Effect of Functionalized Carbon Nanotubes and their Citric Acid Polymerization on Mesenchymal Stem Cells In Vitro

Figure 2

Representative SEM micrographs of (a, b) fMWNT, (c, d) PMWNT, (e, f) fCNxs, and (g, h) PCNxs. Black arrows in (b) show the functionalized edge of the CNT, while the arrows in (f, h) indicate the typical bamboo-like structure of the CNx. Arrows also indicate the thin PCA film on the surface of the (d) MWNT and the (h) CNx. The EDS spectra of the four samples are included (i); the quantitative data for C, Fe, N, and O is provided in Table 1, with a faint silicon signal arising from the substrate.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)