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Soft Matter and Biological Physics

Eur. Phys. J. E 4, 209-215

Lyotropic bicontinuous cubic phase single crystals investigated using high-resolved X-ray scattering

M. Impéror-Clerc and A.M. Levelut

Laboratoire de Physique des Solides, C.N.R.S. U.M.R. 8502, Bât. 510, Université Paris-Sud, 91405 Orsay Cedex, France


(Received 4 May 2000)

Single crystals of an $Ia\bar{3}d$ bicontinuous direct cubic phase formed by a non-ionic surfactant in water are investigated using high-resolved X-ray diffraction. The shape of the Bragg peaks confirms the existence of a 3D long-range order inside the cubic phase. A weak diffuse scattered intensity signal is measured very near the Bragg peaks. We attribute this signal to thermal diffuse scattering (TDS) and we give an estimation of the contribution of elastic waves to this TDS.

61.30.-v - Liquid crystals.
61.10.-i - X-ray diffraction and scattering.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2001