Drying paint: from micro-scale dynamics to mechanical instabilities

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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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Official URL: http://doi.org/10.1098/rsta.2016.0161

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