Density fluctuation in silica-PVA hybrid gels determined by small-angle X-ray scattering
文献类型：期刊论文
| 作者 | Xu, Y; Li, ZH; Fan, WH; Wu, D; Sun, YH; Rong, LX; Dong, BZ; Dong BZ(董宝中) |
| 刊名 | APPLIED SURFACE SCIENCE
 |
| 出版日期 | 2004 |
| 卷号 | 225期号:1-4页码:#REF! |
| 关键词 | density fluctuation SAXS silica sol-gel |
| 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. |
| 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. |
| 学科主题 | Chemistry; Materials Science; Physics |
| 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 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/226263]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 推荐引用方式 GB/T 7714 | 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!. |
入库方式： OAI收割
来源：高能物理研究所
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