Wang Chunhui, Gong Yan, Cunning Benjamin V, Lee Seunghwan, Le Quan, Joshi Shalik R, Buyukcakir Onur, Zhang Hanyang, Seong Won Kyung, Huang Ming, Wang Meihui, Lee Jaeseon, Kim Gun-Ho, Ruoff Rodney S
Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea.
School of Mechanical, Aerospace and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
Sci Adv. 2021 Jan 1;7(1). doi: 10.1126/sciadv.abe3767. Print 2021 Jan.
We report a versatile method to make liquid metal composites by vigorously mixing gallium (Ga) with non-metallic particles of graphene oxide (G-O), graphite, diamond, and silicon carbide that display either paste or putty-like behavior depending on the volume fraction. Unlike Ga, the putty-like mixtures can be kneaded and rolled on any surface without leaving residue. By changing temperature, these materials can be stiffened, softened, and, for the G-O-containing composite, even made porous. The gallium putty (GalP) containing reduced G-O (rG-O) has excellent electromagnetic interference shielding effectiveness. GalP with diamond filler has excellent thermal conductivity and heat transfer superior to a commercial liquid metal-based thermal paste. Composites can also be formed from eutectic alloys of Ga including Ga-In (EGaIn), Ga-Sn (EGaSn), and Ga-In-Sn (EGaInSn or Galinstan). The versatility of our approach allows a variety of fillers to be incorporated in liquid metals, potentially allowing filler-specific "fit for purpose" materials.
我们报道了一种通用方法，通过将镓（Ga）与氧化石墨烯（G-O）、石墨、金刚石和碳化硅等非金属颗粒剧烈混合来制备液态金属复合材料，这些复合材料根据体积分数呈现出糊状或类似油灰的行为。与Ga不同，类似油灰的混合物可以在任何表面上揉捏和滚动而不留下残渣。通过改变温度，这些材料可以变硬、变软，对于含G-O的复合材料，甚至可以制成多孔材料。含有还原氧化石墨烯（rG-O）的镓油灰（GalP）具有优异的电磁干扰屏蔽效能。含金刚石填料的GalP具有优异的热导率和热传递性能，优于市售的液态金属基导热膏。复合材料也可以由Ga的共晶合金形成，包括Ga-In（EGaIn）、Ga-Sn（EGaSn）和Ga-In-Sn（EGaInSn或加林斯坦合金）。我们方法的通用性允许将各种填料掺入液态金属中，有可能实现特定填料的“量身定制”材料。
