 cm relate to angle 0.0318, 0.0409, 0.0454, 0.0499, 0.0545 and 0.0590 rad respectively. The signal from the...
We aim to fabricate formaldehyde gas sensors for identifying formalin contamination of fresh raw food materials, especially seafood. Carbon nanotubes (CNTs) are one of materials widely used for fabrication of gas sensors because of their unique electronic properties. Unfortunately, pristine CNTs exhibit very low sensitivity for formaldehyde molecule adsorption. In this research, we have used...
One of the most important part of the Prompt Gamma Neutron Activation Analysis system (PGNAA) is the High Purity Germanium detector (HPGe). In this paper, the calibrations of an HPGe detector were made with the isotopic source $^{152}$Eu. The same detector was modelled in the MCNP5 and simulated. The thickness of the dead layer was determined. The simulated and experimental efficiency over the...
On the basis of electrical induction of eggs for sex reversal, the egg membrane exposed to a very short high-intensity electric field pulses can be temporarily permeable in specific regions of the egg. During the destabilization period, the membrane is highly permeable to exogeneous molecules present in the surrounding medium. Optimization of protocols has led to a situation where high egg...
In this study, the composition of sticky rice was studied using NMR relaxometry. Because the rice seeds have several elements, the NMR signal is multiexponential decay. However, its components that yield NMR signals can be separated by using Inverse Laplace Transform method. This method is data analyze by from least squares algorithms. The Downhill Simplex method was used to find the variable...
The irradiation is one of the gemstone enhancements for improving the gem quality. Typically, there are many varieties of irradiated gemstones in the gem market such as diamond, topaz, and sapphire. However, it is hard to identify the gemstones before and after irradiation. The aim of this study is to analyze the surface morphology for classifying the pre- and post- irradiated sapphires using...
Measuring surface water wave properties such as amplitude and wavelength can be difficult when the wave amplitude is very small. The digital image correlation (DIC) MATLAB program makes it possible to analyze such surface wave properties. The technique relies on analyzing of pattern displacement images due to surface perturbation of random patterns at the bottom of the water container. This...
CaCu$_3$Ti$_4$O$_1$$_2$ powders were synthesized by modified Sol-gel method with Hydrothermal using Ca(NO$_3$)$_2$• 4H$_2$O, Cu(NO$_3$)$_2$• 3H$_2$O, Ti(OC$_3$H$_7$)$_4$ and freshly extracted egg white (ovalbumin) in aqueous medium. The precursor was calcined at 800, 900 and 1000 °C in air for 8 h to obtain nanocrystalline powders of CaCu$_3$Ti$_4$O$_1$$_2$. The calcined...
The determination of the energy values, specifically the heat of combustion of various M-16 black powders werethe important part of the bulletefficiency investigations. The calorimetric bomb is commonly used for these determinations. Four M-16 black powders from the differences sources were used as samples for this research. It was found that,after using calorimetric bomb technique, the gross...
The effects of Fe-doping concentration in Ba$_{(1-x)}$Fe$_{x}$TiO$_{3}$ (x=0, 0.02, 0.04, 0.06 and 0.08) thin films prepared by a sol-gel method on their microstructure and magnetic properties were systematically studied. From X-ray diffraction measurements, the full width at half maximum (FWHM) of peaks were increased as the doping concentration increased. The thickness of the films measured...
The aim of this work is to investigate the laser cleaning of contaminants from surfaces of silica nanowires. Experimental parameters affected particle removal were explored using pulsed Nd:YAG laser radiation at a wavelength of 1064 nm. The laser beam was focused and scanned across the surfaces of the nanowires. The interaction between laser radiation and a certain thickness in the contaminant...
Alternative energy tends to be more widespread in Thailand because the advanced technologies enhance the potential of equipment which becomes more economically rather than setting in laboratory likes in the past. For this reason students should understand profoundly about the characteristic of energy before they learn about alternative energy. To help students get more comprehension about the...
The purpose of this study is to compare and estimate thermal diffusivities of conductor and insulator material by using photothermal deflection which varies frequency. The experimental setup consists of 2 laser lines: 1) a pump laser beams through a modulator, varied frequency, controlled by lock-in amplifier then focused beam at sample surface by lens. 2) a probe laser which is perpendicular...
Interactions in the Sun-Earth-Moon System are common misconception. Pre-service teacher should be developed in the Sun-Earth-Moon system to prepare for professional experience in school. So in this work revisit understanding of pre-service teacher in the Sun-Earth-Moon system, this emphasize moon phase concept compose of observe moon phase (shape) and position of the moon in the orbit about...
This study was to develop instruction media title the sound education by applying mathematica program. The objective of study are as follows compare achievement before and after learning of students received from activities of learning by instruction media title the sound education by applying mathematica program and study satisfaction of student to organize learning activities by instruction...
Chiral Phospholipids are found self-assembled into cylindrical tubules of 500 nm in diameter by helical winding of bilayer stripes under cooling in ethanol and water solution. Theoretical prediction and experimental evidence reported so far confirmed the modulated tilt direction in a helical striped pattern of the tubules. This molecular orientation morphology results in optically birefringent...
Abstract: The aim of this work was to study the effect of preparational factors such as solvent type, polymer concentration, evaporation time (ET) and non-solvent additive, on the morphological structure, physical and gas separation properties of the prepared membrane samples by tuning of these parameters. Flat sheet asymmetric polysulfone (PSF) membranes were prepared by the dry/wet phase...
The vacuum vaporization is a technique of thin-film deposition. This process is widely used in the semiconductor, microelectronic and optical industries which involved the deposition thin film of metals onto surfaces. The metals used was generated into their gas phases and deposited to substrate for a thin film. Currently, this technique is used to develop of visualized latent fingerprints on...
The analysis of electrical inductions of O.niloticus egg’s membrane is based on the transmembrane potential, induced due to applied electric field. The implication of the analytical model has been interpreted in terms of understanding the influence of egg size, pulse duration and electro-physical conditions of eggs on the E-field parameters (strength and duration) required for electroporation....
Living yeast cells in the brewery industry are active cells. They have different responses to AC electric field if they possess different dielectric properties. Electrical parameters which are used to determine health of yeast cells are the conductivities of the cytoplasm (CC), the cell membrane (MC), dielectric constant of the membrane and the cytoplasm, respectively. These parameters affect...
In this paper, we aim to characterize the microstructure of Yttrium doped TiO$_2$ nanotubes. These were successfully synthesized by anodization method on Ti sheets. The electrolyte was composed of ethylene glycol (EG), ammonium fluoride (0.3 % wt NH$_4$F) and deionized water (2% vol H$_2$O) with different concentrations of dopant Y$_2$O$_3$. A constant DC power supply of 50 V was used during...
