University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Stratification and Size Segregation of Ternary and Polydisperse Colloidal Suspensions during Drying

Fortini, A and Sear, Richard (2017) Stratification and Size Segregation of Ternary and Polydisperse Colloidal Suspensions during Drying LANGMUIR, 33 (19). pp. 4796-4805.

[img] Text
fortini_sear.pdf - Accepted version Manuscript
Restricted to Repository staff only until 20 April 2018.

Download (2MB)
[img] Text
fortini_sear_suppl.pdf - Accepted version Manuscript
Restricted to Repository staff only until 20 April 2018.

Download (249kB)
[img] Video
la7b00946_si_001.avi - Supplemental Material
Restricted to Repository staff only until 20 April 2018.

Download (5MB)

Abstract

We investigate the drying process of three-component and polydisperse colloidal suspensions using Brownian dynamics simulations. We have previously reported (Phys. Rev. Lett. 2016, 116, 118301) on the drying of binary mixtures. For binary mixtures, we found that a gradient of colloidal osmotic pressure develops during drying and that this leads to the final film being stratified with a layer of smaller particles on top of a layer of larger particles. Here, we find that stratification by size is very general and also occurs in ternary and polydisperse mixtures. We name the segregation effect colloidal diffusiophoresis. In particular, we show that by changing the composition of a ternary mixture, different stratification morphologies can be achieved and hence the film properties can be tuned. In polydisperse spheres, colloidal diffusiophoresis leads to enrichment in the large particles at the bottom part of the film, whereas the top part is enriched with smaller particles. This segregation means that in the final film, the particle size distribution depends on height. Thus, the properties of the film will then depend on height. We propose a model that predicts a power-law dependence of the phoretic velocity on particle size. Results from the model and simulation show a good agreement

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Fortini, AUNSPECIFIEDUNSPECIFIED
Sear, RichardR.Sear@surrey.ac.ukUNSPECIFIED
Date : 20 April 2017
Identification Number : 10.1021/acs.langmuir.7b00946
Copyright Disclaimer : Copyright © 2017 American Chemical Society
Depositing User : Jane Hindle
Date Deposited : 18 Aug 2017 08:02
Last Modified : 22 Sep 2017 08:24
URI: http://epubs.surrey.ac.uk/id/eprint/841956

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800