Studies on Induced Smectic Phases (II) Transition Enthalpies, X-ray Patterns and Layer Spacings of Orthogonal Phases of Binary Mixtures of Nematogens with Contrasting Dielectric Anisotropies

1982 ◽  
Vol 17 (10) ◽  
pp. 1315-1320 ◽  
Author(s):  
J. Szabon ◽  
S. Diele
Keyword(s):  
Binary Mixtures ◽  
X Ray ◽  
Smectic Phases ◽  
Ray Patterns ◽  
Induced Smectic Phases

Induced Smectic Phases I. Polymorphism in Binary Mixtures of Alkyloxybenzylidene-alkylanilines with Alkyl- and Alkyloxy- cyanobiphenyls

1981 ◽  
Vol 36 (1) ◽  
pp. 62-67 ◽  
Author(s):  
F. Schneider ◽  
N. K. Sharma
Keyword(s):  
Chain Length ◽  
Binary Mixtures ◽  
Transition Temperatures ◽  
Mean Values ◽  
Smectic Phases ◽  
The Mean ◽  
Induced Smectic Phases

The diagrams of state of mixtures of 4-n-alkyloxybenzylidene-4'-n-butylanilines with 4-n- alkyl- and 4-n-alkyloxy-4'-cyanobiphenyls are studied. The mixtures form induced smectic phases of type SA, SB and SE. In all three smectic phases the thickness of the smectic layers agrees with the mean values of the molecular lengths. In most cases the induced SA phases do not show uninterrupted miscibility with the SA phases of the pure components. For instance, the system 40 • 4/8 CBP exhibits three separate SA phase areas. The maximum transition temperatures of the induced smectic phases increase with increasing chain length of the azomethines, but remain constant in case of the SA and SB phases or even decrease in case of the SE phases with increasing chain length of the cyanobiphenyls

Simple model of induced smectic phases in binary mixtures of liquid crystals

1986 ◽  
Vol 84 (11) ◽  
pp. 6410-6420 ◽  
Author(s):  
Wim H. de Jeu ◽  
Lech Longa ◽  
Dietrich Demus
Keyword(s):  
Liquid Crystals ◽  
Simple Model ◽  
Binary Mixtures ◽  
Smectic Phases ◽  
Induced Smectic Phases

Induced smectic phases. - Densities of binary mixtures of 4,4'-dialkylazoxybenzenes with 4-pentyl-4'-cyanobiphenyl (PCB)

1982 ◽  
Vol 43 (11) ◽  
pp. 1673-1678 ◽  
Author(s):  
K.W. Sadowska ◽  
A. Zywociński ◽  
J. Stecki ◽  
R. Dabrowski
Keyword(s):  
Binary Mixtures ◽  
Smectic Phases ◽  
Induced Smectic Phases

Zustandsdiagramme und röntgenographische Untersuchungen einiger induzierter smektischer Mischphasen / Phase Diagrams and X -R ay Studies of the Induced Smectic Phases of Liquid Crystal Mixtures

1978 ◽  
Vol 33 (9) ◽  
pp. 1077-1084 ◽  
Author(s):  
B. Engelen ◽  
F. Schneider
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Phase Diagrams ◽  
Layer Thickness ◽  
Polar Liquid ◽  
X Ray ◽  
Polar Components ◽  
Smectic Phases ◽  
Induced Smectic Phases

Phase diagrams of mixtures of terminal polar and terminal non-polar liquid crystals that exhibit smectic phases with very large ranges of stability are presented. X-ray studies show that the in­duced phases are of type SA, SB or SE. The determination of the layer thickness shows that the induced smectic phases are composed of monolayers, whereas the terminal polar components are composed of bilayers. A model for the formation of the induced smectic phases is proposed.

Induktion smektischer Phasen in binären Mischungen nematischer Flüssigkristalle / Induction of Smectic Phases in Binary Mixtures of Nematic Liquid Crystals

1978 ◽  
Vol 33 (2) ◽  
pp. 185-189 ◽  
Author(s):  
G. Heppke ◽  
E.-J. Richter
Keyword(s):  
Thermal Stability ◽  
Phase Diagram ◽  
Liquid Crystals ◽  
Binary Mixtures ◽  
Nematic Liquid Crystals ◽  
Smectic Phase ◽  
Smectic Phases ◽  
Thermal Stability Of ◽  
Induced Smectic Phases

Binary mixtures of 4-n-alkyl- and 4-w-alkyloxy-4′-cyanobiphenyls with homologous 4,4′-di-n-alkyloxy-azoxybenzenes exhibit the induction of a smectic phase. From some of the phase diagram it can be concluded that the induced smectic phases (ISP) are of the SA type, and this is probably true for all mixtures studied. The thermal stability of the induced smectic phases can not be correlated with the clearing temperatures of the single components, but a dependence on their ability to form smectic phases is very likely. It is postulated that mixtures of terminal polar and terminal non polar nematic liquid crystals are generally able to exhibit the induction of smectic phases.

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