Jump to main content
Jump to site search

Issue 22, 2019
Previous Article Next Article

Direct observation of pore collapse and tensile stress generation on pore walls due to salt crystallization in a PDMS channel

Author affiliations

Abstract

The generation of stress on pore walls due to salt crystallization is generally analysed as a compressive stress generation mechanism using the concept of crystallization pressure. We report on a completely different stress generation mechanism. In contrast with the classical picture where the crystal pushes the pore wall, the crystal growth leads to the generation of a local tensile stress. This tensile stress occurs next to a region where a compressive stress is generated, thus inducing also shear stresses. These findings are obtained from direct optical observations in PDMS model pores where the tensile stress generation results in the collapse of the pore region located between the crystal and the pore dead-end. The experiments also reveal other interesting phenomena, such as hyperslow drying in PDMS channels or asymmetrical growth of the crystal during the collapse.

Graphical abstract: Direct observation of pore collapse and tensile stress generation on pore walls due to salt crystallization in a PDMS channel

Back to tab navigation

Supplementary files

Publication details

The article was received on 17 Dec 2018, accepted on 12 May 2019 and first published on 13 May 2019


Article type: Paper
DOI: 10.1039/C8SM02546K
Soft Matter, 2019,15, 4562-4569

  •   Request permissions

    Direct observation of pore collapse and tensile stress generation on pore walls due to salt crystallization in a PDMS channel

    A. Naillon, P. Joseph and M. Prat, Soft Matter, 2019, 15, 4562
    DOI: 10.1039/C8SM02546K

Search articles by author

Spotlight

Advertisements