Мақола

Effect of Amino‐Acid‐Based Polar Oils on the Krafft Temperature and Solubilization in Ionic and Nonionic Surfactant Solutions

Hironobu KuniedaGraduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79‐5, Hodogaya‐ku, Yokohama, 240‐8501, JapanKatsutoshi MatsuzawaGraduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79‐5, Hodogaya‐ku, Yokohama, 240‐8501, JapanRаvshan MakhkamovGraduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79‐5, Hodogaya‐ku, Yokohama, 240‐8501, Japan ; Institute of General and Inorganic Chemistry , Academy of Sciences of Uzbekistan , Tashkent, UzbekistanMakiko HoriiGraduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79‐5, Hodogaya‐ku, Yokohama, 240‐8501, JapanYuji YamashitaGraduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79‐5, Hodogaya‐ku, Yokohama, 240‐8501, JapanRyosuke YumiokaAmino‐Science Laboratory , Ajinomoto Co., Inc. , Kawasaki‐ku, Kawasaki, JapanMasako KoyamaAmino‐Science Laboratory , Ajinomoto Co., Inc. , Kawasaki‐ku, Kawasaki, JapanKazutami SakamotoGraduate School of Environment and Information Sciences , Yokohama National University , Tokiwadai 79‐5, Hodogaya‐ku, Yokohama, 240‐8501, Japan ; Amino‐Science Laboratory , Ajinomoto Co., Inc. , Kawasaki‐ku, Kawasaki, Japan

Journal of Dispersion Science and Technologyjournal2003en

ABI

Аннотация

Abstract The Krafft temperature and solubilization power of ionic and nonionic surfactants in aqueous solutions are strongly affected by added polar oils such as amino‐acid‐based oils (e.g., N‐acylamino acid esters, AAE), because they tend to be solubilized in the surfactant palisade layer. The Krafft temperatures of 5 wt.% sodium dodecyl sulfate (SDS)‐water and octaoxyethylene octadecyl ether (C18EO8)‐water systems largely decreases upon addition of AAE and 1‐hexanol, whereas it decreases very slightly in isopropyl myristate (IPM) and n‐dodecane. The lowering of the Krafft temperature can be explained by the same mechanism as the melting‐temperature reduction of mixing two ordinary substances. Namely, the polar oils are solubilized in the surfactant palisade layer of micelles and reduce the melting temperature of hydrated solid‐surfactant (Krafft temperature). On the other hand, non‐polar oil such as dodecane is solubilized deep inside micelles and makes an oil pool. The solubilization of non‐polar oil is enhanced by mixing surfactant with AAE due to an increase in micellar size.

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Мавзулар

Surfactants and Colloidal Systems Spectroscopy and Quantum Chemical Studies Chemical and Physical Properties in Aqueous Solutions

Идентификаторлар

DOI: 10.1081/dis-120025544

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