High shear-induced exfoliation of graphite into high quality graphene by Taylor–Couette flow

Tran, Tuan Sang; Park, Seung Jun; Yoo, Seung‐Hwan; Lee, Tae-Rin; Kim, Tae Young

doi:10.1039/c5ra22273g

Cited by 90 publications

(55 citation statements)

References 24 publications

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“…Apart from the rotor–stator mixer, a Taylor–Couette flow reactor was applied to generate turbulence to exfoliate graphite . The reactor consisted of two concentric cylinders.…”

Section: Techniques Utilized For Graphene Exfoliation and Dispersionmentioning

confidence: 99%

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

Shi

Araby

Gibson

et al. 2018

Adv Funct Materials

208

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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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“…Apart from the rotor–stator mixer, a Taylor–Couette flow reactor was applied to generate turbulence to exfoliate graphite . The reactor consisted of two concentric cylinders.…”

Section: Techniques Utilized For Graphene Exfoliation and Dispersionmentioning

confidence: 99%

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

Shi

Araby

Gibson

et al. 2018

Adv Funct Materials

208

View full text Add to dashboard Cite

show abstract

“…Among the method for the production of graphene, liquid phase exfoliation (LPE) is a top‐down approach, which allows the bulk pristine graphite to be exfoliated into graphene in a liquid environment. This process is performed by exploiting ultrasound or shear forces to break the van der Waals bond between the adjacent planes of the graphite . The possibility to produce graphene in a liquid phase allows functional inks with on‐demand rheological and morphological properties to be formulated .…”

Section: Introductionmentioning

confidence: 99%

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

Bellani

Petroni

Castillo

et al. 2019

Adv Funct Materials

204

165

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The miniaturization of energy storage units is pivotal for the development of next-generation portable electronic devices. Micro-supercapacitors (MSCs) hold great potential to work as on-chip micro-power sources and energy storage units complementing batteries and energy harvester systems. Scalable production of supercapacitor materials with costeffective and high-throughput processing methods is crucial for the widespread application of MSCs. Here, wet-jet milling exfoliation of graphite is reported to scale up the production of graphene as a supercapacitor material. The formulation of aqueous/alcohol-based graphene inks allows metal-free, flexible MSCs to be screen-printed. These MSCs exhibit areal capacitance (C areal ) values up to 1.324 mF cm −2 (5.296 mF cm −2 for a single electrode), corresponding to an outstanding volumetric capacitance (C vol ) of 0. 490 F cm −3 (1.961 F cm −3 for a single electrode). The screen-printed MSCs can operate up to a power density above 20 mW cm −2 at an energy density of 0.064 µWh cm −2 . The devices exhibit excellent cycling stability over chargedischarge cycling (10 000 cycles), bending cycling (100 cycles at a bending radius of 1 cm) and folding (up to angles of 180°). Moreover, ethylene vinyl acetate-encapsulated MSCs retain their electrochemical properties after a home-laundry cycle, providing waterproof and washable properties for prospective application in wearable electronics.

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“…Additionally, a strong C-C carbon peak is observed at 285.0 eV for S1 which may compromise the graphene quality itself [37]. On the other hand, an intense sp 2 carbon peak near 284.5 eV is observed for S2, which indicates fewer layer of graphene for sample S2.…”

Section: Resultsmentioning

confidence: 98%

Controlled Cu nanoparticle growth on wrinkle affecting deposition of large scale graphene

Ahmed

Uddin

Rahman

et al. 2016

Journal of Crystal Growth

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High shear-induced exfoliation of graphite into high quality graphene by Taylor–Couette flow

Abstract: A scalable method to produce high-quality graphene by shear-exfoliation of graphite is presented. High shear mixing of graphite in the Taylor vortex flow regime allows for the bulk production of few-layer graphene with low content of defects.

Cited by 90 publications

References 24 publications

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

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

Scalable Production of Graphene Inks via Wet‐Jet Milling Exfoliation for Screen‐Printed Micro‐Supercapacitors

Controlled Cu nanoparticle growth on wrinkle affecting deposition of large scale graphene

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