Metallic gels for conductive 3D and 4D printing
Metallic gels for conductive 3D and 4D printing
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DOI：
10.1016/j.matt.2023.06.015
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发表时间：
2023-07-05
期刊：
影响因子：
18.9
通讯作者：
Dickey, Michael D.
中科院分区：
文献类型：
--
作者：
Xing, Ruizhe;Yang, Jiayi;Dickey, Michael D.
本文报道了一种可印刷的金属凝胶(摆动悬浮液)，由液态低共晶镓铟合金(Egain)连接的铜颗粒的水悬浮液组成。悬浮液依靠毛细管力在固体颗粒之间形成网络，具有与组成有关的流变性，但以前的研究主要集中在绝缘悬浮液上。在这里，通过改变组成和pH来调节导电固-液-液悬浮液的流变性，以用于3D打印；后者促进金属润湿。干燥的印刷件具有金属电导率(1：053105 S/米)，不需要烧结步骤。在高温下干燥可以加速水分的去除，同时产生驱动形状变化的应力(即4D打印)。作为演示，我们打印了一个导电蜘蛛，它可以从最初平坦的形状提升并组装自己的身体。这种导电油墨有望在环境条件下打印金属结构。
This paper reports printable metallic gels (pendular suspensions) consisting of an aqueous suspension of copper particles connected by bridges of liquid eutectic gallium indium alloy (EGaIn). Pendular suspensions rely on capillary forces to form networks between solid particles with a composition-dependent rheology, but prior studies have focused on insulating suspensions. Here, the rheology of a conductive solid-liquid-liquid suspension is tuned for 3D printing by varying the composition and the pH; the latter promotes metallic wetting. The dry printed parts have metallic electrical con-ductivity (1:053105 S/m) without requiring a sintering step. Drying at elevated temperatures can accelerate the removal of water while creating stress that drives shape change (i.e., 4D printing). As a demonstration, we print a conductive spider that lifts and assembles its own body from an initially flat shape. Such conductive inks are promising for printing metallic structures under ambient conditions.