How to identify Critical Micelles Concentration (CMC) shape ? Which instrument ? any other techniques ?

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David Scheuing

If you mean micelle shape changes - FT-IR can be a nice complement to scattering techniques. See ACS Symposium Series #447, FT-IR in Colloid and Interface Science, Chapter 6 "Micellar Sphere to Rod Transitions"

Paul F Luckham

scattering is the best way to be honest. If they are rod shaped micelles the viscosity would be higher so that could give a clue, but to be sure you would still need some scattering experiments.

Yuri Mirgorod

Prakash Karunanithi

You are confusing the determination of the concentration at which micelles begin to appear and the determination of the shape of the micelles. The picture shows the shapes of micelles. The best methods for determining the shape of micelles are small-angle X-ray scattering or small-angle neutron scattering.