| 研究実績の概要 |
Fullerene attracts much interest due to its potential in optoelectronic and bio-medical applications. However, the insolubility in water or some organic solvents hinders its development. Herein, a number of different commercial polymers, Pluronic L64, 17R4, poly(ethylene glycol) (PEG), polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), and polyacrylic acid (PAA) were used to disperse fullerene in water. Through a simple ultrasonication in the presence of various polymers, fullerenes were dispersed in water. UV-Vis, DLS size, NMR, FT-IR, MALDI-TOF, and TEM were used to confirm the formation and physical/chemical properties of nanoparticles of fullerene-polymer complex. The maximum dispersibility of C60 by Pluronic L64 reached to 9.8 g/L, which was the highest ever reported. Furthermore, these complexes can be dried and redispersed in water. Moreover, strong ESR signals were detected in the aqueous dispersion and in the dried state to one months under aerobic conditions, which suggests forming of long-lived fullerene radicals. This research proposes a novel facile dispersion method of fullerene with dramatic long life-time radicals, which is expecting to be applied in the potential biological applications such as photodynamic treatment and drug delivery system.
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