title: pH-Sensitive Adsorption Behavior of Polymer Particles at the Air-Water Interface.
abstract: pH-Sensitive adsorption of polymer particles bearing poly[2-(dimethylamino)ethyl methacrylate] hairs at the air-water interface was investigated using a surface tensiometer, a Langmuir-Blodgett trough, and an X-ray reflectometer. We clarified that the particles are adsorbed at the interface at basic pH; by contrast, at acidic pH, only a small number of particles are adsorbed, whereas the majority are dispersed in the water phase. X-ray reflectometry analysis revealed that a particle monolayer was formed at the air-water interface, which was packed densely under increasing surface pressure, as determined by the electron density profile change. The contact angles of the particles at the air-water interface were estimated to be 29° and 34° at pH 3 and 10, respectively, by direct visualization of the air-water interface position of the particles using a polycyanoacrylate trapping method.
authors.forename: Syuji
authors.identifier: 0000-0003-2562-9502
authors.initials: S
authors.lastname: Fujii
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology , 1-1 Sensui, Tobata, Kitakyushu, Fukuoka 804-8550, Japan.
authors.forename: Emiko
authors.initials: E
authors.lastname: Mouri
authors.forename: Ko
authors.initials: K
authors.lastname: Akiyama
authors.forename: Saori
authors.initials: S
authors.lastname: Nakayama
authors.affiliation: Department of Polymer Chemistry, Kyoto University , Katsura, Nishikyo, Kyoto 615-8510, Japan.
authors.forename: Kyohei
authors.initials: K
authors.lastname: Uda
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Nakamura
authors.affiliation: Department of Polymer Chemistry, Kyoto University , Katsura, Nishikyo, Kyoto 615-8510, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Matsuoka