We study the time evolution of an N-component model of bicontinuous microemulsions based on a time-dependent Ginzburg-Landau (GL) equation quenched from a high-temperature uncorrelated state to the low-temperature phases. The behaviour of the dynamical structure factor C ($) over tilde(k, t) is obtained, in each phase, in the framework of the large-hr limit with both conserved (COP) and non-conserved (NCOP) order parameter dynamics. At zero temperature the system shows multiscaling in the unstructured region up to the tricritical point for the COP, whereas ordinary scaling is obeyed for NCOP. In the structured phase, instead, the conservation law is found to be irrelevant and the form C ($) over tilde(k, t) similar to t(a/z) f(\ k - k(m) \ t(1/z)), with alpha = 1 and z = 2, is obtained in every case. Simple scaling relations are also derived for the structure factor as a function of the final temperature of the thermal bath.
Time-dependent Ginzburg-Landau Equation For An N-component Model of Self-assembled Fluids
MARINI BETTOLO MARCONI, Umberto;
1995-01-01
Abstract
We study the time evolution of an N-component model of bicontinuous microemulsions based on a time-dependent Ginzburg-Landau (GL) equation quenched from a high-temperature uncorrelated state to the low-temperature phases. The behaviour of the dynamical structure factor C ($) over tilde(k, t) is obtained, in each phase, in the framework of the large-hr limit with both conserved (COP) and non-conserved (NCOP) order parameter dynamics. At zero temperature the system shows multiscaling in the unstructured region up to the tricritical point for the COP, whereas ordinary scaling is obeyed for NCOP. In the structured phase, instead, the conservation law is found to be irrelevant and the form C ($) over tilde(k, t) similar to t(a/z) f(\ k - k(m) \ t(1/z)), with alpha = 1 and z = 2, is obtained in every case. Simple scaling relations are also derived for the structure factor as a function of the final temperature of the thermal bath.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
