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Abstract
The dielectric relaxation spectrum over the frequency range 102 to 1.8×109 Hz of 4‐octyl‐4′‐cyanobiphenyl, 8CB, in bulk and confined to 200 nm diameter cylindrical pores is reported. We used matrices with parallel cylindrical pores, obtaining different alignments of the molecular director depending on the treatment. Results show that there are two relaxations in the isotropic phase and in the mesophases for parallel alignment and three for perpendicular alignment. The molecular origin of theses modes and the effect of the confinement on their dynamics are discussed. To compare properly the results for bulk and confined 8CB, a re‐scaling of the experimental data is proposed.
Acknowledgments
This work was supported by the University of País Vasco (Project No. 9/UPV060.310‐13562/2001), the MCYT of Spain (Projects No. MAT 2003‐07806‐C02‐02 and BFM2002‐01425) and the Generalitat de Catalunya (DURSI grant SGR2002‐00152). D.O.L. acknowledges the Gobierno Vasco for an invited position at the University of País Vasco.