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9 Cards in this Set

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