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Crystal powder is obtained by grinding crystals, resulting in powder particles, made up of one or more crystallites. Both polycrystals and crystal powder consist of many crystallites with varying orientation. Crystal phases are defined as regions with the same crystal structure, irrespective of orientation or twinning. Single and twinned ...
The Crystallography Open Database (COD) is a database of crystal structures. [1] Unlike similar crystallographic databases, the database is entirely open-access, with registered users able to contribute published and unpublished structures of small molecules and small to medium-sized unit cell crystals to the database.
Liquid crystal color transitions are used on many aquarium and pool thermometers as well as on thermometers for infants or baths. [84] Other liquid crystal materials change color when stretched or stressed. Thus, liquid crystal sheets are often used in industry to look for hot spots, map heat flow, measure stress distribution patterns, and so on.
Cholesteric liquid crystals (ChLCs), also known as chiral nematic liquid crystals, are a supramolecular assembly and a subclass of liquid crystal characterized by their chirality. Contrary to achiral liquid crystals, the common orientational direction of ChLCs (known as the director) is arranged in a helix whose axis of rotation is ...
Reflective Liquid Crystal Displays, by Shin-Tson Wu, Deng-Ke Yang, Wiley, 2001, Chapter 6 and Google Books. Liquid Crystals In Complex Geometries: Formed by Polymer And Porous Networks, edited by G P Crawford, S Zumer, CRC Press, 1996. Conducting polymer substrates for plastic liquid crystal displays. Magic Sky Control Using SPD-SmartGlass ...
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Liquid crystal polymers (LCPs) are polymers with the property of liquid crystal, usually containing aromatic rings as mesogens. Despite uncrosslinked LCPs, polymeric materials like liquid crystal elastomers (LCEs) [ 1 ] and liquid crystal networks (LCNs) can exhibit liquid crystallinity as well.
Liquid crystals with low molecular weight can be mixed with high molecular weight polymers, followed by phase-separation to form a kind of spongy matrix filled with LC droplets. An external electric field can align the LC to match its index with that of the polymer matrix, switching that cell from a milky (scattering) state to a clear ...