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RISS 인기검색어
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- 저자 : Siriwat Soontaranon (검색결과 4 건)
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Abdulhakim Masa,Siriwat Soontaranon,Nabil Hayeemasae 한국고분자학회 2020 폴리머 Vol.44 No.4
Sulfur and accelerators play very important roles in curing natural rubber, influencing the properties of rubber vulcanizates. Such properties are also associated with the microstructure of vulcanized natural rubber. In this study, the relationships between tensile properties, strain-induced crystallization behavior, and structural inhomogeneity were investigated with special attention to the ratio of sulfur to accelerator (S/Acc). Increasing the S/Acc ratio increased crosslink density, simply from having more of the crosslinking agent. The highest tensile strength was obtained at unit ratio (=1), which was associated with SIC behavior based on wide angle x-ray diffraction measurements. Reductions in both the tensile strength and crystallinity were noticed when the crosslink density was relatively high. Structural inhomogeneity of network structures induced by crosslinking was investigated by means of small angle x-ray scattering, which showed the increased size and improved homogeneity of distribution with increased S/Acc ratio.
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Natechanok Chansorn,Sujitra Amnuaypanich,Siriwat Soontaranon,Supagorn Rugmai,Sittipong Amnuaypanich 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
Solketal, a fuel additive, was synthesized from the solvent-free ketalization reaction of glycerol and acetoneusing phosphotungstic acid (PTA) catalysts. Due to strong acidity, PTA is expected to serve as an efficientacid catalyst, however low specific surface area of bulk PTA and the deactivation, by water,denounces its acid activity leading to low solketal production. The present study demonstrates a successin increasing the solketal yield in the ketalization catalyzed by PTA immobilized in the layer of poly(Nmethyl-4-vinylpyridinium) grafted on silica nanoparticles (SNSs-g-PMVP/PTA). PTA with the size of 1–2 nm were dispersed in the grafted-layer of PMVP under strong binding to positively charged pyridiniumwhile the grafted-PMVP provided the hydrophobic environment improving the water-tolerance of PTA. Inaddition, acid-base interactions between PTA and the pyridine group in the grafted-PMVP transformedPTA hexahydrate to PTA trihydrate. Using SNSs-g-PMVP/PTA catalyst resulted in increasing of the solketalyield above 90% within an hour of the glycerol ketalization compared with 17% yield of solketal in theketalization catalyzed by unsupported PTA.
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Ahmad Taufiq,Yuanita Amalia Hariyanto,Sunaryono,Siriwat Soontaranon 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.9
Hydroxyapatite, which has been widely used in the medical eld in the last couple of years, is a superior biomaterial due to its biocompatibility and nontoxicity. Hydroxyapatite requires highly magnetic materials to perform maximally in specic medical elds. In this study, hydroxyap- atite/magnetite composites mainly composed of limestone and natural iron sand were synthesized through a coprecipitation method, and composites having different hydroxyapatite-to-magnetite mass ratios were compared. The crystal structure, particle size, fractal dimension, morphology, functional group, and energy gap were characterized using X-ray diffraction (XRD), synchrotron X-ray scattering (SAXS), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and ultraviolent-visible (UV-Vis) spectroscopy. The research results showed that the hydroxyapatite and magnetite phases had a hexagonal structure and cubic structure, respectively. In general, from the FTIR data analysis, the hydroxyapatite and magnetite particles were iden- tied from the functional groups of phosphate, iron-oxygen, carbonate, and hydroxyl. Moreover, depending on particle size, the samples consisting of 3.7-nm primary particles formed a cluster with a massive three-dimensional structure. Meanwhile, the energy gap showed various values ranging between 3.25 and 3.86 eV.
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Small-Angle X-Ray Scattering Study on PVA/Fe3O4 Magnetic Hydrogels
Sunaryono,Ahmad Taufiq,Edy Giri Rahman Putra,Atsushi Okazawa,Isao Watanabe,Norimichi Kojima,Supagorn Rugmai,Siriwat Soontaranon,Mohammad Zainuri,Triwikantoro,Suminar Pratapa,Darminto 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.3
A synchrotron small-angle X-ray scattering (SAXS) study on PVA/Fe3O4 magnetic hydrogels has been performed to investigate the effect of clustering on their magnetic properties. The hydrogels were prepared through freezing–thawing (F–T) processes. The structure, morphology and magnetic properties of magnetite (Fe3O4) nanoparticles (NPs) were investigated using X-ray diffractometry (XRD), transmission electron microscopy (TEM) and a superconducting quantum interference device (SQUID) magnetometer, respectively. In this study, SAXS data were used to reveal the structural dimensions of the magnetite and its distribution in the polymer-rich PVA and magnetic hydrogels. As calculated using the Beaucage and Teubner–Strey models, the average of the structural dimensions of the PVA hydrogels was 3.9 nm (crystallites), while the average distance between crystallites was approximately 18 nm. Further analysis by applying a two-lognormal distribution showed that the magnetite NPs comprised secondary particles with a diameter of 9.6 nm that were structured by primary particles (~3.2 nm). A two-lognormal distribution function has also been used in describing the size distributions of magnetite NPs in magnetic hydrogels. The clusters of magnetite NPs in the magnetic hydrogels are significantly reduced from 30.4 nm to 12.8 nm with decreasing concentration of the NPs magnetite from 15 wt.% to 1 wt.%. The saturation magnetization values of the magnetite NPs, the 15% and 1% magnetic hydrogels were 34.67 emu/g, 6.52 emu/g and 0.37 emu/g, respectively.
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