The Poley absorption in liquid crystals |
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| Institution: | 1. PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France;2. Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, 75005, Paris, France;1. Shri Maneklal M. Patel Institute of Sciences & Research, kadi sarvavishwavidyalaya, Gandhinagar, Gujarat, India;2. Henan Provincial Key Laboratory of Pediatric Hematology, Children’s Hospital Affiliated to Zhengzhou University, Henan Children’s Hospital, Zhengzhou Children’s Hospital, Zhengzhou 450018, China;3. School of Pharmaceutical Science, Zhengzhou University, Zhengzhou, Henan 450001, China;4. Key Laboratory of Advanced Drug Preparation Technologies (Zhengzhou University), Ministry of Education of China, Zhengzhou 450001, China;5. Chemistry Department, Faculty of Science, The M.S. University of Baroda, Vadodara, India;1. University of the Basque Country (UPV/EHU), Energy Engineering Department, Faculty of Engineering, Plaza Ingeniero Torres Quevedo, 1, 48013 Bilbao, Spain;2. CIEMAT, Avda. Complutense 40, 28040, Madrid, Spain |
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| Abstract: | The far infrared torsional oscillatory absorption of a nematic liquid crystal has been isolated for the first time free of higher frequency proper modes. This has been achieved using a molecule specially synthesised for this purpose with a dipole moment engineered perpendicular to the long axis so that torsional oscillation about this axis modulates this component only. The far infra-red power absorption of the liquid crystal in the isotropic, nematic, solid and supercooled conditions is therefore a Poley absorption, i.e. the torsional oscillation about the rigid long axis of the liquid crystal molecule itself. The effect of phase changes on a macroscopic level is to sharpen and intensify this absorption. This is clear evidence to the effect that phase changes in liquid crystals are cooperative phenomena, the molecular librational dynamics about the long axis are little different from those in a regular molecular liquid. |
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