Dissipative curvature fluctuations in bilayer vesicles: Coexistence of pure-bending and hybrid curvature-compression modes |
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| Authors: | L R Arriaga R Rodríguez-García I López-Montero B Farago T Hellweg and F Monroy |
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| Institution: | 1.Mechanics of Biological Membranes and Biorheology,Universidad Complutense, Ciudad Universitaria s/n,Madrid,Spain;2.Institut Laue Langevin,Grenoble Cedex 9,France;3.Physikalische Chemie I,Univerist?t Bayreuth, Universit?tsstra?e 30,Bayreuth,Germany |
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| Abstract: | We have studied the relaxation dynamics of shape fluctuations in unilamellar lipid vesicles by neutron spin echo (NSE). The
presence of a hybrid curvature-compression mode coexisting with the usual bending one has been revealed in the experimental
relaxation functions at high q . Differently to the conventional relaxation ∼ q
3 typical for bending modes, the hybrid mode was found to relax as ∼ q
2 , which is compatible with a dissipation mechanism arising from intermonolayer friction. Complementary data obtained from
flickering spectroscopy (FS) in giant unilamellar vesicles confirm the existence of both modes coexisting together. By combining
NSE and FS data we have depicted the experimental bimodal dispersion diagram, which is found compatible with theoretical predictions
for reliable values of the material parameters. From the present data two conventional dynamical methods (NSE and FS) have
been shown to be suitable for measuring intermonolayer friction coefficients in bilayer vesicles. |
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