Questions tagged [liquid-crystal]
Liquid crystals (LCs) are matter in a state that has properties between those of conventional liquid and those of solid crystal.
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How to call ellipse packing structures?
My research group and I are trying to figure out what is the correct terminology for two different packing structures of 2D ellipses. The two structures are displayed below as Structure A and ...
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Why my optical limiting behavior is Descending? (on input intensity- output intensitydiagram)
I measure some nonlinear optical materials and I know that output intensity respect to input intensity should be ascending like this diagram. but for me, for one of my materials, this diagram is ...
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What's the difference between Equivalence and Degeneracy?
I'm in a middle of an advanced stat-mech course, and we are now learning about liquid crystals (LC). In the last tutorial, we developed the Landau Free Energy of the LC system near the
transition ...
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Non-linear corrections to the Oseen-Frank free energy density
A nematic liquid crystal is essentially a fluid of long, rod-like molecules whose average orientation is dictated by a vector field $\mathbf {\hat {n}} $. The so-called Frank-Oseen (free) energy (...
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Transition from nematic phase to smectic phase in calamitic liquid crystals
I am a math student and not very good at physics. I am so confused when I read the paper about the mathematical problems in liquid crystals.
My question is about the nematic phase and smectic phases. ...
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Persistence length by De Gennes: how to make sense of the definitional equation?
I want to understand how De Gennes comes up with the concept of persistence length in microemulsions, and in particular a convenient equation that relates this persistence length to the thickness of ...
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Why do LCD pixels at the very edges of the screen "disappear" when looking at a shallow angle?
I've noticed something curious about my LCD screens (one of them is a TUF VG32VQ1B and the other an AOC I2269VW, if it makes a difference):
If I look at them at a shallow angle, any bright line of ...
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Help to identify physics behind Valve patent on "variable optical correction using spatially varying polarizers"
Apparently, there is a way to vary optical power by employing spatially varying polarizers. The patent is almost unreadable. My understanding is that they propose to stack spatially varying polarizers ...
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Do acoustic waves in liquid crystals have transverse modes?
According to a previous question:
Modes of propagation in media
acoustic waves in media can be decomposed in two kinds of modes: longitudinal and transverse; solids being the only one where they are ...
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Order parameter
Order parameter:
Suppose, for simplicity, that the molecules composing a
nematic or cholesteric liquid crystal are rigid and rodlike
in shape. Then we can introduce a unit vector v") along
the ...
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How does this red liquid crystal display (LCD) work?
This Casio G-3110 has a passive display showing red when two black layers of what appears to be ordinary LCD overlap. How does this work? When tilted as in this photo the black layers do not fully ...
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Deforming a nematic line defect to a uniform configuration
In Nakahara section 4.9, "Defects in nematic liquid crystals", it is discussed that the order parameter for a nematic should be the real projective plane $\mathbb{R}P^2$, which has ...
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Bond Orientational Correlation Function
Firs this question has some similarity with Bond order correlation function and Bond Orientational Correlation Function - how exactly to calculate but its a little bit different , so having those ...
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Thermal hysteresis and its physical significance in lipid membranes?
We usually associate the phenomenon of hysteresis with memory in the system. For example, magnetic hysteresis is the basis of hard disks(if I recall it correctly). There are also electronic circuits(...
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Liquid crystals resource recommendation
I'm going to work with liquid crystals during my summer internship and I am so woefully unprepared. Could you please recommend me some book or some review articles that cover the essential concepts ...