One of the basic properties of micelles is the ability to solubilize various compounds. You could try some simple experiment: prepare the "micelles or particles" in the presence of some,say, fluorophore or whatever is easily detected, them thoroughly wash the particles so that merely adsorbed compound is eliminated, and then analyze them. Is the probe is still there in significant quantity - this is a good sign of a micelle.

Also, micelles should have CMC - a concentration below which they are not formed, and the copolymer is merely soluble. Probably you could try DLS vs concentration, but check some related paper first - probably, in the case of polymeric surfactants the CMC is too low.

Another approach could be to analyze the dynamic behavior of the macromolecular chains, for example, by NMR relaxation. If you compare the relaxation times (or diffusion coefficients) of the suspected micelle core in "micelle or particle" state, in the solution, and in bulk (or in definitely dense particles) - and the diffusion in the case of the "what's this" particles is somewhat in between the solution and the bulk closer to solution - this is also a good sign. However, the latter experiment seems too complicated to me, and no quarantee to have a definite answer then.

One of the basic properties of micelles is the ability to solubilize various compounds. You could try some simple experiment: prepare the "micelles or particles" in the presence of some,say, fluorophore or whatever is easily detected, them thoroughly wash the particles so that merely adsorbed compound is eliminated, and then analyze them. Is the probe is still there in significant quantity - this is a good sign of a micelle.

Also, micelles should have CMC - a concentration below which they are not formed, and the copolymer is merely soluble. Probably you could try DLS vs concentration, but check some related paper first - probably, in the case of polymeric surfactants the CMC is too low.

Another approach could be to analyze the dynamic behavior of the macromolecular chains, for example, by NMR relaxation. If you compare the relaxation times (or diffusion coefficients) of the suspected micelle core in "micelle or particle" state, in the solution, and in bulk (or in definitely dense particles) - and the diffusion in the case of the "what's this" particles is somewhat in between the solution and the bulk closer to solution - this is also a good sign. However, the latter experiment seems too complicated to me, and no quarantee to have a definite answer then.

may be with NMR, because the micelles seem to have the cubic phase.

Nmr

TEM is a nice way to see whether the samples are solid particles or micelles.