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

被引：20

作者：

Usrey, Monica L. ^{[1
]}

Nair, Nitish ^{[1
]}

Agnew, Daniel E. ^{[1
]}

Pina, Cesar F. ^{[1
]}

Strano, Michael S. ^{[1
]}

机构：

[1] Univ Illinois, Dept Chem & Biomol Engn, Urbana, IL 61801 USA

来源：

LANGMUIR | 2007年 / 23卷 / 14期

关键词：

CAPILLARY-ELECTROPHORESIS; ENHANCED SEPARATION; RAMAN-SPECTROSCOPY; PALISADE LAYER; TRITON X-100; FLUORESCENCE; SOLVATION; MICELLE; FUNCTIONALIZATION; ELECTROLYTES;

D O I：

10.1021/la063667t

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：7768 / 7776

页数：9

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