NDFS 250 Dispersed systems

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  1. characteristics of substances dispersed in water affect the nature of the mixture
    • molecular size
    • polarity
    • electrostatic potential
  2. stability, or maintenance of a homogenous mixed aqueous dispersion depends on what?
    • miscibility: the ability of the substance to disperse in water
    • solubility: the degree to which a miscible substance remains homogeneously dispersed over time
  3. three states of liquid dispersions
    • true solutions - very stable
    • colloidal dispersions - moderate to good stability
    • suspensions - poor stability
  4. true solution?
    • ion or tiny molecules (<1nm)
    • invisible under any microscope
    • pass through most membranes
    • very stable
    • transparent
    • usually cannot form gels
  5. colloidal dispersion
    • macromolecules or small groups of molecules 1-100nm
    • visible under electron microcsope
    • pass through filters but not through membranes
    • moderately stable
    • translucent (semi-transparent)
    • form gels
  6. Suspensions?
    • large groups of molecules
    • visible under light microscope
    • don't pass through filters
    • unstable; settle out
    • opaque (cloudy, not transparent or translucent)
    • cannot form gels
  7. what would be true solution?
    • salts
    • vitamins
    • sugars
  8. what would be colloidal dispersion?
    • fats (if homogenized)
    • proteins
    • pectin
    • cellulose
    • cooked starch
    • gums
  9. what would be suspension?
    uncooked startch
  10. internal phasse? external phase? 
    discontinuous phase

Card Set Information

Author:
dorothyayaya
ID:
218828
Filename:
NDFS 250 Dispersed systems
Updated:
2013-05-10 01:25:23
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NDFS 250
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NDFS 250
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