| 单词 | liquid crystal |
| 释义 | > as lemmasliquid crystal liquid crystal n. [translating German flüssiger krystall (O. Lehmann 1890, in Ann. d. Physik u. Chem. XL. 404)] Physical Chemistry a turbid liquid that exhibits double refraction (indicative of internal anisotropy and hence some degree of ordering in its structure, as in an ordinary crystal) and exists as a distinct state of certain pure substances between the melting point and some higher temperature, at which it becomes an ordinary liquid. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystal types > [noun] negative crystal1831 plastic crystal1877 liquid crystal1891 cholesteric1965 mesomorph1969 1891 Jrnl. Chem. Soc. 60 i. 250 Liquid crystals, when heated between cover glasses slightly above the point where they pass into ordinary liquids, retain on cooling the original direction of their optical axes. 1938 Ann. Reg. 1937 352 Tobacco mosaic virus is a nucleoprotein of special character, existing as mesomorphic fibres in the cell sap and spontaneously forming liquid crystals of gigantic cell-size when isolated. 1962 Times 30 Apr. 7/1 When detergents are mixed with a limited amount of water, several distinct ‘mesomorphic’ phases may be formed. These phases are also known as ‘liquid crystals’ because some of their properties are akin to those of a solid while others are characteristic of a liquid. 1972 Physics Bull. May 279/1 These fascinating compounds can no longer be regarded as freaks of nature, for out of every two hundred organic compounds at least one may be a liquid crystal. < as lemmas |
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