caa a22 4500 465797342 CHVBK 20180323112042.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02540478 doi (NATIONALLICENCE)springer-10.1007/BF02540478 Cloud point phenomena in mixtures of anionic and cationic surfactants in aqueous solution [Elektronische Daten] [Y. Nakama, F. Harusawa, I. Murotani] The interaction between anionic and cationic surfactants was investigated by means of surface tension, conductivity, and nuclear magnetic resonance. It was found that a strong interaction exists between anionic and cationic surfactants and the mixed surfactant has a hydrophobic property. The phase diagram has been determined as a function of temperature for the waterstearyltrimethylammonium chloride (STAC)-sodium laurate (NaL). The Krafft point rose remarkably in equimolar mixtures for this system. The phase diagram has been determined as a function of temperature for the STAC-sodium-N-lauroyl-N-methyl-β-alanine (NaLMA) system. The liquid-liquid phase separation phenomenon was observed around an equimolar mixture. It can be identified with the cloud point, which is shown by nonionic surfactants. This phenomenon seemed to be caused by the decreased solute-solvent interaction (i.e., dehydration of the amido group contained in NaLMA molecule) as the temperature is raised. The decreasing effect of protein (ovalbumin) denaturation was observed in the high area of the mole fraction of cationic surfactant in the cationic-anionic system. We believe that this is due to the remarkable lowering of the monomer concentration by the formation of a hydrophobic complex. AOCS Press, 1990 Cationic-anionic system nationallicence cloud point nationallicence ion pair nationallicence Nakama Y. Shiseido Laboratories, 1050, Nippa-cho, Kohoku-ku, 223, Yokohama-shi, Japan aut Harusawa F. Shiseido Laboratories, 1050, Nippa-cho, Kohoku-ku, 223, Yokohama-shi, Japan aut Murotani I. Shiseido Laboratories, 1050, Nippa-cho, Kohoku-ku, 223, Yokohama-shi, Japan aut Journal of the American Oil Chemists' Society Springer-Verlag 67/11(1990-11-01), 717-721 0003-021X 67:11<717 1990 67 11746 https://doi.org/10.1007/BF02540478 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02540478 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nakama Y. Shiseido Laboratories, 1050, Nippa-cho, Kohoku-ku, 223, Yokohama-shi, Japan aut NATIONALLICENCE 700 1- Harusawa F. Shiseido Laboratories, 1050, Nippa-cho, Kohoku-ku, 223, Yokohama-shi, Japan aut NATIONALLICENCE 700 1- Murotani I. Shiseido Laboratories, 1050, Nippa-cho, Kohoku-ku, 223, Yokohama-shi, Japan aut NATIONALLICENCE 773 0- Journal of the American Oil Chemists' Society Springer-Verlag 67/11(1990-11-01), 717-721 0003-021X 67:11<717 1990 67 11746 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer