Conductance, apparent molar volume and compressibility studies of cetyltrimethylammonium bromide in aqueous solution of leucine

► Leucine-CTAB interactions are sensitive to solution conditions e.g. temp., pH and conc. ► Density, sound velocity and conductance are measured at different temp. ► Presence of electrostatic and hydrophobic interactions is manifested. ► Interactions result on account of favorable enthalpy and entropy parameters. ► The volumetric and conductance studies are in agreement with fluorescence studies.