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A Critical and Quantitative Review of the Stratification of Particles during the Drying of Colloidal Films

Schulz, M. and Keddie, J.L. (2018) A Critical and Quantitative Review of the Stratification of Particles during the Drying of Colloidal Films Soft Matter, 14. pp. 6181-6197.

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A Critical and Quantitative Review of the Stratification of Particles during the Drying of Colloidal Films - Accepted version.pdf - Accepted version Manuscript
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Abstract

For a wide range of applications, films are deposited from colloidal particles suspended in a volatile liquid. There is burgeoning interest in stratifying colloidal particles into separate layers within the final dry film to impart properties at the surface different to the interior. Here, we outline the mechanisms by which colloidal mixtures can stratify during the drying process. The problem is considered here as a three-way competition between evaporation of the continuous liquid, sedimentation of particles, and their Brownian diffusion. In particle mixtures, the sedimentation of larger or denser particles offers one means of stratification. When the rate of evaporation is fast relative to diffusion, binary mixtures of large and small particles can stratify with small particles on the top, according to physical models and computer simulations. We compare experimental results found in the scientific literature to the predictions of several recent models in a quantitative way. Although there is not perfect agreement between them, some general trends emerge in the experiments, simulations and models. The stratification of small particles on the top of a film is favoured when the colloidal suspension is dilute but when both the concentration of the small particles and the solvent evaporation rate are sufficiently high. A higher ratio also favours stratification by size. This review points to ways that microstructures can be designed and controlled in colloidal materials to achieve desired properties.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Schulz, M.m.schulz@surrey.ac.uk
Keddie, J.L.J.Keddie@surrey.ac.uk
Date : 11 July 2018
DOI : 10.1039/C8SM01025K
Copyright Disclaimer : Copyright 2017 American Physical Society
Uncontrolled Keywords : Brownian diffusion; Evaporation; Drying; Coatings; Sedimentation; Latex; Diffusiophoresis
Related URLs :
Depositing User : Clive Harris
Date Deposited : 12 Jul 2018 10:55
Last Modified : 07 Nov 2018 16:08
URI: http://epubs.surrey.ac.uk/id/eprint/848702

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