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Abstract
Dielectric relaxation of 4-(2-hexyloxyethoxy)4′-cyanobiphenyl (6O2OCB) enclosed in porous SiO2 matrix is presented and compared with the results of the substance in bulk. It was found that molecular reorientations in pores are faster than in bulk. The evidence of the isotropic–smectic phase transition is shown. Dynamics observed in isotropic liquid is of non-Arrhenius type while in smectic phase is of Arrhenius one. Comparison with the results concerning the substance enclosed in ZrO2 porous matrix is added.
Acknowledgements
The authors would like to thank Prof R. Dąbrowski (Military University of Technology, Warsaw, Poland) for 6O2OCB substance and Dr V. Gorbatchev and Dr L. Hartmann for valuable help during measurements. The work was partially supported by the grant No. 1 P03B 060 26 of the State Committee for Scientific Research (KBN).