Length sorting cut single wall carbon nanotubes by high performance liquid chromatography

Farkas, Elaine R.; Anderson, Mark E.; Chen, Zhihong; Rinzler, Andrew G.

doi:10.1016/s0009-2614(02)01203-4

Cited by 122 publications

(85 citation statements)

References 11 publications

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“…10%) upon HCl treatment occurred in the case of both MWCNTs (BA = 231 m 2 g -1 , CP = 122 m 2 g -1 ). The small increase of the surface area may be a consequence of the removal of impurities and the additional sonication during the HCl treatment, which may reduce the aggregate size [52]. In the low concentration range which is of considerable environmental interest the Freundlich model properly described the sorption isotherms (r 2  0.92, Table 2).…”

Section: Batch Sorptionmentioning

confidence: 99%

Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes

Schäffer

Séquaris

et al. 2012

Journal of Colloid and Interface Science

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Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes Journal of Colloid and Interface Science, 377, 342-346, 2012 2 AbstractPerfluorooctanoic acid (PFOA) sorption behaviour of two commercial multi-walled carbon nanotubes (MWCNTs) (C 150 P from Bayer MaterialScience: BA and C-MWNTs from NanoTechLabs Inc.: CP) was investigated from aqueous solution. The BA nanotubes contain Co/Mn/Mg/Al catalysts both on their outer surface and in the inner bore while CP contains Fe-based catalyst typically within the tubes. The adsorption isotherms of 14 C-radiolabeled PFOA were measured by batch experiments and fitted to the Freundlich model (r 2 0.92).. The adsorption affinity and capacity on BA were significantly higher than on CP. Increasing the pH reduced the adsorption of PFOA due to the electrostatic interaction between the pH-sensitive surface and the adsorbate. Increasing NaCl concentration lead to the aggregation of the MWCNTs reducing the available surface and thus the adsorption capacity. Removal of the catalyst from the outer surface of BA changed the electrophoretic mobility from positive to negative value also decreasing the adsorbed amount of PFOA. The surface charge of the surface-associated metal catalyst favors the electrostatic sorption of PFOA. Such surface modification may be a promising way to improve the sorption capacity of MWCNTs for pollutants like PFOA and to broaden their potential application in water purification.Keywords: Perfluorooctanoic acid; multi-walled carbon nanotubes; metal catalyst; sorption Chengliang Li, Andreas Schäffer, Jean-Marie Séquaris, Krisztina László, Ajna Tóth, Etelka Tombácz, Harry Vereecken, Rong Ji, Erwin Klumpp Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes

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Section: Batch Sorptionmentioning

confidence: 99%

Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes

Schäffer

Séquaris

et al. 2012

Journal of Colloid and Interface Science

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“…Based on the similar properties of SWCNTs to biological macromolecules in sizes and surface properties, earlier from 1998, researchers have made efforts to separated SWCNTs by the chromatography. Due to the diversity of the stationary and mobile phases, SWCNTs dispersed in solution can be sorted following different separation mechanisms, such as size-exclusion chromatography (SEC) [44][45][46][47][48][49][50] , anion exchange chromatography (IEC) 8, 51-54 and electrokinetic chromatography 46,50,[55][56][57] . By tuning the stationary phase and eluents, the dispersed SWCNTs have been successively sorted by length, m/s, diameter and chirality.…”

Section: Chromatographymentioning

confidence: 99%

“…Different fractions of SWCNTs were eluted out sequentially with 0.25wt% SDS aqueous solution. Later, Farkas et al accordingly undertook to length sort of cut SWCNTs by size exclusion chromatography (SEC) using a HPLC system, 45 promising that efficient length separation with good resolution is feasible on a preparative scale. Further by using three silica-based column resins in series with pore sizes of 2000, 1000, and 300 Å, Huang et al demonstrated that DNA dispersed SWCNTs with very narrow length distribution could be sorted out.…”

Section: Size-exclusion Chromatographymentioning

confidence: 99%

Selective Separation of Single-Walled Carbon Nanotubes in Solution

Li¹,

Li²

2011

Electronic Properties of Carbon Nanotubes

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“…In present studies metallic system has been used as catalyst for the growth of aligned CNTs therefore, these need to be purified. Purification was carried out using acid cleaning method by treating SiC/CNTs sample with HCl (50%) for 24 hours followed by washing with distilled water [16][17][18]. Washed CNTs samples were dried at 70°C for overnight to remove moisture.…”

Section: Preparation Of Cnt Coated Sic Hybrid Reinforcementmentioning

confidence: 99%

Morphological Studies on CNT Reinforced SiC/SiOC Composites

et al. 2010

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Carbon nanotubes (CNTs) have been grown on commercially available silicon carbide (SiC) fabric by the catalytic chemical vapour deposition (CCVD) technique. These CNT coated SiC fabrics were used to develop Silicon Carbide-Carbon Nanotube-Silicon oxy Carbide matrix composites (SiC/CNTs/SiOC) by sol gel technique. Silicon oxy Carbide refers to carbon containing silicates wherein oxygen and carbon atoms share bonds with silicon in the amorphous network structure. In this approach, alkyl-substituted silicon alkoxides, which are molecular precursors containing oxygen and carbon functionalities on the silicon, are hydrolyzed and condensed in the presence of sucrose, which provides excess of carbon to bond into the silicon alkoxide network during hydrolysis. A low-temperature (1000°C) heat-treatment of the gel creates a glassy silicate material whose molecular structure consists of an oxygen/carbon anionic network. The microstructures of these hybrid materials and their composites have been studied using scanning electron microscope (SEM), transmission electron microscope (TEM) and Raman spectroscope.

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Length sorting cut single wall carbon nanotubes by high performance liquid chromatography

Cited by 122 publications

References 11 publications

Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes

Surface-associated metal catalyst enhances the sorption of perfluorooctanoic acid to multi-walled carbon nanotubes

Selective Separation of Single-Walled Carbon Nanotubes in Solution

Morphological Studies on CNT Reinforced SiC/SiOC Composites

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