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On the critical Casimir interaction between anisotropic inclusions on a membrane.

Benet, J. and Paillusson, F. and Kusumaatmaja, H. (2017) 'On the critical Casimir interaction between anisotropic inclusions on a membrane.', Physical chemistry chemical physics., 19 (35). 24188-24196 .

Abstract

Using a lattice model and a versatile thermodynamic integration scheme, we study the critical Casimir interactions between inclusions embedded in a two-dimensional critical binary mixtures. For single-domain inclusions we demonstrate that the interactions are very long range, and their magnitudes strongly depend on the affinity of the inclusions with the species in the binary mixtures, ranging from repulsive when two inclusions have opposing affinities to attractive when they have the same affinities. When one of the inclusions has no preference for either of the species, we find negligible critical Casimir interactions. For multiple-domain inclusions, mimicking the observations that membrane proteins often have several domains with varying affinities to the surrounding lipid species, the presence of domains with opposing affinities does not cancel the interactions altogether. Instead we can observe both attractive and repulsive interactions depending on their relative orientations. With increasing number of domains per inclusion, the range and magnitude of the effective interactions decrease in a similar fashion to those of electrostatic multipoles. Finally, clusters formed by multiple-domain inclusions can result in an effective affinity patterning due to the anisotropic character of the Casimir interactions between the building blocks.

Item Type:Article
Full text:(AM) Accepted Manuscript
First Live Deposit - 10 August 2017
Available under License - Creative Commons Attribution.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1039/C7CP03874G
Publisher statement:This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Record Created:10 Aug 2017 14:43
Last Modified:14 Sep 2017 10:41

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