OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Surface pre-coating of talc particles by carboxyl methyl cellulose adsorption : study of adsorption and consequences on surface properties and settling rate

Bacchin, Patrice and Bonino, Jean-Pierre and Martin, François and Combacau, Marylène and Barthes, Patrick and Petit, Sabine and Ferret, Jocelyne Surface pre-coating of talc particles by carboxyl methyl cellulose adsorption : study of adsorption and consequences on surface properties and settling rate. (2006) Colloids and Surfaces A , vol. 2 (n°3). pp. 211-219. ISSN 0927-7757

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
624kB

Official URL: http://dx.doi.org/10.1016/j.colsurfa.2005.07.026

Abstract

This paper investigates the adsorption of different sized carboxyl methyl cellulose (CMC) onto talc particles (adsorption isotherm, adsorption reversibility), its consequences on the particles properties (electrophoretic mobility and surface wetting) and its effect on their dispersion (settling coefficient). Throughout the paper, the properties of talc particles dispersed in CMC solution are compared to CMC pre-coated talc particles: talc particles dried in a solution of CMC before their redispersion. The adsorption of CMC onto talc was quantified at around 0.4 mg of CMC per m2 of talc and was seen to be irreversible on washing the talc particles with distilled water. When characterising talc surface properties, it was found that CMC adsorption leads to an increase of the negative surface charge and to an increase of the wettability. The settling velocity of CMC pre-coated talc particles in water can be around 50 % lower than that of the initial talc particles. The pre-coating of talc particles by CMC is then assumed to increase their stabilization : particle aggregation is hindered by adsorbed CMC layer inducing electrosteric repulsion between the talc particles. The technique of talc pre-coating with CMC makes the talc dispersion easier and could open interesting perspectives in engineering processes using talc dispersions.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Colloids and Surfaces A website : http://www.sciencedirect.com/science/journal/09277757
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Luzenac Group (FRANCE)
Other partners > Université de Limoges - UNILIM (FRANCE)
Other partners > Université de Poitiers (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
Statistics:download
Deposited By: Hélène Dubernard

Repository Staff Only: item control page