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  Formation of shear bands in drying colloidal dispersions

Kiatkirakajorn, P.-C., & Goehring, L. (2015). Formation of shear bands in drying colloidal dispersions. Physical Review Letters, 115: 088302. doi:10.1103/PhysRevLett.115.088302.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5EEB-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-BEBC-2
Genre: Journal Article

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 Creators:
Kiatkirakajorn, Pree-Cha1, Author              
Goehring, Lucas1, Author              
Affiliations:
1Group Pattern formation in the geosciences, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063304              

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 Abstract: In directionally dried colloidal dispersions regular bands can appear behind the drying front, inclined at ±45° to the drying line. Although these features have been noted to share visual similarities with shear bands in metal, no physical mechanism for their formation has ever been suggested, until very recently. Here, through microscopy of silica and polystyrene dispersions, dried in Hele-Shaw cells, we demonstrate that the bands are indeed associated with local shear strains. We further show how the bands form, that they scale with the thickness of the drying layer, and that they are eliminated by the addition of salt to the drying dispersions. Finally, we reveal the origins of these bands in the compressive forces associated with drying, and show how they affect the optical properties (birefringence) of colloidal films and coatings.

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Language(s): eng - English
 Dates: 2015-08-182015-08-21
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevLett.115.088302
BibTex Citekey: kiatkirakajorn-prl-2015
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Title: Physical Review Letters
Source Genre: Journal
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Pages: 5 Volume / Issue: 115 Sequence Number: 088302 Start / End Page: - Identifier: ISSN: 0031-9007