Journal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume 576, Issue 1, Pages 98-105Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2013.789708
Keywords
Lyotropic liquid crystal; cholesteric phases; phase transition; brucine; helical twisting power; intrinsically biaxial micelles model
Funding
- Scientific and Technological Research Council of Turkey (TUBITAK) from Turkey
- Abant Izzet Baysal University Directorate of Research Projects Commission (BAP) from Turkey [2012.03.03.529]
- National Institute of Science and Technology on Complex Fluids (INCT-FCx) from Brazil
- CNPq from Brazil
- FAPESP from Brazil
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Lyotropic cholesteric liquid crystalline phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K2SO4)/1-undecanol (UndeOH)/water with brucine. The phase diagram was constructed as a function of the brucine concentration. Three cholesteric phases were identified: cholesteric biaxial, calamitic uniaxial, and discotic uniaxial. It was observed that there is a critical brucine concentration (X*(b)) to cholesterize the nematic host phase when the mixture is confined in a thin sample holder, below which the cholesteric helical arrangement is not achieved. The helical twisting power of brucine was calculated as 12.12 +/- 0.40m(-1).
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