J. Phys. II France
Volume 2, Numéro 3, March 1992
Page(s) 383 - 400
DOI: 10.1051/jp2:1992140
J. Phys. II France 2 (1992) 383-400

Cylindrical growth of smectic A liquid crystals from the isotropic phase in some binary mixtures

R. Pratibha and N.V. Madhusudana

Raman Research Institute, Bangalore 560080, India

(Received 25 October 1991, accepted 28 November 1991)

In some binary mixtures of smectogenic and non-mesomorphic aliphatic compounds, the smectic A phase separates in the form of cylindrical structures. Our observations on some of these systems indicate that such structures are stabilised by a negative radial concentration gradient of the non-mesomorphic component. If the concentration of the non-mesomorphic component is allowed to increase in the isotropic phase, the cylindrical structures develop an undulation instability. It is argued that the concentration gradient leads to a spontaneous curvature in the smectic layers, which makes it necessary to include a term linear in curvature in the elastic energy density of such systems.

61.30E - 61.30C - 68.65

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