The viscosity of dilute carbon nanotube (1D) and graphene oxide (2D) nanofluids

Ansón‐Casaos, Alejandro; Ciria, J. C.; Sanahuja‐Parejo, Olga; Víctor-Román, Sandra; González‐Domínguez, José M.; García‐Bordejé, Enrique; Benito, Ana M.; Maser, Wolfgang K.

doi:10.1039/d0cp00468e

Cited by 24 publications

(6 citation statements)

References 61 publications

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“…One explanation for the reduction in polymer viscosity could be that it is due to the presence of radical degeneration from the PG, which happens when produced radicals react with the polymer backbone, resulting in a reduction of molecular weight [37]. A study into the viscosity of graphene oxide nanoparticles dispersed in water however, did not observe the reduction of viscosity with an increase in graphene concentration [38]. The study concluded that the viscosity was due to particle concentration and temperature, and this suggests that the reduction in viscosity is due to the interaction of the PCL polymer backbone and PG.…”

Section: Characterisation Of Fibresmentioning

confidence: 99%

Porous Graphene Composite Polymer Fibres

et al. 2020

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Since the isolation of graphene, there have been boundless pursuits to exploit the many superior properties that this material possesses; nearing the two-decade mark, progress has been made, but more is yet to be done for it to be truly exploited at a commercial scale. Porous graphene (PG) has recently been explored as a promising membrane material for polymer composite fibres. However, controlling the incorporation of high surface area PG into polymer fibres remain largely unexplored. Additionally, most polymer-graphene composites suffer from low production rates and yields. In this paper, graphene-loaded microfibres, which can be produced at a very high rate and yield have been formed with a carrier polymer, polycaprolactone. For the first time, PG has been incorporated into polymer matrices produced by a high-output manufacturing process and analysed via multiple techniques; scanning electron microscopy (SEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Raman spectra showed that single layer graphene structures were achieved, evidence for which was also backed up by the other techniques. Fibres with an average diameter ranging from 3–8 μm were produced with 3–5 wt% PG. Here, we show how PG can be easily processed into polymeric fibres, allowing for widespread use in electrical and ultrafiltration systems

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Section: Characterisation Of Fibresmentioning

confidence: 99%

Porous Graphene Composite Polymer Fibres

et al. 2020

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“…As the fullerene cluster size decreases the viscosity also decreases, which agrees with previous observations for oxide nanoparticles, carbon nanotubes, and graphene oxide. 26,27 The wear scars on the balls after friction tests (Figure S2a MO is widely used as a lubricant that can be enhanced with the addition of nanomaterials. The MO and nano oils (MO/ C 60/70 , MO/T2.5/C 60/70 , and MO/T25/C 60/70 ) were evaluated by the ball on disk method to understand their lubrication properties.…”

Section: Resultsmentioning

confidence: 99%

“…The fullerene powder used in this study contains a mixture of C 60 , C 70 , higher fullerenes, and carbon particles to use a product with a lower cost than a high-purity C 60 sample. The nanoparticle size and concentration have been reported to modify the viscosity of lubricants, , thus, it is necessary to estimate the fullerene cluster size, concentration, and C 60 /C 70 ratio in the MO/C 60/70 mixtures. Therefore, the MO/C 60/70 mixtures were characterized by high-performance liquid chromatography (HPLC) and dynamic light scattering (DLS) (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

Tuning Autoxidation and Friction of Mineral Oil by Fullerene Cluster Properties

Morelos-Gómez

Kondo²,

Omori³

et al. 2023

Ind. Eng. Chem. Res.

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Lubricant oils can autoxidize due to contact with air and can be accelerated by heat and catalyzed with metal ion impurities. Therefore, new antioxidant additives are needed. Carbon nanomaterials exhibit excellent thermal oxidation resistance and can act as additives for lubricant oils to extend their operational lifetime. In this work, we studied the autoxidation behavior of a mixture of C60/C70 clusters in mineral oil (MO) containing different amounts of toluene during mixing. The addition of toluene during mixing increased the ratio of C60/C70 and the cluster size. The oil-fullerene mixtures (MO/C60/70) were heated at 150 °C for 48 h under magnetic stirring. FTIR analysis and TGA showed that the initial oxidation rate and high thermal oxidation (ca. 375 °C) decreased with the addition of fullerenes. Ball on disk friction tests showed that fullerenes effectively reduced the friction coefficient, favored by smaller C60/70 clusters. The obtained results demonstrate that small fullerene clusters with high C70 content can be achieved without the addition of toluene in mineral oil and exhibit higher antioxidation, and lower friction coefficient. Thus, fullerenes could be of high interest as an additive for lubricant oils.

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“…% of metal oxides, and MWCNTs had an average diameter and length of 9.5 nm and 1.5 μm, respectively, according to the provider. The complete characterization of the solid, including elemental analysis and Raman spectrum, as well as its dispersion properties, have been previously published [ 31 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

Carbon Nanotube Film Electrodes with Acrylic Additives: Blocking Electrochemical Charge Transfer Reactions

et al. 2020

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Carbon nanotubes (CNTs) processed into conductive films by liquid phase deposition technologies reveal increasing interest as electrode components in electrochemical device platforms for sensing and energy storage applications. In this work we show that the addition of acrylic latex to water-based CNT inks not only favors the fabrication of stable and robust flexible electrodes on plastic substrates but, moreover, sensitively enables the control of their electrical and electrochemical transport properties. Importantly, within a given concentration range, the acrylic additive in the films, being used as working electrodes, effectively blocks undesired faradaic transfer reactions across the electrode–electrolyte interface while maintaining their capacitance response as probed in a three-electrode electrochemical device configuration. Our results suggest a valuable strategy to enhance the chemical stability of CNT film electrodes and to suppress non-specific parasitic electrochemical reactions of relevance to electroanalytical and energy storage applications.

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The viscosity of dilute carbon nanotube (1D) and graphene oxide (2D) nanofluids

Abstract: The interpretation of viscosity facilitates the understanding of motion modes in liquid dispersions containing 1D and 2D nanoparticles.

Cited by 24 publications

References 61 publications

Porous Graphene Composite Polymer Fibres

Porous Graphene Composite Polymer Fibres

Tuning Autoxidation and Friction of Mineral Oil by Fullerene Cluster Properties

Carbon Nanotube Film Electrodes with Acrylic Additives: Blocking Electrochemical Charge Transfer Reactions

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