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Stratification in Binary Colloidal Polymer Films from Dilute and Concentrated Suspensions: Experiment and Simulations

Makepeace, David, Fortini, Andrea, Markov, A, Locatelli, P, Lindsay, C, Moorhouse, S, Lind, R, Sear, Richard and Keddie, Joseph (2017) Stratification in Binary Colloidal Polymer Films from Dilute and Concentrated Suspensions: Experiment and Simulations Soft Matter.

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Abstract

When films are deposited from mixtures of colloidal particles of two different sizes, a diverse range of functional structures can result. One structure of particular interest is a stratified film in which the top surface layer has a composition different than in the interior. Here, we explore the conditions under which a stratified layer of small particles develops spontaneously in a colloidal film that is cast from a binary mixture of small and large polymer particles that are suspended in water. A recent model, which considers the cross-interaction between the large and small particles (Zhou et al., Phys. Rev. Lett. (2017) 118, 108002), predicts that stratification will develop from dilute binary mixtures when the particle size ratio (), initial volume fraction of small particles ( s), and Péclet number are high. In experiments and Langevin dynamics simulations, we systematically vary and s in both dilute and concentrated suspensions. We find that stratified films develop when  s is increased, which is in agreement with the model. In dilute suspensions, there is reasonable agreement between the experiments and the Zhou et al. model. In concentrated suspensions, stratification occurs in experiments only for the higher size ratio  = 7. Simulations using a high Péclet number, additionally find stratification with  = 2, when  s is high enough. Our results provide a quantitative understanding of the conditions under which stratified colloidal films assemble. Our research has relevance for the design of coatings with targeted optical and mechanical properties at their surface.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Makepeace, Davidd.makepeace@surrey.ac.ukUNSPECIFIED
Fortini, Andreaa.fortini@surrey.ac.ukUNSPECIFIED
Markov, AUNSPECIFIEDUNSPECIFIED
Locatelli, PUNSPECIFIEDUNSPECIFIED
Lindsay, CUNSPECIFIEDUNSPECIFIED
Moorhouse, SUNSPECIFIEDUNSPECIFIED
Lind, RUNSPECIFIEDUNSPECIFIED
Sear, RichardR.Sear@surrey.ac.ukUNSPECIFIED
Keddie, JosephJ.Keddie@surrey.ac.ukUNSPECIFIED
Date : 18 September 2017
Identification Number : 10.1039/C7SM01267E
Copyright Disclaimer : Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Depositing User : Melanie Hughes
Date Deposited : 22 Aug 2017 08:19
Last Modified : 19 Sep 2017 13:30
URI: http://epubs.surrey.ac.uk/id/eprint/841990

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