Abstract
Abstract The liquid crystal phases occurring with the cationic surfactants dodecyltrimethyl ammonium chloride (C12TAC) and hexadecyltrimethyl ammonium chloride (C16TAC) in water have been examined using differential scanning calorimetry, low-angle X-ray diffraction and, in particular, multinuclear magnetic resonance spectroscopy. The dependence of water (2H2O), chloride (35Cl), and surfactant (14N) quadrupole splittings (δ) on composition in the hexagonal and lamellar phase has been determined. For C12TAC, from the 14N δ values, the location and ordering of the NMe3 + was found to be almost independent of composition for the H1 phase, whereas at the higher surfactant concentration within the Lα phase the order increased gradually. Within the H1 phase the 35Cl δ values are highly sensitive to composition and temperature. This implies that the chloride ions reside between the head groups at the highest water concentrations and are squeezed out as temperature or surfactant concentration increases. Water 2H δ...
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