Relationship between the SWCNT concentration after sonication-centrifugation (determined from absorbance data in Figure 2 and Beer’s law from Figure 3) and the as-prepared concentration of the dispersions in NMP (solid curve) and the IPA (dashed curve). The 60 μg/mL dispersion was prepared by sonicating for 20 minutes and the subsequent dilutions from the 60 μg/mL dispersion were sonicated for 30 seconds each to homogenize. The dispersions were centrifuged after every successive dilution.