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Dispersion relation of lipid membrane shape fluctuations by neutron spin-echo spectrometry | | Maikel C. Rheinstadter
; Wolfgang Haussler
; Tim Salditt
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; | | Date: |
5 Jun 2006 | | Subject: | Soft Condensed Matter | | Abstract: | We have studied the mesoscopic shape fluctuations in aligned multilamellar stacks of DMPC bilayers using the neutron spin-echo technique. The corresponding in plane dispersion relation $ au^{-1}$(q$_{ }$) at different temperatures in the gel (ripple, P$_{eta’}$) and the fluid (L$_{alpha}$) phase of this model system has been determined. Two relaxation processes, one at about 10ns and a second, slower process at about 100ns can be quantified. The dispersion relation in the fluid phase is fitted to a smectic hydrodynamic theory, with a correction for finite q$_z$ resolution. We extract values for, the bilayer bending rigidity $kappa$, the compressional modulus of the stacks $B$, and the effective sliding viscosity $eta_3$. The softening of a mode which can be associated with the formation of the ripple structure is observed close to the main phase transition. | | Source: | arXiv, cond-mat/0606114 | | Services: | Forum | Review | PDF | Favorites | |
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