Dear Anwarul Azim Akib, the following paper deals with the use of DLS in CMC determination. My Regards

https://doi.org/10.1016/j.molliq.2012.10.013

Hello Anwarul Azim Akib

there are also two application notes for the Zetasizer which explain how light scattering may be of use with finding the CMC critical micelle concentration:

• Example surfactants (Triton, Tween, Nonidet) critical micelle concentrations https://www.malvernpanalytical.com/en/learn/knowledge-center/application-notes/AN101104SurfactantMicelleCharacterization.html
• Example triblock colpolymer critical micellization temperature https://www.malvernpanalytical.com/en/learn/knowledge-center/application-notes/AN180518SurfactantMicelleTemperatureMADLS.html

CMC is a static (thermodynamics) property. DLS probes dynamics. So for sure it it not the most appropriates techniques. Static light scattering should be more convenient. The point is to measure the amount of copolymers which are still free in solution (unimers). Their concentration is the CMC. Depending on the corresponding sizes of micelles and unimers, it should be possible in principle to fit data with a bimodale population, allowing to access the quantity of interest.

Hello, some systems from Cordouan Technologies are allowing to analyze your data and compute the CMC.