Study of optical conoscopy in uniaxial and biaxial nematic lyotropic phases

作者：Santos O R; Braga W S; Luders D D; Kimura N M; Simoes M; Palangana A J^*

来源：Journal of Molecular Liquids, 2014, 197: 120-123.

DOI：10.1016/j.molliq.2014.05.005

• Uniaxial nematic
• Positive biaxial nematic
• Negative biaxial nematic
• Induced biaxial nematic

The calamitic nematic (N-C)-biaxial nematic (N-B)-discotic nematic (N-D) phase transitions are studied in a potassium laurate-decanol-potassium sulfate and water mixture by optical conoscopy. The N-C(-)(N-D(+)) phase is uniaxially negative (positive) as expected. A biaxial negative (N-B(-)) nematic phase is optically characterized and confirmed through conoscopic image, inside the biaxial range, beyond the known biaxial positive (N-B(+)) nematic phase. Conoscopic image of a biaxial nematic induced by material flow from N-D(+) phase is investigated and discussed in this work.

• 出版日期2014-9