Abstract
The bilayer phase transitions of double-chain cationic surfactants, dialkyldimethylammonium bromides (2CnBr), at ambient and high pressures were investigated. The 2CnBr bilayers underwent a single or multiple phase transitions depending on the alkyl-chain length. The temperature-pressure phase diagrams and thermodynamic quantities of the 2CnBr bilayers for the phase transitions were determined from their phase-transition data. We could comprehensively interpret the complicated phase behavior of the 2CnBr bilayers, which has not been revealed by conventional experimental methods at ambient pressure.
