Covalent functionalization of multi-walled carbon nanotubes with quaternary ammonium groups and its application in ion chromatography

Huang, Zhongping; Xi, Lingling; Subhani, Qamar; Yan, Wenwu; Guo, Wenbin; Zhu, Yan

doi:10.1016/j.carbon.2013.06.004

Cited by 53 publications

(20 citation statements)

References 42 publications

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“…For instance, Huang et al . derivatized the surface of MWCNTs to contain quaternary ammonium groups, onto which sulfonated PS‐DVB beads were adsorbed for the separation of inorganic ions (e.g., bromide, chloride, fluoride, nitrate, and nitrite) . The use of this PS‐DVB/MWCNT composite in a 100 mm × 4.0 mm id column gave similar chromatographic behavior and separation efficiencies to those seen with commercial anion‐exchange columns.…”

Section: Nanomaterials In Ion‐exchange Chromatography or Related Sepamentioning

confidence: 96%

“…CNTs have been of interest as stationary phases because of their good stability and their ability to be used as either individual nanoparticles or as aggregates that can undergo various interactions with solutes, including dipole‐dipole interactions, hydrogen bonding, π‐π stacking, and nonpolar interactions, among others . These properties have been found in a number of studies to provide stationary phases based on CNTs with excellent long‐term stabilities and the ability to provide improved retention, resolution, and analysis times for a number of compound classes when compared to traditional LC columns , such as those containing C 18 ‐ or aminopropyl‐silica (e.g., see Sections –) .…”

Section: Types Of Nanomaterials Used In Lcmentioning

confidence: 99%

“…The separation of charged analytes by techniques such as ion‐exchange chromatography or ion‐pair chromatography can also be accomplished by using nanomaterials. Carbon‐based nanomaterials and inorganic nanomaterials have both been modified and explored for use in such separation modes .…”

Section: Nanomaterials In Ion‐exchange Chromatography or Related Sepamentioning

confidence: 99%

“…The use of this PS‐DVB/MWCNT composite in a 100 mm × 4.0 mm id column gave similar chromatographic behavior and separation efficiencies to those seen with commercial anion‐exchange columns. A separation of various inorganic ions with the MWCNT‐containing column gave an efficiency of 20 000 plates/m and good permeability, allowing for potential use of this column at high flow rates . In work by the same group, PS‐DVB beads containing MWCNTs were placed into a 150 mm × 4.6 mm id column and used with tetrabutylammonium hydroxide as an ion‐pairing agent to separate 11 organic acids by ion‐pair chromatography (see Fig.…”

Section: Nanomaterials In Ion‐exchange Chromatography or Related Sepamentioning

confidence: 99%

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Nanomaterials as stationary phases and supports in liquid chromatography

et al. 2017

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The development of various nanomaterials over the last few decades has led to many applications for these materials in liquid chromatography (LC). This review will look at the types of nanomaterials that have been incorporated into LC systems and the applications that have been explored for such systems. A number of carbon-based nanomaterials and inorganic nanomaterials have been considered for use in LC, ranging from carbon nanotubes, fullerenes and nanodiamonds to metal nanoparticles and nanostructures based on silica, alumina, zirconia and titanium dioxide. Many ways have been described for incorporating these nanomaterials into LC systems. These methods have included covalent immobilization, adsorption, entrapment, and the synthesis or direct development of nanomaterials as part of a chromatographic support. Nanomaterials have been used in many types of LC. These applications have included the reversed-phase, normal-phase, ion-exchange, and affinity modes of LC, as well as related methods such as chiral separations, ion-pair chromatography and hydrophilic interaction liquid chromatography. Both small and large analytes (e.g., dyes, drugs, amino acids, peptides and proteins) have been used to evaluate possible applications for these nanomaterial-based methods. The use of nanomaterials in columns, capillaries and planar chromatography has been considered as part of these efforts. Potential advantages of nanomaterials in these applications have included their good chemical and physical stabilities, the variety of interactions many nanomaterials can have with analytes, and their unique retention properties in some separation formats.

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Section: Nanomaterials In Ion‐exchange Chromatography or Related Sepamentioning

confidence: 96%

Section: Types Of Nanomaterials Used In Lcmentioning

confidence: 99%

Section: Nanomaterials In Ion‐exchange Chromatography or Related Sepamentioning

confidence: 99%

Section: Nanomaterials In Ion‐exchange Chromatography or Related Sepamentioning

confidence: 99%

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Nanomaterials as stationary phases and supports in liquid chromatography

et al. 2017

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“…2) [21]. Neat MWCNTs were oxidized in a mixture of HNO 3 and H 2 SO 4 at 70°C for 4 h, affording MWCNT-COOH in 89% yield based on used starting material [22,23] (detailed synthesis procedures are described in the Supplementary information). Mild functionalization of the MWCNT-COOH at room temperature was achieved by 4-dimethylamino pyridine catalyzed reaction with 3 or 4 in DMF using dicyclohexyl carbodiimide as coupling reagent.…”

Section: Synthesismentioning

confidence: 99%