To explore the effect of different surfactants on PPcy aggregation, we used PEG45-b-PCL105, PEG114-b-PCL53, and PEG66-b-PLA43, in comparison with POEGMA60-b-PCL37, to encapsulate PPC20 aggregates in water. The results are presented in Figure . One can see that, with the same load (50% by weight) of PPC20, the dispersions stabilized with PEG114-b-PCL53 or POEGMA60-b-PCL37 remained transparent, in contrast to the obvious turbidity of the dispersions stabilized with PEG45-b-PCL105 or PEG66-b-PLA43, respectively. The dispersions remained turbid for the latter two surfactants even when the load of PPC20 decreased to 33% by weight (Figure ). Such turbidity is also reflected from the light scattering effect in the low-wavelength region of the UV-VIS-NIR absorption spectra. These results suggest the larger loading