Controlling the electrophoretic mobility of single-walled carbon nanotubes: A comparison of theory and experiment

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Research areas:
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Year: 2007
Type of Publication: Article
  • Monica L. Usrey, Daniel E. Agnew Nitish Nair
Journal: Langmuir Volume: 23
Number: 14 Pages: 7768-7776
Month: JUL 3 2007
PT: J; TC: 15; UT: WOS:000247487200056
The electrophoretic mobilities of single-walled carbon nanotubes ( SWNTs) in agarose gels subjected to negatively charged covalent functionalization and noncovalent anionic surfactant adsorption are compared using a simplified hydrodynamic model. Net charges are calculated on the basis of estimated friction coefficients for cylindrical rodlike particles. The effects of functionalization with negatively charged 4-hydroxybenzene diazonium and anionic sodium cholate are quantified and compared with model predictions. The adsorption of Na+ counterions into the nonionic surfactant layer adsorbed on SWNTs ( Triton-X-405) is shown to induce a positive charge and reverse the mobility under select conditions. This effect has not been identified or quantified for nanoparticle systems and may be important in the processing of these systems.