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Colloids and Thixotropic Fluids

Colloids and Thixotropic Fluids - Colloids(particle size...

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Gas Liquid Solid NONE Liquid Aerosol Solid aerosol Gas (All gases are mutually miscible) Examples: fog, mist Examples: smoke, air particulates Foam Emulsion Sol Liquid Examples: whipped cream Examples: mayonnaise, hand cream Examples: milk, paint, pigmented ink Solid Foam Gel Solid Sol Solid Examples: aerogel, styrofoam, pumice Examples: butter, gelatin, jelly, cheese, opal Examples: cranberry glass, ruby glass Continuous media Dispersed Medium Colloids (particle size: 1-1000 nm) Detection : Tyndall effect (light scattering) (Note: scattering is weak if particles are small relative to wavelength of light -- visible light is 350-800 nm)
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Representation of two colloidal particles Destruction of stable colloidal suspension: Coagulation Heating or addition of strong electrolyte can cause coagulation. Example : Soil deposition at river delta occurs when muddy fresh water hits salt water.
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Cottrell * precipitator installed in a smokestack. Frederick G. Cottrell applied for a patent on a device for charging particles and then
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