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ChapterTwelveColloidalSystemandSurfacePhenomena
Chapter Twelve Colloidal System and Surface Phenomena 12-1 Colloidal Dispersions 12-2 Formation of Colloidal Particles 12-3 Properties of Colloidal Dispersions 12-4 Surface Tension 12-1 Colloidal Dispersions the average diameter of particle 1nm 1~100nm 100nm Solution Colloidal suspension Hydrophilic Hydrophobic Colloids Colloids (very large molecules) (mass molecules) Types of Colloidal Systems Table 12-2: Colloidal dispersions dispersed dispersing type examples phase medium name gas liquid foam 泡沫 beer froth, soap suds gas solid solid foam Polyurethane (聚氨酯) foam liquid gas liquid aerosol fog, clouds liquid liquid emulsion mayonnaise(蛋黄酱), milk liquid solid solid emulsion cheese solid gas solid aerosol smokes, dust solid liquid sol most paints, starch dispersed in water, solid solid solid sol many alloys, black diamonds, ruby glass (gold in glass) 12-2 Formation of Colloidal Particles Dispersion methods: in which large pieces of the substance are broken up into particles of colloidal size. Condensation methods: in which molecules or ions or atoms are made to cluster together to form particles of the desired size. Dispersion Method of Forming Colloids Condensation Method of Forming Colloids Molecules or ions or atoms are made to cluster together to form particles of the desired size. Example: the formation of fog and clouds by the clustering together of water mol
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