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Issue 44, 2018
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Dynamics of the floating nematic phase formation in platelet suspension with thickness polydispersity by sedimentation

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Abstract

An inverted phase coexistence, where an ordered phase appears on top of a disordered phase, has been observed in polydisperse colloidal suspensions. Herein, we studied the dynamics of this phenomenon in a suspension of a mixture of two types of platelets, namely, thick and thin. We show that the thick platelets preferentially sediment first excluding the thin platelets, and create a region enriched with thin platelets at some place above the bottom, which eventually gives the inverted configuration. We show that such interplay between the sedimentation and the isotropic–nematic phase transition can cause a rich and complex sedimentation dynamic. Depending on the initial concentration and the gravity strength, the interface between the isotropic phase and the nematic phase can move up or down during the sedimentation, and a variety of final equilibrium structures can appear.

Graphical abstract: Dynamics of the floating nematic phase formation in platelet suspension with thickness polydispersity by sedimentation

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Publication details

The article was received on 08 Jun 2018, accepted on 30 Sep 2018 and first published on 01 Oct 2018


Article type: Paper
DOI: 10.1039/C8SM01177J
Citation: Soft Matter, 2018,14, 8956-8961

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    Dynamics of the floating nematic phase formation in platelet suspension with thickness polydispersity by sedimentation

    J. Sui, M. Doi and Y. Ding, Soft Matter, 2018, 14, 8956
    DOI: 10.1039/C8SM01177J

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