Formation of Shear Bands in Drying Colloidal Dispersions

Physical Review Letters
Pree-Cha Kiatkirakajorn, Lucas Goehring

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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Citations

Apr 5, 2017·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Lucas GoehringPree-Cha Kiatkirakajorn
Feb 20, 2019·Physical Review. E·Xiaolei MaJustin C Burton
Sep 24, 2020·Soft Matter·Abdulkadir OsmanNima Shokri
Feb 9, 2019·Soft Matter·Anne Bouchaudy, Jean-Baptiste Salmon
Oct 4, 2020·The European Physical Journal. E, Soft Matter·Weipeng MengC Q Chen
Jun 6, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Zhimin JiangJames H Pikul
Dec 19, 2018·ACS Applied Materials & Interfaces·Bhaskar DasMallar Ray

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