Biomedical Engineering Reference
In-Depth Information
Figure 10.19
Cell viability over time determined via MTT assay. Cell
viability after exposure to MWCNT (a), and SWCNT (b) at
four concentrations (5, 10, 25, and 50 lg/mL) and four time
points (12, 24, 48, and 72 h) [49].
After a 24 h exposure, cells exposed to MWCNT produced up
to threefold higher increase in reactive oxygen species than those
exposed to SWCNT. In their study, they suggest that high-aspect
ratio carbon material toxicity is dependent on dimension and
composition.
Surface of the carbon can be improved by HA layer deposition
(Fig. 10.20, Fig. 10.21) from electrolyte consisting calcium nitrate,
ammonium phosphate, and ammonium hydroxide [19].
Figure 10.20
SEM image of hydroxyapatite (HA) deposited onto the carbon
ibers [19].
