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

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

Lyotropic nematic textures are investigated, using optical microscopy, near the reentrant isotropic (IRE) ‐ discotic nematic (ND‐) ‐ biaxial nematic (NB) ‐ calamitic nematic (NC+) ‐ isotropic (I) phase transitions in a lyotropic mixture of potassium laurate, decanol and D2O. The NB, intermediate pha...

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Veröffentlicht in:Crystal research and technology (1979) 2009-11, Vol.44 (11), p.1255-1258
Hauptverfasser: Oliveira, D. A., Luders, D. D., Souza, G. P., Kimura, N. M., Palangana, A. J.
Format: Artikel
Sprache:eng
Schlagworte:
biaxial nematic
Birefringence
calamitic nematic
Charge coupled devices
discotic nematic
Nematic
Neodymium
Optical microscopy
Phase transformations
Surface layer
Texture
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Zusammenfassung:Lyotropic nematic textures are investigated, using optical microscopy, near the reentrant isotropic (IRE) ‐ discotic nematic (ND‐) ‐ biaxial nematic (NB) ‐ calamitic nematic (NC+) ‐ isotropic (I) phase transitions in a lyotropic mixture of potassium laurate, decanol and D2O. The NB, 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 NB – NC+ phase transition is identified as well as the domain of the NB phase and ND‐ – NB transition point in accordance with optical birefringence data (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0232-1300
1521-4079
DOI:10.1002/crat.200900352