A simple liquid state 1H NMR measurement to directly determine the surface hydroxyl density of porous silica

C. Penrose; P. Steiner; L. F. Gladden; A. J. Sederman; A. P. E. York; M. Bentley; M. D. Mantle

doi:10.1039/D1CC03959H

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A simple liquid state ¹H NMR measurement to directly determine the surface hydroxyl density of porous silica†

C. Penrose,^a P. Steiner,^ab L. F. Gladden,^a A. J. Sederman,^a A. P. E. York,

^c M. Bentley^c and M. D. Mantle

*^a

Author affiliations

* Corresponding authors

^a Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Dr, Cambridge CB3 0AS, UK
E-mail: mdm20@cam.ac.uk
Tel: +44-1223-766325

^b Gdanska 335/23, Praha 8, Czech Republic

^c Johnson Matthey Technology Centre, Blounts Court, Sonning Common, Reading, UK

Abstract

Silica is widely used in industrial applications and its performance is partially decided by its surface hydroxyl density α_OH. Here we report a quick, simple liquid ¹H NMR method to determine α_OH using a benchtop ¹H NMR spectrometer. The results show excellent agreement with the literature with an α_OH range from 4.16 to 6.56 OH per nm².

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Article information

DOI: https://doi.org/10.1039/D1CC03959H
Article type: Communication
Submitted: 21 Jul 2021
Accepted: 09 Nov 2021
First published: 09 Nov 2021
This article is Open Access

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Chem. Commun., 2021,57, 12804-12807

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A simple liquid state ¹H NMR measurement to directly determine the surface hydroxyl density of porous silica

C. Penrose, P. Steiner, L. F. Gladden, A. J. Sederman, A. P. E. York, M. Bentley and M. D. Mantle, Chem. Commun., 2021, 57, 12804 DOI: 10.1039/D1CC03959H

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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Chemical Communications