Colloidal assembly by ice templating

Faraday Discussions
Guruswamy KumaraswamyChandan Kumar Choudhury

Abstract

We investigate ice templating of aqueous dispersions of polymer coated colloids and crosslinkers, at particle concentrations far below that required to form percolated monoliths. Freezing the aqueous dispersions forces the particles into close proximity to form clusters, that are held together as the polymer chains coating the particles are crosslinked. We observe that, with an increase in the particle concentration from about 10(6) to 10(8) particles per ml, there is a transition from isolated single particles to increasingly larger clusters. In this concentration range, most of the colloidal clusters formed are linear or sheet like particle aggregates. Remarkably, the cluster size distribution for clusters smaller than about 30 particles, as well as the size distribution of linear clusters, is only weakly dependent on the dispersion concentration in the range that we investigate. We demonstrate that the main features of cluster formation are captured by kinetic simulations that do not consider hydrodynamics or instabilities at the growing ice front due to particle concentration gradients. Thus, clustering of colloidal particles by ice templating dilute dispersions appears to be governed only by particle exclusion by the growi...Continue Reading

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Citations

Nov 7, 2018·Journal of Separation Science·José Luís Dores-SousaSebastiaan Eeltink
Feb 2, 2019·Angewandte Chemie·Saurabh UsgaonkarGuruswamy Kumaraswamy
Jul 18, 2017·The Journal of Chemical Physics·Sanat K KumarRobert A Riggleman
Sep 29, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Debarshi Mitra, Apratim Chatterji
Mar 18, 2021·Soft Matter·Bipul BiswasGuruswamy Kumaraswamy

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