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Topic: Liquid crystal

Related Topics

Columnar phase

First order phase transition

Crystal

Phase (matter)

Liquid crystal display

Crystal structure

Phase transition

Thermochromics

Liquid crystal display

Chirality (chemistry)

Differential scanning calorimeter

Crystal optics

Biaxial nematic

Anisotropic

Nonlinear optics

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	Howstuffworks "How LCDs Work"
		This means that liquid crystals are neither a solid nor a liquid.
		It turns out that liquid crystals are closer to a liquid state than a solid.
		This explains why liquid crystals are very sensitive to temperature and why they are used to make thermometers and mood rings.
	www.howstuffworks.com /lcd.htm (456 words)

	Liquid crystal cells, elements and systems patents new
		The display panel comprises a liquid crystal display element and a retro-reflector disposed at the bottom of the liquid crystal display element such that an incident ray of light incident upon the retro-reflector is...
		20070139592 - Liquid crystal display: A liquid crystal display able to deal with high definition display and able to secure both of a transmission type display luminance and a reflection type display luminance, wherein light from backlights 71a and 71b are focused by a lens sheet 74, luminance of the backlights is improved, a transmittance...
		Agent: Fish & Richardson P.C. Liquid crystal display device: It is an object of the present invention to apply a sufficient electrical field to a liquid crystal material in a horizontal electrical field liquid crystal display device typified by an FFS type.
	www.freshpatents.com /Liquid-crystal-cells-elements-and-systems-dtnewntc349.php (5000 words)

	How it Works : Liquid Crystals (Site not responding. Last check: )
		Liquid crystal materials, materials which though liquid exhibit some of the properties of solid crystal, were a chemical novelty when they were first discovered in about 1889 by H Reinitzer, an Austrian botanist.
		Liquid crystal displays have a disadvantage for some applications in that they cannot be seen in the dark without a power consuming ancillary light source.
		Liquid crystal displays are to be found in portable equipment where they offer a digital readout device consuming only about one thousandth of the power of other common forms of display such as gas discharge or LED light emitting diode) semiconductor.
	www.triquartz.co.uk /lcd.html (1554 words)

	LCD
		Once their existence was confirmed, liquid crystals began to attract many other scientists around the turn of the century, keen to solve the mystery of their curious properties.
		In a normal liquid, molecules are randomly arranged; but the molecules of a warmed liquid crystal retain some of their original orderliness - just enough order for the liquid crystal to retain the optical properties of a solid.
		The phospholipids at this pressure retain enough liquid crystal structure at the ambient temperature to provide a strong cell membrane capable of withstanding the strain.But when the bacterium is brought to the surface, the pressure drop changes the critical temperature at which the liquid crystal cell walls can maintain their structure.
	www.geocities.com /Omegaman_UK/lcd.html (2753 words)

	Nikon MicroscopyU Movie Gallery: Liquid Crystals
		Liquid crystals are sometimes referred to as the "fourth state" of matter following gases, liquids, and solids.
		However, the molecular forces maintaining the liquid crystal state are sufficiently weak that it can be maintained only over a limited range of temperatures and pressures.
		Although it displays characteristics of both a crystal and a liquid, the liquid crystal state also has properties that are unique.
	www.microscopyu.com /moviegallery/chemicalcrystals/liquidcrystal/index.html (187 words)

	Liquid Crystals
		Liquid crystals are composed of moderate size organic molecules which tend to be elongated and shaped like a cigar, although we have studied, and the literature is full of variety of other, highly exotic shapes as well.
		liquid crystal devices (e.g., the "twisted nematic" cell), because the average orientation may be manipulated with an electric field, and the polarization of light will follow the molecular orientation as it changes through a cell.
		Antiferroelectric liquid crystals are similar to ferroelectric liquid crystals, although the molecules tilt in an opposite sense in alternating layers.
	liq-xtal.cwru.edu /lcdemo.htm (864 words)

	Liquid Crystal Supplier
		A liquid crystal is an organic compound whose properties appear to be fluid and crystalline simultaneously.
		Liquid crystals behave in unique ways because their several distinct optical properties exhibit interesting changes when subjected to thermal, electric, and magnetic fields.
		Liquid crystal colors can change through the visible color spectrum with a temperature change of only two degrees C. Through formulation, the temperature range can be expanded and the starting point of the range can be changed.
	www.presschem.com /liquid-crystals.htm (263 words)

	Liquid Crystal Displays Materials
		As light propagates through the liquid crystal cell, it is broken up into two modes which are generally elliptically polarized with the major axis of the polarization ellipse parallel to the nematic director (See Basics of LCD Operation).
		Liquid crystals are long chain organic molecules that sometime exhibit the properties of a liquid, yet have the long range ordering of a solid.
		Liquid crystals differ in that the value of most of its physical parameter are dependent on the direction along which they are measured relative to the molecule itself.
	www.liquidcrystaltechnologies.com /LCDMaterials.htm (2644 words)

	Self-aligning liquid crystal technique could simplify manufacture of display devices
		Liquid crystals are a key component of the displays used in most laptop computers and the increasingly-popular flat panel televisions.
		Controlled by a network of transistors, the liquid crystals change their optical characteristics in response to electrical signals to create the text and images we see.
		Instead, they use the in-situ photopolymerization of alkyl acrylate monomers in the presence of nematic liquid crystals to provide a cellular matrix of liquid crystalline droplets in which the chemical structure of the encapsulating polymer controls the liquid crystal alignment.
	www.eurekalert.org /pub_releases/2006-09/giot-slc092106.php (746 words)

	Liquid Crystal
		Liquid crystal is a fourth ``state'' that certain kinds of matter can enter into under the right conditions.
		In cholesteryl myristate, the latent heat for changing from a solid to the liquid crystal state is 65 calories per gram, whereas the latent heat for the liquid crystal to liquid transition is only 7 calories per gram.
		Liquid crystal behaves differently depending on what direction electric or magnetic fields are applied relative to the director.
	web.media.mit.edu /~stefan/liquid-crystals/node2.html (1321 words)

	Glossary
		In liquid crystals, this is due to the alignment and the shape of the molecules.
		Polymer liquid crystals in which the mesogenic cores are a part of the main chain or backbone of the polymer.
		A polymer liquid crystal in which the mesogens are attached to the side of the main chain and not a part of the main chain itself.
	plc.cwru.edu /tutorial/enhanced/files/glossary/glossary.htm (5322 words)

	Liquid Crystal Images
		Nucleation of the domains is favored by the surface orientation of the molecules that prefer to be parallel to the liquid crystal surface.
		A liquid crystal is a phase between solid and liquid states (phases).
		Liquid Crystals are intermediate phases between crystalline solids and isotropic liquids.
	www.lci.kent.edu /lcimages.html (588 words)

	Introduction to Liquid Crystals
		Liquid crystal materials are unique in their properties and uses.
		The characteristic orientational order of the liquid crystal state is between the traditional solid and liquid phases and this is the origin of the term mesogenic state, used synonymously with liquid crystal state.
		The anisotropic nature of liquid crystals is responsible for the unique optical properties exploited by scientists and engineers in a variety of applications.
	plc.cwru.edu /tutorial/enhanced/files/lc/Intro.htm (688 words)

	Liquid Crystal Sheets (Site not responding. Last check: )
		Liquid crystals are an intermediate state of matter or mesophase between (crystalline) solid and liquid.
		Although in a liquid phase, the shape of the molecule and intermolecular forces means that the molecules retain a common preferred orientation.
		Light incident onto the surface of a chiral nematic liquid crystal will ordinarily be transmitted, but in the special case where the wavelength of the light equals the pitch of the molecules, the waves are reflected and interfere constructively.
	www.fas.harvard.edu /~scdiroff/lds/CondensedMatter/LiquidCrystalSheets/LiquidCrystalSheets.html (413 words)

	Liquid Crystals
		Eventually he realized that the cloudy liquid was a new state of matter and coined the name "liquid crystal," illustrating that it was something between a liquid and a solid, sharing important properties of both.
		Liquid crystals are partly ordered materials, somewhere between their solid and liquid phases.
		The nematic phase is the simplest of liquid crystal phases and is close to the liquid phase.
	nobelprize.org /educational_games/physics/liquid_crystals/history (1379 words)

	An SXGA reflective liquid crystal projection light valve incorporating inversion by pixel bootstrapping
		The electro-optical effect in twisted nematic liquid crystal displays responds to the rms value of the voltage across the liquid crystal layer, which in active-matrix displays is approximately the voltage between the pixel electrode and the common counter electrode.
		The new SXGA light valves were assembled with 54-degree twisted nematic liquid crystal [7, 8] and operated in normal and bootstrapped modes, with frame and row-pair inversion, at frame rates up to 108 Hz.
		The luminance vs. peak liquid crystal voltage (relative to the center voltage) curve was measured under the polarizing microscope for the cases of normal and bootstrapped frame inversion.
	www.research.ibm.com /journal/rd/446/schlig.html (4454 words)

	Liquid crystal IDs pathogens TRN 082504
		When biomolecules present in liquid flowing past the detector bind to the detector's phospholipid molecules, the liquid crystal becomes brighter, and shows a pattern corresponding to the orientation of the molecules.
		Because liquid crystal exists in both the biological and electronic worlds, it seemed natural to use the substance to create an interface between the two worlds, he said.
		The liquid crystal molecules, which are shaped like rods, bind with the phospholipids in such a way that the liquid crystal molecules line up vertically, which makes the liquid crystal dark under polarized light.
	www.trnmag.com /Stories/2004/082504/Liquid_crystal_IDs_pathogens_082504.html (530 words)

	liquidcrystal
		Liquid crystal thermometers portray temperatures as colors and can be used to follow temperature changes caused by heat flow.
		Liquid crystals can be adjusted by the manufacturer to change colors over different temperature ranges, but 30 °C to 35 °C seems to be a common range.
		The molecules in the liquid crystal thermometer are made of cholesterol, and are called cholesteric liquid crystals.
	www.exo.net /~pauld/activities/liquidcrystal/liquidcrystal.html (1733 words)

	Liquid Crystal (Site not responding. Last check: )
		Liquid crystal displays (LCDs) are now so common that we take it for granted that people know what we are talking about when we use the phrase.
		Crystals, such as quartz, are formed when molecules form a three-dimensional matrix by attaching themselves firmly to each other in a regular pattern in which they all point in exactly the same direction.
		The term "liquid crystal" is used to describe a substance which is in a state between a liquid and a crystal but exhibits properties similar to both.
	www.meko.co.uk /liquidcrystal.shtml (413 words)

	ASTC - Resource Center - Exhibits - Liquid Crystal Wall
		As the heat expands and twists the molecules in the liquid crystal film, the wavelengths of light they reflect change from red through orange, yellow, green, and blue.
		The second is that the liquid crystal sheets only come on 12-inch-wide rolls, so if you want one that is four feet wide, you have to seam four sheets together.
		To do this, we had to attach several sheets of liquid crystal film together in seams, and then had to have the front surface of the whole piece laminated with a thin matte finish to keep the pieces from being pried apart.
	www.astc.org /resource/exhibits/stein.htm (988 words)

	Liquid Crystal Materials
		Liquid crystals may be nematic, smectic or cholesteric, depending on the arrangement of the molecules they are also birefringent, meaning that it possesses two different indices of refraction.
		The molecular director in bulk ferroelectric liquid crystals adopts a helical structure, Noel Clark and Sven Lagerwall found in 1980 that by confining the ferroelectric liquid crystals material between closely-spaced glass plates (spaced closer than the ferroelectric helix pitch), the natural helix could be suppressed.
		The liquid crystal molecules have a permanent electric dipole perpendicular to the long axis of the molecule (the director).
	www.kth.se /fakulteter/TFY/kmf/lcd/lcd~1.htm (7707 words)

	Liquid Crystal Display -- LCD's
		The liquid crystal twists the polarization of light entering one filter to allow it to pass through the other.
		If the liquid crystals are completely untwisted, light passing through them will be polarized perpendicular to the second filter, and thus be completely blocked.
		By controlling the twist of the liquid crystals in each pixel, light can be allowed to pass though in varying amounts, correspondingly illuminating the pixel.
	www.edinformatics.com /inventions_inventors/lcd.htm (1321 words)

	Taylor & Francis Journals: Welcome
		Liquid Crystals publishes accounts of original research concerned with all aspects of liquid crystal science and technology, including experimental and theoretical studies ranging from molecular design and synthesis to applications engineering.
		The journal focus is on liquid crystalline supermolecular organization and self-assembly in a wide range of materials, including thermotropic, lyotropic, interfacial, chiral, ferroelectric, polymer, micro/nanocomposite, biological and related soft-matter liquid crystal systems.
		Liquid Crystals provides the scientific community, in both academia and industry, with a publication of standing, guaranteed by the Editors and by the International Editorial Board who are active scientists in the worldwide liquid crystal community.
	www.tandf.co.uk /journals/titles/02678292.asp (265 words)

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