The 3D printing systems based on resin vat photopolymerization such as stereolithography (SLA) and digital light projection (DLP) techniques have become more accessible. These 3D printing technologies have numerous applications in different industries. This research aims to enhance mechanical properties of 3D-printed objects by adding carbon-based material i.e., graphene and carbon nanotubes...
The aim of this research was to evaluate the physical, mechanical and thermal properties of multilayer particleboards prepared from milk package (U.H.T.) wastes (TP) and coconut fibers (CO). The particleboards were produced with three layers ; A:(TP/CO/TP), B:(CO/TP/CO), C:(TP/TP+CO/TP), and D:(CO/TP+CO/CO) bonded with and methylene diphenyl diisocyanate (pMDI) 7%. The finding of experiment...
In this study biofuel pellet made from Para rubber wood (Hevea brasiliensis Muell. Arg.) blended with branches and leaves of She Oak (Casuarina Equisetifolia) and Cajuput trees (Melaleuca Cajuputi) were characterized. Para rubber wood sawdust was the main raw material as 70% of whole content. The branches and leaves of She Oak and Cajuput were selected for blending materials as the rest...
Freely suspended smectic films of a few molecular layers thick is a model system that can be used to study two dimensional phenomena. In our study, smectic C film was drawn across a few millimeter hole and stabilized under strong surface tension that can suspend 5CB nematic liquid crystal droplets sprayed onto it. Thermal fluctuation of liquid crystal molecules is observed across the smectic C...
The low evaporation temperature and carcinogen classification of commonly used molybdenum trioxide (MoO3) precursor render it unsuitable for the safe and practical synthesis of molybdenum disulfide (MoS2). Furthermore, as evidenced by several experimental findings, the associated reaction constitutes a multistep process prone to the formation of uncontrolled amounts of intermediate MoS2−yOy...
Small particle reagent (SPR) is a technique to detect latent fingerprints on wet non-porous surface by suspension of reagent is linked to fatty acid left on fingerprints. SPR can be used to detect latent fingerprints on evidence that has been submerged for a long time. Mostly investigate institution use SPR that import from foreigners, thus it is expensive and wait a long time. Many...
Abstract: The research studied the effect of annealing temperature on phase and thermoelectric properties of YBa2Cu3O7-x ceramics synthesized by hot pressing method. The hot-pressing condition involved the applied pressure of 70 MPa at 800 C for 1 h under Ar atmosphere. The YBCO ceramic samples were annealed in oxygen atmosphere at 700 and 750 C for 4 h. The XRD patterns of all samples...
In this research, ceramics fly-ash doped kaolin 10 to 50 wt.% were fabricated by solid-state reaction. All powders were weighed, mixed and further milled by ball-milling for 4 h. All compositions of powders were uniaxial pressed in pellets and sintered at the temperatures 1100 $^{\circ}$C for 4 h. Compositions of the ceramics were investigated by using X-ray diffraction technique. The particle...
In this work, PEDOT:PSS thin films were prepared on F-doped tin oxide SnO2 substrates by the spin coating method. The films were modified with HCl solution for 2 strategies, including doping and post-treatment. Then, some properties were studied. The X-ray diffraction patterns show only SnO2 peaks. However, the FTIR presented functional groups that corresponded to PEDOT and PSS. Contact angle...
This report presents the changes of structural, chemical and magnetic properties of the low-temperature phase manganese bismuth (LTP-MnBi) magnetic materials as a function of Mn grinding time. The grinding was conducted on the Mn powder with original average size of more than 400 m using the ball-milling technique. The grinding time was set to be 1-15 hr to obtain different Mn particle sizes...
X-ray absorption spectroscopy (XAS) were employed for the investigations on the local structure and oxidation state of Lithium Aluminum Borate Glasses($Li_{2}O$-$Al_{2}$$O_{3}$ -$B_{2}$$O_{3}$) doped with various concentrations of xNi:Co (where x = 1, 2, 3, and 4).XAS analyses revealed that all glasses comprise the mixed oxidation state of Ni$^{+2}$ and Ni$^{+3}$ corresponding to cyclic...
In this work, self-assembled iron (III)-tannic nanoparticles (Fe-TA NPs) were exploited as an eco-friendly antibacterial finishing agent for natural indigo (Strobilanthes Cusia) dyed cotton fabrics. Fe-TA NPs were synthesized at room temperature using an easy, low-cost, and reproducible method without the use of any toxic agents. The interaction between Fe3+ and TA and particle size of Fe-TA...
EFFECT OF SINTERING TIME ON PHASE, PHYSICAL PROPERTIES, MICROSTRUCTURE AND THERMAL CONDUCTIVITY OF Y(Ba$_{1-x}$ La$_x$)$_2$Cu$_3$O$_7-$$_\delta$ CERAMICS
Sireetone Yawirach $^{a,b}$, Pimpilai Wannasut$^a$, Anucha Watcharapasorn$^{a,c *}$
$^a$Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
$^b$Graduate School, Chiang Mai...
This research presents synthesis of sulfur doped bismuth oxychloride (S-doped BiOCl) powder by using microwave radiation with power of 450 Watt for 15 minutes. Different sulfur contents, 0, 2.5, 5 and 7.5 %mol, were purposed. Prepared samples were characterized by using X-ray diffraction (XRD), Fourier transform Infrared Spectroscopy (FT-IR), UV-Visible Spectrophotometer Field Emission...
Persistence probability is an interesting quantity used in the study of stochastic processes. According to J. Krug [1], persistence probability of height fluctuation is the probability that the height fluctuation does not return to its initial value throughout a time interval. The persistence probability exhibits power law decay with time with the exponent $\theta$. In this work, we use a...
The formation of low-temperature phase manganese bismuth (LTP-MnBi) prepared by liquid phase sintering (LPS) can be achieved through the diffusion of liquid Bi into Mn. It is known that the LPS process can produce the solid-liquid separation induced by gravitation which easily results in the non-uniform sintered MnBi particles. In this work, we aim to reduce such inhomogeneity by two...
The spin density functional calculations are performed to study the electronic and magnetic properties of $MoTe_{2}$ monolayer doped with single and double transition metal (V, Cr, Mn, Fe and Co) atoms. The electronic and magnetic properties are sensitive with the types and numbers of the doping transition metals. The semiconductor with narrow band gaps is shown in Cr and Co single-doped...
Abstract
Perovskite solar cells (PSCs) are among the rising technologies for clean energy harvesting. Although the platform is performing better, cheaper and can be more efficiently fabricated than the Si-based solar cells, the device suffers from low stability and durability against the ambient conditions. A general PSCs consists of consist of five layers: including Fluorine doped Tin Oxide...
To utilize heat sources around us, which provide low-temperature waste heat. Carbon-based or organic materials are capable thermoelectric applications in low temperature range, non-toxic, lightweight, and so on. Multi-wall carbon nanotubes (MWCNTs) show excellent electrical conductivity that leading to good thermoelectric property. Herein, we fabricated thermoelectric paper by using vacuum...
We present a simple technique based on a bottom-up approach to assembling single-walled carbon nanotubes (SWCNTs) in between two metal electrodes, making the SWCNT photodetectors with the capability of being operated at room temperature. This technique is known as dielectrophoresis (DEP) that exploits an electric field across the microelectrode gap with an application of a high-frequency AC...
La0.5Sr0.5TiO3 nanofibers were fabricated by simple electrospinning using a solution that contained poly(vinylpyrrolidone) (PVP), Lanthanum nitrate (La(NO3)3.6H2O), Strontium nitrate (N2O6Sr) and Diisopropoxytitanium bis(acetylacetonate) solution. The La0.5Sr0.5TiO3 nanofibers with average diameters of 109 – 140 nm were successfully obtained from calcination of the as-spun La0.5Sr0.5TiO3/PVP...
We argue that the Little-Parks effect, i.e., the oscillations of the
superconducting critical temperature $T_c$ as a function of the magnetic
flux threaded the superconducting cylinder, exhibits the feature of
the fractional quantized flux when a ferromagnetic metal filled in the
thin-walled superconducting shell, which caused by the exchange in-
teraction. Our analysis is based on the...
Water hyacinth (WH) is an invasive floating plant causing water pollution. However, its leaves contain a high cellulose content, which can be utilized as biomass to synthesize activated carbon. Thus, in this study, water hyacinth was subjected to the KOH activation process to obtain water hyacinth-based activated carbon (WH/AC). Moreover, as a novel method for nickel impregnation, gamma...
Ca[$Cu_{3-x}Ti_x]Ti_4O_{12}$ (x= 0.00, 0.03, 0.09, 0.15 and 0.30) ceramics were prepared using a solid-state reaction method. The mixed oxides were calcined at 800 °C for 5 h and then sintered at 1090 °C for 5 h. The effects of Ti doping ions on the microstructure and dielectric properties were studied. The results indicated that the Ca[$Cu_{3-x}Ti_x]Ti_4O_{12}$ showed improved dielectric...
In this study, the high-performance supercapacitor electrodes were fabricated via an activated carbon derived from Kapok shell. The raw biomass carbonization at 800 °C under Ar atmosphere was followed by microwave reflux process using the mixture of HNO3/H2SO4 ratio of 3:1 as a catalytic solution. The activated carbons with and without reflux treatment were characterized by TG, XRD, Raman and...
This work presents an alternative method to reduce the Mn particle size by adding glycerine during the ball-milling process. This glycerin addition is expected to prevent particle agglomeration to achieve the small and non-gathered Mn particles. The Mn and Bi precursors were fixed at an atomic ratio of 1:1 using Mn particles which were ball-milled in glycerin between 1 and 6 hr. It is seen...
Metal-Organic Frameworks (MOFs) are widely studied as anode materials for lithium-ion batteries (LIBs). They exhibit outstanding properties, such as prominent porosity, and molecular storage capacity, but they have a number of significant limitations, including poor electrical conductivity. In this case, MIL-53(Fe) was successfully prepared using pyrolysis carbon assisted from bacterial...
The high efficiency $\text{Cu}{{\text{In}}_{\text{1-x}}}\text{G}{{\text{a}}_{\text{x}}}\text{S}{{\text{e}}_{\text{2}}}$ (CIGS) solar cells are usually fabricated by the 3-stage deposition process for the CIGS layer. The Cu/[III] atomic ratio (CGI or y) in the $2^\text{nd}$ step of the 3-stage process is considered as one of important deposition parameters to achieve high efficiency devices,...
Geopolymers are a type of binding materials that can be used to replace cement to reduce environmental problems. In this research, the compressive strength, the curing time, was the microstructure and the chemical composition of the graphene oxide-based fly ash geopolymer material were studied, Geopolymer was prepared from high calcium fly ash, sodium silicate (Na2SiO3) sodium hydroxide (NaOH)...
In this work, the different sizes of LTP-MnBi powder prepared by vacuum sintering at 275ºC and time for 12 hr. responds to the magnetic properties, microstructure, and crystal structure. Cross-sectional MnBi powder particles were prepared for investigations by using scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM/EDS). The SEM/EDS results provide...
Currently, Most of the research reported on the preparation of Poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) by using N, N‐ dimethylformamide (DMF) as a solvent which is considered a cancerogenic substance. However, It is important to consider environmental hazards, toxicity and this research will focus on the use of "green" alternative solvents instead of the solvents. we are...
This research, ZnO nanostructures samples were successfully prepared by 0, 300 and 600 watt microwave-assistant method for 10 min. Characterization properties of ZnO samples were measured by powder using X-ray diffraction , Field emission scanning electron microscope , UV-visible diffuse reflectance spectra and dispersive X-ray spectroscopy . The analysis results found that products...
This work aims the preparation of corncob-derived activated carbon (CCAC) by using 3M sodium chloride aqueous solution as the activated agent, and was pyrolyzed at 600, 700, and 800C. Waste composites of CCAC with the activated corn husk fiber (ACH-fiber) and natural rubber latex (NR-latex) adhesive applied for multifunction acoustic board (MCB), and the acoustic board waste composite...
Nickel oxide (NiOx) thin films prepared by using nickel acetate and nitrate as hole transporting layer (HTL) in perovskite solar cells (PSCs) were studied. Herein, the effect of concentrations of nickel acetate (0.1, 0.2, and 0.3 M) mixed with a fixed 0.1 M of nickel nitrate for NiOx thin film preparation was investigated. The crystal structure and optical properties were characterized by...
The conversion of heat to spin current is well known as spin Seebeck effect (SSE). In this study, we observed spin voltage on Co and Nb which acing for spin detector whereas the ferrimaganetic (YIG) is used for spin injector. We studied phase diagram, surface structure and magnetic property by XRD, SEM and VSM, respectively. For SSE, the magnetic field dependence and temperature dependence are...
Alkali activated material has been considered as a high potential construction material for replacing or reducing cement usage. However, proper curing at specific temperatures is necessary for optimizing the alkali activated material’s strength and durability performance. In this work, a novel technique for curing alkali activated material is proposed based on the ohmic heating principle by...
Facile paste-injection molding is an alternative to produce barium hexaferrite magnets with comparable magnetic properties of higher-density compact magnets. Aqueous-based pastes were prepared by mixing barium carbonate and iron oxide powders, with poly(vinyl alcohol) as the binder, poly(ethylene glycol) as the plasticizer, and EFKA® FA4620 as the dispersing agent. The homogeneous...
The aim of research was successfully synthesized copper doping on bismuth oxychloride based by microwave assisted radiation method power 300 watt for 15 minutes. Defining conditions of samples preparation copper were doped following 0, 2.5, 5.0 and 7.5 %mol. All samples were examined for their properties and characteristics using X-ray diffraction (XRD), Field Emission scanning Electron...
A simple spray coating technique was used to prepare a PDMS-modified SiO2 top layer on the paper substrate. The wettability, microstructure of the coated papers, and durability and adhesion of the coating at different pH settings of the nanosolution (pH2, pH3, pH4 and pH5) were investigated using the water contact angle (WCA) and sliding angle (WSA), Fourier transform infrared spectroscopy...
In this work, the successful preparation of the multilayer Titanium/Titanium doped diamond-like carbon (Ti/Ti-DLC) films deposited on low-carbon steel (CS) using hybrid magnetron sputtering and plasma enhanced chemical vapor deposition methods (MS-PECVD) has been reported. The chemical and structural properties of the multilayer Ti/Ti-DLC films with varied numbers of Ti/Ti-DLC layers were...
In this study, the surface of filter paper was modified with TiO2-PDMS-KH550 nanocomposites using titanium isoproproxide (TTIP) as the starting material by spray coating technique. To obtain the desired active coating, the amount of PPIT in the mixture was changed by 0.39, 0.78, and 1.56 mmol. The wettability, microstructure of the coated papers, and durability and adhesion of the...
Poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) was chosen as a hole transport layer for inverted perovskite layer. It is the first layer deposited on the FTO substrate and thus directly affect the structure and performance of the inverted or p-i-n perovskite solar cells. It was found that untreated PTAA layer yielded large distribution of photovoltaic parameters and low...
In this work, nickel compound quantum dots (Ni-QDs) are synthesized by electrochemical process. The electrochemical process known as a facile method is used to prepare Ni-QDs colloid solution. Ni-QDs are synthesized using nickel-metal rods (2 mm in dimension and 5 cm in length) dipped into an electrolyte solution of potassium chloride and citric acid at 0.4M and 0.1M concentrations,...
Piyachat Keeraj, Tanadol Sooktong, Wasan Maiaugree, and Yingyot Infahsaeng*
Division of Physics, Faculty of Science and Technology, Thammasat University, Pathum Thani 12120, Thailand
In this work, reduced graphene oxide (rGO) has been synthesized by using Siam weed, (Cromulent Odorata) through carbonization technique and reduced in eco- friendly manner by using Modified Hummer’s process....
In this study, manganese dioxide (MnO2) was synthesized by hydrothermal method using different urea (CO(NH2)2) of No Urea, Urea 0.0686 mL, Urea 0.686 mL, and Urea 6.86 mL. Crystal structure of synthesized MnO2 was evaluated by X-ray diffraction technique to be delta-MnO2 structure (No Urea and Urea 0.0686 mL) and alpha-MnO2 structure (Urea 0.686 mL and Urea 6.86 mL). Morphology of delta-MnO2...
Iron oxide (Fe3O4) ceramic magnets were prepared by using the cold sintering process. The nitric acid solution and water are liquid mediums. The Fe3O4 1.5g and nitric acid 0wt%, 3%wt%, 5wt%, and 10wt% were used. The phase and morphology were characterized by X-Ray diffraction (XRD) and field emission scanning electron microscope (FESEM), respectively. The XRD analysis showed the peaks...
Vibrating sample magnetometry (VSM) is a powerful technique for investigations of magnetic properties of matters. One important drawback of this technique is the ‘open-loop’ setup which can significantly distort the exact magnetic properties. Thus, appropriate corrections especially in the strong ferromagnet such as permanent magnets is required. In this work, we design the systematic...
Hexagonal GaN (h-GaN) films were grown on GaAs (001) substrates by metalorganic vapor phase epitaxy (MOVPE). Two GaN samples were grown with different the thickness of each was 2.35 ± 0.08 and 3.07 ± 0.12 μm, respectively. High resolution X-ray diffraction was used to study the secondary crystallographic phases presented in the h-GaN films. The phase composition of the epilayers was determined...
In this project, copper selenide compounds (Cu$_2$Se) were synthesized and used as for use as p-type thermoelectric materials. Graphene oxide (GO) at 0.1, 0.5 and 1 wt% concentrations was added in the Cu$_2$Se compounds. Cu$_2$Se was synthesized by a ball mill method, adding GO at various concentrations by crushing and mixing, followed by shaking. It was then hot-pressed to obtain high density...
The conversion of heat to spin current is well known as spin Seebeck effect (SSE). In this study, we observed spin voltage on Si/YIG/W by multilayer technique. We studied phase diagram, surface structure and magnetic property by XRD, SEM and VSM, respectively. For SSE, the magnetic field dependence and temperature dependence are also observed. We found that the voltage of Si/YIG/W multilayer...
The study guideline to develop the feasibility of producing low temperature ceramics with the natural fibers. The ceramics prepared by mixed powder of kaolin and fly ash with equal ratio (kaolin/fly-ash: 50/50 wt.%) and milled by ball-milling technique. The natural fibers from local pineapple leaves replaced to ceramics by 5, 10, 15, 20 and 25 wt.%. Green pellets of 30.0 mm diameter were...
The conversion of heat to spin current is well known as spin Seebeck effect. In this study, we observed spin voltage on cobalt (Co) and Iron (Fe) which acing for spin detector whereas the ferrimagnetic (YIG) is used for spin injector. The YIG is coated on Si-wafer by sputtering technique whereas the Co and Fe are prepared by thermal evaporation technique on zigzag pattern. We checked phase...
We theoretically studied the tunneling magnetoresistance of a heterostructure ferromagnetic metal-insulator-ferromagnetic metal junction. By modifying the theoretical model used by Slonczewski with the inclusion of a small external magnetic field, we theoretically consider the impact of the barrier potential, or the band gap and the thickness of the insulating layer. We found that higher...
The phonon-liquid electron-crystal becomes a fascinating concept for thermoelectric material in recent years. The Cu2Se is a potential material for this concept. Due to it goods electrical properties of Cu2Se, this work is successfully synthesized Cu2Se powder using a high-energy ball milling method. The Cu2Se disc-shaped pellets were prepared by the...
