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Issue 25, 2021, Issue in Progress
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Preparation of graphene oxide liquid crystals with long-range highly-ordered flakes using a coat-hanger die

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Abstract

Graphene oxide (GO) was discovered as a liquid crystalline (LC) phase formation in its water dispersion and expanded to a large number of applications, such as highly ordered GO sheets papers, films, and foams. However, there are still few efficient ways to prepare graphene oxide liquid crystals (GOLCs) with long-range highly ordered flakes. In this work, after carefully studying the rheological properties of GO aqueous dispersions at different concentrations, we have provided a new method to prepare holistically-oriented GOLCs through a designed coat-hanger die. Further, by simulating the extrusion process in the slot of the coat-hanger die, the die's dimensional sizes were optimized to apply efficient shear force on GO dispersions. Then, GOLCs with long-range highly ordered flakes of different GO concentrations were prepared using this method. Finally, a GO foam with a highly ordered structure was prepared using a layer-by-layer method, which exhibited improved conductivity compared to that of normal disordered GO foams after chemical reduction.

Graphical abstract: Preparation of graphene oxide liquid crystals with long-range highly-ordered flakes using a coat-hanger die

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Supplementary files

Article information


Submitted
15 Feb 2021
Accepted
04 Apr 2021
First published
22 Apr 2021

This article is Open Access

RSC Adv., 2021,11, 15085-15090
Article type
Paper

Preparation of graphene oxide liquid crystals with long-range highly-ordered flakes using a coat-hanger die

Q. Wu, H. Guo, T. Hua, L. Zhao, L. Li and B. Qian, RSC Adv., 2021, 11, 15085
DOI: 10.1039/D1RA01241J

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    [Original citation] - Published by The Royal Society of Chemistry.

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