Liquid metal embedded real time microfluidic flow pressure monitoring sensor

Peng, Kelu; Yao, Junyi; Cho, Sunghyun; Cho, Younghak; Kim, Hyun Soo; Park, Jaewon

doi:10.1016/j.sna.2020.111909

Cited by 8 publications

(8 citation statements)

References 21 publications

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“…When the temperature of the sensor increased from 20 °C to 40 °C, the resistance value varied by less than 1%, indicating good temperature stability. [64] Sensors based on nanoscale cracks are sensitive to low strain and could be useful in diverse applications requiring ultrahigh displacement sensitivity. [65] By artificially adding non-penetrating cracks on brittle sensing materials, those structures reach a high level of sensitivity.…”

Section: Lm Resistive Sensorsmentioning

confidence: 99%

“…[27b] Liu et al embedded EGaIn droplets into TPU fiber and prepared LM/TPU fiber substrates with a hierarchically porous structure using a combination of wet-spinning and dip-coating processes. In addition, a flexible and elastic fiber-based strain [59a] with high aspect ratio channels, [64] high aspect ratio, stacked channels, [63] and channels with microbumps. [67] b) Strain sensors without a high-sensitivity structure [33] and with cracked structures.…”

Section: Lm Resistive Sensorsmentioning

confidence: 99%

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Emerging Advances of Liquid Metal toward Flexible Sensors

Qin

Cui

Ren

et al. 2023

Adv Materials Technologies

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With the rising demand for biosignal detection, many wearable sensors emerge in recent years. Such a new generation of sensors relies on major breakthroughs in soft sensing materials, which can be bent, compressed, and stretched in a large range. Ga‐based liquid metals (LM) offer a unique combination of high deformability, electrical conductivity, and biocompatibility, making them ideal functional candidate materials for wearable sensors. Numerous studies design various LM sensors for detecting and modulating diverse signals. Nevertheless, further systematic discussion is still missing regarding their operational mechanism, structure defects, and potential solutions. In this review, recent progress in the application of Ga‐based LM sensors is summarized and discussed, with a focus on the sensing principles corresponding to distinct LM properties, the problems, and solutions to each type of sensor. The key challenges toward biosignal detection and future research orientations are discussed.

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Section: Lm Resistive Sensorsmentioning

confidence: 99%

Section: Lm Resistive Sensorsmentioning

confidence: 99%

Emerging Advances of Liquid Metal toward Flexible Sensors

Qin

Cui

Ren

et al. 2023

Adv Materials Technologies

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“…23)) and large surface tension make it possible to use LM as microelectrodes. 24 Such microuidic chips with LM as electrodes have been widely used in various elds such as micropumps, 11,25,26 heaters, 27,28 sensors, [29][30][31] antennas, 32,33 etc.…”

Section: Introductionmentioning

confidence: 99%

Texture-structure-based liquid metal filling for blind-end microchannels and its application on multi-layer chips

Zhang

et al. 2023

RSC Adv.

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“…While precise, such devices require a tedious multi-layer fabrication. In 2020, Peng et al measured a deformationinduced resistivity change in a membrane separating a main flow channel from two ionic electrodes [12]. Although effective, such devices induce very small changes in resistivity over large changes in pressure, sacrificing detection precision for a larger measurable pressure range.…”

Section: Introductionmentioning

confidence: 99%

Piezoresistive Conductive Microfluidic Membranes for Low-Cost On-Chip Pressure and Flow Sensing

Islam

Doria

et al. 2022

Sensors

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Over the last two decades, the field of microfluidics has received significant attention from both academia and industry. Each year, researchers report thousands of new prototype devices for use in a broad range of environmental, pharmaceutical, and biomedical engineering applications. While lab-on-a-chip fabrication costs have continued to decrease, the hardware required for monitoring fluid flows within the microfluidic devices themselves remains expensive and often cost-prohibitive for researchers interested in starting a microfluidics project. As microfluidic devices become capable of handling complex fluidic systems, low-cost, precise, and real-time pressure and flow rate measurement capabilities have become increasingly important. While many labs use commercial platforms and sensors, these solutions can often cost thousands of dollars and can be too bulky for on-chip use. Here we present a new inexpensive and easy-to-use piezoresistive pressure and flow sensor that can be easily integrated into existing on-chip microfluidic channels. The sensor consists of PDMS–carbon black conductive membranes and uses an impedance analyzer to measure impedance changes due to fluid pressure. The sensor costs several orders of magnitude less than existing commercial platforms and can monitor local fluid pressures and calculate flow rates based on the pressure gradient.

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Liquid metal embedded real time microfluidic flow pressure monitoring sensor

Cited by 8 publications

References 21 publications

Emerging Advances of Liquid Metal toward Flexible Sensors

Emerging Advances of Liquid Metal toward Flexible Sensors

Texture-structure-based liquid metal filling for blind-end microchannels and its application on multi-layer chips

Piezoresistive Conductive Microfluidic Membranes for Low-Cost On-Chip Pressure and Flow Sensing

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