Preparation of graphene nanosheets by shear-assisted supercritical CO 2 exfoliation

Li, Lei; Xu, Jingcheng; Li, Genghui; Jia, Xilai; Li, Yongfeng; Yang, Fan; Zhang, Liqiang; Chen, Xu; Gao, Jinsen; Liu, Yi; ZhaoWei, Fang

doi:10.1016/j.cej.2015.08.077

Cited by 98 publications

(72 citation statements)

References 37 publications

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“…Copyright 2002, American Association for the Advancement of Science. Schematic of b) experimental device, producing shearing to supercritical CO 2 fluid (Reproduced with permission . Copyright 2016, Elsevier.)…”

Section: Techniques For Intercalation and Exfoliation Of Graphitementioning

confidence: 99%

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Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Shi

Araby

Gibson

et al. 2018

Adv Funct Materials

200

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Graphene oxide is extensively compounded with polymers toward a wide variety of applications. Less studied are few-layer or multi-layer highly crystalline graphene, both of which are herein named as graphene platelets. This article aims to provide the most recent advancements of graphene platelets and their polymer composites. A first focus lies on cost-effective fabrication strategies of graphene platelets -intercalation and exfoliation -which work in a relative mass scale, e.g., 5.3 g h −1 . As no heavy oxidization is involved, the platelets have high crystalline integrity, e.g., C:O ratio over 8.0, with thicknesses 2-4 nm and lateral dimension up to a few micrometers. Through carefully selecting the solvent for dispersion and the molecules for surface modification, graphene platelets can be liquid-processable, enabling them to be printed, coated, or compounded with various polymers. A purposedesigned experiment is undertaken to unravel the effect of reasonable ultrasonication time on the platelet thickness. Typical polymer/graphene platelet composites are critically examined for their preparation, structure, and applications such as thermal management and flexible/stretchable electronic devices. Perspectives on the limitations, current challenges, and future prospects for graphene platelets and their polymer composites are provided.

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Section: Techniques For Intercalation and Exfoliation Of Graphitementioning

confidence: 99%

“…Recently, stirring was applied to CO 2 SCF by adding a propeller inside the reactor, as schematically shown in Figure b, which was designed to enhance intercalation and exfoliation . Graphite was transferred into the reactor and then CO 2 was cooled into liquid and pumped into the reactor.…”

Section: Techniques For Intercalation and Exfoliation Of Graphitementioning

confidence: 99%

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Shi

Araby

Gibson

et al. 2018

Adv Funct Materials

200

View full text Add to dashboard Cite

show abstract

“…[12][13][14][15][16][17][18][19][20][21][22] In constructing graphene structures, scCO 2 has only recently been proposed as ap lausible medium for exfoliation and drying. [23][24][25][26] In as tep forward, the methodd evelopedi n this work is devoted to the formulation of stable 3D GO aerogel structures by direct self-assembly of dispersed GO sheets in ethanol in only one step, using exclusively low-temperature scCO 2 technology and avoiding the use of any cross-linking agent. The developed scCO 2 process is optimizedf or different experimental parameters, such as temperature and CO 2 flow.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Graphene Oxide Aerogels: Exploring the Limits of Supercritical CO₂ Fabrication Methods

Borrás

Gonçalves

Marbán

et al. 2018

Chemistry A European J

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The supercritical carbon dioxide (scCO ) synthesis of non-reduced graphene oxide (GO) aerogels from dispersions of GO in ethanol is here reported as a low-cost, efficient, and environmentally friendly process. The preparation is carried out under the mild conditions of 333 K and 20 MPa. The high aspect ratio of the used GO sheets (ca. 30 μm lateral dimensions) allowed the preparation of aerogel monoliths by simultaneous scCO gelation and drying. Solid-state characterization results indicate that a thermally-stable mesoporous non-reduced GO aerogel was obtained by using the supercritical procedure, keeping most of the surface oxygenated groups on the GO sheets, thus, facilitating further functionalization. Moreover, the monoliths have a very low density, high specific surface area, and excellent mechanical integrity; characteristics which rival those of most light-weight reduced graphene aerogels reported in the literature.

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“…Die D-Linie (1347 cm -1 ) entsteht infolge der Defektbildung, die G-Linie (1586 cm -1 ) entspricht der ordentlichen Struktur von Graphit bzw. Dies kann mit einer erhöhten Konzentration von Defekten erklärt werden [9,10]. Das Intensitätsverhältnis I(D)/I(G) aller präsentierten Spektren beträgt ungefähr 1.…”

Section: Introductionunclassified

Production of Multilayer Graphene in a Vibratory Disk Mill

Trüe

Aman

Müller

et al. 2018

Chemie Ingenieur Technik

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Optimale Prozessbedingungen für das mikromechanische Abblättern von mehrschichtigem Graphen werden mit einer Scheibenschwingmühle realisiert, in der eine hochviskose Flüssigkeit bestehend aus Zucker und Graphitpartikeln zerkleinert wird. Die Bedingungen, bei denen die Scherkräfte im Prozess in der Scheibenschwingmühle entstehen, werden untersucht. Graphenblätter mit Schichtdicken von 2 -10 Schichten werden gewonnen. Das erhaltene mehrschichtige Graphen kann bei der Herstellung von Lithium-Ionen-Akkumulatoren eingesetzt werden.Optimal process conditions for the delamination of multilayer graphene are realized with a vibratory disk mill, in which a highly viscous liquid consisting of sugar and graphite particles is comminuted. The conditions are investigated, in which shear forces are generated in the process in the vibratory disk mill. Graphene sheets with layer thicknesses of 2 -10 layers are obtained. The multilayer graphene can be used in the production of lithium-ion accumulators.

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Preparation of graphene nanosheets by shear-assisted supercritical CO 2 exfoliation

Cited by 98 publications

References 37 publications

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Preparation and Characterization of Graphene Oxide Aerogels: Exploring the Limits of Supercritical CO₂ Fabrication Methods

Production of Multilayer Graphene in a Vibratory Disk Mill

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Preparation of graphene nanosheets by shear-assisted supercritical CO 2 exfoliation

Cited by 98 publications

References 37 publications

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Graphene Platelets and Their Polymer Composites: Fabrication, Structure, Properties, and Applications

Preparation and Characterization of Graphene Oxide Aerogels: Exploring the Limits of Supercritical CO2 Fabrication Methods

Production of Multilayer Graphene in a Vibratory Disk Mill

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Product

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Preparation and Characterization of Graphene Oxide Aerogels: Exploring the Limits of Supercritical CO₂ Fabrication Methods