Low field 1H NMR characterization of mesoporous silica MCM-41 and SBA-15 filled with different amount of water

被引：57

作者：

Krzyzak, A. T. ^{[1
]}

Habina, I. ^{[1
]}

机构：

[1] AGH Univ Sci & Technol, Al Mickiewicza 30, PL-30059 Krakow, Poland

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2016年 / 231卷

关键词：

Low field NMR; MCM-41; SBA-15; Pore size distribution; Surface relaxivity; T1-T2; maps; NMR RELAXATION; POROUS-MEDIA; QUANTIFICATION; ADSORPTION; POROSITY; LIQUIDS;

D O I：

10.1016/j.micromeso.2016.05.032

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The low field H-1 NMR characterization of pure mesoporous silica materials MCM-41 and SBA-15 as a function of water content is presented. The values of surface relaxivities for both materials were estimated in order to compare pore size distributions obtained from relaxation spectra and N-2 adsorption measurements. This comparison led to differentiation between contributions from 'inner-bulk' water molecules in pores and these from the surface. The T-1/T-2 ratio reflecting the strength of interaction between water molecules and the mesoporous silica surface was confirmed to be higher for SBA-15. Measurements for a mesopore surface partially covered by water provided quantitative information on the hydroxylation rate. (C) 2016 Elsevier Inc. All rights reserved.

引用

页码：230 / 239

页数：10

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