Kinetics of Lamellar to Gyroid Transition in a Nonionic Surfactant System

摘要

Kinetics of Lamellar to Gyroid Transition in a Nonionic Surfactant System has been investigated by means of a small angle x-ray scattering (SAXS) technique. For large ΔT(ΔT = T -T_(LG), T:temperature, T_(LG):lamellar to gyroid transition temperature) in the lamellar phase, the SAXS profiles can be described by a structure factor for undulation fluctuation lamellae. Approaching the temperature to the T_(LG), an excess diffuse scattering grows at lower Q(Q:magnitude of scattering vector) side of the first lamellar peak. This diffuse scattering arises from the modulation fluctuation of lamellar layer. At the T_(LG), the PFL transformed to the gyroid phase through a transient ordered structure having a rhombohedral symmetry.