title: Inter-lamellar interactions modulated by addition of guest components.
abstract: We have investigated the effects of a guest component (polymer or spherical colloidal particle) confined between flexible lamellar slits on the inter-lamellar interaction by means of a small-angle X-ray scattering technique and a neutron spin echo technique. The dominant interaction between flexible lamellar membranes without guest components is the Helfrich mechanism. The addition of a neutral polymer into the lamellar phase induces an attractive inter-lamellar interaction and finally destabilizes the lamellar phase. On the other hand, spherical colloidal particles confined between flexible lamellar membranes reduce the undulational fluctuations of lamellae and bring a repulsive inter-lamellar interaction. The behavior of the layer compression modulus of the lamellar membrane containing colloidal particles is well described by the entropical repulsive inter-lamellar interaction driven by steric hindrance.
authors.affiliation: Department of Physics, Faculty of Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo, Tokyo 112-0012, Japan. imai@phys.ocha.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Imai
authors.forename: R
authors.initials: R
authors.lastname: Mawatari
authors.forename: K
authors.initials: K
authors.lastname: Nakaya
authors.forename: S
authors.initials: S
authors.lastname: Komura
mesh_terms: D001703:Biophysics / Q000379:methods*; D003102:Colloids / Q000737:chemistry; D015233:Models, Statistical; D009502:Neutrons; D011108:Polymers / Q000737:chemistry*; D012542:Scattering, Radiation; D013501:Surface-Active Agents / Q000737:chemistry; D013997:Time Factors; D014965:X-Rays
chemical_list: D003102:Colloids; D011108:Polymers; D013501:Surface-Active Agents