DYNAMIC UNIVERSALITY IN A CRITICAL MIXTURE OF A NONIONIC MICELLAR SOLUTION

The decay rate of critical fluctuations in a nonionic micellar solution of tetraethylene glycol n-decylether (C10E4) in water has been investigated very close to its critical point of mixing from the time-dependent correlation function of scattered light. We find the scaled decay rate GAMMA-c* (= [6-pi-eta(T)/k(B)T](GAMMA-GAMMA-B)/k3) for C10E4 in water obeys a universal function over the range from a scaled variable of k-xi congruent-to 0.3-26, where GAMMA-B is the noncritical background contribution. Our experimental findings suggest that the micellar solution of C10E4 in water should belong to the static and the dynamical universality class as a fluid, in conjunction with our previous works [K. Hamano et al., Phys. Lett. A 150, 405 (1990); J. Chem. Phys. 94, 2172 (1991).