Figure 1
From: Dispersion of single-walled carbon nanotubes modified with poly-l-tyrosine in water
Dispersion of SWCNTs in distilled water. (a) Dispersion of SWCNTs in distilled water 14 days after the preparation. Left: SWCNTs without any surface modification. SWCNTs coagulated to each other and finally sedimented. Right: SWCNTs modified with pLT. pLT/SWCNT complexes remained stably dispersed for at least 14 days. (b) ζ potentials of SWCNTs in DW, SWCNTs in TritonX-100 solution, dsDNA/SWCNT complexes in DW, and pLT/SWCNT complexes in DW. The ζ potentials were measured 14 days after the preparation. The ζ potential of pLT/SWCNT complexes in DW is slightly lower than that of dsDNA/SWCNT complexes in DW, but higher than that of SWCNTs in TritonX-100 solution. (c) Time variations of the turbidity of SWCNTs in DW, SWCNTs in TritonX-100 solution, dsDNA/SWCNT complexes in DW, and pLT/SWCNT complexes in DW. The turbidity of SWCNTs in TritonX-100 solution, dsDNA/SWCNT complexes in DW, and pLT/SWCNT complexes in DW hardly changed for 14 days, whereas SWCNTs without any surface modification sedimented quickly. The turbidity of pLT/SWCNT complexes in DW was slightly lower than that of dsDNA/SWCNT complexes in DW, but higher than that of SWCNTs in TritonX-100 solution.