ChemInform Abstract: First- and Second-Order Smectic-A to Nematic Phase Transitions in p,p′-Dialkylazoxybenzenes Studied by Birefringence

ChemInform ◽  
1989 ◽  
Vol 20 (5) ◽  
Author(s):  
E. F. GRAMSBERGEN ◽  
W. H. DE JEU
Keyword(s):  
Phase Transitions ◽  
Nematic Phase ◽  
Second Order ◽  
Smectic A

scholarly journals INFLUENCE OF PRESSURE ON SMECTIC A-NEMATIC PHASE TRANSITION

1999 ◽  
Vol 13 (09n10) ◽  
pp. 275-283 ◽  
Author(s):  
KISOR MUKHOPADHYAY ◽  
PRABIR K. MUKHERJEE
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Phenomenological Model ◽  
Order Parameter ◽  
Nematic Phase ◽  
Tricritical Point ◽  
Second Order ◽  
Experimental Results ◽  
First Order ◽  
Smectic A

We propose a Landau-de Gennes phenomenological model to describe the pressure induced smectic A-nematic phase transition. The influence of pressure on smectic A-nematic phase transitions are discussed for varying coupling between orientational and translational order parameter with pressure. Increasing the pressure, the first order nematic-smectic A transition becomes second order at a tricritical point which agrees fairly well with available experimental results.

Weighted-Density Theory of Phase Transitions in Fluids Composed of Anisotropic Particles

1989 ◽  
Vol 177 ◽  
Author(s):  
J. F. Marko ◽  
W. A. Curtin
Keyword(s):  
Phase Transitions ◽  
Nematic Phase ◽  
Density Functional ◽  
Sum Rules ◽  
Liquid Structure ◽  
Order Theory ◽  
Second Order ◽  
Anisotropic Particles ◽  
Key Factor ◽  
Derivatives Of

ABSTRACTA nonperturbative approach to the density-functional description of phase transitions in fluids composed of anisotropic particles is presented. The theory is exact to second order in functional perturbation theory, and at higher orders satisfies all sum rules derived from density derivatives of the two-point direct correlations. We have applied this theory to orientational and translational freezing of hard ellipsoids, and we find that the description of the structure of crystalline phases is improved in comparison to the commonly used second-order theory. For the case of orientational freezing, it is found that the higher-order contributions do not modify the predictions of the second-order theory, and that accurate liquid structure appears to be the key factor leading to improved description of the nematic phase.

scholarly journals Symmetry changes and dipole orderings in the smectic A to C phase transitions of second order

1977 ◽  
Vol 38 (8) ◽  
pp. 961-970 ◽  
Author(s):  
A. Michelson ◽  
D. Cabib ◽  
L. Benguigui
Keyword(s):  
Phase Transitions ◽  
Second Order ◽  
Smectic A
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