Jump to main content
Jump to site search

Issue 32, 2012
Previous Article Next Article

Effect of a non-volatile cosolvent on crack patterns induced by desiccation of a colloidal gel

Author affiliations

Abstract

The consolidation of colloidal gels results in enormous stresses that are usually released by the formation of undesirable cracks. The capacity of a gel network to crack during drying depends on the existence and significance of a pressure gradient in the pore liquid; in addition it depends on the way the gel relaxes the resulting drying stresses. In this paper the effect of a binary mixture of solvents saturating the gel network on the crack patterns formation is investigated. Indeed, incorporation of a small quantity of non-volatile cosolvent, i.e. glycerol, inhibits drying-induced cracks; moreover addition of a concentration greater than 10% to a colloidal dispersion leads to a crack free coating under room conditions. Mass variation with time reveals that both evaporation rate and cracking time are not affected by glycerol, in the range of added glycerol contents studied. In addition measurements of mechanical properties show that the elastic modulus is reduced with glycerol content. The decrease of the number of cracks with the glycerol content is related to the flattening of the pressure gradient in the pore liquid. The mechanism is shown to be due to the combination of two processes: flow driven by the pressure gradient and diffusion mechanisms in accordance with Scherer's work (1989).

Graphical abstract: Effect of a non-volatile cosolvent on crack patterns induced by desiccation of a colloidal gel

Back to tab navigation

Publication details

The article was received on 22 Mar 2012, accepted on 07 Jun 2012 and first published on 06 Jul 2012


Article type: Paper
DOI: 10.1039/C2SM25663K
Citation: Soft Matter, 2012,8, 8505-8510
  •   Request permissions

    Effect of a non-volatile cosolvent on crack patterns induced by desiccation of a colloidal gel

    F. Boulogne, L. Pauchard and F. Giorgiutti-Dauphiné, Soft Matter, 2012, 8, 8505
    DOI: 10.1039/C2SM25663K

Search articles by author

Spotlight

Advertisements