Abstract: Watersoluble NaCl nanoparticles were prepared by reacting NaAc with HCl in ethanol/Brij 30/hexadecane microemulsion.The particles obtained are crystalline spheres with an average particle size of about 60 nm.In the case of using formamide/AOT/nheptane microemulsion as the reaction medium,NaCl particles can only be obtained by adding precipitant after the reaction.The latter particles are crystalline cubes with a much larger particle size(1 μm).The results show that nonaqueous reverse microemulsion may provide a new medium for the preparation of watersoluble nanoparticles and the choice of the polar solvent is critical to obtain nanosized materials.

Key words: Nanoparticles, Nonaqueous microemulsion, Surfactant, Brij 30, NaCl