Fluctuations of Permeable Interfaces in Water-in-Water Emulsions

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The fluctuations of highly permeable interfaces, encountered in phase-separated biopolymer solutions, liposomes, polymersomes, or colloidosomes, are investigated. An expression for the power spectrum of the height correlation function is derived for a multicomponent system, incorporating the effects of mass transfer across the interface, using nonequilibrium thermodynamics. We also derive an expression for the relaxation time of the height correlation function, and calculate the relaxation time for a phase-separated gelatin-dextran-water system. Comparing our expression with the expression for an impermeable interface shows that mass transfer has a significant impact on the relaxation time of the interface
Original languageEnglish
Article number066105
Number of pages4
JournalPhysical Review Letters
Publication statusPublished - 2007


  • bending rigidity
  • biopolymer
  • mixtures

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