Fig. 2
From: HA-coated collagen nanofibers for urethral regeneration via in situ polarization of M2 macrophages
Surface biophysical characteristics. A Representative TEM micrographs of HA-collagen nanofiber. Red arrows indicate HA-coated collagen nanofiber. B ATR-FTIR spectra examination the surface of collagen, HA-collagen nanofibrous films and HA. C Histogram of the water contact angle data measured with the different nanofiber samples. Left panels are water contact angle photographs of the different nanofibrous films taken in the perpendicular and parallel directions to the fiber axis with a video microscope. n = 5, **p < 0.01. D High-resolution AFM surface morphology of collagen and HA-collagen nanofibrous films