Membrane undulations of highly ordered bare nonionic surfactant penta(ethyleneglycol) dodecyl ether (C12E5) 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(Γqt)3/2, where S(q) is the static structure factor and Γq is the relaxation rate. The universal scaling law Γq∼q3 for qd/2π>1, where d is the inter-lamellar spacing was observed. From the dependence of Γq 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 6kg/mol connecting C18 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).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Neutron scattering