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(A, B) Adsorption isotherms of dexamethasone (Dex) onto ND-COOH (A) and ND-ODA (B), fit to Langmuir and Freundlich isotherm models. The chemical structure of Dex is shown as an inset in A. (C) FTIR spectra showing the successful carboxylation of ND (ND-COOH), ODA attachment to ND (ND-ODA), and adsorption of Dex onto ND-ODA (ND-ODA-Dex). (D) Particle size distribution of ND-ODA and ND-ODA-Dex after being bath sonicated for 1 min and filtered using a 10 μm cell strainer.
