Dissolution of a surfactant-containing active porous material

We have studied the imbibition and dissolution of a porous material in two separate scenarios: (1) when the porous material contains a surfactant powder and (2) when the porous material is dissolved in a surfactant solution. We show that the dissolution kinetics in both scenarios is significantly af...

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Bibliographic Details
Published in:Journal of colloid and interface science 2008-12, Vol.328 (2), p.344-352
Main Authors: Brielles, Nelly, Chantraine, Florence, Viana, Marylène, Chulia, Dominique, Branlard, Paul, Rubinstenn, Gilles, Lequeux, François, Mondain-Monval, Olivier
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry
Colloidal state and disperse state
Condensed Matter
Exact sciences and technology
General and physical chemistry
Materials Science
Physics
Polymers
Porous materials
Powder materials
Surface physical chemistry
Surfactant solutions
Wetting properties
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Summary:We have studied the imbibition and dissolution of a porous material in two separate scenarios: (1) when the porous material contains a surfactant powder and (2) when the porous material is dissolved in a surfactant solution. We show that the dissolution kinetics in both scenarios is significantly affected by the presence of the surfactant and results in an increase in the characteristic imbibition time of the porous material, which can be well understood in the framework of the classical law of capillarity. Slowing of the imbibition kinetics was found to be affected by a modification of the liquid wetting properties, but is also affected by a variation in the solubility of the porous material in the presence of the surfactant. Furthermore, there is a depletion effect of the surfactant inside the rising liquid, which is in good agreement with previous work and theoretical predictions. (a) Scheme of the set-up used to measure the imbibition of a tablet from the bottom. (b) Enlighted tablet: the wetted part looks whiter.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2008.07.060