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This anisotropic liquid is known as a liquid crystalline or mesomorphous state. Using DSC, it is possible to observe the small energy changes that occur as matter transitions from a solid to a liquid crystal and from a liquid crystal to an isotropic liquid.
4-Cyano-4'-pentylbiphenyl is a commonly used nematic liquid crystal with the chemical formula C 18 H 19 N. It frequently goes by the common name 5CB. 5CB was first synthesized by George William Gray, Ken Harrison, and J.A. Nash at the University of Hull in 1972 and at the time it was the first member of the cyanobiphenyls.
Liquid crystals possess the mechanical properties of a liquid, but have the optical properties of a single crystal. Temperature changes can affect the colour of a liquid crystal, which makes them useful for temperature measurement. The resolution of liquid crystal sensors is in the 0.1 °C (0.2 °F) range.
The columnar phase is a class of mesophases in which molecules assemble into cylindrical structures to act as mesogens.Originally, these kinds of liquid crystals were called discotic liquid crystals or bowlic liquid crystals [1] because the columnar structures are composed of flat-shaped discotic or bowl-shaped molecules stacked one-dimensionally.
Liquid crystals used in dyes and inks often come microencapsulated, in the form of suspension. Liquid crystals are used in applications where the color change has to be accurately defined. They find applications in thermometers for room, refrigerator, aquarium, and medical use, and in indicators of level of propane in tanks.
7. Fatty Foods. An occasional bite of a hot dog or other fatty human foods won’t kill your dog (provided, of course, that it isn’t toxic). Ideally, however, you shouldn’t feed dogs foods ...