A series of quaternary alkyl halide salts of 1,4-diazabicyclo[2.2.2]octane (DABCO) exhibited first-order phase transitions in the temperature range of 62–100 °C Abrupt changes of halide anion conductivities were observed by two to three orders of magnitude at the transition temperatures. The transition temperature and the heat of transition tend to increase with the increase of the alkyl chain length
Self-assembly of symmetrical and dissymmetrical dicationic surfactants in the solid phase and in solution
作者:E. A. Karpichev、L. Ya. Zakharova、N. K. Gaisin、O. I. Gnezdilov、E. P. Zhil’tsova、T. N. Pashirova、S. S. Lukashenko、A. V. Anikeev、O. A. Gorban’、A. I. Konovalov、A. F. Popov
DOI:10.1007/s11172-014-0396-y
日期:2014.1
The effect of the spacer structure (linear, cyclic, bicyclic) and dissymmetry of alkyl fragment in a series of dicationic gemini surfactants on the ability to form thermotropic liquid crystals and on the micellar properties was studied. Transitions crystal-thermotropic liquid crystals-isotropic solution were studied using differential scanning calorimetry and optical microscopy. The self-diffusion