Biomedical Engineering Reference
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Fig. 12 CNTs act as a vector for drug delivery into living cells. After incubation of HeLa cells
with AlexaFluor594-labeled SWNTs for 12 h at 37 C, living cells were observed under confocal
fluorescence microscope for a CNT uptake study. (a) Images show dual confocal detection of
AlexaFluor594-SWNT ( red ) internalized into cells with the membrane stained by AlexaFluor488
( green ). (b) Series of images of different z -focal scanning planes down through cells. (Adapted
from [ 61 ])
Another method for the synthesis of stable metal nanoparticles involves first
mixing the metal hydrosols and an ethanol solution of dodecylamine and then
extracting the dodecylamine-stabilized metal nanoparticles into toluene. The etha-
nol, a water miscible and good solvent for dodecylamine, was used as an interme-
diate solvent to improve the interfacial contact between citrate-stabilized metal
nanoparticles and alkylamine. The extraction of dodecylamine-stabilized metal
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