Temperature-dependent aggregation structures of fullerene-based ionomers in electrolyte solutions

摘要

We have synthesized fullerene derivatives, C-60[CO(CH2)(5)O (CH2)(4)SO3Na](6) (FC10S). which consists of a C-60 cage covalently bonded with six sulfonated arms for a high water solubility. We study the aggregation structures of the novel C60-derivatives in 0.1 M NaCl aqueous solutions by small angle X-ray scattering (SAXS). In the concentration range studied, 0.5 wt% to 2 wt%, the rod-like structure of FC10S aggregates has a radius of 20 Angstrom and a rod-length about 150 Angstrom at 25 degreesC, and the aggregation structure is insensitive to the concentration change. The aggregates, however, grow in length as the temperature increases, while the radius increases slightly with increasing temperature. [References: 20]