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Homework Help: Colloidal chemistry - interpretation of lecture notes

  1. Apr 24, 2009 #1

    How do you interpret this?
  2. jcsd
  3. Apr 24, 2009 #2
    My guess is:

    • Greater than 8 surfactant molecules are required to form a functional micelle.
    • Non-ionic surfactant behaviour is affected by solution temperature.
    • Ionic surfactant behaviour is affected by electrolytes in solution.
    Last edited: Apr 24, 2009
  4. Apr 24, 2009 #3
    Seems reasonable :)
  5. Apr 24, 2009 #4


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    What it really means is that you need at least 8 carbons in your alkyl chain before you start to form stable micelles. It isn't impossible for C7 compounds to do it but http://pubs.acs.org/doi/abs/10.1021/jm00228a025" [Broken]

    The other part of your notes can be interpreted as: As you change the temperature in solutions of non-ionic surfactants you can see different behavior (different behavior = changes in CMC for example). In ionic surfactants, electrolytes can cause these changes as well (as does temperature but they are not as sensitive to temperature as the non-ionic ones).
    Last edited by a moderator: May 4, 2017
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