界面活性剤集合体のESRスピンプローブ法による研究

概要

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The behavior of surfactant aggregates in solutions was investigated by an ESR spin probe method. The following informations were obtained from analysis of spectra. <BR>1) Two types of micelles were directly observed in commercially available sodium alkyl poly (oxyethylene) ether sulfate-alkyl poly (oxyethylene) ether mixed surfactant solutions. <BR>2) Sodium dodecyl sulfate molecules (2 mM) incorporated into phospholipid bilayers (13.6 mM) formed clusters by themselves, causing phase separation of the bilayers. <BR>3) Sodium 3- dodecyloxypoly (oxyethylene) -1-propane sulfonates interacted with an ESR spin probe even below the cmc. This was explained by the formation of ESR spin probe-induced micelles. <BR>4) Butyl poly (oxypropylene) ether derivatives having polar dissociative functional groups on their terminal hydroxyl groups behaved in a manner similar to a reversed micelle or a W/O microemulsion system and were inverted to an O/W type through a transparent and viscoelastic gel stage with increasing a water content.
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