Amalgamation‐Assisted Control of Profile of Liquid Metal for the Fabrication of Microfluidic Mixer and Wearable Pressure Sensor. Issue 10 (7th March 2021)

• Record Type: Journal Article
• Authors: Hu, Weiping; Li, Yuxing; Tang, Shi‐Yang; Li, Lin; Niu, Q. Jason; Yan, Sheng
• Is Part Of: Advanced materials interfaces. Volume 8:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-03-07
• Subjects: liquid metals -- microdomes -- microfluidics -- wearable sensors; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202100038
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: The presence of microdomes can significantly increase the surface roughness, contact area, and deformability of materials, which have been adopted in many fields including microfluidics, wearable devices, and microanalysis systems. However, the shape of liquid metal (LM) droplet is defined by the density and surface energy, which has very limited room to tune. In this work, a simple, low‐cost method to effectively control the profile of LM using the masked amalgamation is presented. The LM amalgamates the masked copper surface to create the complex microdomes with various aspect ratios, sizes, profiles, and structures. The concave dome replicated from the LM mold has been demonstrated to enhance the microfluidic mixing performance. With a pattern transfer technique, the microconvex domes can be patterned on the surface of stretchable conductive composites to develop a flexible and sensitive pressure sensor. This sensor exhibits a fast response time, a wide working range, and an enhanced sensitivity for detecting small strains. As such, the fabricated microdomes exhibit a great potential to enable the fabrication of high‐performance sensors, microfluidic platforms, and micro total analysis systems. Abstract : This paper presents a simple and straightforward amalgamation‐assisted method for creating liquid metal droplets and microdomes with highly controllable sizes. The microdome can generate the vortices, enhancing the flow mixing inside the microfluidic channel. Besides, the microdomes are patterned on the surface of stretchable conductive composites to develop a flexible and sensitive pressure sensor.