A simple solution for the determination of pristine carbon nanotube concentration.

Upon dispersant-assisted exfoliation, pristine carbon nanotubes (CNTs) are divided between the supernatant and precipitate, which makes the determination of dispersant concentration a challenging task. We have developed a thermogravimetric-spectroscopy-based approach to accurately determine the dispersant-assisted CNT (or nanoparticles, in general) concentration in dispersion. A thermogravimetric analysis of the filtered and washed precipitate, that is usually discarded after centrifugation, is used here to accurately calculate the CNT mass in the precipitate and (through mass-balance) its mass in the supernatant. Once the true CNT concentration has been determined, a conventional spectroscopy-based concentration calibration plot is constructed for simple and swift use in further concentration measurements. Such true concentration analysis is crucial for studying the concentration-property relationship.

[1]  Joydeep Das,et al.  Contribution of nano-copper particles to in vivo liver dysfunction and cellular damage: Role of IκBα/NF-κB, MAPKs and mitochondrial signal , 2012, Nanotoxicology.

[2]  Young-Soo Seo,et al.  Spectroscopic studies and electrical properties of transparent conductive films fabricated by using surfactant-stabilized single-walled carbon nanotube suspensions , 2011 .

[3]  I. Park,et al.  Aqueous dispersion of surfactant-modified multiwalled carbon nanotubes and their application as an antibacterial agent , 2011 .

[4]  R. Krishnamoorti,et al.  Understanding surfactant aided aqueous dispersion of multi-walled carbon nanotubes. , 2011, Journal of colloid and interface science.

[5]  Micah J. Green.  Analysis and measurement of carbon nanotube dispersions: nanodispersion versus macrodispersion , 2010 .

[6]  E. Mäder,et al.  Surfactant Assisted Processing of Carbon Nanotube/ Polypropylene Composites: Impact of Surfactants on the Matrix Polymer , 2010 .

[7]  M. S. Jeong,et al.  Evaluating the Degree of Macrodispersion of Carbon Nanotubes using UV-VIS-NIR Absorption Spectroscopy , 2009 .

[8]  Inderpreet Kaur,et al.  Comparative study of carbon nanotube dispersion using surfactants. , 2008, Journal of colloid and interface science.

[9]  Jing Li,et al.  Effects of surfactant treatment on mechanical and electrical properties of CNT/epoxy nanocomposites , 2008 .

[10]  J. Coleman,et al.  Quantitative Evaluation of Surfactant-stabilized Single-walled Carbon Nanotubes: Dispersion Quality and Its Correlation with Zeta Potential , 2008 .

[11]  Oren Regev,et al.  pH effects on BSA-dispersed carbon nanotubes studied by spectroscopy-enhanced composition evaluation techniques. , 2008, Analytical chemistry.

[12]  R. Thiruvengadathan,et al.  Determination of the concentration of single-walled carbon nanotubes in aqueous dispersions using UV-visible absorption spectroscopy. , 2006, Analytical chemistry.

[13]  F. Wei,et al.  The quantitative characterization of the concentration and dispersion of multi-walled carbon nanotubes in suspension by spectrophotometry , 2006 .

[14]  K. Geckeler,et al.  pH-sensitive dispersion and debundling of single-walled carbon nanotubes: lysozyme as a tool. , 2006, Small.

[15]  M. Chhowalla,et al.  Design criteria for transparent single-wall carbon nanotube thin-film transistors. , 2006, Nano letters.

[16]  R. Thiruvengadathan,et al.  Preparation and characterization of a carbon nanotube-lyotropic liquid crystal composite. , 2006, Langmuir : the ACS journal of surfaces and colloids.

[17]  I. Szleifer,et al.  Polymers and carbon nanotubes : dimensionality, interactions and nanotechnology , 2005 .

[18]  Y. Cohen,et al.  Conformation of Polymers Dispersing Single-Walled Carbon Nanotubes in Water: A Small-Angle Neutron Scattering Study , 2005 .

[19]  Mei Lu,et al.  Thermal and mechanical properties of single-walled carbon nanotube bundle-reinforced epoxy nanocomposites : the role of solvent for nanotube dispersion , 2005 .

[20]  Andre K. Geim,et al.  Electric Field Effect in Atomically Thin Carbon Films , 2004, Science.

[21]  R. Tenne.  Advances in the synthesis of inorganic nanotubes and fullerene-like nanoparticles. , 2003, Angewandte Chemie.

[22]  V. C. Moore,et al.  Individually suspended single-walled carbon nanotubes in various surfactants , 2003 .

[23]  M. Zheng,et al.  DNA-assisted dispersion and separation of carbon nanotubes , 2003, Nature materials.

[24]  Werner J. Blau,et al.  High-Yield, Nondestructive Purification and Quantification Method for Multiwalled Carbon Nanotubes , 2002 .

[25]  M. Prato,et al.  Organic functionalization of carbon nanotubes. , 2002, Journal of the American Chemical Society.

[26]  P. Poulin,et al.  Macroscopic fibers and ribbons of oriented carbon nanotubes. , 2000, Science.

[27]  R. Tenne,et al.  Polyhedral and cylindrical structures of tungsten disulphide , 1992, Nature.

[28]  S. Iijima.  Helical microtubules of graphitic carbon , 1991, Nature.

[29]  B. Masereel,et al.  Dispersion of multi-walled carbon nanotubes in biocompatible dispersants , 2010 .

[30]  R. Bandyopadhyaya,et al.  Stabilization of Individual Carbon Nanotubes in Aqueous Solutions , 2002 .

[31]  James M. Tour,et al.  Dissolution of small diameter single-wall carbon nanotubes in organic solvents? , 2001 .

[32]  M. Burghard,et al.  Separation of carbon nanotubes by size exclusion chromatography , 1998 .