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Experimental observations of dynamic critical phenomena in a lipid membrane.


ABSTRACT: Near a critical point, the time scale of thermally induced fluctuations diverges in a manner determined by the dynamic universality class. Experiments have verified predicted three-dimensional dynamic critical exponents in many systems, but similar experiments in two dimensions have been lacking for the case of conserved order parameter. Here we analyze the time-dependent correlation functions of a quasi-two-dimensional lipid bilayer in water to show that its critical dynamics agree with a recently predicted universality class. In particular, the effective dynamic exponent z(eff) crosses over from ~2 to ~3 as the correlation length of fluctuations exceeds a hydrodynamic length set by the membrane and bulk viscosities.

SUBMITTER: Honerkamp-Smith AR 

PROVIDER: S-EPMC3722069 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature

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Experimental observations of dynamic critical phenomena in a lipid membrane.

Honerkamp-Smith Aurelia R AR   Machta Benjamin B BB   Keller Sarah L SL  

Physical review letters 20120628 26


Near a critical point, the time scale of thermally induced fluctuations diverges in a manner determined by the dynamic universality class. Experiments have verified predicted three-dimensional dynamic critical exponents in many systems, but similar experiments in two dimensions have been lacking for the case of conserved order parameter. Here we analyze the time-dependent correlation functions of a quasi-two-dimensional lipid bilayer in water to show that its critical dynamics agree with a recen  ...[more]

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