Abstract
Abstract The binary lyotropic liquid crystal system CsPFO/water is one which has been extensively studied in recent years [1] since the system contains a nematic phase, (ND), over an unprecedented range of temperature and concentration of exceptional stability. This phase is bordered at higher temperatures by an isotropic micellar phase, (L1), and at lower temperatures by a defected lamellar phase (LαH). A non-ionic hydrophilic polymer, poly(ethylene oxide) (PEO), has been added to the system replacing some water molecules. Optical microscopy agrees with previously reported results [2] showing that at 0.9% PEO the lamellar phase is replaced by a phase with a nematic-type texture, (N*). This system is unusual in polymer-surfactant systems in that the polymer addition causes a phase change from a lamellar phase to a magnetically orientatable phase. We have used small angle neutron scattering (SANS), optical microscopy and 2H NMR to investigate both the LαH and N* phases in order to understand the structural...
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