Cutting Of Carbon Nanotubes Via Solution Plasma Processing

Tong, Dong Ge; Luo, Yongyue; Chu, Wei; Guo, Yuan-Chen; Tian, Wenhuai

doi:10.1007/s11090-010-9262-3

Cited by 20 publications

(12 citation statements)

References 11 publications

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“…But in our case a small peak at approximately 1579 cm −1 is observed, which corresponds to C=C stretching vibration as shown in Figure 2(a) [16,19]. -MWCNTs do not show significant difference in the spectrum from that of the -MWCNTs except for C-H stretching peaks at approximately 2925 to 2975 cm −1 , indicating an increase in the number of sp 3 carbon bonds [16,17,20]. These bonds are assumed to originate from the breakage of C=C bonds.…”

Section: Resultsmentioning

confidence: 47%

“…A variety of different techniques can be used to characterize the surface chemistry of CNTs after covalent functionalization [9,12,15,16]. Among them FT-IR is widely used to ascertain the groups attached onto the functionalized CNTs [16,17]. Therefore, FT-IR spectra of the -MWCNTs, -MWCNTs, and -MWCNTs are measured.…”

Section: Resultsmentioning

confidence: 99%

“…Raman spectrum is an important tool to study the CNT structure [25,26] and is widely used to assess the amount of defects [16,17]. Raman spectra of the -MWCNTs, -MWCNTs, and -MWCNTs are presented in Figure 5, which are normalized and bodily shifted in the intensity axis.…”

Section: Resultsmentioning

confidence: 99%

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Water‐Dispersible Multiwalled Carbon Nanotubes Obtained from Citric‐Acid‐Assisted Oxygen Plasma Functionalization

Rahman

Mieno

2014

Journal of Nanomaterials

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A new and safe method has been developed to functionalize multiwalled carbon nanotubes (MWCNTs) with fewer surface defects, which significantly increases their dispersibility in water. MWCNTs are pretreated in pure ethanol by a supersonic homogenizer. Then, the mixture is dried and soaked in weak citric acid solution. Finally, the MWCNTs in the citric acid solution are treated with radio frequency (13.56 MHz) oxygen plasma. As a result, many carboxyl functional groups are attached onto the MWCNT surfaces and stable dispersion of the MWCNTs in water is obtained. The treatment conditions are optimized in this study.

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Section: Resultsmentioning

confidence: 47%

Section: Resultsmentioning

confidence: 99%

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Water‐Dispersible Multiwalled Carbon Nanotubes Obtained from Citric‐Acid‐Assisted Oxygen Plasma Functionalization

Rahman

Mieno

2014

Journal of Nanomaterials

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“…However, in this form, CNTs are still too long and rigid drug delivery purposes [10]. Furthermore, different fabrication protocols introduce defects as part of the process, whether intentionally or as a side effect [31], [32]. These structural defects have been linked to causing acute lung toxicity, genotoxicity, and inflammatory responses [33]–[36].…”

Section: Discussionmentioning

confidence: 99%

Biosafety of Non-Surface Modified Carbon Nanocapsules as a Potential Alternative to Carbon Nanotubes for Drug Delivery Purposes

et al. 2012

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BackgroundCarbon nanotubes (CNTs) have found wide success in circuitry, photovoltaics, and other applications. In contrast, several hurdles exist in using CNTs towards applications in drug delivery. Raw, non-modified CNTs are widely known for their toxicity. As such, many have attempted to reduce CNT toxicity for intravenous drug delivery purposes by post-process surface modification. Alternatively, a novel sphere-like carbon nanocapsule (CNC) developed by the arc-discharge method holds similar electric and thermal conductivities, as well as high strength. This study investigated the systemic toxicity and biocompatibility of different non-surface modified carbon nanomaterials in mice, including multi-walled carbon nanotubes (MWCNTs), single-walled carbon nanotubes (SWCNTs), carbon nanocapsules (CNCs), and C60 fullerene (C60). The retention of the nanomaterials and systemic effects after intravenous injections were studied.Methodology and Principal FindingsMWCNTs, SWCNTs, CNCs, and C60 were injected intravenously into FVB mice and then sacrificed for tissue section examination. Inflammatory cytokine levels were evaluated with ELISA. Mice receiving injection of MWCNTs or SWCNTs at 50 µg/g b.w. died while C60 injected group survived at a 50% rate. Surprisingly, mortality rate of mice injected with CNCs was only at 10%. Tissue sections revealed that most carbon nanomaterials retained in the lung. Furthermore, serum and lung-tissue cytokine levels did not reveal any inflammatory response compared to those in mice receiving normal saline injection.ConclusionCarbon nanocapsules are more biocompatible than other carbon nanomaterials and are more suitable for intravenous drug delivery. These results indicate potential biomedical use of non-surface modified carbon allotrope. Additionally, functionalization of the carbon nanocapsules could further enhance dispersion and biocompatibility for intravenous injection.

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“…In recent years, the plasma technique has gained attention as a powerful and environmentally friendly approach for the preparation of functional materials [10][11][12][13][14][15][16][17]. Recently, we successfully prepared N-doped TiO 2 nanotube arrays with good photocatalytic activity [17].…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous nitrogen-doped titanium dioxide microspheres and a study of their photocatalytic, antibacterial and electrochemical activities

Chen¹,

Chu²,

Huang³

et al. 2012

Materials Research Bulletin

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Cutting Of Carbon Nanotubes Via Solution Plasma Processing

Cited by 20 publications

References 11 publications

Water‐Dispersible Multiwalled Carbon Nanotubes Obtained from Citric‐Acid‐Assisted Oxygen Plasma Functionalization

Water‐Dispersible Multiwalled Carbon Nanotubes Obtained from Citric‐Acid‐Assisted Oxygen Plasma Functionalization

Biosafety of Non-Surface Modified Carbon Nanocapsules as a Potential Alternative to Carbon Nanotubes for Drug Delivery Purposes

Preparation of porous nitrogen-doped titanium dioxide microspheres and a study of their photocatalytic, antibacterial and electrochemical activities

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