Abstract
Conductance measurements are reported for double chain surfactants like N,N,N-octylpentyldimethylammonium (OPAC) and N,N,N-octyloctyldimethylammonium chlorides (OOAC) in water-β-cyclodextrin solution. From the specific conductivity data, the apparent critical micelle concentration (cmc ∗) and the degree of counterion dissociation (β) were obtained at a fixed β-CD concentration ( m βCD = 0.01190 mol kg −1, besides from the cmc ∗ value and that in water (cmc) the stoichiometry of the surfactant-β-CD complex was calculated. Densities, heat capacities, enthalpies of dilution at 298 K and osmotic coefficients at 310 K were measured for the same systems; the apparent molar volumes, V λ , and heat capacities, C λ , of two surfactants in β-CD solution, calculated as functions of surfactant concentrations m s, have made possible to obtain the properties of transfer of the surfactant from water to β-CD-water solutions.
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