Density fluctuation in silica-PVA hybrid gels determined by small-angle X-ray scattering
Xu, Y; Li, ZH; Fan, WH; Wu, D; Sun, YH; Rong, LX; Dong, BZ; Dong BZ(董宝中)
刊名APPLIED SURFACE SCIENCE
2004
卷号225期号:1-4页码:#REF!
关键词density fluctuation SAXS silica sol-gel
学科分类Chemistry; Materials Science; Physics
DOI10.1016/j.apsusc.2003.09.041
通讯作者Sun, YH (reprint author), Chinese Acad Sci, State Key Lab Coal Convers, Taoyuan Nan Rd 27, Taiyuan 030001, Peoples R China.
文章类型Article
英文摘要A series of silica-polyvinyl alcohol (PVA) hybrids were prepared by acid-catalyzed hydrolysis of tetraethoxysilane (TEOS) in the mixture of ethanol and water containing dissolved polyvinyl alcohol via a sol-gel process. A small-angle X-ray scattering (SAXS) study on those hybrid gels has been performed utilizing synchrotron radiation. Intensive positive deviation from Porod's law indicated that there existed density fluctuation within the matrix of silica-PVA hybrid gel. Using the differential d[q(3)I(q)]/ d(q(2)) as a variant slo, plotting ln(slo) versus ln(q) can produce the dimension n and the amplitude F-1 of density fluctuation. Density fluctuation resulted from both the micropores in gel and Si-O-PVA-O-Si bridge between SiO2 particle and PVA chain. When PVA increased in gel, the decreased micropores reduced the fluctuation but PVA enhanced the fluctuation. With the conjunction of correlation function C(r), it was clear that the bridge of Si-O-PVA-O-Si enlarged the compositional heterogeneity within gel matrix and made n increase with the increase of PVA. In addition, the fluctuation dimension n is a fraction rather than an integer that was formerly predicted by Ruland, which may relate to the fractal structure of hybrid gel. (C) 2003 Elsevier B.V. All rights reserved.
类目[WOS]Chemistry, Physical ; Materials Science, Coatings & Films ; Physics, Applied ; Physics, Condensed Matter
收录类别SCI
WOS记录号WOS:000220116500014
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被引频次:31[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226263
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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Xu, Y,Li, ZH,Fan, WH,et al. Density fluctuation in silica-PVA hybrid gels determined by small-angle X-ray scattering[J]. APPLIED SURFACE SCIENCE,2004,225(1-4):#REF!.
APA Xu, Y.,Li, ZH.,Fan, WH.,Wu, D.,Sun, YH.,...&董宝中.(2004).Density fluctuation in silica-PVA hybrid gels determined by small-angle X-ray scattering.APPLIED SURFACE SCIENCE,225(1-4),#REF!.
MLA Xu, Y,et al."Density fluctuation in silica-PVA hybrid gels determined by small-angle X-ray scattering".APPLIED SURFACE SCIENCE 225.1-4(2004):#REF!.
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