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Charge on colloidal particles

  1. Mar 7, 2012 #1
    IS there charge on all colloidal partciles? My book states that charge is the reason why colloidal partciles are stable, otherwise they would coagulate
    I always thought that it was their size that made them float.
    I dont understand how they attain charge - they are not like ionic compounds such that they would get charge
    For example :- metals sols like gold sols are negatively charged , blood is positvely charged
    I dont get it. Where does this charge come from??
    IS it necessary for colloids to have charge?
  2. jcsd
  3. Mar 7, 2012 #2


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