| 单词 |
permselective |
| 释义 |
permselective, a. Chem.|pɜːmsɪˈlɛktɪv|
[f. permeable a. + selective a.]
Of an ion-exchange membrane: permeable to anions but not to cations, or vice versa; more generally, selectively permeable to certain molecules or ions. Hence ˌpermselecˈtivity.
1953A. G. Winger et al. in Jrnl. Electrochem. Soc. C. 178/2 For the purpose of this paper, an ideal permselective membrane will be defined to be a membrane which, when subjected to a potential gradient, permits passage of cations to the exclusion of anions, or vice versa. Ibid. 179/1 In any electrolytic process ion concentrations are appreciable and perfect permselectivity is an idealized situation of little practical interest. 1962S. B. Tuwiner Diffusion & Membrane Technol. ix. 177 The most important factor which affects permselectivity for a given membrane is the concentration of the electrolyte. 1968Encycl. Polymer Sci. & Technol. VIII. 636 The ability of an ion-exchange membrane to discriminate between ions of different sign is called its permselectivity. 1969W. R. R. Park Plastics Film Technol. viii. 197 A process which may come to have the universal utility of distillation is the use of permselective membranes for the separation of mixtures of liquids or gases. 1971A. F. Stancell in Tobolsky & Mark Polymer Sci. & Materials xii. 263 The preferred permeation of one molecule through a polymer with respect to other diffusing molecules is termed membrane permselectivity. |
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