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pH-Sensitive Adsorption Behavior of Polymer Particles at the Air-Water Interface
Syuji Fujii, Emiko Mouri1, Ko Akiyama
1Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology , 1-1 Sensui, Tobata, Kitakyushu, Fukuoka 804-8550, Japan.
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.
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