Solidification and ordering during directional drying of a colloidal dispersion

Goehring, L. ORCID: 0000-0002-3858-7295, Clegg, W.J. and Routh, A.F., 2010. Solidification and ordering during directional drying of a colloidal dispersion. Langmuir, 26 (12), pp. 9269-9275. ISSN 0743-7463

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During drying, colloidal dispersions undergo processes such as solidi cation, cracking, and the raining f interstitial pores. Here we show that the solidication of polystyrene and silica dispersions, during directional drying, occurs in two separate stages. These correspond to the initial ordering, and subsequent aggregation, of the colloidal particles. Transitions between these stages are observed as changes in transparency and color that propagate as distinct fronts along the drying layer. The dynamics of these fronts are shown to arise from a balance between compressive capillary forces, and the electrostatic and van der Waals forces described by DLVO theory. This suggests a simple method by which the maximum inter-particle repulsion between particles can be measured through the optical inspection of the dynamics of a drying dispersion, under a microscope.

Item Type: Journal article
Publication Title: Langmuir
Creators: Goehring, L., Clegg, W.J. and Routh, A.F.
Publisher: American Chemical Society
Date: 15 June 2010
Volume: 26
Number: 12
ISSN: 0743-7463
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 06 Sep 2016 10:57
Last Modified: 16 Oct 2017 14:52

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