Stratification of mixtures in evaporating liquid films occurs only for a range of volume fractions of the smaller component

Sear, Richard (2018) Stratification of mixtures in evaporating liquid films occurs only for a range of volume fractions of the smaller component Journal of Chemical Physics, 148 (13), 134909. 134909-1 - 134909-7.

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Abstract

I model the drying of a liquid film containing small and big colloid particles. Fortini et al. [A. Fortini et al, Phys. Rev. Lett. 116, 118301 (2016)] studied these films with both computer simulation and experiment. They found that at the end of drying the mixture had stratified with a layer of the smaller particles on top of the big particles. I develop a simple model for this process. The model has two ingredients: arrest of the diffusion of the particles at high density, and diffusiophoretic motion of the big particles due to gradients in the concentration of the small particles. The model predicts that stratification only occurs over a range of initial concentrations of the smaller colloidal species. At concentrations that are either too low or too high, the concentration gradients due to drying are not enough to push the big particles away and so produce a layer at the top of only small particles. In agreement with earlier work, the model also predicts that large Peclet numbers for drying are needed to see stratification.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Physics
Authors :	Name Email ORCID Sear, Richard R.Sear@surrey.ac.uk
Date :	5 April 2018
DOI :	10.1063/1.5022243
Copyright Disclaimer :	Copyright 2018 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. This article appeared in Journal of Chemical Physics, as 'Stratification of mixtures in evaporating liquid films occurs only for a range of volume fractions of the smaller component', Sear,Richard P., 148:13, 134909, available at https://doi.org/10.1063/1.5022243
Depositing User :	Clive Harris
Date Deposited :	19 Mar 2018 22:55
Last Modified :	23 Jul 2019 13:20
URI:	http://epubs.surrey.ac.uk/id/eprint/846047

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