Flavin analogues are dispersants of carbon nanotubes. We report the finding that riboflavin, which is a nutrient that is much less expensive than a flavin mononucleotide, is a good SWNT dispersant in water. We carried out a temperature dependence test of the solubilization of SWNTs, and propose a possible solubilization mechanism based on a regression analysis. We assume that the linear and lognormal components for the solubilized SWNTs can be explained by nonspecific and specific interactions between the riboflavin and the SWNTs, respectively. We also carried out computational calculations (molecular dynamics simulations) on this SWNT solubilization by which we proposed a suitable complex structure of the SWNT that provided the number of adsorbed flavin molecules via hydrogen bonding on the tubes.
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