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Colloidal Behavior of Fullerenes (nC60): Role of Coions
Citation:
Mukherjee, B. AND J. W. WEAVER. Colloidal Behavior of Fullerenes (nC60): Role of Coions. Presented at 239th ACS National Meeting & Exposition, San Francisco, CA, March 21 - 25, 2010.
Impact/Purpose:
Scientific meeting presentation.
Description:
Effects of coions on the average initial aggregate size (DH) and zeta potential (ZP) of nC60 in mono and divalent counterion (10 mM) systems were investigated at pH 3, 5.8, and 10. Differences in the effects of SO42-and Cl- could not be established, in presence of Na+, for all pH treatments. The same was true at pH 3 and 5.8 when Mg2+ was present. However, a strong coion-dependent surface charge reversal occurred at pH 10. ZP and DH were measured at +4 mV and 1450 nm for SO42- and +40 mV and 225 nm for Cl- treatments. In contrast, ZP and DH for nC60 in DI water were -65 mV and 115 nm, respectively at pH 10. These findings provide a better understanding of the interaction characteristics of colloidal nC60 with coions and may allow us to better assess the behavior of nC60 in aquatic environments.