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Updated: Jun 13, 2026

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
Published on: July 17, 2019
Monodisperse chemically modified graphene obtained by density gradient ultracentrifugal rate separation
Xiaoming Sun1, Dachao Luo, Junfeng Liu
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, P.O. Box 98, Beijing 100029, China. sunxm@mail.buct.edu.cn
Abstract:
A simple density gradient ultracentrifuge separation method has been developed for sorting chemically modified graphene (CMG) by sheet size and surface chemistry in just a few minutes. By optimizing the parameters, including the density gradient and centrifugation time, CMG sheets with specific size ranges and optical properties can be targeted selectively. UV-vis absorbance and photoluminescence spectra revealed the properties of separated CMG samples are highly dependent on their sheet size and degree of oxidation. A possible mechanism for the separation is discussed.
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