Effect of Solvent Solubility Parameters on the Dispersion of Single-Walled Carbon Nanotubes

Cheng, Qiaohuan; Debnath, Sourabhi; Gregan, Elizabeth; Byrne, Hugh J.

doi:10.1021/jp8067188

Cited by 50 publications

(57 citation statements)

References 26 publications

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“…Measurements were performed using an integrating sphere to minimize the contributions of scattering to the measured extinction 8,22 . 10-millimeter quartz cuvettes were used for all the measurements.…”

Section: Methodsmentioning

confidence: 99%

“…UV-vis-NIR measurements were carried out on the whole sample before centrifugation (immediately before measurement all samples were vigorously shaken) but only on the supernatant after centrifugation, so that the mass fraction of aggregates can be estimated (see Equation 1). The absorbance at a wavelength of 660 nm was used for all the calculations 6,8,21 .…”

Section: Methodsmentioning

confidence: 99%

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Ultrasound-Assisted SWNTs Dispersion: Effects of Sonication Parameters and Solvent Properties

Cheng¹,

Debnath²,

Gregan³

et al. 2010

J. Phys. Chem. C

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169

127

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Ultra-sonication is widely used for preparing Single-Walled Carbon Nanotube (SWNT) dispersions in different solvent media and it has been shown to play a critical role in dispersing and debundling SWNTs. The strong shear force which can exfoliate the SWNT bundles during sonication comes from cavitation, which entails a process of bubble formation, growth and collapse. The efficiency of the cavitation process is closely correlated to many solvent parameters, including vapour pressure, viscosity, surface tension, as well as the sonication frequency, intensity and time. In this study, SWNTs were dispersed in a range of organic solvents assisted by tip sonication. The effects of sonication intensity and time were investigated in ortho-dichlorobenzene (o-DCB) and dimethylformamide (DMF).The aggregation fraction below the dispersion limit of SWNTs in the range of organic solvents was found to be influenced by the solvent parameters, particularly solvent vapour pressure and viscosity. It is demonstrated that the parameters associated with the sonication process rather than solvent solubility 2 parameters govern the dispersion process. It is further confirmed that significant degradation of the SWNTs is affected during the dispersion process.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Ultrasound-Assisted SWNTs Dispersion: Effects of Sonication Parameters and Solvent Properties

Cheng¹,

Debnath²,

Gregan³

et al. 2010

J. Phys. Chem. C

Self Cite

169

127

View full text Add to dashboard Cite

show abstract

“…In comparison with DMF and NMP, an improvement in the dispersion limit of SWCNTs has been observed for alkyl amide solvents, such as N,N-dimethylacetamide (DMAc), N,N-dimethylpropanamide (DMP) and N,N-diethylacetamide (DEA), and is attributable to the highly polar π-system in conjunction with their optimal geometries (appropriate bond lengths and bond angles) [68]. In addition, chlorinated aromatic solvents, such as mono-chlorobenzene, ortho-dichlorobenzene (ODCB), meta-dichlorobenzene and 1,2,4-trichlorobenzene, have been demonstrated to be efficient at dispersing SWCNTs [69,70]. However, it has been found that phenyl rings within solvent molecules are not the dominant factor in obtaining stable SWCNTs dispersions [71].…”

Section: Carbon Nanotubes In Imidazolium Ionic Liquidsmentioning

confidence: 99%

“…The dispersion quality of CNTs in solvents is also affected by the nanotube concentration and processing techniques as well as the physical parameters of as-produced CNTs [68,69,71]. However, "stable suspensions" of SWCNTs in the best organic solvents (DMF and NMP) still aggregate on a time-scale of days, even minutes, in the absence of any external agents [64].…”

Section: Carbon Nanotubes In Imidazolium Ionic Liquidsmentioning

confidence: 99%

Progress in Imidazolium Ionic Liquids Assisted Fabrication of Carbon Nanotube and Graphene Polymer Composites

et al. 2013

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Carbon nanotubes (CNTs) and graphene sheets are the most promising fillers for polymer nanocomposites due to their superior mechanical, electrical, thermal optical and gas barrier properties, as well as high flame-retardant efficiency. The critical challenge, however, is how to uniformly disperse them into the polymer matrix to achieve a strong interface for good load transfer between the two. This problem is not new but more acute in CNTs and graphene, both because they are intrinsically insoluble and tend to aggregate into bundles and because their surfaces are atomically smooth. Over the past decade, imidazolium ionic liquids (Imi-ILs) have played a multifunctional role (e.g., as solvents, dispersants, stabilizers, compatibilizers, modifiers and additives) in the fabrication of polymer composites containing CNTs or graphene. In this review, we first summarize the liquid-phase exfoliation, stabilization, dispersion of CNTs and graphene in Imi-ILs, as well as the chemical and/or thermal reduction of graphene oxide to graphene with the aid of Imi-ILs. We then present a full survey of the literature on the Imi-ILs assisted fabrication of CNTs and graphene-based nanocomposites with a variety of polymers, including fluoropolymers, hydrocarbon polymers, polyacrylates, cellulose and polymeric ionic liquids. Finally, we give a future outlook in hopes of facilitating progress in this emerging area. OPEN ACCESSPolymers 2013, 5 848

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“…Subsequently, the dispersibility of SWNTs in chlorinated aromatic solvents and other solvents reported in literature, including dimethylformamide (DMF) [5,6], 1,2-dichloroehtane (DCE) [7], chloroform [2], and toluene [8], in terms of optical extinction and absorption coefficients, was compared as a function of Hildebrand and Hansen solubility parameters [9].…”

Section: Introductionmentioning

confidence: 99%

Systematic Study of the Dispersion of SWNTs in Organic Solvents

Cheng¹,

Debnath²,

O’Neill³

et al. 2010

J. Phys. Chem. C

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Dispersions of as-produced HiPco single-walled carbon nanotubes (SWNTs) in a series of organic solvents were prepared by dilution with the aid of tip sonication. Mild centrifugation (~ 945 g) was carried out to remove large bundles. Atomic force microscopy (AFM) studies revealed that the bundle size decreased as the dispersion was diluted. By measuring the UV-vis-NIR absorption before and after centrifugation as a function of the concentration, the dispersion limit of SWNTs in each solvent can be determined. sonication times increase the amount of SWCNTs debundled and solubilised but do not appear to affect the dispersion limit. However, increased sonication also induces discernible changes to the SWNTs themselves and in itself influences their solubility, under which conditions no clear solubility parameters can be determined.

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Effect of Solvent Solubility Parameters on the Dispersion of Single-Walled Carbon Nanotubes

Cited by 50 publications

References 26 publications

Ultrasound-Assisted SWNTs Dispersion: Effects of Sonication Parameters and Solvent Properties

Ultrasound-Assisted SWNTs Dispersion: Effects of Sonication Parameters and Solvent Properties

Progress in Imidazolium Ionic Liquids Assisted Fabrication of Carbon Nanotube and Graphene Polymer Composites

Systematic Study of the Dispersion of SWNTs in Organic Solvents

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