Phase behaviour of n-alkyl- and bi-alkylbenzenesulphonates. Nematic lyotropics from double chain surfactants |
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| Authors: | D Te ak G Hertel H Hoffmann |
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| Institution: |
a Physical Chemistry Department I, University of Bayreuth, Bayreuth, Germany
b Laboratory of Physical Chemistry, Faculty of Science, University of Zagreb, Zagreb, Croatia, Yugoslavia |
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| Abstract: | The lyotropic mesophases in binary systems of surfactants in water: n-alkylbenzenesulphonates (C8-C12), two chain C12-surfactants, and dodecyl-benzenesulphonic acid, were investigated. The micellar properties were examined by conductometry and viscosimetry. The phase diagrams were determined using crossed polarizers, 2H NMR spectroscopy and polarization microscopy. Besides lamellar and inverse cubic phases, new nematic lyotropic phases have been found, presenting precursors for the lamellar phases, and exhibiting very fast alignment in a magnetic field. |
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