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- W2059617093 abstract "We propose a physical mechanism for the arrest of domain coarsening in a system of two apposed two-dimensional binary fluids. The two fluids are subject to a dynamic asymmetry: strong friction with the environment allows domains in one fluid layer (the “bottom” fluid) to grow only diffusively, whereas hydrodynamic flow leads to initially faster growth in the apposed fluid (the “top” layer). The two fluids are energetically coupled so that domains of similar type interact favorably across the two fluids. Using lattice Boltzmann simulations we observe that at a certain length scale, which is independent of the coarsening state in the bottom layer, domain growth in the top layer comes to an arrest. A phenomenological model suggests the pinning of domains across the two fluids to cause the arrest in domain growth. The pinning results from the interplay between line tension and domain coupling strength across the two fluids. We apply our model to a lipid bilayer for which we calculate the length scale of the dynamically arrested domains in the top layer. We find domain extensions of about or somewhat larger than 20 nm. Potential applications of our pinning model are to mixed lipid bilayers that tend to phase separate and are subject to a dynamic asymmetry; these include model membranes on a solid support and lipid rafts in the plasma membrane." @default.
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- W2059617093 date "2011-01-01" @default.
- W2059617093 modified "2023-09-27" @default.
- W2059617093 title "Pinning of domains for fluid–fluid phase separation in lipid bilayers with asymmetric dynamics" @default.
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- W2059617093 doi "https://doi.org/10.1039/c0sm00462f" @default.
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