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Surfactants are amphiphilic molecules having a hydr ophilic or water soluble moiety (head group) and a hydrophobic, or water insoluble moiety (tail group) . Surfactants are not only related to soaps and det ergents, they are also in heavy demand for industrial processes r equiring colloid stability, metal treatments, miner al flotation, pesticides, oil production, pharmaceutical formulat ion, emulsion polymerization, particle growth and m any more. That is why surfactants have been and continue to b e a very active area of scientific research and com mercial growth for several decades. One interesting property of su rfactants is that at low concentrations, they exist solely as monomers. The formation of micelles, begins at a sp ecific surfactant concentration termed the critical micelle concentration (cmc), where the physical properties of the solution, such as interfacial tension, elect rical conductivity, and light scattering behaviour, often changes abruptly due to the existence of micelles. The formation of micelles will be able to calculate various therm odynamic parameters. These parameters make surfactants not only an interesting and rich area for the exploration of novel phenomena but also an area of research which can lead to new applications in a variety of fields. However, m ost of the previous studies on surfactants are limi ted to aqueous media only. Studies in mixed solvent media are very natural one as one can modulate the conformations of surfactants and their interactions easily by simply varying the composition of the media. With this c oncept, the research team of Eastern Nepal has started to work the solution properties of surfactants in different mixed solvent media in presence and absence of salts and has also investigated cationic and anionic surfactant inter action in mixed solvent media .

Investigation on solution properties of surfactants in mixed solvent media: Landmark towards Surface Chemistry in Eastern Nepal