Surface modification of calcium carbonate with phosphonic acids

El Malti, Wassim and Laurencin, Danielle and Guerrero, Gilles and Smith, Mark E. and Mutin, P. Hubert (2012) Surface modification of calcium carbonate with phosphonic acids. Journal of Materials Chemistry, 22 (3). pp. 1212-1218. ISSN 0959-9428

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Abstract

The surface of precipitated calcite particles was modified by reaction with phosphonic acids (phenylphosphonic acid and dodecylphosphonic acid) in organic solvents, tetrahydrofuran (THF) and ethanol. The reaction kinetics and adsorption isotherms were determined. Under appropriate conditions, dense phosphonate monolayers were deposited at the surface of the CaCO3 particles. The nature of the grafted species was investigated using 31P and 1H Magic Angle Spinning (MAS) solid state NMR spectroscopy, FTIR spectroscopy and N2 physisorption. These monolayers were found to increase the hydrophobic character of CaCO3 surfaces, especially in the case of dodecylphosphonic acid. The unwanted formation of a bulk crystalline calcium phosphonate phase by dissolution–precipitation was observed only in the reaction of phenylphosphonic acid with CaCO3 in THF, and it could be largely avoided by working at low concentration of the phosphonic acid and/or minimizing reaction times to less than 3 days.

Item Type: Journal Article
Journal or Publication Title: Journal of Materials Chemistry
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1600
Subjects:
Departments: VC's Office
ID Code: 65017
Deposited By: ep_importer_pure
Deposited On: 06 Jun 2013 10:29
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 08:12
URI: https://eprints.lancs.ac.uk/id/eprint/65017

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