Voranuch Thongpool | Rajamangala University of Technology Thanyaburi (original) (raw)
electrical conductivity, ) (siemen/m) J E
Digest Journal of Nanomaterials and Biostructures
This study blended low-density polyethylene (LDPE) polymer matrix with titanium dioxide (TiO2) na... more This study blended low-density polyethylene (LDPE) polymer matrix with titanium dioxide (TiO2) nanoparticles as UV blocking filler to create a greenhouse cover film. The best properties for greenhouse application were discovered in TiO2/LDPE nanocomposites films with 5% wt TiO2 nanoparticles, according to the results. TiO2/LDPE nanocomposites films prepared in all conditions can block almost 100% of the UV (200- 400 nm) radiation and show good thermal stability. The TiO2/LDPE nanocomposites films with 5% wt TiO2 nanoparticles has a light transmittance in the visible range of about 80%, sufficient for plant photosynthesis. In addition, it showed good mechanical properties with 12.142 MPa of tensile strength and 319.274% of elongation at break.
Digest Journal of Nanomaterials and Biostructures, 2023
This study blended low-density polyethylene (LDPE) polymer matrix with titanium dioxide (TiO 2) n... more This study blended low-density polyethylene (LDPE) polymer matrix with titanium dioxide (TiO 2) nanoparticles as UV blocking filler to create a greenhouse cover film. The best properties for greenhouse application were discovered in TiO2/LDPE nanocomposites films with 5% wt TiO 2 nanoparticles, according to the results. TiO2/LDPE nanocomposites films prepared in all conditions can block almost 100% of the UV (200-400 nm) radiation and show good thermal stability. The TiO 2 /LDPE nanocomposites films with 5% wt TiO 2 nanoparticles has a light transmittance in the visible range of about 80%, sufficient for plant photosynthesis. In addition, it showed good mechanical properties with 12.142 MPa of tensile strength and 319.274% of elongation at break.
Journal of Physics: Conference Series, 2019
In this research, the effects of calcination temperature and reaction time on the photoluminescen... more In this research, the effects of calcination temperature and reaction time on the photoluminescent properties of ZnO nanorods prepared by hydrothermal processes were studied. Morphology, crystalline structure and photoluminescent properties of the prepared samples were analyzed by scanning electron microscope (SEM), X-ray diffractrometer (XRD) and fluorescent spectrophotometer. The study found that a reaction time of 5 hours on a glass slide and calcination at 500°C was the best preparation condition. The prepared ZnO nanorods were aligned without direction and distributed throughout the substrate. The average diameter of the prepared ZnO nanorods was 91.96 ± 21.16 nm. The prepared ZnO nanorods comprised a hexagonal crystalline structure with an emission peak in the UV range.
Procedia Engineering, 2012
Electrical conductivity of bulk graphite was investigated as a function of its volume density and... more Electrical conductivity of bulk graphite was investigated as a function of its volume density and temperature. The bulk graphite was prepared from pressing natural graphite powders obtained from two different conditions: i) without any treatment and ii) with 24 hr of ultrasonic treatment. Powders from each condition were consolidated using an isobaric press of different pressures, including 5, 10, 20, 30, 40 and 50 MPa. Ultrasonic treatment helped to exfoliate graphene from its parent graphite which enhanced the electrical conductivity of the compressed bulk graphite. Scanning electron microscopy (SEM) and UV-Vis spectroscopy confirmed that multilayer graphenes and nanographite were obtained after the sonication. Raman spectroscopy was also used to investigate the graphitic characteristics of sonicated graphite. The bulk graphite of 50 MPa consolidation from the sonicated powders offered the highest electrical conductivity which was due to its highest density as well as a combination of multilayer graphene. Effect of temperature on the electrical conductivity was discussed. The conductivity increases when increasing the temperature.
Procedia Engineering, 2012
Carbon particles were synthesized via laser ablation of a bulk graphite in ethanol medium using N... more Carbon particles were synthesized via laser ablation of a bulk graphite in ethanol medium using Nd:YAG laser with a wavelength of 1064 nm. The target was irradiated by the laser beam with a pulse energy of 3 J, a pulse repetition rate of 2 Hz, and a pulse duration of 5 ms. Effect of using ethanol as a liquid medium for laser ablation on physical, chemical, and optical properties of resulted carbon particles was reported. SEM images presented that a flake-like morphology of graphite in the target has been transformed into a flower-like cluster after the ablation. Raman measurement showed that G peak position of the graphite flakes and that of the synthesized carbon particles were similar, about 1582 cm-1 , whereas D peak position and its shape of the synthesized particles was different from those of graphite flakes. UV-visible and fluorescent spectrometers were used to investigate absorption and emission characteristics of the particles, respectively. The carbon particles can absorb a light in the UV range and emit a photoluminescence of bright blue-green color.
Water Resources and Industry, 2021
Computers, Materials & Continua, 2022
This research investigates a monopole patch antenna for Wi-Fi applications at 2.45 and 5.2 GHz, a... more This research investigates a monopole patch antenna for Wi-Fi applications at 2.45 and 5.2 GHz, and WiMax at 3.5 GHz. A low-cost and flexible graphite sheet with good conductivity, base on graphite conductive powder and glue is used to create a radiator patch and ground plane. Instead of commercially available conductive inks or graphite sheets, we use our selfproduced graphite liquid to create the graphite sheet because it is easy to produce and inexpensive. The antenna structure is formed using a low-cost and easy hand-screen printing approach that involved placing graphite liquid on a bendable polyester substrate. This research focuses on designing and developing a low-cost, thin, light, and flexible patch antenna for wireless communication and smart glass applications. The proposed antenna utilizes CST microwave software for simulations to improve the parameters before fabrication and measurement. The simulation and measurement results for the reflection coefficients at 2.45 GHz, 3.5 GHz, and 5.20 GHz are reliable and cover the required resonance frequencies, antennas gain are 1.91, 1.98, and 1.87 dB, respectively. Additionally, the radiation patterns of both results are omnidirectional. In the experiments, bending the proposed patch antenna along with the cylinder with the radii of 60, 40, and 25 mm yielded the same measurement results as the unbent patch antenna.
Results in Physics
Cu-N co-doped TiO 2 nanoparticles were synthesized using the sol-gel method at different Cu conce... more Cu-N co-doped TiO 2 nanoparticles were synthesized using the sol-gel method at different Cu concentrations (0.1, 0.3, and 0.5 wt%). The synthesized nanoparticles were characterized using X-ray diffractometer (XRD), Fourier transform infrared spectrophotometer (FTIR), field emission scanning electron microscopy and energy dispersive X-ray spectrometer (FESEM/EDS), and UV-vis spectrophotometry (UV-vis). The synthesized spherical nanoparticles were grouped into large clusters. Pure TiO 2 nanoparticles exhibited the anatase phase, while Cu-N codoped TiO 2 nanoparticles showed both anatase and rutile phases. In addition, Cu-N co-doped TiO 2 nanoparticles showed higher light absorption than pure TiO 2 nanoparticles, which affected the photocatalytic efficiency. The photocatalytic degradation of methylene blue (MB) was tested under UV and visible light. Under UV light, pure TiO 2 nanoparticles exhibited a maximum photocatalytic efficiency of 88.62% within 90 min. While 0.1 Cu-N codoped TiO 2 nanoparticles tend to be effective in photocatalytic efficiency under visible light, they were able to degrade MB up to 56.33%.
ฟลมผสมระหวางโปรตนเซรซนจากรงไหมพนธไทยและพอลไวนลแอลกอฮอล ถกเตรยมขนดวยวธขนรปฟลมแบบหลอในแมพมพ (Moldin... more ฟลมผสมระหวางโปรตนเซรซนจากรงไหมพนธไทยและพอลไวนลแอลกอฮอล ถกเตรยมขนดวยวธขนรปฟลมแบบหลอในแมพมพ (Molding) โดยทำการศกษาผลของปรมาณพอลไวนลแอลกอฮอลตอคณสมบตการดดกลนคลนแสง มมสมผส ลกษณะของพนผว การบวมนำ การสลายตว และการปลดปลอยสารละลายเมทลลนบลของแผนฟลม จากผลการทดลองพบวาฟลมทเตรยมไดมการดดกลนแสงในชวง 278 nm (ยานรงส UVC) และ 385 nm (ยานรงส UVA) มคณสมบตไมชอบนำ แตมความสามารถในการบวมนำไดด โดยมคารอยละของการบวมนำสงสดเทากบ 538.4615 สามารถสลายตวและปลดปลอยสารละลายเมทลลนบลไดอยางรวดเรว
The 15th International Conference of International Academy of Physical Sciences Dec 9 - 13, 2012,... more The 15th International Conference of International Academy of Physical Sciences Dec 9 - 13, 2012, Pathumthani, Thailand.
Nowadays inorganic scintillators play an important role in detection and spectroscopy of energeti... more Nowadays inorganic scintillators play an important role in detection and spectroscopy of energetic photons and nuclear particles, in particular medical imaging. Important requirements for the scintillation crystals used in these applications include high light yield, fast response time, high stopping power, good energy resolution, good proportionality of light yield, minimal afterglow and low production costs. The main advantages of Bi4Ge3O12(BGO) are high stopping power and non-hygroscopic which make them very promising scintillator for medical imaging. The aims of this work are to perform the further study of light yield non-proportionality and energy resolution of different sizes of BGO crystals covering energies from 22.1 to 1,274.5 keV using photomultiplier tube (PMT) readout. The intrinsic resolution of all crystals has been determined after correcting the measured energy resolution for PMT statistics. The result demonstrates that the contribution from the non-proportional res...
3rd International conference on Innovative Engineering Technologies (ICIET'2016) August 5-6, 2016 Bangkok (Thailand), Aug 5, 2016
The reduction of graphene oxide (GO) by Hummer's methods was investigated using Ascorbic acid. Th... more The reduction of graphene oxide (GO) by Hummer's methods was investigated using Ascorbic acid. The prepared GO and Ascorbic acid reduced GO (RGO) were haracterized by SEM, XRD, Fourier transform infrared, Raman spectroscopy, ultraviolet-visible spectroscopy and electrical conductivity.
In this research, tungsten doped titanium dioxide nanofibers were prepared by the hydrothermal me... more In this research, tungsten doped titanium dioxide nanofibers were prepared by the hydrothermal method and used as a photocatalyst in the photocatalytic process. The prepared samples were investigated by XRD, FESEM, and UV-vis spectrophotometer. The experimental results show that the prepared samples have an anatase phase and absorb UV light. In addition, it was found that the increased amount of tungsten resulted in larger crystal size. For the efficiency of paraquat degradation by the photocatalytic activity of the prepared nanofibers, it was found that the W:15TiO2 nanofibers had the highest efficiency of paraquat degradation. It can degrade 73.97% of paraquat in 120 min.
ACS Applied Materials & Interfaces
Applied Mechanics and Materials
Nowadays, radioactive materials are being applied in medical imaging. Because humans cannot obser... more Nowadays, radioactive materials are being applied in medical imaging. Because humans cannot observe radiation, radiation detection materials are very important to humans. A scintillator is a material that can change gamma photons to visible photons. Good scintillators should have the following properties: high scintillation light yield, good energy resolution, and high density. In this work, the scintillation light yield property of CWO crystals was studied due to its interesting properties, such as high stopping power and low hygroscopicity. CWO crystals were compared with BGO crystals. From the results, it was found that the BGO crystals showed higher scintillation light yield value at 662 keV energy from 137Cs radioactive source than the CWO crystals, resulting in better energy resolution value. The intrinsic light yield and loss parameters for both crystals are also presented in this work.
บทที่ 7 โลหะและโลหะผสม ผศ.ดร.สุภาสินี ลิมปานุภาพ
บทที่ 6 เฟสและแผนภาพเฟส ผศ.ดร.สุภาสินี ลิมปานุภาพ
บทที 5 สมบัติเชิงกลของวัสดุ ผศ.ดร.สุภาสินี ลิมปานุภาพ
บทที 4 ความไม่สมบูรณ์ในของแข็ง ผศ.ดร.สุภาสินี ลิมปานุภาพ
บทที 3 โครงสร้างของของแข็งผลึก ผศ.ดร.สุภาสินี ลิมปานุภาพ
บทที 2 โครงสร้างอะตอมและพันธะระหว่างอะตอม ผศ.ดร.สุภาสินี ลิมปานุภาพ
บทที 1 บทนำ ผศ.ดร.สุภาสินี ลิมปานุภาพ