Study of the cholesteric-to-cholesteric phase transitions on the lyotropic mixture of KL/K2SO4/1-undecanol/water/brucine presenting the cholesteric biaxial phase

Akpınar, ErolReis, DennysFigueiredo Neto, Antonio Martins2021-06-232021-06-2320131542-14061563-5287https://doi.org/10.1080/15421406.2013.789708https://hdl.handle.net/20.500.12491/75251st Italian-Brazilian Workshop on Liquid Crystals -- AUG 26-30, 2012 -- Erice, ITALYLyotropic 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).eninfo:eu-repo/semantics/closedAccessLyotropic Liquid CrystalCholesteric PhasesPhase TransitionBrucineHelical Twisting PowerIntrinsically Biaxial Micelles ModelStudy of the cholesteric-to-cholesteric phase transitions on the lyotropic mixture of KL/K2SO4/1-undecanol/water/brucine presenting the cholesteric biaxial phaseConference Object10.1080/15421406.2013.7897085761981052-s2.0-84879641955Q4WOS:000320358100013Q4