Phase Transition Behavior of Cationic Surfactant-Water Systems Studied by Nanosecond Fluorescence Anisotropy.

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  • FUJIWARA Masami
    Surfance Science Research Center, Lion Corporation
  • MIYASAKA Hiroo
    Surfance Science Research Center, Lion Corporation
  • KAWAI Takeshi
    Department of Industrial Chemistry, Science University of Tokyo Institute of Colloid and Interface Science, Science University of Tokyo
  • TANIMURA Toshiyuki
    Department of Industrial Chemistry, Science University of Tokyo
  • KON-NO Kijiro
    Department of Industrial Chemistry, Science University of Tokyo Institute of Colloid and Interface Science, Science University of Tokyo

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  • ナノ秒時間分解蛍光異方性によるカチオン界面活性剤一水系の相転移挙動の研究
  • Phase Transition Behavior of Cationic S

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The phase transition behavior of cationic surfactants with a double-chain (Arquad 2HT and Arquad 2O) in dilute aqueous solution is studied from -30 to 70°C by time resolved fluorescence anisotropy. The phase transitions of a coagel-gel and a gel-liquid crystal in the Arquad 2HT system are observed to take place at 36 and 42°C, as has also been noted for the dioctadecyldimethylammonium chloride-water system. The coagel-gel phase transition causes the distance separating the alkyl chains of Arquad 2HT to change, but this has no effect on chain fluctuation. Arquad 2O is assumed to be a liquid crystalline state at temperatures above -30°C.

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