Figure 3

Physicochemical characterization of the PLGA, GO-PLGA, PLGA-Col, and GO-PLGA-Col matrices. (A) FT-IR spectra were recorded in absorption mode in the wavelength range of 1000–2200 cm⁻¹ with a resolution of 4.0 cm⁻¹ and 16-times scanning. (B) XRD patterns of GO, PLGA, GO-PLGA, PLGA-Col, and GO-PLGA-Col matrices were collected with Cu-K_α radiation (λ = 0.154 nm) at 40 kV and 30 mA. (C) Contact angles of the matrices were measured by the sessile drop method.