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(a) Water contact angle of different ACS14 concentration coatings (n = 5, ***p < 0.001). (b) SEM images of ACS14 coatings at different concentrations. (c) XPS full spectrum of drug-loaded coatings prepared with different concentrations of ACS14, and (d) high-resolution spectra of the S element content. (e) Drug release of the drug-loaded coatings in PBS at pH 6.5. (f) Drug release curve of drug-loaded coating in PBS at pH 7.4.
