Lyotropic mixture made of potassium laurate/1-undecanol/K2SO4/water presenting high birefringences and large biaxial nematic phase domain: a laser conoscopy study
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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| Data(s) |
05/11/2013
05/11/2013
2012
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| Resumo |
The lyotropic liquid crystalline quaternary mixture made of potassium laurate (KL), potassium sulphate, 1-undecanol and water was investigated by experimental optical methods (optical microscopy and laser conoscopy). In a particular temperature and relative concentrations range, the three nematic phases (two uniaxial and one biaxial) were identified. The biaxial domain in the temperature/KL concentration surface is larger when compared to other lyotropic mixtures. Moreover, this new mixture gives nematic phases with higher birefringence than similar systems. The behavior of the symmetric tensor order parameter invariants sigma(3) and sigma(2) calculated from the measured optical birefringences supports that the uniaxial-to-biaxial transitions are of second order, described by a mean-field theory. Scientific and Technological Research Council of Turkey (TUBITAK) Scientific and Technological Research Council of Turkey (TUBITAK) FAPESP FAPESP CNPq CNPq |
| Identificador |
EUROPEAN PHYSICAL JOURNAL E, NEW YORK, v. 35, n. 6, supl. 1, Part 3, pp. 36-41, JUN, 2012 1292-8941 http://www.producao.usp.br/handle/BDPI/41110 10.1140/epje/i2012-12050-9 |
| Idioma(s) |
eng |
| Publicador |
SPRINGER NEW YORK |
| Relação |
EUROPEAN PHYSICAL JOURNAL E |
| Direitos |
restrictedAccess Copyright SPRINGER |
| Palavras-Chave | #LIQUID-CRYSTAL MIXTURES #ORDER-PARAMETER #TRANSITIONS #TEMPERATURE #BEHAVIOR #PARTICLES #MOLECULES #RODLIKE #SYSTEM #MODEL #CHEMISTRY, PHYSICAL #MATERIALS SCIENCE, MULTIDISCIPLINARY #PHYSICS, APPLIED #POLYMER SCIENCE |
| Tipo |
article original article publishedVersion |
