Abstract：
This paper presents a scalable and straightforward technique for the immediate patterning of liquid metal/polymer composites via multiphase 3D printing. Capitalizing on the polymer\'s capacity to confine liquid metal (LM) into diverse patterns. The interplay between distinctive fluidic properties of liquid metal and its self-passivating oxide layer within an oxidative environment ensures a resilient interface with the polymer matrix. This study introduces an inventive approach for achieving versatile patterns in eutectic gallium indium (EGaIn), a gallium alloy. The efficacy of pattern formation hinges on nozzle\'s design and internal geometry, which govern multiphase interaction. The interplay between EGaIn and polymer within the nozzle channels, regulated by variables such as traverse speed and material flow pressure, leads to periodic patterns. These patterns, when encapsulated within a dielectric polymer polyvinyl alcohol (PVA), exhibit an augmented inherent capacitance in capacitor assemblies. This discovery not only unveils the potential for cost-effective and highly sensitive capacitive pressure sensors but also underscores prospective applications of these novel patterns in precise motion detection, including heart rate monitoring, and comprehensive analysis of gait profiles. The amalgamation of advanced materials and intricate patterning techniques presents a transformative prospect in the domains of wearable sensing and comprehensive human motion analysis.
摘要：
本文提出了一种可扩展且直接的技术，用于通过多相3D打印对液态金属/聚合物复合材料进行即时图案化。利用聚合物将液态金属(LM)限制在不同模式中的能力。液态金属的独特流体性质与其在氧化环境内的自钝化氧化物层之间的相互作用确保了与聚合物基质的弹性界面。这项研究介绍了一种创造性的方法，用于实现共晶镓铟（EGaIn）的通用图案，镓合金。图案形成的功效取决于喷嘴的设计和内部几何形状，控制多相相互作用。喷嘴通道内的EGaIn和聚合物之间的相互作用，由横向速度和材料流动压力等变量调节，导致周期性模式。这些模式，当封装在介电聚合物聚乙烯醇(PVA)内时，在电容器组件中表现出增强的固有电容。这一发现不仅揭示了具有成本效益和高灵敏度的电容式压力传感器的潜力，而且还强调了这些新颖模式在精确运动检测中的潜在应用。包括心率监测,和步态概况的综合分析。先进材料和复杂图案技术的融合在可穿戴传感和全面的人体运动分析领域提出了变革性的前景。
