An assessment of the surface properties of milled attapulgite using inverse gas chromatography
Boudriche, L. (Faculté de Chimie. Laboratiore d'Etude Physico-Chimique des Matériaux et Application á l'Environnement)
Hamadi, B. (Laboratiore d'Etude Physico-Chimique des Matériaux et Application á l'Environnement. Faculté de Chimie)
Kessaïssia, Z. (Laboratiore d'Etude Physico-Chimique des Matériaux et Application á l'Environnement. Faculté de Chimie)
Calvet, R. (Campus Jarlard. Ecole des Mines d'Albi Carmaux)
Chamayou, A. (Campus Jarlard. Ecole des Mines d'Albi Carmaux)
Dodds, J. A. (Campus Jarlard. Ecole des Mines d'Albi Carmaux)
Balard, H. (Laboratoire de Chimie Physique)

Fecha:	2010
Resumen:	The most common means of reducing theparticlesizeof solids is by grinding, a process which can affect the surface properties and the behavior of the solid in later stages (granulation, compaction, etc. ), and which can influence the end-use properties of the final product. Inverse gas chromatography (IGC) measurements were used here to evaluate the influence of grinding, in a ball mill, on attapulgite. The milling experiments were performed in dry media for various periods. After 30 min of grinding, significant decreases in the particle size and specific surface areas were observed when calculated using different probes. No noticeable variation in the surface properties was observed by IGC either at infinite dilution or at finite concentration, however. In particular, the distribution functions of the adsorption energies (DFAE), giving information about thesurfac ehe terogeneity for both an apolar probe(octane) and a polar probe (isopropanol), remained unchanged, regardless of the grinding time. The stability of the surface energy with respect to the grinding process was seen to be related to the particular fibrous structure of the attapulgite clay.
Derechos:	Tots els drets reservats.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Adsorption Energy Distribution Functions ; Attapulgite ; Grinding ; Inverse Gas Chromatography ; Palygorskite ; Surface Properties
Publicado en:	Clays and Clay Minerals, Vol. 58, Núm. 2 (2010) , p. 143-153, ISSN 1552-8367

DOI: 10.1346/CCMN.2010.0580201

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