Radiotracer Studies of the Adsorption of an Ampholytic Surfactant, <I>N</I>-dodecyl-β-alanine, at the Aqueous Surface
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概要
- 論文の詳細を見る
A tritiated ampholytic surfactant, <I>N</I>-dodecyl-β-alanine, C<SUB>10</SUB>H<SUB>21</SUB>–(CHT)<SUB>2</SUB>–NH<SUB>2</SUB><SUP>+</SUP>–(CH<SUB>2</SUB>)<SUB>2</SUB>–COO<SUP>−</SUP>, was synthesized, and the amount of adsorption on an aqueous surface was measured directly by the radiotracer method. The adsorption isotherm near the neutral pH region showed a saturation value of 3.73×10<SUP>−10</SUP> mol/cm<SUP>2</SUP> above the concentration of about 1/5 of the critical micelle concentration in the absence of added salt, and a value of 4.74×10<SUP>−10</SUP> mol/cm<SUP>2</SUP> above the critical micelle concentration in the presence of 1 mol/l NaCl. In the presence of 1 mol/l NaCl, no effect of pH on the adsorption was found. The Gibbs adsorption isotherm applicable to the aqueous ampholytic surfactant was derived. The observed amounts of adsorption in the presence and absence of NaCl were in good agreement with the values calculated from the Gibbs adsorption isotherm, using the surface tension data measured by the Wilhelmy plate method.
- 公益社団法人 日本化学会の論文
著者
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Nakamura Akio
Department Of Information And Computer Sciences Saitama University
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Tajima Kazuo
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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Okumura Takeo
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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