Structural disjoining pressure in thin film of liquid crystals I.: Thermodynamics and Frederiksz transition with surface fields

1978 ◽  
Vol 256 (8) ◽  
pp. 784-792 ◽  
Author(s):  
E. Perez ◽  
J. E. Proust ◽  
L. Ter-Minassian-Saraga
Keyword(s):  
Thin Film ◽  
Liquid Crystals ◽  
Disjoining Pressure ◽  
Structural Disjoining Pressure ◽  
Surface Fields

Structural disjoining pressure in thin films of liquid crystals

1977 ◽  
Vol 255 (11) ◽  
pp. 1133-1135 ◽  
Author(s):  
E. Manev ◽  
J. E. Proust ◽  
L. Ter-Minassian-Saraga
Keyword(s):  
Thin Films ◽  
Liquid Crystals ◽  
Disjoining Pressure ◽  
Structural Disjoining Pressure

Repulsion Phenomena in Thin Layers of Alcoholic Solutions of Tetrabutylammonium Iodide

1980 ◽  
Vol 35 (8) ◽  
pp. 869-875 ◽  
Author(s):  
G. Peschel ◽  
P. Belouschek
Keyword(s):  
Boundary Layer ◽  
Methyl Alcohol ◽  
Butyl Alcohol ◽  
Disjoining Pressure ◽  
Thin Layers ◽  
Methyl Ethyl ◽  
Tetrabutylammonium Iodide ◽  
Structural Disjoining Pressure ◽  
Chain Lengths

AbstractThe structural disjoining pressure of methyl-, ethyl-, n-propyl, and n-butyl alcohol was deter-mined in thin layers between highly smooth rutile surfaces when tetrabutylammonium iodide was added. The a verage thickness of the oriented solvation layers per interface turned out to be largest for methyl alcohol (about 1.5 nm) and decreases like the disjoining pressure when passing to the related alcohols with longer chain lengths. Tetrabutylammonium iodide clearly reduces the thickness of the boundary layer with increasing concentration.

Wetting and Spreading of Nanofluids on Solid Surfaces Driven by the Structural Disjoining Pressure: Statics Analysis and Experiments

Langmuir ◽  
2011 ◽  
Vol 27 (7) ◽  
pp. 3324-3335 ◽  
Author(s):  
Kirti Kondiparty ◽  
Alex Nikolov ◽  
Stanley Wu ◽  
Darsh Wasan
Keyword(s):  
Disjoining Pressure ◽  
Solid Surfaces ◽  
Structural Disjoining Pressure

45.3: Pentacene Organic Thin-Film Transistor Integrated with Color Twisted Nematic Liquid Crystals Display (CTNLCD)

2004 ◽  
Vol 35 (1) ◽  
pp. 1298 ◽  
Author(s):  
Jia-Chong Ho ◽  
Liang-Ying Huang ◽  
Tarng-Shiang Hu ◽  
Cheng-Chung Hsieh ◽  
Wen-Kuei Hwang ◽  
...  
Keyword(s):  
Thin Film ◽  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Thin Film Transistor ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor ◽  
Twisted Nematic

Lubricant Flow and Evaporation Model for Heat Assisted Magnetic Recording Systems Including Reactive End-Group Effects and Thin-Film Viscosity

2012 ◽  
Author(s):  
Joanna E. Bechtel ◽  
David B. Bogy
Keyword(s):  
Thin Film ◽  
Film Thickness ◽  
Magnetic Recording ◽  
Disjoining Pressure ◽  
Thickness Dependence ◽  
Heat Assisted Magnetic Recording ◽  
Lubricant Flow ◽  
Simulation Results ◽  
Thin Film Viscosity ◽  
Film Viscosity

The lubricant applied to the disk in a hard drive is a critical component for head-disk interface reliability. In Heat Assisted Magnetic Recording (HAMR), the heat supplied to the disk by the laser will add new thermal considerations to lubricant performance. Investigations into how the lubricant behaves at the small time and length scales seen in HAMR systems need to be conducted numerically. Published works on HAMR lubricant modeling have considered only the van der Waals contribution to disjoining pressure, commonly called the dispersive component, and do not consider the film thickness dependence of viscosity. However, lubricants with reactive end groups such as Fomblin Zdol are widely used, and such simple disjoining pressure and viscosity models do not capture certain lubricant behavior. We have developed a simulation tool that incorporates film thickness dependencies of viscosity and polar and dispersive disjoining pressure into a continuum lubrication model. We investigate the effect of initial thickness on lubricant flow and evaporation under HAMR write conditions considering both components of disjoining pressure and thin-film viscosity. Simulation results indicate the effect of including polar disjoining pressure depends on the initial lubricant thickness. The inclusion of viscosity thickness dependence does not affect simulation results under scanning laser conditions but will be important in reflow simulations.

Rectilinear low-frequency shear of homogeneously aligned nematic liquid crystals

1993 ◽  
Vol 441 (1913) ◽  
pp. 559-573 ◽  
Keyword(s):  
Thin Film ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Theoretical Analysis ◽  
Low Frequency ◽  
The Other ◽  
Critical Amplitude ◽  
Linear Shear ◽  
Theoretical Results ◽  
Good Agreement

A thin film of nematic liquid crystal (ZLI 1085) is sandwiched between two horizontally mounted glass blocks, whose faces have been treated to align the molecules of the liquid parallel to the plane of the blocks. By moving one block relative to the other in its own plane, the liquid crystal is subjected to an oscillatory linear shear. Above a certain frequency-dependent amplitude, mechanical Williams domains of alternating bright and dark stripes are observed perpendicular to the direction of shear. A theoretical analysis of this phenomenon is carried out to provide predictions for both the thickness of the stripes and the critical amplitude as a function of frequency. Good agreement is found between the experimental and theoretical results.

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