OM images of HEK 293T cells seeded on the PPy substrate covered with aligned CNF. (a) Schematic of the NFES grid-patterned CNF of different positioning densities. (b, c) Approximately 183 fibers/mm2 (20 μm), (d, e) approximately 37 fibers/mm2 (100 μm), and (f, g) cells seeded on randomly distributed CNF via conventional electrospinning. The smaller images at the right upper corner are shown to reveal the orientation of the cells (not on scale). The scale bars are 100 μm.
Fuh et al. Nanoscale Research Letters 2013 8:97 doi:10.1186/1556-276X-8-97