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9 Cards in this Set
- Front
- Back
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Molecular Dispersions
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(molecules, ions) in gas, liquid
“Particles” are < 1 nm, diffuse easily and form homogeneous phases (i.e., true solutions) |
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Colloidal Dispersions
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micelles, microemulsions, some suspensions (e.g. colloidal
silver), “polymers”, & foams Particles range in size from 1 to 500 nm, diffuse very slowly, and are separated by ultrafiltration |
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Coarse Dispersions
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most pharmaceutical suspensions and emulsions, dust, powder,
cells, sands Particles are >500 nm, do not diffuse, and are separated by filtration |
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Lyophilic
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Solvent-loving, interact with the dispersion medium
– Easily form colloidal dispersions – Examples: gelatin, insulin, albumin, rubber, polystyrene |
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Lyophobic
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Solvent-hating, little or no interaction with the dispersion
medium – Require special steps to create dispersion – Examples: gold, silver, sulfur, silver iodide |
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Amphiphilic
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Concentration dependent colloid formation
– Examples: surfactants |
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Which dispersed phase has large organic molecules
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Lyophilic Phase
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Which dispered phase has ingorganic particles
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Lyophobic Phase
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Which phase has aggregates of smaller particles or ions
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Association Phase
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