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. Author manuscript; available in PMC: 2010 Oct 1.
Published in final edited form as: Biomaterials. 2009 Aug 20;30(31):6351–6357. doi: 10.1016/j.biomaterials.2009.08.009

Figure 2.

Figure 2

Bioavailable nickel and yttrium in SWNT samples. a, b: Metal catalyst nanoparticles visible by TEM. Scale bar: 100 nm. Arrows point to catalytic particles. The total metal mass percentages by digestion and ICP-ES are 23.3% nickel and 5.77% yttrium for SWNT A, and 6.7% nickel and 1.3 % yttrium for SWNT B. c,d: Results of quantitative dose-dependent metal mobilization (bioavailability) assays. Figures give total soluble Ni and Y concentrations after SWNT samples were sonicated in CES buffer for 2 hours at pH 7.2 followed by centrifugal ultrafiltration and ICP analysis of the filtrate. These were the same conditions used for electrophysiological characterization. Error bars represent standard deviation from triplicate determination.