title: Adsorption and desorption dynamics of sodium dodecyl sulfate at the octadecylsilane layer on the pore surface of a mesoporous silica film observed in-situ by optical waveguide spectroscopy.
abstract: The purpose of this study is to apply optical waveguide (OWG) spectroscopy to observe adsorption and desorption dynamics occurring in a surfactant-templated mesoporous silica film. For that purpose, a mesoporous silica (MS) film with open accessible pores (pore diameter, ca. 6 nm) was formed on an aluminum (Al) layer deposited on a glass substrate, and the pore surface of the MS film was modified with octadecylsilane (ODS). The resulting ODS-modified MS (ODS-MS) and Al multilayer film showed a clear waveguide coupling dip in the reflection spectrum. The position of the waveguide coupling dip was red-shifted as the amount of sodium dodecyl sulfate within the ODS-MS layer increases. These results indicate the usefulness of OWG spectroscopy for the study of adsorption/desorption dynamics occurring in MS materials.
authors.affiliation: College of Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310–8512, Japan. yakira@mx.ibaraki.ac.jp
authors.forename: Akira
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Arafune
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Hotta
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Itoh
authors.forename: Norio
authors.initials: N
authors.lastname: Teramae
mesh_terms: D000327:Adsorption; D008567:Membranes, Artificial; D016062:Porosity; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013057:Spectrum Analysis; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D012821:Silanes; C024779:octadecylsilane; D012967:Sodium Dodecyl Sulfate; D012822:Silicon Dioxide