MONTE-CARLO SIMULATION OF A LATTICE MODEL FOR MICELLE FORMATION

We have investigated the aggregation into micelles of nonionic amphiph iles in water through Monte Carlo simulations of a very simple model s ystem. Amphiphiles and water are modeled, respectively, as three-site and one-site molecules on a square lattice. The model presents charact eristic properties of experimental micellization, namely, monomer vs a mphiphile concentration with a plateau above a ''critical'' concentrat ion (cmc) and a distribution of micelle sizes (polydispersity). Result s of the numerical experiment were compared with predictions from stat istical thermodynamic theory. Sample size and relaxation properties of the simulation have also been analyzed.