Small-Angle X-Ray Scattering Study on PVA/Fe3O4 Magnetic Hydrogels
Small-Angle X-Ray Scattering Study on PVA/Fe3O4 Magnetic Hydrogels
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DOI：
10.1142/s1793292016500272
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发表时间：
2016-03-01
期刊：
影响因子：
1.2
通讯作者：
Darminto
中科院分区：
文献类型：
--
作者：
Sunaryono;Taufiq, Ahmad;Darminto
对 PVA/Fe3O4 磁性水凝胶进行了同步加速器小角 X 射线散射 (SAXS) 研究，以研究团簇对其磁性的影响。水凝胶是通过冻融（F-T）过程制备的。分别使用 X 射线衍射 (XRD)、透射电子显微镜 (TEM) 和超导量子干涉装置 (SQUID) 磁力计研究了磁铁矿 (Fe3O4) 纳米粒子 (NP) 的结构、形貌和磁性。在本研究中，SAXS 数据用于揭示磁铁矿的结构尺寸及其在富含聚合物的 PVA 和磁性水凝胶中的分布。使用 Beaucage 和 Teubner-Strey 模型计算，PVA 水凝胶的平均结构尺寸为 3.9 nm（微晶），而微晶之间的平均距离约为 18 nm。通过应用双对数正态分布进一步分析表明，磁铁矿纳米粒子包含直径为 9.6 nm 的二次颗粒，这些颗粒由一次颗粒（类似于 3.2 nm）构成。二对数正态分布函数也已用于描述磁性水凝胶中磁铁矿纳米粒子的尺寸分布。随着 NP 磁铁矿浓度从 15 wt.% 降低到 1 wt.%，磁性水凝胶中磁铁矿 NP 簇的尺寸从 30.4 nm 显着减小到 12.8 nm。磁铁矿纳米颗粒、15%和1%磁性水凝胶的饱和磁化强度值分别为34.67 emu/g、6.52 emu/g和0.37 emu/g。
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 (similar to 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.