Phase behaviour and physical properties of the cationic quaternary system tetradecyldimethylamine oxide hydrochloric acid 1-hexanol water |
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Authors: | R Beck M Gradzielski K Horbaschek S S Shah H Hoffmann P Strunz |
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Institution: | Lehrstuhl für Physikalische Chemie I Universit?t Bayreuth D-95440 Bayreuth Germany e-mail: Reiner.Beck@uni-bayreuth.de Tel.: +49-921-552765, DE Hahn-Meitner-Institut Glienicker Strasse 100 D-14109 Berlin, Germany, DE
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Abstract: | The phase behaviour and properties of the tetradecyldimethylamine oxide/HCl/hexanol/water quaternary surfactant system have
been studied by means of electric conductivity, rheology, freeze-fracture transmission electron microscopy (FF-TEM) and small-angle
neutron scattering (SANS). In this system the originally zwitterionic surfactant can become increasingly charged by protonation
through the addition of HCl, i.e. the degree of charging can be changed continuously. An interesting, isotropic phase (L1
* phase) of low viscosity was observed for intermediate degrees of charging. From viscosity and conductivity measurements this
phase can clearly be distinguished from the conventional L1 phase that is composed of micelles. Investigation of the structures present by means of FF-TEM and SANS showed that the L1
* phase is made up of unilamellar vesicles of extremely small diameter of 8–10 nm. Evidently such highly curved structures
are stabilized by the electrostatic conditions in this system.
Received: 11 July 1999/Accepted: 25 August 1999 |
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Keywords: | Small vesicles Phase behaviour Small-angle neutron scattering Charged surfactants |
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