Scalable One‐Step Wet‐Spinning of Graphene Fibers and Yarns from Liquid Crystalline Dispersions of Graphene Oxide: Towards Multifunctional Textiles

By R. Jalili, Seyed Hamed Aboutalebi, D. Esrafilzadeh, R. Shepherd, Jun Chen, Sima Aminorroaya-Yamini, K. Konstantinov, A. Minett, J. Razal, G. Wallace. 2013

403 citations recorded by the source corpus.

Key points in the formation of liquid crystalline (LC) dispersions of graphene oxide (GO) and their processability via wet‐spinning to produce long lengths of micrometer‐dimensional fibers and yarns are addressed. Based on rheological and polarized optical microscopy investigations, a rational relation between GO sheet size and polydispersity, concentration, liquid crystallinity, and spinnability is proposed, leading to an understanding of lyotropic LC behavior and fiber spinnability. The knowledge gained from the straightforward formulation of LC GO “inks” in a range of processable concentrations enables the spinning of continuous conducting, strong, and robust fibers at concentrations as low as 0.075 wt%, eliminating the need for relatively concentrated spinning dope dispersions. The dilute LC GO dispersion is proven to be suitable for fiber spinning using a number of coagulation strategies, including non‐solvent precipitation, dispersion destabilization, ionic cross‐linking, and polyelectrolyte complexation. One‐step continuous spinning of graphene fibers and yarns is introduced for the first time by in situ spinning of LC GO in basic coagulation baths (i.e., NaOH or KOH), eliminating the need for post‐treatment processes. The thermal conductivity of these graphene fibers is found to be much higher than polycrystalline graphite and other types of 3D carbon based materials.

Subfields: Biomedical Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e0a4e14be20ddc3de5113e23e4207e8d4b602bdd

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In Biomedical Engineering

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Citations in the corpus

• Rheological properties of graphene oxide liquid crystal (2014, background): “Recently, graphene oxide (GO), an oxygenated form of graphene with spontaneous solution dispersibility, has also been reported to form discotic colloidal liquid crystalline phase in aqueous dispersion as well as in several organic solvents [11–19].”
• Synthesis, properties, and applications of graphene oxide/reduced graphene oxide and their nanocomposites (2019, background): “Other researchers modify graphite into expanded graphite by thermal treatment or exposure to strong oxidizers to increase the interlayer spacing of the carbon source, resulting in easier delamination of the graphite oxide layers [30,31].”