HAL : hal-00201138, version 1

DOI : 10.1016/j.colsurfa.2005.07.026

Code IRD Horizon : PAR00007508

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 272, 3 (2006) 211-219

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

Patrice Bacchin 1, Jean-Pierre Bonino 2, François Martin 3, Marylène Combacau 1, Patrick Barthes 2, Sabine Petit 4, Jocelyne Ferret 5

(2006)

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.

1 :	Laboratoire de génie chimique (LGC)
	CNRS : UMR5503 – Université Paul Sabatier [UPS] - Toulouse III – Institut National Polytechnique de Toulouse - INPT
2 :	Centre interuniversitaire de recherche et d'ingenierie des matériaux (CIRIMAT)
	CNRS : UMR5085 – Université Paul Sabatier [UPS] - Toulouse III – Institut National Polytechnique de Toulouse - INPT
3 :	Laboratoire des Mécanismes et Transfert en Géologie (LMTG)
	CNRS : UMR5563 – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III – Institut de recherche pour le développement [IRD] : UMR154
4 :	Hydrogéologie, argiles, sols et altérations (HASA)
	CNRS : UMR6532 – INSU – Université de Limoges – Université de Poitiers – Ecole Nationale Supérieure Agronomique de Toulouse
5 :	Talc de Luzenac Europe
	Luzenac Group

Domaine

:

Sciences de l'ingénieur/Génie des procédés

Mots Clés : Talc – Dispersion – Coating – Carboxyl methyl cellulose – Adsorption – Settling – Hydrophobic – Contact angle – Wettability – Zeta potential – Aggregation

hal-00201138, version 1

http://hal.archives-ouvertes.fr/hal-00201138

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Contributeur : Patrice Bacchin <>

Soumis le : Lundi 24 Décembre 2007, 15:43:13

Dernière modification le : Lundi 31 Décembre 2007, 16:13:29