Topic
Silanol
About: Silanol is a research topic. Over the lifetime, 4661 publications have been published within this topic receiving 109680 citations. The topic is also known as: hydroxysilane.
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1,992 citations
TL;DR: Increased utilization of mechanically stable synthetic matrices particularly silica gel as a solid support and its surface modification by impregnation of organic ligands directly or covalent grafting through spacer unit for extractive concentration of trace elements are highlighted in the present article.
860 citations
TL;DR: In this article, a comprehensive study was conducted on mesoporous MCM-41 and it was shown that three types of silanol groups, i.e., single, (SiO)3Si−OH, hydrogen-bonded, and geminal silanols, can be observed.
Abstract: A comprehensive study was conducted on mesoporous MCM-41. Spectroscopic examinations demonstrated that three types of silanol groups, i.e., single, (SiO)3Si−OH, hydrogen-bonded, (SiO)3Si−OH-OH−Si(SiO)3, and geminal, (SiO)2Si(OH)2, can be observed. The number of silanol groups/nm2, αOH, as determined by NMR, varies between 2.5 and 3.0 depending on the template-removal methods. All these silanol groups were found to be the active sites for adsorption of pyridine with desorption energies of 91.4 and 52.2 kJ mol-1, respectively. However, only free silanol groups (involving single and geminal silanols) are highly accessible to the silylating agent, chlorotrimethylsilane. Silylation can modify both the physical and chemical properties of MCM-41.
653 citations
TL;DR: In this paper, a review of the current state of knowledge on silica surface chemistry and the impact of the chemistry on chromatography of basic solutes is discussed, and the influence of the silica surfaces on the stability of bonded phases is also described.
651 citations
Book•
09 May 1995
TL;DR: In this article, the authors describe the physical characterization of the silica surface and the surface chemistry of silica, as well as the surface morphology of the surface and its properties.
Abstract: Part 1 The silica surface: silica - preparation and properties physical characterization of the silica surface the surface chemistry of silica quantification of the silanol number the distribution of the silanol types and their desorption energies the effect of surface morphology on the dehydroxylation behaviour related materials - silicates Part 2 Chemical modification of the silica surface: chemical modification of silica - applications and procedures modification with silicon compounds mechanistic studies modification with boron compounds modification with other compounds ammoniation of modified silica - introduction of functional groups Part 3 Chemical surface coating: coating techniques chemical surface coating Appendices - surface analysis techniques: FTIR-PAS, fourier transform infrared spectroscopy with photoacoustic detection XPS, X-Ray photoelectron spectroscopy 29Si CP MAS NMR, Cross polarization magic angle spinning nuclear magnetic resonance surface science techniques
642 citations