| 释义 |
ˈsmectic, a. (and n.)
[ad. L. smēcticus (Pliny), ad. Gr. σµηκτικός, f. σµήχειν to wipe, cleanse; cf. smegma.]
1. Cleansing, abstersive, detergent. rare.
1675Evelyn Terra (1676) 40 Smooth to the touch, as the most Smectic Earths and Marles themselves. 1686Plot Staffordsh. 124 The Smectic and Figuline Earths. 1858Mayne Expos. Lex., Smecticus, cleaning;..smectic.
2. Physical Chem. Applied to (the state of) a mesophase (a liquid crystal) in which the molecules all have the same orientation and are arranged in well-defined planes. Also as n., a smectic substance. Cf. nematic a. [ad. F. smectique (G. Friedel 1922, in Ann. de Physique XVIII. 276).]
1923[see nematic a.]. 1936Mineral. Abstr. VI. 237 In addition to the fuller's earths and smectic clays the series includes montmorillonite, confolensite, [etc.]. 1940Glasstone Text-bk. Physical Chem. vii. 505 In the smectic state normal liquid flow does not occur: the movement is of a gliding nature, in one plane. 1971New Scientist 14 Jan. 63/2 Once the smectic mesophase had formed, the continuous or ‘closed’ bimolecular sheets would isolate the aqueous compartments from their neighbours. 1974Nature 25 Jan. 178/3 As yet uncategorised smectics probably exist, for example, the smectic phase of 4′-n-octyl-4-cyanobiphenyl described by Gray. |