6533b82bfe1ef96bd128ce80

RESEARCH PRODUCT

Adsorption equilibria of water vapor on cork.

David ChassagneLaurent BrachaisSonia LequinRégis D. GougeonThomas KarbowiakJean-pierre Bellat

subject

02 engineering and technologyCalorimetryCorkengineering.material010402 general chemistry01 natural sciencesQuercusAdsorptionmedicineComputingMilieux_MISCELLANEOUSChemistryWaterGeneral Chemistry021001 nanoscience & nanotechnology0104 chemical sciencesThermogravimetryHysteresis[ PHYS.PHYS.PHYS-CHEM-PH ] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]Solid-state nuclear magnetic resonanceChemical engineeringengineeringPlant BarkPhysical chemistryThermodynamics[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]AdsorptionSwellingmedicine.symptom0210 nano-technologyGeneral Agricultural and Biological SciencesCorkWater vapor

description

International audience; 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.

10.1021/jf9039364https://pubmed.ncbi.nlm.nih.gov/20192215