Abstract
We have studied the H-bonded dynamics in highly oriented lamellar DOTAP-DOPC model membranes as a function of the DOPC/(DOPC+DOTAP) ratio φ, by elastic incoherent neutron scattering in the 100 ps time domain on the spectrometer IN13 at ILL. Motions in the in-plane and out-of plane directions have been explored by orienting the momentum transfer predominantly parallel and normal to the surface of highly oriented multilayers, respectively. Increasing the neutral lipid (DOPC) concentration from φ=0.5–0.8 we reveal a reduction of the dynamics along the direction normal to the membrane and an unchanged dynamics on the membrane plane.
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