| 释义 |
nematic, a. Physical Chem.|nɛˈmætɪk|
[ad. F. nématique (G. Friedel 1922, in Ann. de Physique XVIII. 227), f. Gr. νῆµα, νήµατ- thread: see -ic.]
Applied to (the state of) a mesophase in which the molecules all have the same orientation but are not arranged in well-defined planes (as they are in a smectic phase). Also as n., a nematic substance.
1923Chem. Abstr. XVII. 3267 A complete treatise upon the types and properties of matter existent between the true amorphous and cryst. states. The condition formerly designated as liquid crystals or anisotropic liquids is divided into 2 classifications: smectic.., and nematic. 1940S. Glasstone Text-bk. Physical Chem. vii. 505 Nematic liquids are closer to true anisotropic liquids than are the smectic phases. 1971Physics Bull. June 357/2 One of Marconi's exhibits at this year's Physics Exhibition demonstrated the effective use of organic nematic liquid crystals for visual display purposes. 1972Sci. Amer. Mar. 39/1 (Advt.), We hereby announce the commercial availability of a multicomponent nematic that might suffice to call off some chemists. 1974Nature 25 Jan. 178/3 Nuclear magnetic resonance spectra of molecules oriented in themotropic and lyotropic nematics. |