title: Adsorption equilibria of water vapor on cork.
abstract: We report here for the first time a complete thermodynamic study of water vapor adsorption on crude cork powder and plate. Adsorption-desorption isotherms were accurately measured by thermogravimetry at 283, 298, and 313 K in a large range of relative pressure. Adsorption enthalpies were determined by calorimetry as a function of loading. Adsorption-desorption isotherms exhibit a hysteresis due to the swelling of the material. The influence of the presence of lenticels on the adsorption properties of cork is found to be negligible. A detailed analysis and interpretation of adsorption data allow proposal of an adsorption mechanism in two steps. (i) First, water adsorbs on hydrophilic sites constituted by hydroxyl and methoxyl groups. (ii) Then water adsorption continues by clusters formation around the hydrophilic sites.
authors.affiliation: Institut Universitaire de la Vigne et du Vin, Institut Jules Guyot, 1 Rue Claude Ladrey, Universite de Bourgogne, Dijon, France.
authors.forename: Sonia
authors.initials: S
authors.lastname: Lequin
authors.forename: David
authors.initials: D
authors.lastname: Chassagne
authors.forename: Thomas
authors.initials: T
authors.lastname: Karbowiak
authors.forename: Régis
authors.initials: R
authors.lastname: Gougeon
authors.forename: Laurent
authors.initials: L
authors.lastname: Brachais
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Bellat
mesh_terms: D000327:Adsorption; D024301:Plant Bark / Q000737:chemistry*; D029963:Quercus / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water