Abstract
Membrane undulations of highly ordered bare nonionic surfactant penta(ethyleneglycol) dodecyl ether (C 12E 5) multilayers were studied by neutron spin echo spectroscopy (NSE). The membrane relaxations profiles were fitted by a stretched exponential law S( q, t)= S( q) exp( Γ q t) 3/2, where S( q) is the static structure factor and Γ q is the relaxation rate. The universal scaling law Γ q ∼ q 3 for qd/2 π>1, where d is the inter-lamellar spacing was observed. From the dependence of Γ q on d as obtained for different surfactant volume fractions, shows that intermembrane contributions are still important at these q values. A model comb-graft polymer with monodisperse Polyethylene glycol (PEG) blocks of 6 kg/mol connecting C 18 stearylamide hydrophobes, which serve as anchors, was introduced in the lamellar phase at increasing polymer concentration at two membrane volume fraction of 20% and 30% (Langmuir 18 (2002) 6).
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