title: Stable ordering in Langmuir-Blodgett films.
abstract: Defects in the layering of Langmuir-Blodgett (LB) films can be eliminated by depositing from the appropriate monolayer phase at the air-water interface. LB films deposited from the hexagonal phase of cadmium arachidate (CdA2) at pH 7 spontaneously transform into the bulk soap structure, a centrosymmetric bilayer with an orthorhombic herringbone packing. A large wavelength folding mechanism accelerates the conversion between the two structures, leading to a disruption of the desired layering. At pH > 8.5, though it is more difficult to draw LB films, almost perfect layering is obtained due to the inability to convert from the as-deposited structure to the equilibrium one.
authors.affiliation: Department of Chemical Engineering and Materials, University of California, Santa Barbara, CA 93106, USA.
authors.forename: D Y
authors.initials: DY
authors.lastname: Takamoto
authors.forename: E
authors.initials: E
authors.lastname: Aydil
authors.forename: J A
authors.initials: JA
authors.lastname: Zasadzinski
authors.forename: A T
authors.initials: AT
authors.lastname: Ivanova
authors.forename: D K
authors.initials: DK
authors.lastname: Schwartz
authors.forename: T
authors.initials: T
authors.lastname: Yang
authors.forename: P S
authors.initials: PS
authors.lastname: Cremer
mesh_terms: D002104:Cadmium / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003460:Crystallization; D004537:Eicosanoic Acids / Q000737:chemistry*; D005227:Fatty Acids / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008051:Lipid Bilayers; D018625:Microscopy, Atomic Force; D013057:Spectrum Analysis; D013229:Stearic Acids / Q000737:chemistry*; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D004537:Eicosanoic Acids; D005227:Fatty Acids; D008051:Lipid Bilayers; D013229:Stearic Acids; D002104:Cadmium; C031183:stearic acid; C010210:lignoceric acid