Effect of free surfaces on the smectic-A–hexatic-B–crystal-Etransitions in thin free-standing films of the liquid-crystal compoundn-heptyl-4’-n-pentyloxybiphenyl-4-carboxylate (75OBC)

1993 ◽  
Vol 48 (1) ◽  
pp. 408-427 ◽  
Author(s):  
R. Geer ◽  
T. Stoebe ◽  
C. C. Huang
Keyword(s):  
Liquid Crystal ◽  
Free Standing ◽  
Free Surfaces ◽  
Smectic A

CHARACTERIZATION SEVERAL NOVEL PHASE TRANSITIONS IN A UNIQUE LOWER DIMENSION SYSTEM OF FREE-STANDING LIQUID-CRYSTAL FILMS

1996 ◽  
Vol 10 (07) ◽  
pp. 269-277 ◽  
Author(s):  
A.J. JIN ◽  
M. VEUM ◽  
C.F. CHOU ◽  
J.T. HO ◽  
V. SURENDRANATH ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Wetting Transition ◽  
Layer By Layer ◽  
Free Standing ◽  
Crystal Sample ◽  
Liquid Crystal Films ◽  
Smectic A ◽  
Phase Sequence ◽  
Crystal Films ◽  
Clearing Temperature

Motivated by the defect-mediated two-stage melting theory, extensive experiments have been concluded on free-standing films of a liquid-crystal sample which exhibits the isotropic-smectic-A–hexatic B-crystal-B bulk phase sequence. For a two-layer film, which is virtually two-dimensional, our calorimetric measurement shows an apparently divergent anomaly near the smectic-A-hexatic-B transition. Its anomaly has a dominant fluctuation contribution and can be fitted to a power law with an exponent α≈0.37±0.05, in disagreement with the theoretical prediction. Thicker films exhibit surface-initiated layer-by-layer (LBL) wetting transition upon cooling. Moreover, these films also exhibit interesting LBL thinning transitions above the bulk clearing temperature.

Layer thinning transition above the bulk smectic-A–isotropic transitionin free-standing liquid-crystal films

1997 ◽  
Vol 55 (4) ◽  
pp. 4386-4389 ◽  
Author(s):  
P. M. Johnson ◽  
P. Mach ◽  
E. D. Wedell ◽  
F. Lintgen ◽  
M. Neubert ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Smectic A ◽  
Crystal Films
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