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Year: | 2007 | ||||
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Type of Publication: | Article | ||||||
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Journal: | Langmuir | Volume: | 23 | ||||
Number: | 14 | Pages: | 7768-7776 | ||||
Month: | JUL 3 2007 | ||||||
Note: | PT: J; TC: 15; UT: WOS:000247487200056 |
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Abstract: | 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. |
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