Heat capacity measurements of extremely thin substrate-free liquid-crystal films

1994 ◽  
Vol 15 (6) ◽  
pp. 1189-1197 ◽  
Author(s):  
T. Stoebe ◽  
J. T. Ho ◽  
C. C. Huang
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Heat Capacity Measurements

Thermal Property Evolution Toward Effectively Two-Dimensional Substrate-Free Systems

1989 ◽  
Vol 177 ◽  
Author(s):  
R. Geer ◽  
T. Stoebe ◽  
C. C. Huang ◽  
R. Pindak ◽  
J. Goodby
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Adiabatic Calorimeter ◽  
Two Dimensional ◽  
Limiting Behavior ◽  
Liquid Crystal Films ◽  
Smectic A ◽  
Surface Transition ◽  
Crystal Films ◽  
Molecular Layers

ABSTRACTA high-resolution differential quasi-adiabatic calorimeter has been developed to investigate the physical properties of freestanding liquid-crystal films. Our recent heat-capacity studies near the smectic-A-hexatic-B transition of both 65OBC and 46OBC freestanding films clearly demonstrate the evolution towards twodimensional limiting behavior in four-layer films. As the film thickness decreases towards four molecular layers, the heatcapacity anomalies first display separate peaks for the surface and interior transitions and then evolve to one dominated by the surface transition.

Unusual Thickness-Dependent Heat-Capacity Anomalies in Free-Standing Hexatic Liquid-Crystal Films

2002 ◽  
Vol 88 (8) ◽  
Author(s):  
C. Y. Chao ◽  
C. R. Lo ◽  
P. J. Wu ◽  
T. C. Pan ◽  
M. Veum ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Crystal Films

Heat-Capacity Study of Free-Standing Liquid-Crystal Films

1986 ◽  
Vol 57 (10) ◽  
pp. 1239-1242 ◽  
Author(s):  
T. Pitchford ◽  
C. C. Huang ◽  
R. Pindak ◽  
J. W. Goodby
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Crystal Films

Heat-capacity anomaly from four-layer liquid-crystal films

1989 ◽  
Vol 63 (5) ◽  
pp. 540-543 ◽  
Author(s):  
R. Geer ◽  
C. C. Huang ◽  
R. Pindak ◽  
J. W. Goodby
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Heat Capacity Anomaly

Unusual Thickness-Dependent Heat-Capacity Anomaly in Free-Standing Hexatic Liquid-Crystal Films

2004 ◽  
Vol 412 (1) ◽  
pp. 385-392
Author(s):  
C. Y. Chao ◽  
T.C. Pan ◽  
C. R. Lo ◽  
M. Veum ◽  
C. C. Huang ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Heat Capacity Anomaly

Heat-capacity anomalies from four-layer liquid-crystal films: Experimental results and simulation results

1993 ◽  
Vol 47 (4) ◽  
pp. 2938-2941 ◽  
Author(s):  
C. C. Huang ◽  
I. M. Jiang ◽  
A. J. Jin ◽  
T. Stoebe ◽  
R. Geer ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Experimental Results ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Simulation Results

An ac calorimeter for measuring heat capacity of free‐standing liquid‐crystal films

1991 ◽  
Vol 62 (2) ◽  
pp. 415-421 ◽  
Author(s):  
R. Geer ◽  
T. Stoebe ◽  
T. Pitchford ◽  
C. C. Huang
Keyword(s):  
Heat Capacity ◽  
Liquid Crystal ◽  
Free Standing ◽  
Liquid Crystal Films ◽  
Crystal Films

Attractive mode force microscopy of chiral liquid crystal surfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 268-269
Author(s):  
B.D. Terris ◽  
R. J. Twieg ◽  
C. Nguyen ◽  
G. Sigaud ◽  
H. T. Nguyen
Keyword(s):  
Liquid Crystal ◽  
Crystal Surfaces ◽  
Free Surfaces ◽  
Control Range ◽  
Force Microscopy ◽  
Liquid Crystal Films ◽  
Chiral Liquid Crystal ◽  
Crystal Films ◽  
Electrostatic Charging ◽  
And Shifts

We have used a force microscope in the attractive, or noncontact, mode to image a variety of surfaces. In this mode, the microscope tip is oscillated near its resonant frequency and shifts in this frequency due to changes in the surface-tip force gradient are detected. We have used this technique in a variety of applications to polymers, including electrostatic charging, phase separation of ionomer surfaces, and crazing of glassy films.Most recently, we have applied the force microscope to imaging the free surfaces of chiral liquid crystal films. The compounds used (Table 1) have been chosen for their polymorphic variety of fluid mesophases, all of which exist within the temperature control range of our force microscope.

Dynamics of tilted hexatic phases in liquid-crystal films

1991 ◽  
Vol 1 (11) ◽  
pp. 1363-1373 ◽  
Author(s):  
Jonathan V. Selinger
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Crystal Films
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