https://sure.su.ac.th/xmlui/handle/123456789/15578 2026-07-22T17:49:08Z 2026-07-22T17:49:08Z นันทนิฒณ์ ภทรพีทรานันฐ์ https://sure.su.ac.th/xmlui/handle/123456789/28403 2024-05-15T20:08:40Z 0017-01-01T00:00:00Z

Preparation and performance of functional materials for catalyst and energy applications; Preparation and performance of functional materials for catalyst and energy applications นันทนิฒณ์ ภทรพีทรานันฐ์ The main aim of this dissertation is to study the preparation and performance of functional materials, including coconut shell based activated carbon (ACCS), coconut shell based activated carbon-titania hybrid (ACCS/TiO2), and titania-based ceramics/polymer hybrid materials for energy storage and photocatalyst applications. Coconut shell was successfully utilized as a low cost alternative material for the electrode in supercapacitor device and the removal of textile dye. The highly porous activated carbon with high specific surface area was prepared from agricultural coconut shell waste as precursor with KOH activation at impregnation ratio of 3:1 and carbonization at 800 °C. For electrochemical test, the obtained ACCS electrode showed excellent electrochemical behavior with a maximum specific capacitance of 149.65 F/g at a current density of 0.5 A/g and the highest energy density of 4.64 Wh/kg at the power density of 239.66 W/kg. Furthermore, this resulting electrode also showed good rate capability and the specific capacitance decreased less than 35% (65% capacity retention) as the current density was raised from 0.5 to 4 A/g. For photocatalytic test, TiO2/activated carbon double-layered film photocatalyts were successfully fabricated using an electrophoretic deposition technique without additives. Pristine TiO2 powder was synthesized by solvothermal process. The obtained hybrid catalyst film showed the maximum efficiency for removing methylene blue of about 97% at 60 min under UV light.The hybrid film system has an advantage for wastewater treatment in practical applications because it is easy to separate from the process and reusable with relatively high photocatalytic efficiency. Furthermore, the titania-based ceramics-polymer hybrid materials; bismuth titanate/polyvinylpyrrolidone (BiT/PVP) and barium titanate/poly-(vinylidene fluoride) (BTNFs/PVDF) nanohybrids, were prepared and their performances were tested. The nanohybrids were synthesized and fabricated using the sol-gel chemistry followed by extrusion based 3D-printing (FDM) technique. The BiT/PVP sample with 3.0 vol. % of PVP exhibited a good printing speed range enlarged over 50% of pure BiT gel. The obtained results are useful for optimizing and setting the 3D printing parameters. Moreover, the anisotropic 3D BTNFs/PVDF nanohybrids were successfully fabricated via FDM technique and BTNFs were synthesized via sol-gel followed by electrospinning method. The BTNFs/PVDF 3D-nanohybrids with 20 vol. % BTNFs, exhibited the highest dielectric constant in cross-direction around 200 at frequency of 1 kHz at room temperature, vs 13 of the neat PVDF materials. This FDM technique indicated great potential for future development in high-k ferroelectric ceramic/polymer composites with controllable anisotropic properties.; -

0017-01-01T00:00:00Z https://sure.su.ac.th/xmlui/handle/123456789/24798 2023-11-30T20:07:23Z 0012-01-01T00:00:00Z

Bio-based plastics reinforced with natural fibers/hybrid composites through reactive processing; - The reinforced PLA composite and hybrid composites with natural fibers, inorganic filler and/or synthetic fiber were fabricated by in situ reactive melt-blending in one-step process and their properties were investigated. The PLA/natural fiber interfacial adhesion was improved due to the presented multifunctional epoxide-based reactive agent (CEGMA) as proved by SEM images and Molau test. The highest tensile strength was obtained from PLA biocomposites incorporated with 1.0 phr CEGMA, which was improved by 13.9% compared to non-reactive biocomposite. The reactive PLA hybrid composite with 1:1 fiber:talc ratio fabricated using twin-screw extruder showed the highest improvement on storage modulus in the rubbery region. In order to provide more reactive site on filler surface, fiber and talc were successfully treated with MAH during the drying process, which was revealed by FT-IR spectra. Tensile strength and impact strength of the PLA hybrid composites were slightly improved by 6% when only CEGMA was added. However, MAH-treated fillers reinforced PLA with CEGMA and peroxide loading not only showed the most improvement on tensile and impact strength by 11 and 36% but also their interfacial adhesion compared to non-reactive hybrid composite. The reactive PLA/MAH-treated Jute/Carbon fiber hybrid composite was prepared using direct fiber feeding injection molding in term of practical use. Tensile strength of the reactive composite and hybrid composite was higher than non-reactive hybrid composite by 14.9 and 6.8% due to strong interfacial adhesion. It was confirmed that the in situ compatibilization between MAH-treated fiber and PLA chain could occur in short reaction time.; -

0012-01-01T00:00:00Z Rattikarn Khankrua รัตติกาล ขันธ์เครือ https://sure.su.ac.th/xmlui/handle/123456789/13723 2020-11-09T08:05:17Z 2016-01-01T00:00:00Z

Enhancement of thermal stability of biodegradable polymers Rattikarn Khankrua; รัตติกาล ขันธ์เครือ

2016-01-01T00:00:00Z Bawornkit Nekhamanurak https://sure.su.ac.th/xmlui/handle/123456789/13722 2020-11-09T08:18:35Z 2011-01-01T00:00:00Z

Effect of surface-modified calcium carbonate nano-particles on properties of biocomposites Bawornkit Nekhamanurak

2011-01-01T00:00:00Z