SEM image of silk-CNT composite. SEM images of PLO, silk, and silk-CNT substrates before cell seeding (A, B, C, respectively) and after incubating with hESCs for 7 days (D, E, F, respectively). On the silk-CNT surface, there were some micro silk-CNT aggregates distributed within silk matrices (C). After 7 days, the silk-CNT substrate became porous. Some neuronal axons were found to extend into those concaves on the substrate (F). Scale bar, 20 μm.
Chen et al. Nanoscale Research Letters 2012 7:126 doi:10.1186/1556-276X-7-126