Fig. 5

Characterization of PCNU scaffolds by scanning electron microscopy and biaxial tensile testing. A Representative scanning electron microscopy image of PCNU fibres in an electrospun biomaterial sheet (scale bar = 20 μm). Three separate regions of the electrospun sheet were isolated for scanning electron microscopy imaging and subsequent quantification of fibre diameter and orientation, and biaxial mechanical properties (N = 3). B Electrospun PCNU fibres were 447 ± 56.7 nm (mean ± SD) in diameter and C followed a principal direction of alignment, that conferred D anisotropic tensile properties to the PCNU scaffolds with greater compliance in the cross-fibre direction than the fibre direction