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dc.contributor.authorYuan, Peng
dc.contributor.authorYang, Dan
dc.contributor.authorLin, Zhongyu
dc.contributor.author林种玉
dc.contributor.authorHe, Hongping
dc.contributor.authorWen, Xiaoyan
dc.contributor.authorWang, Linjiang
dc.contributor.authorDeng, Feng
dc.date.accessioned2011-07-03T02:21:34Z
dc.date.available2011-07-03T02:21:34Z
dc.date.issued2006-08
dc.identifier.citationJOURNAL OF NON-CRYSTALLINE SOLIDS,2006,352(36):3762-3771zh_CN
dc.identifier.issn0022-3093
dc.identifier.urihttp://dx.doi.org/doi:10.1016/j.jnoncrysol.2006.05.035
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/9945
dc.description.abstractDiatomaceous 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.zh_CN
dc.language.isoenzh_CN
dc.publisherELSEVIER SCIENCE BVzh_CN
dc.subjectgeology and archeologyzh_CN
dc.subjectFTIR measurementszh_CN
dc.subjectsilicazh_CN
dc.subjectNMRzh_CN
dc.subjectMAS-NMR and NQRzh_CN
dc.subjectsurfaces and interfaceszh_CN
dc.subjectthermal propertieszh_CN
dc.subjectwaterzh_CN
dc.titleInfluences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilanezh_CN
dc.typeArticlezh_CN


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