Conductivities of dodecyldimethylbenzylammonium chloride in aqueous solutions were studied in the 15−35 °C temperature range at 5 °C intervals. Densities of the solutions were studied at 15, 20, and 25 °C.
Adiabatic compressibility of the aqueous solutions of the surfactant has been determined from measurements
of ultrasound velocity and density at 25 °C. The methods yielded identical critical micelle concentration
(cmc) values. Conductivity results show a shallow minimum of the cmc values at around 25 °C. The ionization
degree of micelles, β, increases, whereas the standard free energy of micellization,
decreases upon
growth of temperature. From density data for the surfactant, the change of the apparent molar volume upon
micellization was calculated. The apparent adiabatic compressibility for the micelle of the surfactant at 25 °C
was estimated. For comparative purposes we have measured additionally the conductivity of the decyl
homologue at 30 °C to estimate the cmc and β values, and at 25 °C to estimate the value of the limiting
equivalent conductivity.
Apparent and partial molar volumes of decyldimethylbenzylammonium chloride (C10DBACl) at (15, 25,
and 35) °C have been calculated from results of density measurements. The specific conductivities of the
solutions have been determined at the same temperatures. The results served for the estimation of critical
micelle concentration, cmc, ionization degree, β, and standard free energy of micellization,
, of the
surfactant. From equivalent conductivity measured at 25 °C in the low concentration range, the transport
number of the C10DBA+ cation has been estimated. The aggregation number, n, of the micelles has been
estimated from the conductivity data.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.