Drying paint: from micro-scale dynamics to mechanical instabilities

Goehring, L. ORCID: 0000-0002-3858-7295, Li, J. and Kiatkirakajorn, P.C., 2017. Drying paint: from micro-scale dynamics to mechanical instabilities. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 375 (2093), p. 20160161. ISSN 1364-503X

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Abstract

Charged colloidal dispersions make up the basis of a broad range of industrial and commercial products, from paints to coatings and additives in cosmetics. During drying, an initially liquid dispersion of such particles is slowly concentrated into a solid, displaying a range of mechanical instabilities in response to highly variable internal pressures. Here we summarise the current appreciation of this process by pairing an advection-diffusion model of particle motion with a Poisson-Boltzmann cell model of inter-particle interactions, to predict the concentration gradients around a drying colloidal film. We then test these predictions with osmotic compression experiments on colloidal silica, and small-angle x-ray scattering experiments on silica dispersions drying in Hele-Shaw cells. Finally, we use the details of the microscopic physics at play in these dispersions to explore how two macroscopic mechanical instabilities – shear-banding and fracture – can be controlled.

Item Type: Journal article
Publication Title: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Creators: Goehring, L., Li, J. and Kiatkirakajorn, P.C.
Publisher: The Royal Society Publishing
Date: 3 April 2017
Volume: 375
Number: 2093
ISSN: 1364-503X
Identifiers:
NumberType
10.1098/rsta.2016.0161UNSPECIFIED
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 08 Mar 2017 09:11
Last Modified: 09 Jun 2017 14:13
URI: http://irep.ntu.ac.uk/id/eprint/30319

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