STRUCTURAL FEATURES OF THE CUBIC PHASE OF A TERNARY SURFACTANT SYSTEM

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Abstract
We have studied the cubic phase formed by the ternary system water/didodecyldimethylammonium bromide/octane using small-angle x-ray and neutron scattering. We have observed the existence of more than one symmetry in this cubic region, with a transition from primitive to body centred cubic symmetry on increasing the water content of the system. Our results are consistent with a bicontinuous periodic structure of constant mean curvature. We also report rheological measurements which indicate that the ringing behaviour of the cubic samples is associated with a sharp increase in the quality factor as audible frequencies are approached

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