The entropy change during micellization I was reviewing the thermodynamics of micelle formation from the Wikipedia page and this book. I understood most of the arguments but micellization is supposed to be an entropy driven process with a positive entropy change in the process of micellization. But isn't this a bit counter-intuitive?  


  In the unassociated form, the surfactant molecules are free to roam
  about in the solution much like normal solutes. But in the form of a
  micelle, they get associated, grouped into an associated whole, which
  reduces the freedom of independent movement and should therefore
  decrease the entropy (randomness) of the system? The entropy change
  should be negative during micellization. Why is it positive?  


I understood the mathematical arguments leading to the develpment of the approximate formula $\Delta G=RT\ln(\text{CMC})$.
The micellization releases water molecules which initially solvate the hydrophilic head groups. The release of these waters greatly increases the entropy.

Reference: Dong et al., Chem. Rev. 2010, 110, 4978-5022.