For the point of view of electrooptics applications, the sol-gel process [1] has been adapted [2, 3] for trapping microdroplets of nematogenic organic cornpounds (i.e. liquid crystals, LCs) in a thin-film of a silica-gel based matrix. The LC compounds are dissolved in the starting mixture, loosing their particular properties; further hydrolysis and polycondensation reactions lead to a phase separation that results in the formation of pores which are filled with the organic compound. If adequate processing of the formation of the microdroplets is achieved, the organic compound can gradually recover its nematic LC state. The LC molecules can be oriented in microdomains according to the pore innersurface anchoring that originates from the organic groups on the walls of the pores, e.g. orienting properties induced by -CHH3, -C2H5, -C6H5, etc. Once the phase separation in the Glass Dispersed Liquid.Crystals (GDLC) formation takes place, (LC microdroplets dispersion, figure 1), the LC concentration used in the starting solution becomes simply a figure related to the number and the compactness of microdroplets within the silica-gel matrix. To characterize the orientation and the shape of the microdroplets, the samples were analyzed with a microscope between crossed polarizers, and a radial orientation corresponding to a homeotropic surface condition was obtained in practically all GDLCs, as shown by a characteristic “maltese cross” pattern in the droplets (figure 1).


Liquid Crystal Glass Producer Disperse Liquid Transparent Condition Maltese Cross 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    C.J. Brinker, G.W. Scherer, Sol Gel Science, Academic Press Inc., San Diego (1990)Google Scholar
  2. 2.
    D. Levy, C.J. Serna, J.M. Otón, Preparation of Electrooptical Active Liquid Crystal Microdomains by the Sol-Gel Process, Mat. Lett., 10, 470 (1991)Google Scholar
  3. 3.
    J. M. Otón, A. Serrano, C.J. Serna, D. Levy, Glass Dispersed Liquid Crystals, Liq. Cryst., 10, 733 (1991)CrossRefGoogle Scholar
  4. 4.
    D. Levy, J.M.S. Pena, C.J. Serna, J.M. Otórn, Glass Dispersed Liquid Crystals for Electro-optical Devices, J. Non-Cryst. Solids, 147–148, 646 (1992)CrossRefGoogle Scholar
  5. 5.
    D. Levy, A. Serrano, J.M. Otón, Electrooptical Properties of Gel-Glass Dispersed Liquid Crystals, J. Sol-Gel Sci. Tech., 2, 803 (1994)CrossRefGoogle Scholar
  6. 6.
    D. Levy, C.J. Serna, A. Serrano, J. Vidal, J.M. Oton, Gel-Glass Dispersed Liquid Crystal Optical Shutters, Sol-Gel Optics II, in: SPIE Proceedings, J. D. Mackenzie (editor), 1758, 476 (1992)CrossRefGoogle Scholar
  7. 7.
    D. Levy, X. Quintana, C. Rodrigo, J.M. Otón, Gel-Glass Dispersed Liquid Crystal Projection Displays, Sol-Gel Optics III, in: SPIE Proceedings, J. D. Mackenzie (editor), 2288, 529 (1994)CrossRefGoogle Scholar
  8. 8.
    D. Levy, F. del Monte, X. Quintana, J.M. Otón, Color Displays with Gel-Glass Dispersed Liquid Crystals, J. Sol-Gel Sci. Tech., 8, 1063 (1997)Google Scholar

Copyright information

© Springer Science+Business Media New York 2004

Authors and Affiliations

  • D. Levy

There are no affiliations available

Personalised recommendations