High-Throughput Continuous Production of Shear-Exfoliated 2D Layered Materials using Compressible Flows

Rizvi, R, Nguyen, E, Kowal, M and Wai H. Mak, et al, 2018, 'High-Throughput Continuous Production of Shear-Exfoliated 2D Layered Materials using Compressible Flows', Advanced Materials, vol. 30, no. 30, pp. 1-11.


Document type: Journal Article
Collection: Journal Articles

Title High-Throughput Continuous Production of Shear-Exfoliated 2D Layered Materials using Compressible Flows
Author(s) Rizvi, R
Nguyen, E
Kowal, M
Wai H. Mak, et al,
Year 2018
Journal name Advanced Materials
Volume number 30
Issue number 30
Start page 1
End page 11
Total pages 11
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Abstract 2D nanomaterials are finding numerous applications in next-generation electronics, consumer goods, energy generation and storage, and healthcare. The rapid rise of utility and applications for 2D nanomaterials necessitates developing means for their mass production. This study details a new compressible flow exfoliation method for producing 2D nanomaterials using a multiphase flow of 2D layered materials suspended in a high-pressure gas undergoing expansion. The expanded gassolid mixture is sprayed in a suitable solvent, where a significant portion (up to 10% yield) of the initial hexagonal boron nitride material is found to be exfoliated with a mean thickness of 4.2 nm. The exfoliation is attributed to the high shear rates ((Formula presented.) > 105 s−1) generated by supersonic flow of compressible gases inside narrow orifices and converging-diverging channels. This method has significant advantages over current 2D material exfoliation methods, such as chemical intercalation and exfoliation, as well as liquid phase shear exfoliation, with the most obvious benefit being the fast, continuous nature of the process. Other advantages include environmentally friendly processing, reduced occurrence of defects, and the versatility to be applied to any 2D layered material using any gaseous medium. Scaling this process to industrial production has a strong possibility of reducing the cost of creating 2D nanomaterials. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Subject Electrical and Electronic Engineering not elsewhere classified
Keyword(s) 2D materials
boron nitride
compressible flow
exfoliation
graphene
DOI - identifier 10.1002/adma.201800200
Copyright notice © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN 0935-9648
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