Radiotracer Studies on Adsorption of Surface Active Substance at Aqueous Surface. I. Accurate Measurement of Adsorption of Tritiated Sodium Dodecylsulfate
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概要
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We carried out direct measurement of adsorbed amount at the air-solution interface to confirm the validity of the Gibbs adsorption equation by using radiochemically and surface chemically pure tritiated sodium dodecylsulfate (TSDS) and a sheet scintillation counter, which was developed for the purpose of counting β-rays of tritium in air. The adsorbed amount increased with increasing SDS concentration and showed the saturation values of 3.19×10<SUP>−10</SUP> mol/cm<SUP>2</SUP> in the concentration region from 3.2×10<SUP>−3</SUP> to 14.4×10<SUP>−3</SUP> mol/1000 g solution at 25°C. For the salt-free solution of ionic surfactant the Gibbs adsorption equation is confirmed to be valid for <I>n</I>=2 when activity in place of concentration is used. The equation of state for the ionic adsorbed film is further proposed. The cohesive pressure due to the attraction between hydrocarbon chains was given as a function of inverse molecular area.
- 公益社団法人 日本化学会の論文
著者
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Tajima Kazuo
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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Muramatsu Mitsuo
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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Sasaki Tsunetaka
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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