Fast functionalization of multi-walled carbon nanotubes by an atmospheric pressure plasma jet

Kolacyak, Daniel; Ihde, Jörg; Merten, Christian; Hartwig, Andreas; Lommatzsch, Uwe

doi:10.1016/j.jcis.2011.03.069

Cited by 51 publications

(22 citation statements)

References 41 publications

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“…XPS, MRS, and HRTEM are commonly utilized to evaluate efficiency and selectivity of the chemical oxidation of CNTs, as well as side effects on the structure of the graphitic network . The quantitative analysis of survey and high‐resolution XPS spectra allows determining elemental composition of the samples, and identifying and quantifying surface‐oxygenated groups . In turn, from these results, the oxidation degree of CNTs and the selectivity towards the formation of a specific oxygenated moiety can be assessed.…”

Section: Resultsmentioning

confidence: 99%

Controlled surface functionalization of carbon nanotubes by nitric acid vapors generated from sub-azeotropic solution

Santangelo

2015

Surf. Interface Anal.

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Controlled surface modification of nanocarbons is crucial for their use in applications. The paper deals with the functionalization of carbon nanotubes (CNTs) with HNO 3 vapors. Sub-azeotropic HNO 3 + H 2 O + Mg(NO 3 ) 2 solution is used for the generation of nitric acid vapors. Because this approach allows tuning the HNO 3 concentration in the vapor phase, the effect of its variation on the surface chemistry and structural properties of the CNTs is investigated. A combination of analytical techniques is applied to evaluate oxidation extent of the CNT surface, selectivity towards the formation of carboxyl groups compared with other oxygenated functionalities, and CNT integrity. The comparison with liquid-phase functionalization in H 2 SO 4 + HNO 3 mixture (1 : 3-3 : 1 v/v), conventionally utilized for oxidizing CNTs, shows that vapor-phase functionalization affords greater surface oxygen uptakes and higher selectivity towards the formation of carboxyl groups, with smaller tube damage; more importantly, it evidences that, regardless of the method and conditions chosen, the selectivity towards carboxyl groups increases linearly with the surface oxygen concentration. The presented results prove that the product of HNO 3 concentration in the vapor-phase (25-93 wt%) and vapor-phase functionalization duration (0.5-5 h) controls the surface oxygen concentration. A simple rate model is proposed to account for its increase.

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Section: Resultsmentioning

confidence: 99%

Controlled surface functionalization of carbon nanotubes by nitric acid vapors generated from sub-azeotropic solution

Santangelo

2015

Surf. Interface Anal.

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“…The peak at 1082 cm −1 comes from the stretching vibrations of C O in ethers while the peak at 1240 cm −1 comes from the stretching vibrations of C O in phenols (Chen et al, 2009). The peak at 1377 cm −1 might be attributed to the bending vibrations of O H in carboxyl groups (Kolacyak et al, 2011). The peak at 1528 cm −1 can be assigned to the stretching vibrations of aromatic rings (Ghazali et al, 2012), a peak at 1731 cm −1 may be attributed to the stretching vibrations of C O in carbonyls and carboxyls (Chen et al, 2009) and a peak at 3430 cm −1 is due to the stretching vibrations of O H in adsorbed water (Chen et al, 2012b).…”

Section: Characterization Of the Adsorbentmentioning

confidence: 99%

Study on efficient removal of anionic, cationic and nonionic dyes from aqueous solutions by means of mesoporous carbon nanospheres with empty cavity

Konicki

Cendrowski

Bazarko

et al. 2015

Chemical Engineering Research and Design

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“…Plasma, a partially ionized gas, has proven to have a broad range of industrial and biomedical applications (Bogaerts et al, ; Chen, ; Daeschlein et al, ; Fricke et al, ; Kolacyak et al, ; Park et al, ; Plimpton et al, ). Cold atmospheric plasma (CAP) in general is plasma generated at atmospheric pressure and its rotational temperatures (gas temperatures) are close to ambient temperatures.…”

Section: Introductionmentioning

confidence: 99%

Induction of apoptosis in human myeloid leukemia cells by remote exposure of resistive barrier cold plasma

Thiyagarajan

Anderson

Gonzales

2013

Biotech & Bioengineering

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Cold atmospheric plasma (CAP), an ambient temperature ionized gas, is gaining extensive interest as a promising addition to anti-tumor therapy primarily due to the ability to generate and control delivery of electrons, ions, excited molecules, UV photons, and reactive species such as reactive oxygen species (ROS) and reactive nitrogen species (RNS) to a specific site. The heterogeneous composition of CAP offers the opportunity to mediate several signaling pathways that regulate tumor cells. Consequently, the array of CAP generated products has limited the identification of the mechanisms of action on tumor cells. The aim of this work is to assess the cell death response of human myeloid leukemia cells by remote exposure to CAP generated RNS by utilizing a novel resistive barrier discharge system that primarily produces RNS. The effect of variable treatments of CAP generated RNS was tested in THP-1 cell (human monocytic leukemia cell line), a model for hematological malignancy. The number of viable cells was evaluated with erythrosine-B staining, while apoptosis and necrosis was assessed by endonuclease cleavage observed by agarose gel electrophoresis and detection of cells with the exclusionary dye propidium iodide and fluorescently labeled annexin-V by flow cytometry and fluorescent microscopy. Our observations indicate that treatment dosage levels of 45 s of exposure to CAP emitted RNS-induced apoptotic cell death and for higher dosage conditions of ≥50 s of exposure to CAP induced necrosis. Overall the results suggest that CAP emitted RNS play a significant role in the anti-tumor potential of CAP.

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Fast functionalization of multi-walled carbon nanotubes by an atmospheric pressure plasma jet

Cited by 51 publications

References 41 publications

Controlled surface functionalization of carbon nanotubes by nitric acid vapors generated from sub-azeotropic solution

Controlled surface functionalization of carbon nanotubes by nitric acid vapors generated from sub-azeotropic solution

Study on efficient removal of anionic, cationic and nonionic dyes from aqueous solutions by means of mesoporous carbon nanospheres with empty cavity

Induction of apoptosis in human myeloid leukemia cells by remote exposure of resistive barrier cold plasma

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