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Characterization of micelle microenvironment by Reichardt’s dye (RD). a) UV–vis absorption spectra of RD in blank micelles (polymer/RD ratios of 2.5/1, 5/1, 10/1, 20/1, 40/1, and 80/1) and drug-loaded micelles (polymer/dye/drug ratios of 10/0.5/0, 10/0.5/1, 10/0.5/2, and 10/0.5/4). b) Wavelength and intensity of RD obtained from UV–vis absorption spectra.
