Study of Type I Lyomesophases by X-ray Diffraction

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Abstract
Type I lyomesophase LK (K laureate/KCl/water) and CDS (Cs decyl sulfate/CsNO3/water) were studied by small angle X-ray diffraction and polarized optical microscopy. Different containers were used and sampl;es studied under the influence of applied magnetic and electric fields. Residual magnetic orientation, obtained in thicker L K samples, gave diffraction results compatible with a model of finite cylinders for the amphiphilic micelles; only an iner band in the region of 140 Å is preseented in this case. The same sample in presence of an electric field of 14 kV/cm presents a weak outer band at 43 Å. Surface effects in thinner samples correspond to the strenghtening of the outer, which has been associated with clustering of the cylinders and segregation of water. Surface effects are stronger in LK than in CDS. These results indicated that the interaction with surface is of electrostatic origin.