陽離子表面活性劑／醇／水三元體系液晶的研究

The ternary phase diagram of 3-alkoxy-2-hydroxypropyl trimethyl ammonium bromide-n-butanol-water was drawn based on experimental data at 298K. The lyotropic liquid crystals appearing different colors were observed under polarized light microscopy. Some florid multicolor photographs clearly showing texture structure of liquid crystal were obtained using polarizing-light microscope. Small-angle X-ray scattering (SAXS), 2H(deuterium) quadrupolar splitting (2H NMR) were employed to confirm the structure of these liquid crystals. The structural transformation of these special lyotropic liquid crystals was confirmed by differential scanning calorimetry (DSC). The influences of liquid crystal film thickness and temperature or time on the transformation of color of liquid crystal have been investigated, respectively. And the multicolor textures can be seen only when the film thickness is over several microns. It was found that the liquid crystal film thickness is the key factor for appearing different colors.