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Small angle X-ray scattering study of microstructure changes of organic hydrogels from supercritical carbon dioxide drying
Zhang, R; Xu, Y; Meng, QH; Zhan, L; Li, KX; Wu, D; Ling, LC; Wang, J; Zhao, H; Dong, BZ; Wang J(王俊); Zhao H(赵辉); Dong BZ(董宝中)
2004
发表期刊JOURNAL OF SUPERCRITICAL FLUIDS
卷号28期号:2-3页码:#REF!
通讯作者Ling, LC (reprint author), Chinese Acad Sci, Key Lab Carbon Mat, Inst Coal Chem, POB 165, Taiyuan 030001, Peoples R China.
文章类型Article
摘要Hydrogels (HG) were prepared by the sol-gel polymerization of phenolic resole, m-cresol resole and methylolated melamine mixtures with different recipes in basic aqueous solution at 85 degreesC for 5 days. Water in the HG was displaced by acetone to obtain acetone gels (AG). Organic aerogels (OA) were obtained by drying of AG under supercritical carbon dioxide. Small angle X-ray scattering (SAXS) using synchrotron radiation as X-ray source was employed to investigate microstructure of HG, AG and OA. It is found that physical cross-linking is dominant in HG and supercritical drying of the physically dominant cross-linked gels cause the following microstructure changes: (1) random growth of large scatterers that "bury" the scattering peak; (2) shrinking of gels; (3) deswelling of gel network and (4) evolution of gel structure from tangled or rough interface to smooth or flat interface. (C) 2003 Elsevier B.V. All rights reserved.
关键词organic aerogels supercritical carbon dioxide drying small angle X-ray scattering positive deviation from Porod's law
学科领域Chemistry; Engineering
DOI10.1016/S0896-8446(03)00041-X
收录类别SCI
WOS类目Chemistry, Physical ; Engineering, Chemical
WOS记录号WOS:000220079800010
引用统计
被引频次:7[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/311005/227280
专题多学科研究中心
推荐引用方式
GB/T 7714
Zhang, R,Xu, Y,Meng, QH,et al. Small angle X-ray scattering study of microstructure changes of organic hydrogels from supercritical carbon dioxide drying[J]. JOURNAL OF SUPERCRITICAL FLUIDS,2004,28(2-3):#REF!.
APA Zhang, R.,Xu, Y.,Meng, QH.,Zhan, L.,Li, KX.,...&董宝中.(2004).Small angle X-ray scattering study of microstructure changes of organic hydrogels from supercritical carbon dioxide drying.JOURNAL OF SUPERCRITICAL FLUIDS,28(2-3),#REF!.
MLA Zhang, R,et al."Small angle X-ray scattering study of microstructure changes of organic hydrogels from supercritical carbon dioxide drying".JOURNAL OF SUPERCRITICAL FLUIDS 28.2-3(2004):#REF!.
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