Direct-Ink-writing of liquid metal-graphene-based polymer composites: Composition-processing-property relationships
Direct-Ink-writing of liquid metal-graphene-based polymer composites: Composition-processing-property relationships
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DOI：
10.1016/j.jmatprotec.2021.117470
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发表时间：
2022-04-01
影响因子：
6.3
通讯作者：
Gozen, B. Arda
中科院分区：
文献类型：
--
作者：
Tandel, Ruchira;Gozen, B. Arda
本文研究了由聚氧化乙烯、石墨烯薄片和微球状共晶镓铟(Egain)填料复合而成的溶剂型前驱体(油墨)及其直接墨写(DIW)加工。目前的研究集中在Eagain填料对油墨流变性、DIW工艺机理以及印刷结构的导电性的影响。结果表明，Eagain填料使油墨的流变性变得更有弹性，拉伸粘度更低。这导致油墨细丝能够在DIW期间承受较大的拉伸应变，即使在打印速度高于墨水流动速度的情况下也能形成连续的打印，并产生线宽小于喷嘴直径的特征。由于液体Egain填充物沿打印方向的变形，打印的导电性随着应变的增加而降低。这些发现可用于控制DIW工艺和导电聚合物复合材料的性能。
This paper presents a study of the solvent-based precursors (inks) derived from composites of polyethylene oxide, graphene flakes and micro-scale spherical Eutectic Gallium Indium (EGaIn) fillers and their processing through direct-ink-writing (DIW). The presented studies focus on the influence of EGaIn fillers on ink rheology, DIW process mechanisms as well as electrical conductivity of the printed structures. The results show that EGaIn fillers vary the ink rheology towards a more elastic behavior with lower extensional viscosity. This leads to ink filaments capable of withstanding large extensional strains during DIW, forming continuous prints even when printing speed is higher than ink flow speed, and producing features with line width smaller than the nozzle diameter. Electrical conductivity of the prints reduces with increasing strain due to the deformation of the liquid EGaIn fillers along the printing direction. These findings can be utilized to control the DIW process and the properties of the conductive polymer composites.