Abstract
Abstract Amphoteric surfactant, sodium N-lauroylglycine, was synthesized and symbolized as SLG. The surface chemical properties and micelle behaviors of SLG in 0–0.5 mol · L−1 aqueous solution of sodium chloride were investigated by surface tension measurements at 298–313 K. The critical micelle concentrations (cmc) of pure surfactant were determined in 0–0.5 mol · L−1 sodium chloride aqueous solution. Fluorescence and micelle aggregation number (N agg) measurements have been used to investigate the variations of micro-polarity and micellization behavior. The added NaCl has a tendency to increase the attractive interaction between the surfactant molecules in both the micellar phase and the adsorption layer. The Gibbs free energy of micellization (ΔG m 0 ) is negative for all investigated systems, and the thermodynamic parameters of SLG indicate that the micellization of SLG is entropy driven.
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