An optical microscopy study of the biaxial - calamitic nematic lyotropic phase transition

被引：27
|
作者：
Oliveira, D. A. [1 ,2 ]
Luders, D. D. [1 ]
Souza, G. P. [1 ]
Kimura, N. M. [1 ]
Palangana, A. J. [1 ]
机构：
[1] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil
[2] Univ Tecnol Fed Parana, BR-87301100 Campo Mourao, Parana, Brazil
来源：
CRYSTAL RESEARCH AND TECHNOLOGY | 2009年 / 44卷 / 11期
关键词：
discotic nematic; biaxial nematic; calamitic nematic; LIQUID-CRYSTALS; TEMPERATURE; BEHAVIOR; MIXTURES;
D O I：
10.1002/crat.200900352
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Lyotropic nematic textures are investigated, using optical microscopy, near the reentrant isotropic (I-RE) - discotic nematic (N-D(-)) - biaxial nematic (N-B) - calamitic nematic (N-C(+)) - isotropic (I) phase transitions in a lyotropic mixture of potassium laurate, decanol and D2O. The N-B, intermediate phase between the two uniaxial nematic ones, is characterized by optical birefringence measurements. In this way, using a polarizing microscope and a colour CCD digital camera, the N-B - N-C(+) phase transition is identified as well as the domain of the N-B phase and N-D(-) - N-B transition point in accordance with optical birefringence data. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：1255 / 1258
页数：4
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