Fast and clean functionalization of carbon nanotubes by dielectric barrier discharge plasma in air compared to acid treatment

Vesali‐Naseh, Masoud; Khodadadi, Abbas Ali; Mortazavi, Yadollah; Pourfayaz, Fathollah; Alizadeh, Ommolbanin; Maghrebi, Morteza

doi:10.1016/j.carbon.2009.12.027

Cited by 153 publications

(99 citation statements)

References 32 publications

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“…The peak centered at around J. Minerals and Materials Characterization and Engineering , is mainly due to the presence of amorphous carbon and defects in the sample [27]. These two positions are close to 1346 cm −1 and 1578 cm −1 which have been reported in the literature as features for multi-walled nanotubes concentric hexagonal lattice [28].…”

Section: Raman Spectroscopy Studies Of Carbon Nanotubessupporting

confidence: 69%

Carbon Nanotube Filters for Removal of Air Pollutants from Mobile Sources

Romero-Guzmán¹,

Reyes-Gutiérrez²,

Romero-Guzmán³

et al. 2018

JMMCE

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The aim of this work was the assessment of the removal of air pollutants from mobile sources by commercial carbon nanotubes (CNTs). For this, the nanomaterial was characterized by different techniques: SEM, EDS, TEM, XRD, BET, and Raman. Subsequently, the CNTs were packed in a stainless steel filters which was designed from different prototypes that were developed during the investigation. Tests were performed in the TO-913 Verificenter Macrover Auto SAQ. Inc. de CV. The results revealed that particle type sand CNTs loading had greater effects on the efficiencies than the membrane type sand pore sizes tested. When collecting NO x , the efficiencies were observed relatively lower, below 20% for loadings of 0.3 -1.5 mg/cm 2 . The studied CNTs were multi-walled: two layers, show a nonlinear growth and morphology varied since they are of different diameters and longitudes, it was observed that half of the nanotubes were coated with amorphous carbon. The composition is mainly carbon and oxygen, iron is also present. The adsorption capacity of CNTs was significantly influenced by the different aspects, like model, brand, fuel, year and the conditions of each car. The removal efficiencies of CNTs filters were shown to range from 10% to 95% in average for the CNTs loadings of 0.2 -1.6 mg/cm 2 . When collecting CO, CO 2 , NO x , HC, the efficiencies were shown to range from 5% to 60% given similar CNTs loadings used.

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Section: Raman Spectroscopy Studies Of Carbon Nanotubessupporting

confidence: 69%

Carbon Nanotube Filters for Removal of Air Pollutants from Mobile Sources

Romero-Guzmán¹,

Reyes-Gutiérrez²,

Romero-Guzmán³

et al. 2018

JMMCE

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“…These methods range from low pressure plasmas to atmospheric plasmas, such as corona discharge to dielectric barrier discharge, etc. [18][19][20][21][22]. Utilizing plasma methods to treat or modify nanomaterials can widen the range of polymer matrix possibilities, and studying/tailoring those coatings/modifications can increase the nanofillers's dispersion in polymer matrices and enhance the filler/matrix interfacial bonding in order to achieve the desired properties of the resulted polymer nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Plasma Treated Multi-Walled Carbon Nanotubes (MWCNTs) for Epoxy Nanocomposites

Ritts

et al. 2011

Polymers

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Plasma nanocoating of allylamine were deposited on the surfaces of multi-walled carbon nanotubes (MWCNTs) to provide desirable functionalities and thus to tailor the surface characteristics of MWCNTs for improved dispersion and interfacial adhesion in epoxy matrices. Plasma nanocoated MWCNTs were characterized using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), surface contact angle, and pH change measurements. Mechanical testing results showed that epoxy reinforced with 1.0 wt % plasma coated MWCNTs increased the tensile strength by 54% as compared with the pure epoxy control, while epoxy reinforced with untreated MWCNTs have lower tensile strength than the pure epoxy control. Optical and electron microscopic images show enhanced dispersion of plasma coated MWCNTs in epoxy compared to untreated MWCNTs. Plasma nanocoatings from allylamine on MWCNTs could significantly enhance their dispersion and interfacial adhesion in epoxy matrices. Simulation results based on the shear-lag model derived from micromechanics OPEN ACCESSPolymers 2011, 3 2143 also confirmed that plasma nanocoating on MWCNTs significantly improved the epoxy/fillers interface bonding and as a result the increased composite strength.

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“…20,25 As the CNT arrays undergo a dry oxidation treatment, they become more hydrophilic, and all peaks associated with C-OH, C=O and -COOH groups become more pronounced (Figure 8b). At a longer exposure time, the surface concentration of C=O groups decreases slightly while that of C-OH and -COOH groups continues to increase (Figure 8c).…”

Section: Representative Resultsmentioning

confidence: 99%

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Aria

Gharib

2013

JoVE

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In this article, we describe a simple method to reversibly tune the wetting properties of vertically aligned carbon nanotube (CNT) arrays. Here, CNT arrays are defined as densely packed multi-walled carbon nanotubes oriented perpendicular to the growth substrate as a result of a growth process by the standard thermal chemical vapor deposition (CVD) technique.1,2 These CNT arrays are then exposed to vacuum annealing treatment to make them more hydrophobic or to dry oxidation treatment to render them more hydrophilic. The hydrophobic CNT arrays can be turned hydrophilic by exposing them to dry oxidation treatment, while the hydrophilic CNT arrays can be turned hydrophobic by exposing them to vacuum annealing treatment. Using a combination of both treatments, CNT arrays can be repeatedly switched between hydrophilic and hydrophobic.2 Therefore, such combination show a very high potential in many industrial and consumer applications, including drug delivery system and high power density supercapacitors. 3-5The key to vary the wettability of CNT arrays is to control the surface concentration of oxygen adsorbates. Basically oxygen adsorbates can be introduced by exposing the CNT arrays to any oxidation treatment. Here we use dry oxidation treatments, such as oxygen plasma and UV/ozone, to functionalize the surface of CNT with oxygenated functional groups. These oxygenated functional groups allow hydrogen bond between the surface of CNT and water molecules to form, rendering the CNT hydrophilic. To turn them hydrophobic, adsorbed oxygen must be removed from the surface of CNT. Here we employ vacuum annealing treatment to induce oxygen desorption process. CNT arrays with extremely low surface concentration of oxygen adsorbates exhibit a superhydrophobic behavior. Video LinkThe video component of this article can be found at

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Fast and clean functionalization of carbon nanotubes by dielectric barrier discharge plasma in air compared to acid treatment

Cited by 153 publications

References 32 publications

Carbon Nanotube Filters for Removal of Air Pollutants from Mobile Sources

Carbon Nanotube Filters for Removal of Air Pollutants from Mobile Sources

Plasma Treated Multi-Walled Carbon Nanotubes (MWCNTs) for Epoxy Nanocomposites

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

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