New insights into oxygen surface coverage and the resulting two-component structure of graphene oxide

Martı́n-Gullón, Ignacio; Pérez, Juana M.; Domene, Daniel; Salgado-Casanova, Anibal J.A.; Radović, Ljubiša R.

doi:10.1016/j.carbon.2019.11.003

Cited by 13 publications

(15 citation statements)

References 94 publications

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“…In this section we attempt to provide a brief overview over the most up to date concepts and try to collect the combined knowledge of various fields into a unifying concept that may be applied for different purposes such as the oxidation of HOPG up to the oxidative unzipping of carbon nanotubes as proposed by Radovic et al in their recent works. [14,[196][197][198]…”

Section: Fundamental Reaction Steps From a Chemical Point Of Viewmentioning

confidence: 99%

“…Carbon oxidation typically follows successive crucial reaction steps (Figure 10). [116,124,126,198,199] (i) Diffusion of oxygen to the carbon surface through the boundary layer (including pore diffusion, see chapter 5). (ii) Adsorption of oxygen atoms onto the surface (see chapter 5) (iii) Splitting of dioxygen and successive reaction steps forming the primary product CO or CO 2 (discussed in this chapter) (iv) Desorption of primary products from the surface (see chapter 5) (v) Diffusion through the boundary layer of CO/CO 2 (see chapter…”

Section: Reaction Stepsmentioning

confidence: 99%

“…published several articles over the last 2 decades revealing both by calculations and experimentally mechanistic details on carbon combustion and trying to combine the consequences arising from various studies of surface complexes and RSA [208,210,218,226,227] . The understanding of what is a defect and how does this defect contribute to chemical reactivity is a central aspect not only for carbon combustion but also in the ongoing quest of understanding reactivity of novel nanocarbon allotropes [49,196,198,208,228–230] . Carbon edges in sp 2 carbon lattices can be either armchair or zig‐zag, the latter being the more reactive one in general [71,231] .…”

Section: Fundamental Reaction Steps From a Chemical Point Of Viewmentioning

confidence: 99%

See 2 more Smart Citations

An Introduction to the Combustion of Carbon Materials

Picheau

Amar

Derré

et al. 2022

Chemistry A European J

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Combustion is arguably as old as homo sapiens ability to observe and use fire. Despite the long tradition of using carbon combustion for energy production, this reaction is still not fully understood. This can be related to several facts that are intertwined and complicate the investigation, such as the large variety of possible carbon structures, the actual surface structure, porosity, the solid-gas nature of this reaction, diffusion limitation and fundamental reaction steps. In this review, a brief history of carbon combustion science is given, followed by a detailed discussion of the most important aspects of carbon combustion. Special attention is given to limitations for example diffusion. In carbon combustion, kinetic control can rarely be observed. The literature of the fundamental reaction steps actually occurring on the carbon framework is reviewed and it becomes apparent that the reaction is occurring primarily on defects on the basal plane. Thus, the reaction between oxygen and carbon may be used as an analytical tool to provide further insights into novel materials, for example synthetic carbon materials, fibres and graphene type materials. Mastering the combustion reaction in all its complexity may prove to be very valuable in the future.

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Section: Fundamental Reaction Steps From a Chemical Point Of Viewmentioning

confidence: 99%

Section: Reaction Stepsmentioning

confidence: 99%

Section: Fundamental Reaction Steps From a Chemical Point Of Viewmentioning

confidence: 99%

See 1 more Smart Citation

An Introduction to the Combustion of Carbon Materials

Picheau

Amar

Derré

et al. 2022

Chemistry A European J

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“…GO was synthesized from powdered flake graphite using the Hummers and Offeman method. 19 Sulfuric acid was placed into a beaker and stirred in an ice−bath. The powdered flake graphite and sodium nitrate were slowly added into the beaker to form a suspension.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…GO was synthesized from powdered flake graphite using the Hummers and Offeman method . Sulfuric acid was placed into a beaker and stirred in an ice–bath.…”

Section: Experimental Sectionmentioning

confidence: 99%

Graphene Oxide/Chitosan/Hydroxyapatite Composite Membranes Enhance Osteoblast Adhesion and Guided Bone Regeneration

Liu

Wang

et al. 2021

ACS Appl. Bio Mater.

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Two-dimensional materials provide a secluded space for bone formation and preserve the growth of surrounding tissues, thus playing a crucial role in guided bone regeneration (GBR). Graphene oxide (GO) has been widely employed in GBR due to its good mechanical and hydrophilic properties. A single GO membrane, however, does not provide a friendly environment for osteogenic cell adhesion. With their adjustable mechanical properties and excellent biocompatibility, composite membranes can simulate the multicomponent structure of an extracellular matrix for cell adhesion. To obtain two-dimensional membranes with appropriate mechanical strength and sufficient biocompatibility, GO-based composite membranes simultaneously containing chitosan (CS) and hydroxyapatite (HAP) were first prepared using one-step vacuum filtration and a biomimetic mineralization method. CS and HAP improved the mechanical strength and surface hydrophilicity of the membranes. In addition, moderate addition of HAP enhanced the adhesion, differentiation, and mineralization of osteoblasts. The prepared composite membranes were then implanted into a calvarial defect model to evaluate their osteogenic induction effects in vivo. Microcomputed tomography observation and histological analysis indicate that GO/CS/HAP composite membranes can accelerate bone regeneration without the contribution of endogenous cytokines. GO/CS/HAP composite membranes with unique biomimetic porous structures, superior mechanical properties, and excellent bone regeneration capacity are potential materials for application in GBR.

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Tuning the Interlayer Distance of Graphene Oxide as a Function of the Oxidation Degree for o‐Toluidine Removal

Pargoletti

Scavini

Santangelo

et al. 2023

Adv Materials Inter

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Graphene oxide (GO) with different oxidation degrees is prepared by a modified Hummers' method varying KMnO 4 amount from 0.5 to 6.0 g. X-ray powder diffraction (XRPD), micro-Raman, thermogravimetric analysis, X-ray photoeelectron spectroscopy, Boehm titrations, high-resolution transmission electron microscopy, and, finally, positron annihilation lifetime spectroscopy (PALS) are exploited to assess the properties of GO. Results show that increasing oxidant species can tune the interlayer gap between GO sheets up to a maximum value in the case of 4.0 g KMnO 4 content. Moreover, these results validate the two-component-based model of GO in which, at low oxidation degree, there are unsplit/isolated graphene planes, instead at higher oxidant amounts, a five-layer sandwiched configuration occurs comprising graphene planes having functional groups decorating the edges (bwGO), hydrated oxidative debris (OD) and "empty" spaces (revealed by PALS as the distance between (bwGO + OD) two-component layers). In addition, by XRPD analysis, the total gap between two sheets is easily computed. In order to correlate these findings to pollutant removal capability, planar o-toluidine adsorption is studied. Since this molecule diffuses in an aqueous environment, the obtained adsorption percentages are compared to the thickness of the hydrated OD grafted onto bwGO. A strict connection between the pollutant removal efficacy and the variation of the hydrated interlayer distance is found.

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New insights into oxygen surface coverage and the resulting two-component structure of graphene oxide

Cited by 13 publications

References 94 publications

An Introduction to the Combustion of Carbon Materials

An Introduction to the Combustion of Carbon Materials

Graphene Oxide/Chitosan/Hydroxyapatite Composite Membranes Enhance Osteoblast Adhesion and Guided Bone Regeneration

Tuning the Interlayer Distance of Graphene Oxide as a Function of the Oxidation Degree for o‐Toluidine Removal

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