Relaxation phenomena after an area strain on the adsorbed surfaces of aqueous solutions of poly(oxyethylene) dodecyl ethers.
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概要
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The relaxations were observed after suddenly dilating or compressing the equilibrium surfaces of aqueous solutions of poly(oxyethylene) dodecyl ethers, C<SUB>12</SUB>H<SUB>25</SUB>(OC<SUB>2</SUB>H<SUB>4</SUB>)<I><SUB>n</SUB></I>OH (<I>n</I>= 5 and 7), at 303 K. The relaxation is expressed as the Maxwell model, with a Hookean surface-area modulus and a Newtonian surface-area viscosity, if the absolute value of an area strain is less than 0.3. The surface-area modulus is dependent upon the amount of surfactant molecules adsorbed in the surface, <I>Γ</I>, regardless of the sign of the area strain. The relaxation time, τ<SUB>c</SUB>, in the case of compression is dependent on <I>Γ</I>, and τ<SUB>d</SUB> in the case of dilation depends on the monodispersed concentration of the surfactant in the bulk solution, <I>C</I>. The surface dilational viscosity, η<SUB>b</SUB><SUP>A</SUP>, has a maximum around the concentration at which the surface reaches the saturated adsorption. The rate constants for the adsorption and desorption were estimated by determining empirically the functions of 1/τ<SUB>d</SUB> and 1/τ<SUB>c</SUB> with respect to <I>C</I> and <I>Γ</I> respectively.
- 公益社団法人 日本化学会の論文
著者
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Takeuchi Shinichi
Department of Biomedical Engineering, Faculty of Engineering, Toin University of Yokohama, Yokohama 225-8502, Japan
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Nakamura Masao
Department of Chemistry, Faculty of Science, Tokai University
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Nakamura Masao
Department of Applied Chemistry, Faculty of Engineering, Nagoya University
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