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Sedimentation of a two-dimensional colloidal mixture exhibiting liquid-liquid and gas-liquid phase separation: a dynamical density functional theory study
journal contributionposted on 2014-10-07, 14:08 authored by Alexandr Malijevsky, Andrew ArcherAndrew Archer
We present dynamical density functional theory results for the time evolution of the density distribution of a sedimenting model two-dimensional binary mixture of colloids. The interplay between the bulk phase behaviour of the mixture, its interfacial properties at the confining walls, and the gravitational field gives rise to a rich variety of equilibrium and non-equilibrium morphologies. In the fluid state, the system exhibits both liquid-liquid and gas-liquid phase separation. As the system sediments, the phase separation significantly affects the dynamics and we explore situations where the final state is a coexistence of up to three different phases. Solving the dynamical equations in two-dimensions, we find that in certain situations the final density profiles of the two species have a symmetry that is different from that of the external potentials, which is perhaps surprising, given the statistical mechanics origin of the theory. The paper concludes with a discussion on this.
A.M. acknowledges support from the Czech Science Foundation, Project No. 13-09914S.
- Mathematical Sciences
Published inJOURNAL OF CHEMICAL PHYSICS
Pages? - ? (12)
CitationMALIJEVSKY, A. and ARCHER, A.J., 2013. Sedimentation of a two-dimensional colloidal mixture exhibiting liquid-liquid and gas-liquid phase separation: a dynamical density functional theory study. Journal of Chemical Physics, 139 (14), 144901.
Publisher© AIP Publishing
- VoR (Version of Record)
NotesCopyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Chemical Physics, 2013, 139 (14), 144901 and may be found at: http://dx.doi.org/10.1063/1.4823768