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Ammonia catalyzed hydrolysis-condensation kinetics of tetraethoxysilane/dimethyldiethoxysilane mixtures studied by Si-29 NMR and SAXS
Xu, Y; Sun, XY; Wu, D; Sun, YH; Yang, YX; Yuan, HZ; Deng, F; Wu, ZH; Wu ZH(吴忠华)
2007
发表期刊JOURNAL OF SOLUTION CHEMISTRY
卷号36期号:3页码:327-344
通讯作者Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Peoples R China ; Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Lab Synchrotron Radiat, Beijing 100039, Peoples R China
文章类型Article
摘要In-situ Si-29 liquid-state nuclear magnetic resonance (NMR) was used to investigate the ammonia catalyzed hydrolysis and condensation of the mixed systems of tetraethoxysilane (TEOS) and dimethyldiethoxysilane (DDS) dissolved in methanol. With ammonia catalysis, the hydrolysis reaction orders for TEOS and DDS in the mixed systems remained first order, which is similar to that observed for their corresponding single silane component precursor systems. The hydrolysis rate constant for TEOS in the mixed systems was larger than that of TEOS in the single silane component precursor systems. Meanwhile, the hydrolysis rate constants of DDS in the mixed precursor systems were smaller than those of DDS in the single silane component precursor systems. The hydrolysis and condensation kinetics showed more compatible hydrolysis-condensation relative rates between TEOS and DDS, which remarkably affected the final microstructure of the resulting silica particles. Small angle X-ray scattering (SAXS) experiments showed a typical double fractal structure in the particulate networks.
关键词reaction kinetics Si-29 NMR hydrolysis condensation small angle X-ray scattering tetraethoxysilane (TEOS) dimethyldiethoxysilane (DDS)
学科领域Chemistry
研究领域[WOS]Chemistry ; Chemistry
DOI10.1007/s10953-006-9117-y
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语种英语
研究领域[WOS]Chemistry ; Chemistry
WOS类目Chemistry, Physical
WOS记录号WOS:000245363100005
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被引频次:16[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/311005/236995
专题多学科研究中心
作者单位中国科学院高能物理研究所
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Xu, Y,Sun, XY,Wu, D,et al. Ammonia catalyzed hydrolysis-condensation kinetics of tetraethoxysilane/dimethyldiethoxysilane mixtures studied by Si-29 NMR and SAXS[J]. JOURNAL OF SOLUTION CHEMISTRY,2007,36(3):327-344.
APA Xu, Y.,Sun, XY.,Wu, D.,Sun, YH.,Yang, YX.,...&吴忠华.(2007).Ammonia catalyzed hydrolysis-condensation kinetics of tetraethoxysilane/dimethyldiethoxysilane mixtures studied by Si-29 NMR and SAXS.JOURNAL OF SOLUTION CHEMISTRY,36(3),327-344.
MLA Xu, Y,et al."Ammonia catalyzed hydrolysis-condensation kinetics of tetraethoxysilane/dimethyldiethoxysilane mixtures studied by Si-29 NMR and SAXS".JOURNAL OF SOLUTION CHEMISTRY 36.3(2007):327-344.
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