Binding Kinetics and SWNT Bundle Dissociation in Low Concentration Polymer−Nanotube Dispersions

Coleman, Jonathan N.; Fleming, Alexander J.; Maier, Stefanie; O’Flaherty, Seán M.; Minett, Andrew I.; Ferreira, M. S.; Hutzler, Stefan; Blau, Werner J.

doi:10.1021/jp036651+

Cited by 65 publications

(142 citation statements)

References 19 publications

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“…As can be seen in Fig. 3 the emission ratio plots follow an approximate trend to that proposed by the original model (Coleman et al, 2004). However, a significant degree of deviation from the model fit can be observed.…”

Section: Spectroscopic Analysismentioning

confidence: 63%

“…This increased degree of deviation can be attributed to the increased variability introduced to the system by the filtration and centrifugation process. Despite the inability to reliably fit the data to the model proposed by Coleman et al (2004) it can be clearly seen in the ratio plots of Fig. 3 that the incorporation and removal of the carbon based nanoparticles into the medium altered its emission characteristics giving further supportive evidence for the alteration of the medium upon interaction with the SWCNT.…”

Section: Spectroscopic Analysismentioning

confidence: 93%

“…Fluorescence studies have been shown to aid in the elucidation of the interaction of nanotubes with different molecular species (Keogh et al, 2005;Hedderman et al, 2006). In an earlier study (Casey et al, 2007a) a model derived by Coleman et al (2004) was adapted and employed to assess the degree of interaction between SWCNT and cell culture medium. Eq.…”

Section: Spectroscopic Analysismentioning

confidence: 99%

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Single walled carbon nanotubes induce indirect cytotoxicity by medium depletion in A549 lung cells

Casey¹,

Herzog²,

Lyng³

et al. 2008

Toxicology Letters

166

113

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Single walled carbon nanotubes induce indirect cytotoxicity by medium depletion in A549 lung cells." Toxicology Letters, 179, 78-84 (2008) t r a c tThe ability of two types of single walled carbon nanotubes (SWCNT), namely Arc Discharge (AD) and HiPco ® single walled carbon nanotubes, to induce an indirect cytotoxicity in A549 lung cells by means of medium depletion was investigated. The nanotubes were dispersed in a commercial cell culture medium and subsequently removed by centrifugation and filtration. Spectroscopic analysis confirmed the removal of the nanotubes and showed differing degrees of alteration of the composition of the medium upon the removal of the nanotubes. The ability to induce an indirect cytotoxic effect by altering the medium was evaluated using two endpoints, namely the Alamar Blue (AB) and the Clonogenic assay. Exposure of the A549 cells to the depleted medium which had previously contained carbonaceous nanoparticles, revealed significant cytotoxicity for both endpoints employed. The results presented demonstrate that single walled carbon nanotubes can induce an indirect cytotoxicity by alteration of cell culture medium (in which they have previously been dispersed) which potentially results in a false positive toxic effect being observed in cytotoxicity studies.

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Section: Spectroscopic Analysismentioning

confidence: 63%

Section: Spectroscopic Analysismentioning

confidence: 93%

Section: Spectroscopic Analysismentioning

confidence: 99%

See 1 more Smart Citation

Single walled carbon nanotubes induce indirect cytotoxicity by medium depletion in A549 lung cells

Casey¹,

Herzog²,

Lyng³

et al. 2008

Toxicology Letters

166

113

View full text Add to dashboard Cite

show abstract

“…Another study did not present the data in the appropriate graphical format (the x-axis was presented in terms of added polymer and not equilibrium polymer) but enough information was given so that such a plot could be constructed. 23 In another study where the nanotubes were dispersed in solution, 24 the authors presented the ratio adsorbed polymer/ total polymer (from which the adsorbed amount could be calculated); however the x-axis was also presented in terms of amount added instead of amount in solution after absorption, and the polymer:nanotube mass ratio was fixed at 1:1. The authors showed that there was a relative maximum in the ratio adsorbed polymer/total polymer at an added polymer or nanotube concentration of about 10 À4 kg/m 3 , while a relative minimum occurred at about 10 À3 kg/m 3 .…”

Section: Reviewmentioning

confidence: 99%

Effects of carbon nanotubes on polymer physics

Grady

2012

J Polym Sci B Polym Phys

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A single carbon nanotube has many similarities with an individual polymer chain including the fact that the end-to-end length of both are often about the same and the diameter of the chain is about the same (for single-walled nanotubes) or only $10 to 20 times larger (for multiwalled nanotubes). The combination of the solid surface and the similarity of the two materials means that polymer physics are altered in manners not seen with any other type of commonly used filler. The purpose of this review is to update a chapter that appears in a recent tome by Grady (2011) and describe how polymer physics is altered in composites that contain carbon nanotubes. Subjects that will be discussed include chain configuration, glass transition, polymer diffusion, unit cells and crystalline superstructure (lamellae, spherulites and shishkebabs), and crystallization kinetics. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 2012

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“…Single-walled carbon nanotubes (SWCNT) have generated much interest in recent years due to their unique properties and huge potential for applications 1 . However, some fundamental problems remain to be addressed.…”

Section: Introductionmentioning

confidence: 99%

Effect of solvent and dispersant on the bundle dissociation of single-walled carbon nanotube

et al. 2005

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Single-wall carbon nanotubes (SWCNT) are severely restricted in their applications, as they exist in rope-like bundles. Recently, J. Coleman et al. demonstrated a spectroscopic method to monitor bundle dissociation in low concentration NT-polymer composites.1 The method relies on the measurement of the ratio of free-polymer to the nanotube-bound polymer in the SWCNT-polymer solutions via luminescent spectroscopy. A theory has been developed to transform this data into the bundle surface area, which is of course related to the bundle size. This method clearly shows that individual, isolated SWCNT are stable in low concentration dispersions. The main aim of this work is to better understanding of the physics behind polymer -SWCNT interactions, the binding scheme, and the magnitude of the polymer -SWCNT binding energy. In an effort to broaden the understanding of the physical processes governing the NT de-bundling a wide range of suitable polymers and short-chain molecules have been examined. We found a strong dependence of the concentration at which individual NTs become stable with the nature of the dispersant molecule.

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Binding Kinetics and SWNT Bundle Dissociation in Low Concentration Polymer−Nanotube Dispersions

Cited by 65 publications

References 19 publications

Single walled carbon nanotubes induce indirect cytotoxicity by medium depletion in A549 lung cells

Single walled carbon nanotubes induce indirect cytotoxicity by medium depletion in A549 lung cells

Effects of carbon nanotubes on polymer physics

Effect of solvent and dispersant on the bundle dissociation of single-walled carbon nanotube

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