Ammonia-catalyzed hydrolysis kinetics of mixture of tetraethoxysilane with methyltriethoxysilane by Si-29 NMR

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 2011年以前论文发表（包括2011年）

	Ammonia-catalyzed hydrolysis kinetics of mixture of tetraethoxysilane with methyltriethoxysilane by Si-29 NMR
	Xu, Y ; Liu, RL ; Wu, D ; Sun, YH ; Gao, HC ; Yuan, HZ ; Deng, F
刊名	JOURNAL OF NON-CRYSTALLINE SOLIDS
	2005-09-01
卷号	351 期号:30-32 页码:2403-2413
英文摘要	In situ liquid Si-29 NMR was used to investigate the ammonia-catalyzed hydrolysis and condensation of tetraethoxysilane (TEOS) and methyltriethoxysitane (MTES) mixed systems with methanol as solvent. Varying the molar ratio of TEOS, MTES, water and ammonia in original solution, the initial hydrolysis rate constants of TEOS and MTES were calculated as well as the corresponding reactive orders. Under ammonia catalysis, the hydrolysis of TEOS and MTES in mixed system all retained the first-order reaction, similar to the cases of their individual systems. The hydrolysis rate constant of TEOS in mixed system is larger than that in its single system. Meanwhile, the hydrolysis rate constant of MTES in mixed system was smaller than that in its single system. Furthermore the condensation rate constants of TEOS and MTES in mixed system all decreased when compared to the individual condensation rate constants of MTES and TEOS. Another important result was: the reactive orders of both ammonia and water increased to different extent for TEOS and MTES in mixed system. Hydrolysis kinetics shows more compatible hydrolysis-condensation relative rates between TEOS and MTES. Assisted by the solid Si-29 MAS NMR and XPS, the obtained hybrid gel showed weak cross-condensation between TEOS and MTES. With the small angle X-ray scattering (SAXS), the double fractal structure in particulate networks was disclosed to be resulted from the more compatible hydrolysis-condensation relative rates between TEOS and MTES. (c) 2005 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Materials Science, Ceramics ; Materials Science, Multidisciplinary
研究领域[WOS]	Materials Science
关键词[WOS]	SOL-GEL PROCESS ; X-RAY-SCATTERING ; INITIAL POLYCONDENSATION PROCESSES ; MODIFIED SILICA SOLS ; 2 FRACTAL STRUCTURES ; SUBSTITUTED ETHOXYSILANES ; OPTICAL-PROPERTIES ; STEADY-STATE ; THIN-FILMS ; SAXS
收录类别	SCI
语种	英语
WOS记录号	WOS:000231930800007
公开日期	2015-07-28
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/4571]
专题	武汉物理与数学研究所_2011年以前论文发表（包括2011年）
作者单位	1.Chinese Acad Sci, Inst Coal Chem, State Key Lab Coal Convers, Taiyuan 030001, Shanxi, Peoples R China 2.Chinese Acad Sci, Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Xu, Y,Liu, RL,Wu, D,et al. Ammonia-catalyzed hydrolysis kinetics of mixture of tetraethoxysilane with methyltriethoxysilane by Si-29 NMR[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2005,351(30-32):2403-2413.
APA	Xu, Y.,Liu, RL.,Wu, D.,Sun, YH.,Gao, HC.,...&Deng, F.(2005).Ammonia-catalyzed hydrolysis kinetics of mixture of tetraethoxysilane with methyltriethoxysilane by Si-29 NMR.JOURNAL OF NON-CRYSTALLINE SOLIDS,351(30-32),2403-2413.
MLA	Xu, Y,et al."Ammonia-catalyzed hydrolysis kinetics of mixture of tetraethoxysilane with methyltriethoxysilane by Si-29 NMR".JOURNAL OF NON-CRYSTALLINE SOLIDS 351.30-32(2005):2403-2413.