title: Substrate suppression of thermal roughness in stacked supported bilayers.
abstract: We have fabricated a stack of five 1,2-dipalmitoyl-sn-3-phosphatidylethanolamine (DPPE) bilayers supported on a polished silicon substrate in excess water. The density profile of these stacks normal to the substrate was obtained through analysis of x-ray reflectivity. Near the substrate, we find the layer roughness and repeat spacing are both significantly smaller than values found in bulk multilayer systems. The reduced spacing and roughness result from suppression of lateral fluctuations due to the flat substrate boundary. The layer spacing decrease then occurs due to reduced Helfrich repulsion.
authors.affiliation: Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA.
authors.forename: Curt M
authors.initials: CM
authors.lastname: DeCaro
authors.forename: Justin D
authors.initials: JD
authors.lastname: Berry
authors.forename: Laurence B
authors.initials: LB
authors.lastname: Lurio
authors.forename: Yicong
authors.initials: Y
authors.lastname: Ma
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Sunil
authors.initials: S
authors.lastname: Sinha
authors.forename: Lobat
authors.initials: L
authors.lastname: Tayebi
authors.forename: Atul N
authors.initials: AN
authors.lastname: Parikh
authors.forename: Zhang
authors.initials: Z
authors.lastname: Jiang
authors.forename: Alec R
authors.initials: AR
authors.lastname: Sandy
mesh_terms: D003198:Computer Simulation; D008051:Lipid Bilayers / Q000737:chemistry*; D008560:Membrane Fluidity; D008956:Models, Chemical; D008958:Models, Molecular; D010714:Phosphatidylethanolamines / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D008051:Lipid Bilayers; D010714:Phosphatidylethanolamines; C007510:1,2-dipalmitoyl-3-phosphatidylethanolamine