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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.

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An on-lattice Monte Carlo model is implemented for the simulation of particle deposit growth by advection and diffusion towards a flat surface. The particle deposit structure is characterized by its bulk (density) and interface (mean height and surface width) properties. Numerical correlations, fitted by simple expressions, are reported for these magnitudes, relating them to time (number of deposited particles) and Peclet number. Also a heuristic argument is presented which relates deposit density to local diffusion-limited-aggregation-like processes and interfacial dynamics to the KPZ model.

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