# 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 $\Delta G=RT\ln(\text{CMC})$.

• Where are you quoting that part from? It doesn't seem to be quoted... – Gaurang Tandon Mar 23 '18 at 11:58