title: Sodium dodecylsulfate bilayer formation under a cationic surfactant Langmuir monolayer at the air-water interface.
abstract: An aqueous solution of sodium dodecylsulfate (SDS) was injected into a Langmuir monolayer of dioctadecyldimethylammonium chloride (DODAC) at the air-water interface. Infrared external spectra, atomic force microscopy (AFM), and quartz crystal microbalance (QCM) measurements revealed that the resulting surface monolayer was a multilayer structure consisting of a DODAC monolayer as the upper layer and an SDS bilayer as the underlayer. Furthermore, the SDS alkyl chain was in the all-trans conformation, and the molecular packing of the DODAC alkyl chains was hexagonal with the trans-zigzag plane of the methylene chain oriented randomly around the chain axis. We also discuss the structure of the multilayer obtained by injecting SDS into a mixed Langmuir monolayer of DODAC + SDS.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nakamura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Endo
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Yamashita
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawai
mesh_terms: D000327:Adsorption; D000388:Air; D002412:Cations; D005740:Gases; D008051:Lipid Bilayers / Q000737:chemistry*; D008567:Membranes, Artificial; D018625:Microscopy, Atomic Force; D011791:Quartz; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D002412:Cations; D005740:Gases; D008051:Lipid Bilayers; D008567:Membranes, Artificial; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; D011791:Quartz; C015831:dimethyldioctadecylammonium; D012967:Sodium Dodecyl Sulfate