Science Fair Project Encyclopedia
Sol (colloid)
Sols are lyophobic (solvent hating) suspensions of solid particles (1 to 1000 nanometres in size) in a liquid. They may be prepared by dispersion or condensation. Dispersion techniques include grinding the solids to colloidal dimensions in a ball mill (dry/wet) and Beidig's arc method. Condensation or precipitation methods work by making the colloidal particle come out of solution into the colloidal phase, either by addition of a precipitating agent (salt) or by change of temperature. Stability of the sols prepared may be maintained by using dispersing agents
Last updated: 05-07-2005 20:09:04
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details