关键词: 层状液晶, 表面活性剂, 2H NMR, 小角X射线衍射

Abstract: The measurements of ²H NMR gave three reasons for the decrease of the stability of lamellar liquid crystal in SDS/C₁₀OH/solvents when formamide was used as the solvent instead of waters the order parameter of SDS and C₁₀OH decreased, the degression of order parameter of SDS and C₁₀OH along the carbon chain increased and the compatibility of SDS with C₁₀OH decreased. The low angle X-ray measurements show that the permeability of the solvent in the lamellar liquid crystal was increased when water was replaced by formamide so that the interlayer spacing d decreased at a certain weight ratio of C₁₀OH/SDS and the dependence of the interlayer spacing d on the weight ratio of SDS/C₁₀OH changed.

Key words: Lamellar liquid crystal, Surfactant, ²HNMR, Low angle X-ray