• 中文
    • English
  • English 
    • 中文
    • English
  • Login
View Item 
  •   DSpace Home
  • 化学化工学院
  • 化学化工-已发表论文
  • View Item
  •   DSpace Home
  • 化学化工学院
  • 化学化工-已发表论文
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane

Thumbnail
Full Text
Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane.htm (413bytes)
Date
2006-08
Author
Yuan, Peng
Yang, Dan
Lin, Zhongyu
林种玉
He, Hongping
Wen, Xiaoyan
Wang, Linjiang
Deng, Feng
Collections
  • 化学化工-已发表论文 [14469]
Show full item record
Abstract
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.
Citation
JOURNAL OF NON-CRYSTALLINE SOLIDS,2006,352(36):3762-3771
URI
http://dx.doi.org/doi:10.1016/j.jnoncrysol.2006.05.035
https://dspace.xmu.edu.cn/handle/2288/9945

copyright © 2002-2016  Duraspace  Theme by @mire  厦门大学图书馆  
About | Policies
 

 

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

LoginRegister

copyright © 2002-2016  Duraspace  Theme by @mire  厦门大学图书馆  
About | Policies