Determination of accessible silanols groups on silica gel surfaces using microcalorimetric measurements | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

1039800

Reference Type

Journal Article

Title

Determination of accessible silanols groups on silica gel surfaces using microcalorimetric measurements

Author(s)

Buszewski, B; Bocian, S; Rychlicki, G; Matyska, M; Pesek, J

Year

2012

Is Peer Reviewed?

Yes

Journal

Journal of Chromatography A
ISSN: 0021-9673
EISSN: 1873-3778

Publisher

ELSEVIER

Location

AMSTERDAM

Volume

1232

Page Numbers

43-46

Language

English

PMID

21955782

DOI

10.1016/j.chroma.2011.08.094

Web of Science Id

WOS:000302423000006

Abstract

The calorimetric measurements of methanol and hexane heats of immersion were carried out on different silica gels. Based on the difference in immersion heats, a methodology for the determination of the number of silanols on the surface is presented. The calculated concentration of residual silanols on the silica gel surface agreed with data found in the literature. The proposed methodology, based on a calculation of possible hydrogen bond formation, was also tested on the series of bonded stationary phases with different coverage densities. A very good correlation between the calculated number of accessible residual silanols and the coverage density of bonded ligands was observed.

Keywords

Solvent adsorption; Silica gel; Chemically modified silica; Accessible residual silanol; Microcalorimetry; Heat of immersion; Hydrogen bond

Conference Name

36th International Symposium on High-Performance Liquid Phase Separations and Related Techniques (HPLC)

Conference Location

Budapest, HUNGARY