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RISS 인기검색어
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- 저자 : V. M. Pergamenshchyk (검색결과 1 건)
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Macroscopic Properties of the Nematic Phase of Boomerang-Shaped ``C7": Evidence of Biaxiality
유재용,V. M. Pergamenshchyk,정지영,이긍원,신성태 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
We report the first evidence of macroscopic biaxiality of the nematic phase of the boomerang-shaped mesogen ODBP-Ph-C7 (C7). Studying the macroscopic alignment and the dielectric and the optical properties of the nematic phase of C7, we found effects that could be attributed only to the existence of three different dielectric constants and three different directors, which lay in the very definition of biaxiality. In contrast to the case of a uniaxial nematic liquid crystal, alignment of C7 cannot be labeled as homeotropic or planar: if one director is homeotropic then the other two are planar. We show that cells with different homeotropic directors and, consequently, different pairs of planar directors, to a certain extent are, equivalent to planar cells with different dielectric anisotropies. This difference, which is an unambiguous sign of biaxiality, is detected experimentally and turns out to be extremely sharp. The dielectric and the optical properties of C7 are found to undergo dramatic changes within the temperature range of the nematic phase. These data are summarized in a tentative phase diagram of C7, which shows that while the medium is elastically biaxial, its dielectric and optical properties can be uniaxial or even isotropic.
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