Abstract
Abstract A binary system decylammonium—d-21 chloride water and a ternary system with a small amount of ammonium chloride have been studied over a wide range of water content by deuterium magnetic resonance. For the binary system a lamellar phase is formed, which on dilution becomes a two phase system lamellar/type II DM nematic. There is a large isotope effect in the composition, at which the two phase region occurs. The ternary system passes directly from the lamellar phase to a nematic system at a phase transition. The segmental motions in the deuteriocarbon chains are independent of the mesophase formed and of the electrolyte content. Large contributions to the degree of order of segments arise from co-operative motions of the whole bilayer and these are significantly different in the lamellar and type II DM, with and without electrolyte.
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