Figure 1
(a) Measured adsorption isotherm (black dots) and Langmuir fit (black line) of PAE on 2.5 wt% HiPco material with 5 wt% SWCNT content at pH 7. Single point measurements of PAE adsorption on Arc Discharge and HiPco with 90 wt% and 80 wt% SWCNT content, respectively (blue & red dots). Single point measurement of Pluronic F68 and F108 adsorption on HiPco with 5 wt% SWCNT content are also shown (green & orange dots). (b) Absorbance spectra of dispersed SWCNT content separated from raw dispersions of 0.5 wt% HiPco powder in aqueous 2 wt% of various polymeric dispersants. (c) Surface tension measurements of aqueous PAE solutions and determination of the critical micelle concentration (CMC) at 23 °C. Inset: picture showing the colloidal stability of HiPco material with 5 wt% SWCNT content at increased PAE Concentration. (d) Chromatographic analysis of PAE. In black, the elution of PAE polymer as measured with asymmetrical-field field flow fractionation with differential refractive index detector. In blue the corresponding molecular weight determined with a multi angle light scattering detector.
