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Anomalous lateral diffusion in a viscous membrane surrounded by viscoelastic media

par Komura, Shigeyuki;Ramachandran, Sanoop ;Seki, Kazuhiko
Référence Europhysics letters, 97, 6, 68007 (6pp)
Publication Publié, 2012-03

Article révisé par les pairs

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Résumé :

We investigate the lateral dynamics in a purely viscous lipid membrane surrounded by viscoelastic media such as polymeric solutions. We first obtain the generalized frequency-dependent mobility tensor and focus on the case in which the solvent is sandwiched by hard walls. Due to the viscoelasticity of the solvent, the mean square displacement of a disk embedded in the membrane exhibits an anomalous diffusion. A useful relation which connects the mean square displacement and the solvent modulus is provided. We also calculate the cross-correlation of the particle displacements which can be applied for two-particle tracking experiments. © 2012 Europhysics Letters Association.