Study of the cholesteric-to-cholesteric phase transitions on the lyotropic mixture of KL/K2SO4/1-undecanol/water/brucine presenting the cholesteric biaxial phase
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Dosyalar
Tarih
2013
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Taylor & Francis Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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).
Açıklama
1st Italian-Brazilian Workshop on Liquid Crystals -- AUG 26-30, 2012 -- Erice, ITALY
Anahtar Kelimeler
Lyotropic Liquid Crystal, Cholesteric Phases, Phase Transition, Brucine, Helical Twisting Power, Intrinsically Biaxial Micelles Model
Kaynak
Molecular Crystals And Liquid Crystals
WoS Q Değeri
Q4
Scopus Q Değeri
Q4
Cilt
576
Sayı
1
