Physical functionalization of multi-walled carbon nanotubes for enhanced dispersibility in aqueous medium

Youssry, Mohamed; Al-Ruwaidhi, Maisa; Zakeri, Mahdiyeh; Zakeri, Mohadese

doi:10.1007/s42247-020-00076-3

Cited by 33 publications

(12 citation statements)

References 64 publications

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“…These features confirm that surface functional groups are formed at C-MeOH2 and C-CA1 after chemical treatment by IMH in the presence of methanol and citric acid, respectively. The successful incorporation of OH, C-O and CH 3 onto the carbon plays a key role because these functional groups represent favorable sites for Pt ion adsorption, preventing the agglomeration of Pt into large nanoparticles (Youssry, Al-Ruwaidhi, Zakeri, & Zakeri, 2020). These results correlate well with the crystallite size determined from XRD analysis (Table 1).…”

Section: Fig 5 Ftir Spectra Of Untreated Vulcan C-meoh2 and C-ca1 (See Table 1 For Functionalization Conditions)supporting

confidence: 60%

Cost-effective functionalization of Vulcan XC-72 by using the intermittent microwave heating process as nanocatalyst support for ethanol electrooxidation in acid media

Pech-Rodríguez

Rodríguez-Varela²,

Rocha–Rangel³

et al. 2021

RMIQ

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Section: Fig 5 Ftir Spectra Of Untreated Vulcan C-meoh2 and C-ca1 (See Table 1 For Functionalization Conditions)supporting

confidence: 60%

Cost-effective functionalization of Vulcan XC-72 by using the intermittent microwave heating process as nanocatalyst support for ethanol electrooxidation in acid media

Pech-Rodríguez

Rodríguez-Varela²,

Rocha–Rangel³

et al. 2021

RMIQ

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“…These results suggest that the CNPs interact with Tween-80 via the fatty acid chain, presumably by π–π interactions between sp 2 hybrid carbons of the oleic acid side chain and sp 2 hybrid carbons of CNPs. A similar mechanism involving π–π interactions has also been proposed to explain dispersion of CNTs by surfactants like sodium dodecylbenzene sulfonate , and Triton-X series of surfactants. , …”

Section: Resultsmentioning

confidence: 78%

Stabilization of Carbon Nanotubes and Graphene by Tween-80: Mechanistic Insights from Spectroscopic and Simulation Studies

et al. 2022

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Polyoxyethylene sorbitan monooleate is commonly used to obtain stable dispersions of nanoparticles (NPs) such as carbon nanotubes (CNTs) and graphene. However, the mechanism underlying dispersion is poorly understood. The present study aimed at investigating the mechanism of stabilization of carbon NPs (CNPs), namely, single-walled CNTs (SWCNTs), multi-walled CNTs (MWCNTs), and graphene, by Tween-80 using attenuated total internal reflection–Fourier transform infrared and nuclear magnetic resonance (NMR) spectroscopy. Molecular dynamics (MD) simulations were performed to identify, at the atomic scale, the significant interactions that underlie the adsorption and the stabilizing effect of Tween-80 on CNPs, in this way corroborating the spectroscopy results. Spectroscopic analysis revealed that the alkyl chain tether to SWCNT, MWCNT, and graphene surface, presumably through π–π interactions between the carbon–carbon double bond in the alkyl chain and the aromatic rings of CNPs. The hydrophilic polyethoxylate chains extend into the aqueous environment and stabilize the suspension by steric hindrance. MD simulations also showed that Tween-80 molecules interact with the CNP surface via the alkyl chain, thus corroborating spectroscopy results. MD simulations additionally revealed that Tween-80 aggregates on the CNP surface shifted from planar to micelle-like with increasing Tween-80 ratios, underscoring concentration-dependent changes in the nature of these interactions.

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“…The water contact angle images of epoxy resin and MWNT-added UV epoxy resin are shown in Figure 4 a. The contact angle of the MWNT-added UV epoxy resin (87.9°) was larger than that of the bare epoxy resin (81.1°) [ 46 ]. For further investigation, water vapour transmittance rate (WVTR) and oxygen transmittance rate (OTR) tests were performed; they revealed the barrier ability against water and oxygen, respectively.…”

Section: Resultsmentioning

confidence: 99%

Multi-Walled Carbon Nanotube-Assisted Encapsulation Approach for Stable Perovskite Solar Cells

et al. 2021

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Perovskite solar cells (PSCs) are regarded as the next-generation thin-film energy harvester, owing to their high performance. However, there is a lack of studies on their encapsulation technology, which is critical for resolving their shortcomings, such as their degradation by oxygen and moisture. It is determined that the moisture intrusion and the heat trapped within the encapsulating cover glass of PSCs influenced the operating stability of the devices. Therefore, we improved the moisture and oxygen barrier ability and heat releasing capability in the passivation of PSCs by adding multi-walled carbon nanotubes to the epoxy resin used for encapsulation. The 0.5 wt% of carbon nanotube-added resin-based encapsulated PSCs exhibited a more stable operation with a ca. 30% efficiency decrease compared to the ca. 63% decrease in the reference devices over one week under continuous operation. Specifically, the short-circuit current density and the fill factor, which are affected by moisture and oxygen-driven degradation, as well as the open-circuit voltage, which is affected by thermal damage, were higher for the multi-walled carbon nanotube-added encapsulated devices than the control devices, after the stability test.

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Physical functionalization of multi-walled carbon nanotubes for enhanced dispersibility in aqueous medium

Cited by 33 publications

References 64 publications

Cost-effective functionalization of Vulcan XC-72 by using the intermittent microwave heating process as nanocatalyst support for ethanol electrooxidation in acid media

Cost-effective functionalization of Vulcan XC-72 by using the intermittent microwave heating process as nanocatalyst support for ethanol electrooxidation in acid media

Stabilization of Carbon Nanotubes and Graphene by Tween-80: Mechanistic Insights from Spectroscopic and Simulation Studies

Multi-Walled Carbon Nanotube-Assisted Encapsulation Approach for Stable Perovskite Solar Cells

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