Effects of salts and structure of chiral dopants on the induced pitch from micellar nematic phases
Küçük Resim Yok
Tarih
2000
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Royal Soc Chemistry
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The effect of adding salt to three different micellar chiral nematic phases, and the effect of structure of two chiral dopants, hexahydromandelic acid (HHMA) and mandelic acid (MA), on two achiral nematic host phases have been investigated. The addition of salt to the chiral nematic phases increased the pitch length, and a further addition led to cholesteric-lamellar phase transition. This phase transition was explained as fusion of individual micelles to coherent but defect rich bilayers. The effect of the structure of HHMA and MA on decylammonium chloride (DACl) and DL-serine hydrochloride decyl ester (DL-SDE) reflected itself in three different phenomena. (i) HHMA elevates the cholesteric-isotropic phase transition temperature, whereas MA lowers it, in general. (ii) The HHMA caused a change in diamagnetic anisotropy of DACl system, but MA has no such effect. (iii) The beta value of HHMA in DACl host phase was twice as large as that of MA, but it was only slightly different from that of MA in DL-SDE system. These phenomena and the chirality transfer were interpreted as a result of the shape of the chiral solute and solute-solvent interactions.
Açıklama
Anahtar Kelimeler
Micellar Nematic Phases, Chiral Dopants, Effects of Salts
Kaynak
Physical Chemistry Chemical Physics
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
2
Sayı
24