An optical conoscopy study of a reentrant discotic nematic-Biaxial nematic phase transition

被引：23
|
作者：
Braga, W. S. [1 ,2 ]
Santos, O. R. [1 ,2 ]
Sampaio, A. R. [1 ]
Kimura, N. M. [1 ]
Simoes, M. [3 ]
Palangana, A. J. [1 ]
机构：
[1] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil
[2] Univ Tecnol Fed Parana, BR-87301006 Campo Mourao, Parana, Brazil
[3] Univ Estadual Londrina, Dept Fis, BR-86051990 Londrina, PR, Brazil
来源：
JOURNAL OF MOLECULAR LIQUIDS | 2012年 / 170卷
关键词：
Discotic nematic; Biaxial nematic; Optical conoscopy; LYOTROPIC LIQUID-CRYSTAL; ORDER-PARAMETER; TEMPERATURE; MIXTURES; ANISOTROPY;
D O I：
10.1016/j.molliq.2012.03.007
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A fundamental phase diagram with lyotropic nematic liquid crystals was reported by Yu and Saupe a long time ago. Two uniaxial (calamitic-N-C and discotic-N-D) and one biaxial nematic (N-B) phases were determined by these authors. The phase diagram also predicted the existence of the N-D-N-B-N-D phase transitions. Along the years, this phase diagram has been studied by several authors and yet these phase transitions have not been observed. In this work, we present a study of this phase sequence through optical conoscopy. The occurrence of these phase transitions is here investigated and optically characterized through conoscopic image. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：72 / 75
页数：4
相关论文
共 50 条
  • [41] SMECTIC-A NEMATIC PHASE-TRANSITION IN A SYSTEM OF BIAXIAL MOLECULES
    AVERYANOV, EM
    PRIMAK, AN
    LIQUID CRYSTALS, 1993, 13 (01) : 139 - 152
  • [42] NMR-STUDY OF ALLOYS EXHIBITING A REENTRANT NEMATIC PHASE
    DONG, RY
    JOURNAL OF CHEMICAL PHYSICS, 1981, 75 (06): : 2621 - 2625
  • [43] X-RAY STUDY AND MICROSCOPIC STUDY OF REENTRANT NEMATIC PHASE
    GUILLON, D
    CLADIS, PE
    STAMATOFF, J
    PHYSICAL REVIEW LETTERS, 1978, 41 (23) : 1598 - 1601
  • [44] Critical behavior of the optical birefringence at the nematic to twist-bend nematic phase transition
    Pociecha, Damian
    Crawford, Catriona A.
    Paterson, Daniel A.
    Storey, John M. D.
    Imrie, Corrie T.
    Vaupotic, Natasa
    Gorecka, Ewa
    PHYSICAL REVIEW E, 2018, 98 (05)
  • [45] ''In-situ photopolymerization'' of discotic crystalline acrylates in the discotic nematic phase
    FavreNicolin, CD
    Lub, J
    VanderSluis, P
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1997, 299 : 157 - 162
  • [46] Modeling of nematic columnar to nematic discotic phase transitions by the extended McMillan theory.
    Kouwer, PHJ
    Jager, WF
    Mijs, WJ
    Picken, SJ
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2001, 222 : U376 - U376
  • [47] Exploring the nematic to twist-bend nematic phase transition: calorimetric and optical measurements
    Parvin, Apsari
    Mitra, Smriti
    Das, Malay Kumar
    Chakraborty, Susanta
    Kanakala, Madhu Babu
    Yelamaggad, Channabasaveshwar Veerappa
    LIQUID CRYSTALS, 2024, 51 (10) : 1676 - 1689
  • [48] PHASE-BEHAVIOR AND OPTICAL-PROPERTIES OF BIAXIAL NEMATIC POLYMERS
    FINKELMANN, H
    HERR, RP
    HESSEL, F
    PAUSCHINGER, D
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 1987, 194 : 167 - COLL
  • [49] A series of novel liquid crystalline polymers showing a nematic discotic and/or a nematic columnar phase
    Kouwer, PHJ
    Gast, J
    Jager, WF
    Mijs, WJ
    Picken, SJ
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 2001, 364 : 225 - 234
  • [50] Neutron scattering studies on reentrant nematic phase
    Mitra, M
    Paul, R
    Paranjpe, SK
    Deniz, KU
    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, 1997, 303 : 103 - 108
12345