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	Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane
	Yuan, Peng ; Yang, Dan ; Lin, Zhongyu ; Lin ZY(林种玉) ; He, Hongping ; Wen, Xiaoyan ; Wang, Linjiang ; Deng, Feng
	2006-08
关键词	geology and archeology FTIR measurements silica NMR MAS-NMR and NQR surfaces and interfaces thermal properties water
英文摘要	Diatomaceous amorphous silica samples were modified by silylation using trimethylehlorosilane (TMCS). The resultant materials were characterized by using thermogravimetry (TG), H-1 magic-angle spinning nuclear magnetic resonance (H-1 MAS NMR), Fourier transform infrared spectroscopy (FTIR) and chemical analysis. The degree of silylation was found to increase with the increasing temperature of thermal pretreatment on diatomaceous silica prior to silylation. Increment of the pretreated temperature leads to stepwise removal of physisorbed water followed by the dehydration of capping water that H-bonded with the surface silanols, resulting in exposure of more and more isolated and H-bonded silanols previously covered by water molecules. Among these exposed silanols, isolated silanols show high activity for silylation reaction but H-bonded ones show poor activity. The maximum degree of surface attachment of TMCS grafted onto the diatomaceous silica (about 1.81 mmol TMCS groups per gram of silica) was shown in the sample pretreated at 1100 degrees C, in which the amount of exposed isolated silanols get the maximum. The fundamental information derived from this work is of significance in well understanding the surface silylation reaction of diatomaceous silica and providing useful information for related industrial production. (c) 2006 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.jnoncrysol.2006.05.035]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Yuan, Peng,Yang, Dan,Lin, Zhongyu,et al. Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane[J],2006.
APA	Yuan, Peng.,Yang, Dan.,Lin, Zhongyu.,林种玉.,He, Hongping.,...&Deng, Feng.(2006).Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane..
MLA	Yuan, Peng,et al."Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane".(2006).

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