Fig. 2From: Preparation of gamma poly-glutamic acid/hydroxyapatite/collagen composite as the 3D-printing scaffold for bone tissue engineering(A) FTIR spectra of collagen, collagen/γ-PGA, collagen/γ-PGA/hydroxyapatite 3D scaffolds, and the 2D membrane. (B) Porosity of materials. (C) Surface topography of scaffolds and the membrane (D) Pore size and connector size measurement (n = 5) Back to article page