This chapter describes the brief introduction of the micellization of two cationic surfactants viz. dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB). Effect of methanol on micellization is elucidated by measuring the viscosity of surfactants in aqueous and 0.10, 0.20, 0.30 and 0.40 volume fractions of methanol in water at...