Binding of polynucleotides with single-walled carbon nanotubes: Effect of temperature
| Autor: | Victor A. Karachevtsev, M.V. Karachevtsev, V.S. Leontiev, O. S. Lytvyn, Vladimir A. Valeev, G. O. Gladchenko |
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| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Nanotube Absorption spectroscopy Precipitation (chemistry) Mechanical Engineering chemistry.chemical_element Polymer Carbon nanotube Condensed Matter Physics law.invention Adsorption Ultraviolet visible spectroscopy chemistry Chemical engineering Mechanics of Materials law Polymer chemistry General Materials Science Carbon |
| Zdroj: | Materialwissenschaft und Werkstofftechnik. 42:92-97 |
| ISSN: | 0933-5137 |
| DOI: | 10.1002/mawe.201100738 |
| Popis: | The effect of the change of the temperature (in the range from 20°C to 90°C) on the light absorption intensity of water suspensions of nanohybrids formed with single-walled carbon nanotubes (SWNT) and single-stranded polyriboadenylic acids, poly(rA), and polyribocytidylic acids, poly(rC), was studied. Different degrees of the polymer coating of nanotube surfaces were found by atomic force microscopy (AFM). According to UV-vis absorption spectroscopy data, homopolymer adsorption onto the nanotube is followed with changes in optical characteristics of both, the polymer and SWNT, as a result of ππ-stacking interaction of the polymer with the tube surface. Upon poly(rA) wrapping on the nanotubes, a significant part of its bases keeps self-stacking while upon adsorption of the more rigid poly(rC), it is almost completely disordered. Spectroscopic data can be explained by a polymer re-orientation on the nanotube with the heating that provides the optimal ππ-stacking of nitrogen bases with the carbon surface. The increase of the temperature up to 90°C does not result in the polymer slipping off the nanotube and in a noticeable nanotube precipitation. |
| Databáze: | OpenAIRE |
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