Dielectric Relaxation Phenomena of a Liquid Crystal Monolayer at the Air-Water Interface

概要

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The dielectric relaxation phenomena of a 4-cyano-4′-5-alkyl-biphenyl (5CB) monolayer at the air-water interface have been investigated. Maxwell displacement current (MDC; I)-area per molecule (:A) isotherms and surface pressure (:π)–A isotherms were measured at several monolayer compression ratios. The dipole moment (:mZ)–A isotherm and dmZ/ dt–A isotherm were evaluated from the I–A isotherm. It was found that in the range (range 2) where the surface pressure is almost zero, mZ tends to increase at wide A as the compression ratio becomes small, whereas mZ–A isotherms coincide for various compression ratios in the range where the surface pressure increases by monolayer compression. These results indicate that the compression process of a 5CB monolayer in range 2 is a non-equilibrium process. Relaxation time (:τ)–A isotherm and dipole moment at equilibrium state (:mZ eq)–A isotherm were evaluated for the first time using the equation d(mZ–mZ eq)/ dt=-(mZ–mZ eq)/τ, which represents the dielectric relaxation process.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
1997-08-15