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On The Critical Casimir Interaction Between Anisotropic Inclusions On A Membrane

Benet, J.; Paillusson, F.; Kusumaatmaja, H.

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Authors

J. Benet

F. Paillusson



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.

Citation

Benet, J., Paillusson, F., & Kusumaatmaja, H. (2017). On The Critical Casimir Interaction Between Anisotropic Inclusions On A Membrane. Physical Chemistry Chemical Physics, 19(35), 24188-24196. https://doi.org/10.1039/c7cp03874g

Journal Article Type Article
Acceptance Date Aug 10, 2017
Online Publication Date Aug 25, 2017
Publication Date Aug 1, 2017
Deposit Date Aug 10, 2017
Publicly Available Date Aug 10, 2017
Journal Physical Chemistry Chemical Physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 19
Issue 35
Pages 24188-24196
DOI https://doi.org/10.1039/c7cp03874g
Related Public URLs https://arxiv.org/abs/1706.00905

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