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We propose a "microscopic" model of gemini surfactants in aqueous solution.Carrying out extensive Monte Carlo simulations, we study the variation of thecritical micellar concentration (CMC) of these model gemini surfactants withthe variation of the (a) length of the spacer connecting the two hydrophilicheads, (b) length of the hydrophobic tail and (c) the bending rigidity of thehydrocarbon chains forming the spacer and the tail; some of the trends ofvariation are counter-intuitive but are in excellent agreement with theavailable experimental results. Our simulations also elucidate the dependenceof the shapes of the micellar aggregates and the magnitude of the CMC on thegeometrical shape and size of the surfactant molecules and the electricalcharge on the hydrophilic heads

Micellar aggregates of gemini surfactants: Monte Carlo simulation of a microscopic model