Intermediate liquid crystalline phases in the binary system C16TACl-H2O: an NMR and low-angle x-ray diffraction study

Abstract

The liquid crystalline phases formed in the concentration range between the hexagonal and the lamellar phase in the binary system C 16 TACl-H 2 O have been studied by 2 H, 14 N, and 35 Cl NMR, low-angle X-ray diffraction and optical microscopy. A cubic phase and three anisotropic so-called intermediate phases have been found. At 45 o C the hexagonal phase is stable up to 75 wt % C 16 TACl. Between 75% and 79%, a biaxial phase (Int-1) built up by long rods with noncircular cross sections is formed