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Particles with selective wetting affect spinodal decomposition microstructures

Ghosh, Supriyo and Mukherjee, Arnab and Abinandanan, TA and Bose, Suryasarathi (2017) Particles with selective wetting affect spinodal decomposition microstructures. In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 19 (23). pp. 15424-15432.

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Official URL: http://dx.doi.org/10.1039/c7cp01816a

Abstract

We have used mesoscale simulations to study the effect of immobile particles on microstructure formation during spinodal decomposition in ternary mixtures such as polymer blends. Specifically, we have explored a regime of interparticle spacings (which are a few times the characteristic spinodal length scale) in which we might expect interesting new effects arising from interactions among wetting, spinodal decomposition and coarsening. In this paper, we report three new effects for systems in which the particle phase has a strong preference for being wetted by one of the components (say, A). In the presence of particles, microstructures are not bicontinuous in a symmetric mixture. An asymmetric mixture, on the other hand, first forms a non-bicontinuous microstructure which then evolves into a bicontinuous one at intermediate times. Moreover, while wetting of the particle phase by the preferred component (A) creates alternating A-rich and B-rich layers around the particles, curvature-driven coarsening leads to shrinking and disappearance of the first A-rich layer, leaving a layer of the non-preferred component in contact with the particle. At late simulation times, domains of the matrix components coarsen following the Lifshitz-Slyozov-Wagner law, R-1(t) similar to t(1/3).

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 14 Jul 2017 05:08
Last Modified: 14 Feb 2019 06:35
URI: http://eprints.iisc.ac.in/id/eprint/57378

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