PMID: 8970108Jan 1, 1996Paper

High-resolution 29Si solid-state NMR study of silicon functionality distribution on the surface of silicas

Magnetic Resonance Imaging
M LuhmerA P Legrand

Abstract

29Si solid-state NMR allows us to distinguish silicon atoms involved in siloxane bridges (Q4), single silanol (Q3) and geminal silanol groups (Q2) on the surface of silica. The relative proportions of each species can be obtained by Magic Angle Spinning (MAS) associated with 1H-->29Si crosspolarization (CP/MAS). This preliminary study deals with the silicon functionality of MCM-41, a purely siliceous, amorphous and mesoporous silica. From the 29Si spectra the relative proportions are estimated to be 3.7% Q2 27.3% Q3 and 69.0% Q4, while the ratio Q2/Q2 + Q3) is 0.12. These results are found to be in perfect agreement with a binomial probability distribution of sites.

Citations

Jun 4, 1999·Trends in Microbiology·B P Rosen
Apr 15, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Xu LiHongchen Gu
Dec 24, 2011·Solid State Nuclear Magnetic Resonance·M VijayakumarJianzhi Hu
May 31, 2013·Journal of Separation Science·Bohuslav Rittich, Alena Spanová
Dec 21, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Xu LiHongchen Gu
May 4, 2017·Chemistry : a European Journal·Martino RimoldiOmar K Farha
Jan 1, 2010·Journal of Materials Chemistry·Yongquan QuXiangfeng Duan
May 5, 2018·Physical Chemistry Chemical Physics : PCCP·Brecht VallaeyJohan A Martens
Nov 23, 2018·Journal of Colloid and Interface Science·James FlynnSarah P Hudson
Feb 6, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Peiguang HuShaowei Chen

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