Synthesis and Application of Multi-functionalized Hydrophilic Carbon Nanoparticles

K. Kokubo, M. Kato, T. Noguchi, A. Harada, I. Morita, T. Oshima
Osaka University, JP

Keywords: carbon, nanoparticle, hydrophilic, fullerenol, additive

Summary:

Functionalized carbon nanoparticles as low toxic and tunable additives can be widely applicable to modify the properties of various organic materials. One of the most typical and promising nanoparticles is polyhydroxylated fullerenes, so-called fullerenols. The fullerenols have exhibited moderate to excellent hydrophilic nature, depending on the number of OH groups, with a small particle size (a molecular size) of ca. 1 nm. Some applications of fullerenols as additives have been reported for an antioxidant, a CMP polishing slurry, and the nanocomposite of common polymers.In this study, the further chemical modifications of such hydrophilic carbon nanoparticles were investigated and brought about many interesting and unique properties. Partially-chlorinated fullerenols showed amphiphilic nature, resulting in a good allergen removal rate (99.4% for 30 min) against a major Japanese cedar allergen cry-j-1 evaluated by Sandwich ELISA method. The fullerenol having methacrylate addend was synthesized and then copolymerized with methyl methacrylate monomer. The resulting fullerenol-PMMA copolymer exhibited higher thermal stability up to ca. 200 °C than pristine PMMA. We will present the synthetic methods for these multi-functionalized hydrophilic carbon nanoparticles as well as the details of their physicochemical properties.