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

机译:石墨烯氧化物液晶分散体中可扩展的一步法湿纺石墨烯纤维和纱线:向多功能纺织品发展

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摘要

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.
机译:解决了氧化石墨烯(GO)的液晶(LC)分散体的形成及其通过湿法纺丝生产长尺寸微米级纤维和纱线的可加工性的关键点。基于流变学和偏振光学显微镜研究,提出了GO片材尺寸与多分散性,浓度,液晶性和可纺性之间的合理关系,从而使人们对溶致LC行为和纤维可纺性有了一个了解。通过在各种可处理浓度范围内直接配制LC GO“油墨”而获得的知识使纺出浓度低至0.075 wt%的连续导电,坚固和坚固的纤维成为可能,从而消除了对浓度相对较高的纺丝原液分散液的需要。事实证明,稀薄的LC GO分散体适用于使用多种凝结策略进行纤维纺丝,包括非溶剂沉淀,分散体不稳定,离子交联和聚电解质络合。石墨烯纤维和纱线的单步连续纺纱是通过在碱性混凝槽(即NaOH或KOH)中原位纺丝LC GO引入的,这消除了对后处理工艺的需求。发现这些石墨烯纤维的热导率远高于多晶石墨和其他类型的3D碳基材料。

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