title: Single molecule diffusion in critical lipid bilayers.
abstract: Time-dependent single molecule diffusion coefficients are discussed for a fluorescent probe molecule in lipid mixtures near a miscibility critical point. The calculations take advantage of the theoretical wave vector dependent composition diffusion coefficients obtained by Inaura and Fujitani [J. Phys. Soc. Jpn. 77, 114603 (2008)]. It is suggested that the diffusion of the probe molecule reflects in part the time-dependent composition diffusion near a critical point. The calculations show a striking biphasic time-dependent diffusion that switches from a faster diffusion at short times to a slower diffusion at a time approximately equal to πξ(2)/D where ξ is the correlation length and D is the composition diffusion coefficient at the switch time. This biphasic diffusion should be readily detectable experimentally.
authors.affiliation: Department of Chemistry, Stanford University, Stanford, California 94305, USA. harden@stanford.edu
authors.forename: Harden
authors.initials: H
authors.lastname: McConnell
mesh_terms: D004058:Diffusion; D005456:Fluorescent Dyes / Q000737:chemistry*; D007700:Kinetics; D008051:Lipid Bilayers / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D008051:Lipid Bilayers