title: G-quadruplex guanosine gels and single walled carbon nanotubes.
abstract: Solubilization of single walled carbon nanotubes (SWNTs) in aqueous gel phases formed by reversible, G-quadruplex self-assembly of guanosine monophosphate (GMP) alone or with guanosine (Guo) is described. Unlike other media and methods for aqueous solubilization of SWNTs, the guanosine gels ("G-gels") are found to readily disperse high (>mg/mL) concentrations of individual rather than bundled SWNTs. SWNT dispersions in GMP alone precipitate in several hours and re-form upon shaking; however, dispersions in the binary GMP/Guo gels are indefinitely stable. Increasing GMP or KCl concentration in the binary gels increased the relative abundance of large diameter and semi-conducting SWNTs. Different gel compositions also displayed different selectivities toward SWNTs of different chiralities. These results indicate a strong connection between the self-assembled G-gels and the dimensions and structures of the SWNTs that they solubilize.
authors: Yuehua
authors: Y
authors: Yu
authors: Victor L
authors: VL
authors: Pushparaj
authors: Omkaram
authors: O
authors: Nalamasu
authors: Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY 12180, USA. mcgowl@rpi.edu.
authors: Linda B
authors: LB
authors: McGown
mesh_terms: D054856:G-Quadruplexes; D005782:Gels / Q000737:chemistry*; D006151:Guanosine / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012995:Solubility; D019265:Spectroscopy, Near-Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D005782:Gels; D037742:Nanotubes, Carbon; D006151:Guanosine