Sols


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Sols

 

extremely disperse colloidal systems with a liquid dispersion medium. Traditionally sols are sometimes called colloidal solutions. The particles of the dispersed phase, micelles, participate independently of one another in vigorous Brownian movement and therefore do not precipitate under the influence of gravity. Their dimensions usually do not exceed 10-10−10-7 cm. Sols with an aqueous dispersion medium are called hydrosols; those with an organic medium are called organosols.

A distinction is made between lyophilic and lyophobic sols. Lyophilic sols form spontaneously and do not break down with time. Lyophobic sols, on the other hand, break down gradually because of spontaneous coagulation or coalescence of the particles, although if the system contains a stabilizer, the process can be very slow. Hydrosols of soaps and soaplike surface-active substances, as well as hydrosols and organosols of certain organic pigments and dyes, are lyophilic sols; synthetic latices and hydrosols and organosols of metals are typical lyophobic sols. When the liquid dispersion medium solidifies without separation of a new phase— that is, in vitrification—so-called solid sols form, in which motion of particles with respect to one another is impossible; ruby glass is an example. Systems of minute solid or liquid particles uniformly distributed in a gaseous medium (air) are called aerosols. [9–666–l]

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The use of sols with increasing concentration will lead to an increased thickness of the coatings and simultaneously an increased occurrence of bridging of nearby fibres resulting in a lower flexibility of the treated fabric.
Khartoum, 22,Juil (SUNA)- Professeur Ahmed Mostafa Siddiq Hayati directeur de l'Universite de Khartoum s'est dirige a Rome pour participer aux reunions de l'atelier technique sur le sol au cours de la periode du 22 Juillet au 26 Juillet au siege actuel de l'Oganisation modiale pour l'alimentation et l'agriculture modiale (FAO ) dans la capitale italienne ,Rome.
George Allen (R-Va.) had drawn up plays for SOLs. Our hard-won flags hung limp in the school library, but I was still trying to focus on kids, not scores.
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The food at Sol Meyer was excellent, but one consistent knock was that landing a table could prove challenging.
And last year Mandy decided to set up the Sol Curry Charitable Trust charity.