Metallophobic Coatings to Enable Shape Reconfigurable Liquid Metal Inside 3D Printed Plastics
- 25 November 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 13 (11), 12709-12718
- https://doi.org/10.1021/acsami.0c17283
Abstract
Liquid metals adhere to most surfaces despite their high surface tension due to the presence of a native gallium oxide layer. The ability to change the shape of functional fluids within a three-dimensional (3D) printed part with respect to time is a type of four-dimensional printing, yet surface adhesion limits the ability to pump liquid metals in and out of cavities and channels without leaving residue. Rough surfaces prevent adhesion, but most methods to roughen surfaces are difficult or impossible to apply on the interior of parts. Here, we show that silica particles suspended in an appropriate solvent can be injected inside cavities to coat the walls. This technique creates a transparent, nanoscopically rough (10–100 nm scale) coating that prevents adhesion of liquid metals on various 3D printed plastics and commercial polymers. Liquid metals roll and even bounce off treated surfaces (the latter occurs even when dropped from heights as high as 70 cm). Moreover, the coating can be removed locally by laser ablation to create selective wetting regions for metal patterning on the exterior of plastics. To demonstrate the utility of the coating, liquid metals were dynamically actuated inside a 3D printed channel or chamber without pinning the oxide, thereby demonstrating electrical circuits that can be reconfigured repeatably.Funding Information
- Army Research Office (W911NF-17-1-0216)
- Ministry of Trade, Industry and Energy (1415168877)
- Korea Evaluation Institute of Industrial Technology
- National Science Foundation
This publication has 57 references indexed in Scilit:
- Overcoming Rayleigh–Plateau instabilities: Stabilizing and destabilizing liquid-metal streams via electrochemical oxidationProceedings of the National Academy of Sciences of the United States of America, 2020
- Exploring Electrochemical Extrusion of Wires from Liquid MetalsACS Applied Materials & Interfaces, 2020
- Directed Assembly of Liquid Metal-Elastomer Conductors for Stretchable and Self-Healing ElectronicsAdvanced Materials, 2020
- Nanofabrication for all-soft and high-density electronic devices based on liquid metalNature Communications, 2020
- Materials tactile logic via innervated soft thermochromic elastomersNature Communications, 2019
- Mechanoresponsive Polymerized Liquid Metal NetworksAdvanced Materials, 2019
- Laser Sintering of Liquid Metal Nanoparticles for Scalable Manufacturing of Soft and Flexible ElectronicsACS Applied Materials & Interfaces, 2018
- An autonomously electrically self-healing liquid metal-elastomer composite for robust soft-matter robotics and electronicsNature Materials, 2018
- Soft Multifunctional Composites and Emulsions with Liquid MetalsAdvanced Materials, 2017
- Stretchable and Soft Electronics using Liquid MetalsAdvanced Materials, 2017