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  Drying paint: From micro-scale dynamics to mechanical instabilities

Goehring, L., Li, J., & Kiatkirakajorn, P.-C. (2017). Drying paint: From micro-scale dynamics to mechanical instabilities. Philosophical Transactions of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences, 375(2093): 20160161. doi:10.1098/rsta.2016.0161.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-E911-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-22DB-2
Genre: Journal Article

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 Creators:
Goehring, Lucas1, Author              
Li, Joaquim1, Author              
Kiatkirakajorn, Pree-Cha1, 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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Free keywords: colloids, small-angle X-ray scattering, drying, solidification, fracture, shear bands
 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 summarize 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 in 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.This article is part of the themed issue ‘Patterning through instabilities in complex media: theory and applications.’

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Language(s): eng - English
 Dates: 2017-04-032017-05-13
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1098/rsta.2016.0161
 Degree: -

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Title: Philosophical Transactions of the Royal Society of London, Series A : Mathematical, Physical and Engineering Sciences
Source Genre: Journal
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Publ. Info: -
Pages: 21 Volume / Issue: 375 (2093) Sequence Number: 20160161 Start / End Page: - Identifier: -