engleski

Fractal Approach to the Liquid Crystal Formation of Alkylbenzenesulphonates in Solutions

A brief review of the phase behaviour of alkylbenzenesulphonates (ABS) with the length of a hydrocarbon chain containing to C8 - C15 carbon atoms, both, single-, and double-tailed (either symmetric or asymmetric), in water solutions, in mixed water/n-octanol solvent, and/or electrolyte, is presented. It was found that the structure of the micellar and liquid crystalline phases, either formed by the precipitation of surfactant from the electrolytic solution, or prepared as the equilibrated system, can be considered as self-similar. The processes from the molecular association profile up to the formation of aggregated particles, liquid crystalline phases, were followed by light scattering. The packing factors of ABS molecules were calculated by using the molecular dynamics. The fractal dimension, D, was determined from the slope of the straight line of a log/log plot assuming the power scattering equation, I(Q) ľ Q-D, using the light scattering data. The fractal structure of the samples was reflected in the behaviour of the pair distance function, p(r).

alkylbenzenesulphonates; fractal dimension; liquid crystal; pair distance function

Rad je kao predavanje prezentiran na skupu 11th International Symposium on Suryactants in Solution, održanom 1996.g., Jerusalem, Izrael.