2003 Volume 3 Issue 6 Pages 287-294,286
Critical anomaly of multicomponent surfactant solutions, cationic surfactant (BTDAB), nonionic surfactant (C14E7), and anionic surfactant (SDS) with the addition of salts, were examined in terms of the renormalized Ising model and double critical behaviors by means of light scattering, turbidity, viscosity, and coexistence curve measurements. Fisher's renormalized Ising model behavior was observed clearly. In case of SDS with butanol and NaCl, a closed loop type phase diagram appeared. Approaching the double critical point, crossover to doubling of the critical exponents was obtained, and the critical universality was ascertained including the double critical nature. Dynamic critical behaviors were well reproduced by the modified dynamical droplet model in a unified manner taking the finite micellar size effect.
