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

Abstract

Inverted phase coexistence where ordered phase appears on top of disordered phase, as opposed to regular observations, have been observed in polydisperse colloidal suspensions. Here we study the dynamics of this remarkable phenomenon by accounting for gravitational sedimentation in a system of bi-disperse platelets within thickness. In the dynamic regimes, we clearly show that the thick platelets sediment preferentially to exclude the thin ones into a region enriched nematic phase from the bottom by time, which indicates a formation of floating nematic phase. By turning the factors of initial concentration and magnitude of sedimentation, we can manage the time-evolution of the floating nematic phase, namely the motion of its two interfaces, in different dynamic routes. A significant role of gravitational sedimentation, in the system with the certain platelets loading, is evidenced to cause diversely resulting structures of phase coexistence at equilibrium.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8SM01177J

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