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- 저자 : Sunaryono (검색결과 3 건)
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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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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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A. Taufiq,A. F. Muyasaroh,S. Sunaryono,H. Susanto,N. Hidayat,N. Mufti,E. Suarsini,A. Hidayat,A. Okazawa,T. Ishida,D. Darminto 한국자기학회 2018 Journal of Magnetics Vol.23 No.3
In this work, the soft-template technique was employed in preparing the superparamagnetic Fe₃O₄ nanoparticles from natural iron sand. A series of the Fe3O4 nanoparticles formed spinel crystal structure with the particle size in the range of 1.9 to 6.6 nm which was varied by diethylamine concentration as the template. All samples had the functional groups of Fe<SUP>3+</SUP>-O<SUP>2−</SUP>, Fe<SUP>2+</SUP>-O<SUP>2−</SUP> and OH and exhibited the superparamagnetic character. The antibacterial activity of the Fe₃O₄ nanoparticles showed a significant outcome to pathogen growth rate. Pre-administration of bacterial stock solution (E. coli and B. substilis) with magnetite significantly reduced the colony formation compared to control group. In particular, for Gram-negative bacteria growth rate, pretreatment with magnetite declined the colony formation considerably compared to placebo and positive control group. Also, in line with Gram-negative bacteria, the similar pattern of the bacterial killing property was observed in Gram-positive bacteria.
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