4.8 Article

Universal Alignment of Graphene Oxide in Suspensions and Fibers

Journal

ACS NANO
Volume 15, Issue 8, Pages 13453-13462

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c03954

Keywords

graphene oxide; liquid crystal; shear; alignment; rheo-SAXS

Funding

  1. National Research Foundation of Korea (NRF) - Korea Government [NRF-2016M3A7B4905624, NRF-2018R1A5A1024127, NRF-2021R1A2C2007339]
  2. PAL
  3. National Research Foundation of Korea [PAL-2021] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Research showed that there is a universal shear threshold for the best alignment of graphene oxide particles under shear conditions, leading to a significant enhancement in the mechanical properties of graphene fibers without the need for chemical modification.
Graphene oxide (GO) has become a key component for high-performance carbon-based films or fibers based on its dispersibility and liquid crystallinity in an aqueous suspension. While the superior performance of GO-based fiber relies on their alignment at the submicrometer level, fine control of the microstructure is often hampered, in particular, under dynamic nature of GO-processing involving shear. Here, we systemically studied the structural variation of GO suspensions under shear conditions via in situ rheo-scattering and shear-polarized optical microscope analysis. The evolution of GO alignment under shear is indeed complex. However, we found that the shear-dependent structural equilibrium exists. GO showed a nonlinear structural transition with shear, yet there is a universal shear threshold for the best alignment, resulting in graphene fiber achieved an improvement in mechanical properties by similar to 54% without any chemical modification. This finding challenges the conventional concept that high shear stress is required for the good alignment of particles and their best performance.

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