scholarly journals Optical Textural Study of Surface Phase Transitions Involving Tilted Hexatic Phases in Free-Standing Liquid-Crystal Films

2004 ◽  
Vol 412 (1) ◽  
pp. 401-408
Author(s):  
Chih-Yu Chao ◽  
Tung-Cheng Pan ◽  
John Ho
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Surface Phase ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Surface Phase Transitions ◽  
Crystal Films

Hexatic and crystal phase transitions in thin free-standing liquid-crystal films

1991 ◽  
Vol 66 (10) ◽  
pp. 1322-1325 ◽  
Author(s):  
R. Geer ◽  
T. Stoebe ◽  
C. C. Huang ◽  
R. Pindak ◽  
G. Srajer ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Crystal Phase ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Crystal Films

INFLUENCE OF DIMENSIONALITY AND SURFACE ORDERING ON PHASE TRANSITIONS: STUDIES OF FREELY-SUSPENDED LIQUID-CRYSTAL FILMS

1994 ◽  
Vol 08 (22) ◽  
pp. 3051-3082 ◽  
Author(s):  
CHRISTIAN BAHR
Keyword(s):  
Phase Transitions ◽  
Liquid Crystal ◽  
Two Dimensions ◽  
Smectic Liquid Crystals ◽  
Liquid Crystal Films ◽  
Integral Number ◽  
Smectic Phases ◽  
Crystal Films ◽  
Freely Suspended ◽  
Freely Suspended Films

Freely-suspended films of smectic liquid crystals can be regarded as membranes consisting of a stack of an integral number of molecular (smectic) layers with the layer planes being parallel to the two free surfaces. Because of their variable thickness (between thousands and only two layers) and the large variety of phase transitions between different smectic phases, freely-suspended films are excellent systems to study the influence of the dimensional cross-over from three to two dimensions on phase transitions. Further, because the free surface of a liquid crystal has a strong ordering effect (contrary to solids which exhibit generally surface-induced disorder), freely-suspended films are well-suited for the study of the effect of enhanced surface order on phase transitions. A review of the corresponding experimental work is given.

PHYSICAL PROPERTIES OF THIN SUBSTRATE-FREE LIQUID-CRYSTAL FILMS

1995 ◽  
Vol 09 (18n19) ◽  
pp. 2285-2319 ◽  
Author(s):  
T. STOEBE ◽  
C.C. HUANG
Keyword(s):  
Liquid Crystal ◽  
Two Dimensions ◽  
Calorimetric Data ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Ideal System ◽  
Crystal Films ◽  
Optical And Mechanical Properties ◽  
Molecular Layers ◽  
Physical Phenomena

Free-standing liquid-crystal films constitute a unique and phenomenally rich system in which a number of physical phenomena may be carefully studied. In particular, they provide an ideal system in which the novel theories of defect-mediated melting in two-dimensions (2D) may be tested. Calorimetric data is presented that indicate that such theories cannot adequately account for phase transitions in effectively 2D free-standing liquid-crystal films only two molecular layers in thickness. Extensive Monte Carlo simulation studies have therefore been performed on a trial Hamiltonian that couples herringbone order to the hexatic order. In a relatively large region of parameter space, the simulation yields heat-capacity consistent with our calorimetric data. These results are discussed in the context of existing data on the structural, optical, and mechanical properties of free-standing films.

Surface tension of free-standing liquid-crystal films

1994 ◽  
Vol 49 (5) ◽  
pp. R3587-R3590 ◽  
Author(s):  
T. Stoebe ◽  
P. Mach ◽  
C. C. Huang
Keyword(s):  
Surface Tension ◽  
Liquid Crystal ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Crystal Films
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