Amalgamation‐Assisted Control of Profile of Liquid Metal for the Fabrication of Microfluidic Mixer and Wearable Pressure Sensor

Hu, W.; Li, Yuxing; Tang, Shi; Li, Lin; Niu, Q. Jason; Yan, Sheng

doi:10.1002/admi.202100038

Cited by 18 publications

(21 citation statements)

References 43 publications

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“…Figure 1 a schematically illustrates the illustrations of the fabrication of soft microfluidic circuits based on the soft-lithographic method. LM was first patterned on the copper surface using the previously reported amalgamation-assisted lithographic technique [ 31 , 32 ]. To obtain the desired LM stamp, an adhesive sheet with a thickness of 200 μm was engraved by the laser to get the designed patterns and then attached to a petri dish covered with a layer of copper tape.…”

Section: Resultsmentioning

confidence: 99%

Construction of liquid metal-based soft microfluidic sensors via soft lithography

Yang

Duan

et al. 2022

J Nanobiotechnol

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Background Liquid metal (LM) can be integrated into microfluidic channel, bringing new functionalities of microfluidics and opening a new window for soft microfluidic electronics, due to the superior advantages of the conductivity and deformability of LMs. However, patterning the LMs into microfluidic channels requires either selective surface wetting or complex fabrication process. Results In this work, we develop a method to pattern the LMs onto the soft elastomer via soft lithographic process for fabrication of soft microfluidic sensors without the surface modification, bulky facilities, and complicated processes. The combination of the interfacial hydrogen bond and surface tension enables the LM patterns transfer to the soft elastomer. The transferred LM patterns with an ellipse-like cross-section further improve the stability under the mechanical deformation. Three proof-of-concept experiments were conducted to demonstrate the utilization of this method for development of thermochromic sensors, self-powered capacity sensors and flexible biosensor for glucose detection. Conclusions In summary, the proposed method offers a new patterning method to obtain soft microfluidic sensors and brings new possibilities for microfluidics-related wearable devices. Graphical Abstract

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Section: Resultsmentioning

confidence: 99%

Construction of liquid metal-based soft microfluidic sensors via soft lithography

Yang

Duan

et al. 2022

J Nanobiotechnol

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“…On the other hand, appropriate micro/nanostructures could be introduced to the sensors to achieve outstanding performance indexes such as sensitivity or stability. For example, mirco/ nanopyramids, 26 domes, 27 pores, 28 and cracks 29 are often seen in the architecture design of sensors. However, large usage of expensive metals not only increases the cost of paper-based devices but also may limit the flexibility of paper-based sensors.…”

Section: Introductionmentioning

confidence: 99%

Paper-Based Sensor with Bioinspired Macrogrooves for Dual Pressure and Mechanical Strain Signal Detection

Yao

Meng

et al. 2022

ACS Appl. Nano Mater.

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Flexible and wearable sensors are of paramount importance in applications like electronic skin, health monitoring, and human–computer interactions. However, mass production of flexible sensors with versatile, high-performance, low-cost, and easy-to-dispose features remains a huge challenge. Herein, based on a strategy of bionics inspired by the slit receptors in arthropods, a flexible paper-based sensor with macrocracks is developed. And a large number of irregular microdomes are formed on the surfaces of folded paper, which attributes to the conductive composites constructed by carbon nanomaterials and poly(dimethylsiloxane) (PDMS). Macrocracks and microdomes are helpful to achieve outstanding dual mechanical strain/pressure signal sensing functions. The materials used and the fabricating method employed are cost-efficient and convenient. As a result, the paper-based sensor exhibits a gauge factor of 64 within the strain range of 1% and excellent stability over 1500 cycles. When serving as a pressure sensor, it shows a high sensitivity of 1.4 kPa–1 in the range within 0.5 kPa. Also, the paper-based sensor shows an environmentally friendly feature and can be almost disposed of naturally, indicating that the bioinspired sensor could serve as disposable green flexible electronics, which has potential usage in wearable applications.

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“…[1,2] In order to mimic these properties of human skin, flexible electronic skin has received great attention. One of the common and representative methods to prepare the sensor is to incorporate conductive materials like liquid metals, [3] carbon nanotubes, [4,5] graphene, [6] silver nanowires [7] etc. with a nonconductive flexible polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

High strength, self‐healing, and anti‐freezing polyurethane ionogel based on multiple hydrogen bonding for wearable strain sensor

Xiao

Wang

et al. 2022

Polymer Engineering & Sci

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Hydrogel-based electronic skin sensors often suffer from low mechanical properties, poor durability, and low temperature resistance. Herein, an ionogel was fabricated by casting the water-borne polyurethane (WPU) and 1-ethyl-3-methylimidazoliumdicyanamide (EMIM:DCA). The imidazolidinyl urea with multiple hydrogen bonds as chain extenders was introduced into WPU systems. Owing to the multiple hydrogen bonds, the ionogels exhibited good mechanical properties with a tensile stress of 1.45-12.09 MPa, a strain of 730%-860%, and good resilience. Moreover, the mechanical properties, conductivity, and sensing ability of the ionogels could be conveniently healed with the assistance of heat. EMIM:DCA endowed the ionogels with excellent ionic conductivity at room temperature (1.8-246 μS cm À1 ). In addition, due to the low vapor pressure of EMIM:DCA, the ionogel exhibited excellent antifreezing property at À20 C. The ionogel can be assembled into a sensor to monitor the movements of human body with good responsiveness and stability.

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Amalgamation‐Assisted Control of Profile of Liquid Metal for the Fabrication of Microfluidic Mixer and Wearable Pressure Sensor

Cited by 18 publications

References 43 publications

Construction of liquid metal-based soft microfluidic sensors via soft lithography

Construction of liquid metal-based soft microfluidic sensors via soft lithography

Paper-Based Sensor with Bioinspired Macrogrooves for Dual Pressure and Mechanical Strain Signal Detection

High strength, self‐healing, and anti‐freezing polyurethane ionogel based on multiple hydrogen bonding for wearable strain sensor

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