Abstract: Near-infrared(NIR) spectroscopy technique was used to study the states of water in reversed micelle formed from gemini quaternary ammonium surfactants C12-S2-C12·2Br in chloroform. The NIR spectroscopy of water could be categorized into three subbands corresponding to different water states. These water states were calculated into three kinds with molecular number of each surfactant molecular corresponding to dispersed solvent water ns, bulk like water nf and bound water nb. By mixing ionic surfactants dodecyltrimethylammonium bromide（DTAB） or dodecyltriethlyammonium bromide(DTEB) to the C12-S2-C12·2Br/chloroform system, it showed that with the increase of the molar fraction of added agent αA, ns and nb were increased, while nf was reduced; when nonionic surfactant octyl polyethylene glycol phenyl ethers(OP-10) was added, it showed that ns was reduced, while nb and nf were increased as αA was increased. It was found that the water solubilizing ability and states were influenced by the size of head group, electric charge and hydrophilicity of the surfactants.

Key words: C12-S2-C12·, 2Br, Reverse micelle, Near-infrared, Water states