Covalent Functionalization of HiPco Single‐Walled Carbon Nanotubes: Differences in the Oxidizing Action of H2SO4 and HNO3 during a Soft Oxidation Process

Devaux, Xavier; Vigolo, Brigitte; McRae, E.; Valsaque, Fabrice; Allali, Naoual; Mamane, Victor; Fort, Yves; Солдатов, А. В.; Dossot, Manuel; Tsareva, Svetlana Yu.

doi:10.1002/cphc.201500248

Cited by 7 publications

(8 citation statements)

References 49 publications

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“…Oxidation of SWCNTs using concentrated HNO 3 (65% w/w, 14.3 M) or 2.5 M H 2 SO 4 , and subsequent treatment with SOCl 2 were realized following the previously described protocols [ 9 , 27 – 28 ]. We obtained COCl-SWCNT samples that were then used to covalently graft ferrocene derivatives on the CNT sidewalls.…”

Section: Resultsmentioning

confidence: 99%

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Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

Allali

Urbanová

Etienne

et al. 2018

Beilstein J. Nanotechnol.

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Single-walled carbon nanotubes (SWCNTs) were functionalized by ferrocene through ethyleneglycol chains of different lengths (FcETGn) and the functionalized SWCNTs (f-SWCNTs) were characterized by different complementary analytical techniques. In particular, high-resolution scanning electron transmission microscopy (HRSTEM) and electron energy loss spectroscopy (EELS) analyses support that the outer tubes of the carbon-nanotube bundles were covalently grafted with FcETGn groups. This result confirms that the electrocatalytic effect observed during the oxidation of the reduced form of nicotinamide adenine dinucleotide (NADH) co-factor by the f-SWCNTs is due to the presence of grafted ferrocene derivatives playing the role of a mediator. This work clearly proves that residual impurities present in our SWCNT sample (below 5 wt. %) play no role in the electrocatalytic oxidation of NADH. Moreover, molecular dynamic simulations confirm the essential role of the PEG linker in the efficiency of the bioelectrochemical device in water, due to the favorable interaction between the ETG units and water molecules that prevents π-stacking of the ferrocene unit on the surface of the CNTs. This system can be applied to biosensing, as exemplified for glucose detection. The well-controlled and well-characterized functionalization of essentially clean SWCNTs enabled us to establish the maximum level of impurity content, below which the f-SWCNT intrinsic electrochemical activity is not jeopardized.

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Section: Resultsmentioning

confidence: 99%

“…General: COCl-SWCNTs were prepared according to [ 27 ]. FcETG n derivatives were synthesized according to [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

Allali

Urbanová

Etienne

et al. 2018

Beilstein J. Nanotechnol.

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“…This seems to indicate that hydrophobic domains are probably still present on the MWCNT surface. Indeed, even if the internal walls remain untouched after the applied chemical treatment, this kind of applied oxidation is known to preferentially occur at the defect sites and the extremities of the MWCNTs leading to a non-homogeneous positioning of the functional groups on the MWCNT surface[26,27]. At the nanometer scale, some areas (cylindrical parts of nanotubes) are certainly more hydrophobic and other areas (MWCNT extremities) more hydrophilic; these latter playing the major role for the CNT dispersion within both DW and Tyfocor.14 Optical microscopy images shown in Figure 4 evidence that both prepared nanofluids (in DW, Fig.…”

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confidence: 99%

Surface tension of functionalized MWCNT-based nanofluids in water and commercial propylene-glycol mixture

Berrada

Hamze

Desforges

et al. 2019

Journal of Molecular Liquids

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To cite this version:Nawal Berrada, Samah Hamze, Alexandre Desforges, Jaafar Ghanbaja, Jérôme Gleize, et al.. Surface tension of functionalized MWCNT-based nanofluids in water and commercial propylene-glycol mixture. Abstract:Nanofluids which consist of the addition of nanoparticles in a base fluid are envisaged for a large domain of applications. For many of them, the surface tension (ST) behavior of the prepared nanofluids is a key parameter to exploit their thermophysical properties. Due to their remarkable properties, carbon nanotubes (CNTs) are commonly used to develop nanofluids. However, the evolution of the ST of CNT-based nanofluids is still far from being understood and predictable.In the present work, two base fluids were used: water and a commercial mixture of propyleneglycol/water (around 40:60 wt.%). The impact of the used multi-walled CNT (MWCNT) addition, MWCNT concentration (0.001 and 0.1 wt.%) and temperature variation (273.15-333.15 K) on the density and ST evolution for the two kinds of CNT-based nanofluids is studied. The 2 chemically modified MWCNTs are assumed to bear both localized hydrophilic areas due to grafted functional groups and remaining hydrophobic surfaces. The found difference in ST behavior between the two types of nanofluids is explained in light with the involved interfaces in each nanofluid. ST evolution is found to strongly depend on the CNT surface properties.

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“…8,9 The most common process consists in using concentrated acid solutions of HCl, H 2 SO 4 , HNO 3 or a mixture of H 2 SO 4 /HNO 3 , which remove most of the amorphous carbon and metallic catalysts. [10][11][12] This also promotes chemical modification of the CNT surface with the creation of several oxygen functional groups and topological defects.…”

Section: Introductionmentioning

confidence: 99%

“…Devaux et al 12 explored the covalent functionalization of single-walled carbon nanotubes (SWCNTs) through mild oxidation in an acid solution of H 2 SO 4 and HNO 3 . The products were analyzed by Raman and infrared spectroscopies.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Single-Walled Carbon Nanotubes under Controlled Chemical Conditions

Porto

Silva

Santos

et al. 2018

J. Braz. Chem. Soc.

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Single-walled carbon nanotubes are oxidized in the presence of H 2 SO 4 /HNO 3 mixtures containing distinct concentrations of the nitronium ion, [NO 2 + ]. The spectroscopic analyses of the final samples suggest a higher structural disorder in the oxidized systems with increasing [NO 2 + ]. This is due to a considerable oxygen amount on the tube surface, reaching up to 30%, depending on the reaction time and [NO 2 + ]. Interestingly, if long reaction time is considered, the oxygen amount on the tube surface is maximum for low [NO 2 + ] and reduces slightly for larger [NO 2 + ]. On the other hand, the oxidation process occurs gradually at 4 h, allowing a fine control of the oxidation process. Therefore, if fine tuning of the oxidation degree is desirable, the reaction must be conducted during short time (4 h) using increasing [NO 2 + ] as those obtained from 2:1, 2.5:1 and 3:1 H 2 SO 4 /HNO 3 acid mixtures to produce increasing content of functionalization.

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Covalent Functionalization of HiPco Single‐Walled Carbon Nanotubes: Differences in the Oxidizing Action of H₂SO₄ and HNO₃ during a Soft Oxidation Process

Cited by 7 publications

References 49 publications

Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

Accurate control of the covalent functionalization of single-walled carbon nanotubes for the electro-enzymatically controlled oxidation of biomolecules

Surface tension of functionalized MWCNT-based nanofluids in water and commercial propylene-glycol mixture

Oxidation of Single-Walled Carbon Nanotubes under Controlled Chemical Conditions

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