| 释义 |
lyophobic, a. Physical Chem.|laɪəˈfəʊbɪk|
[f. lyophobe a. + -ic.]
Of a dispersed colloidal phase: not having an affinity for the dispersion medium; readily precipitated out by small quantities of electrolyte. Also applied to sols containing such a phase, which generally have a similar surface tension and viscosity to those of the dispersion medium, and which on evaporation or cooling give solids which cannot readily be reconverted into sols.
1911H. Freundlich in Chem. News 22 Sept. 140/1 Colloidal solutions stand between these two extremes. One class, distinguished from coarse suspensions only by the ultramicroscopic dimensions of their particles, are termed ‘Suspension-colloids’ or ‘Lyophobic Sols’. These include colloidal metals, sulphides, and many hydroxides. ‘Emulsion-colloids’, or ‘Lyophilic sols’, which include albumin, gelatin, starch, &c., approach more nearly to the true solutions. 1959K. J. Musels Introd. Colloid Chem. viii. 181 If we consider a paraffinic solvent,..the alcohol group is now lyophobic and the hydrocarbons are lyophilic. 1968Physics Bull. Nov. 377/1 The stability of lyophobic colloids, like a quartz suspension or gold sol, is due to the competition between electrostatic forces of repulsion..and the van der Waals attraction. |