ナイロン粒子への硫酸アルキルナトリウムの吸着

概要

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The adsorption of sodium alkyl sulfates (sodium decyl, sodium dodecyl, sodium tetradecyl and sodium hexadecyl sulfates) on nylon particles from their aqueous solutions was investigated by the electrokinetic method. The equilibrium adsorption isotherms of the surfactants were obtained from the electrokinetic potentials of particles dispersed in aqueous solutions of sodium alkylsulfates at different temperatures. The equilibrium constant of adsorption, K, and the saturated adsorption amount, Γs, were determined from Langmuir plots. The values of K and Γs by the electrokinetic method were compared with those obtained by the electric conductivity method under the same experimental conditions, The values of K and thermodynamic parameters determined by the electrokinetic and electric conductivity methods agreed with each other. The values of Γs obtained by the former method, however, were from 1/40 to 1/50 those calculated by the latter. Comparison of Γs by the both methods provided information on the slipping plane and the dissociation degree of the adsorbed surfactants.
社団法人日本油化学会の論文