Influence of the ultrasound cavitation intensity on reduced graphene oxide functionalization

Ručigaj, Aleš; Connell, Justin G.; Dular, Matevž; Genorio, Boštjan

doi:10.1016/j.ultsonch.2022.106212

Cited by 16 publications

(11 citation statements)

References 48 publications

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“…Genorio et al reported a study about the influence of the sonication on reduced graphene oxide (rGO), and they observed that at similar operational conditions, the defect density increased by 14.7% with respect to that observed for rGO. The effect of sonication has also been studied in different carbon-based nanomaterials, demonstrating its influence on the morphology and on the functional groups present on the surface of the nanomaterial. − Therefore, other studies are required to determine the incorporation of functional groups, such as amide or siloxane ones. The Raman shifts of GN bands are similar to those of graphite, appearing at 1563 and 1335 cm –1 for the G and D bands, respectively.…”

Section: Resultsmentioning

confidence: 98%

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

Aguila-Toledo,

Maldonado-Magnere,

Yazdani-Pedram

et al. 2023

ACS Appl. Polym. Mater.

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In this work, we develop fluorosilicone elastomer (FSE) compounds with advanced properties by incorporating graphene oxides functionalized with vinyltrimethoxysilane (GO-V) and allyl isocyanate (GO-A). The morphology and structure of the graphene oxides were characterized confirming the successful functionalization, with contents of functional groups of 9.80 and 3.60% for GO-V and GO-A, respectively. The strong elastomer–graphene oxide interaction accelerates the crosslinking reaction and causes an important enhancement of the mechanical properties and thermal stability of composites. In addition, the swelling resistance to acid, base, and organic solvents is improved by more than 30%. These functional properties make FSE/GO composites a promising new class of advanced materials, expanding their potential application in edge technologies, spanning the manufacture of automotive components, aerospace and aviation parts, oil, gas, and petrochemical components, among others, particularly, seals, gaskets, valves and pipelines, or different components exposed to oil or solvent and high temperatures that require higher performance compared to conventional FSE products.

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Section: Resultsmentioning

confidence: 98%

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

Aguila-Toledo,

Maldonado-Magnere,

Yazdani-Pedram

et al. 2023

ACS Appl. Polym. Mater.

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“…3 c), the maximum value (∼50 %) was obtained at ultrasound powers of 300 W and 150 W, respectively. It is well known that the cavitation intensity increases with an increase in the ultrasound power [ [56] , [64] ]. With the increase in input power, the acoustic intensity increases, and the threshold of transient cavitation decreases, which leads to more cavitation bubbles collapsing [ [15] , [65] ].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it is important to note that the ultrasound-assisted synthesis, exfoliation, and functionalization of graphene derivatives using high-grade graphite have been systematically investigated [ [51] , [52] , [53] , [54] , [55] , [56] ]. Li, et al [ 57 ] calculated the selection and breakage functions of ultrasound-assisted exfoliation and breakage process of graphite oxide.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasound power on HCl leaching kinetics of impurity removal of aphanitic graphite

Tong

Bilal

et al. 2023

Ultrasonics Sonochemistry

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“…The influence of the electrode deposition method on the morphology, as described previously, becomes more visible at higher magnification levels (SE detector images in Figure e and Figure S1). The destruction of graphene-based materials during ultrasonication can be an issue as described in the literature. , No destruction of the N-rGO structure through the ultrasonic nozzle during the spray-coating process was observed; nevertheless, no statement can be made about the dispersion of the catalyst inks in the ultrasonic bath since all have undergone the same procedure. The active material is independent of the electrode deposition method uniformly distributed over the entire surface area (Figure e and Figure S1) and the atomic ratio of the elements to each other is in a similar range for all prepared cathodic GDEs (see Table S3 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Influence of the Electrode Deposition Method of Graphene-Based Catalyst Inks for ADEFC on Performance

Roschger,

Wolf,

Hasso

et al. 2023

ACS Appl. Mater. Interfaces

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The utilization of graphene as a catalyst support has garnered significant attention due to its potential for enhancing fuel cell performance. However, a critical challenge in electrode production still lies in the electrode preparation technologies and the restacking of graphene sheets, which can greatly impact the fuel cell performance alongside with catalyst development. This study aimed to investigate the impact of different electrode deposition methods for N-rGO-based catalyst inks on catalyst layer morphology, with a specific focus on graphene sheet orientation and its influence on the performance of alkaline direct ethanol fuel cells (ADEFCs). The dispersion behavior and ink stability of the catalysts were assessed using ultraviolet–visible light (UV-vis), ζ potential, and dynamic light scattering techniques. The morphology and physical properties of the gas diffusion electrodes (GDEs) were analyzed through Brunauer–Emmett–Teller measurements, contact angle measurements and scanning electron microscopy (SEM) combined with energy-dispersive spectroscopy. The electrochemical behavior was evaluated both ex-situ, utilizing half-cell GDE measurements, and in situ, through single-cell tests. The N-rGO-based membrane electrode assembly, comprising Pt-free catalysts and a biobased membrane, exhibited outstanding performance in ADEFCs, as evidenced by high maximum power density values and long-term durability. The N-rGO-based membrane electrode assembly has demonstrated remarkable potential for high-performance fuel cells, presenting an exciting avenue for further exploration.

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Influence of the ultrasound cavitation intensity on reduced graphene oxide functionalization

Cited by 16 publications

References 48 publications

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

Fluorosilicone Composites with Functionalized Graphene Oxide for Advanced Applications

Effect of ultrasound power on HCl leaching kinetics of impurity removal of aphanitic graphite

Influence of the Electrode Deposition Method of Graphene-Based Catalyst Inks for ADEFC on Performance

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