Alignment Structure of Nonsymmetric Dimeric Liquid Crystal Molecules
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概要
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Antiferroelectric liquid crystals (AFLCs) composed of low-mass mesogens do not show the nematic (N) phase. Recently, it has been reported that an AFLC containing dimeric molecules may show the N phase. However, it is not obvious why the antiferroelectric SmC (SmCA) and N phases coexist in the phase sequence of the dimeric LC. In this study, the molecular alignment structure has been investigated by polarized Fourier transform infrared spectroscopy (FT-IR) and X-ray diffractometry (XRD). As a result, it is found that nonsymmetric dimeric LCs, $m$PY11OCB ($m = 6$ and 8), have the same layer spacing between the SmA and SmCA phases, and therefore, the molecular shape is bent even in the SmA phase. The difference between both phases is due to the thermal motion of bent molecules around the molecular axis. Furthermore, it is obvious that in the SmCA phase, the alignment of nonsymmetric dimeric LC molecules can be localized in two directions in a cell with rubbed alignment films.
- 2009-09-25
著者
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Furue Hirokazu
Department Of Electronics And Computer Science Faculty Of Science And Engineering Science University
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Yoshizawa Atsushi
Department Of Applied Chemistry Graduate School Of Science And Engineering Tokyo Institute Of Techno
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Furutani Masaya
Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
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Ito Ayano
Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510, Japan
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