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Surface Activity and Formation of Liquid Crystals of Didecyl Dimethyl Ammonium Bromide in Presence of Ethanol

Surface activity and formation of liquid crystals by didecyl-dimethyl ammonium bromide (DDAB) in presence of ethanol was studied. It was found that the c.m.c. and the area per molecule increased at ethanol concentration above 2 M, in which a significant change in solvent properties occurs. DDAB formed lamellar liquid crystals which were destroyed by the added ethanol, at concentration similar to that which prevented the formation of micelles