Soft metal constructs for large strain sensor membrane

Michaud, Hadrien O.; Teixidor, Joan; Lacour, Stéphanie

doi:10.1088/0964-1726/24/3/035020

Cited by 21 publications

(20 citation statements)

References 44 publications

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“…This is mainly due to the viscoelastic effect of the base polymer. Such hysteresis has been previously reported in soft microfluidic sensors [14,24,33] and also in our sensor samples, as shown in figure 8, since the viscoelasticicty of the polymer causes a time delay for the conductive fluid to physically move in the microchannel even after the release of deformation (i.e. pressure).…”

Section: Hysteresis Analysissupporting

confidence: 83%

Enhanced performance of microfluidic soft pressure sensors with embedded solid microspheres

Shin

Ryu

Majidi

et al. 2016

J. Micromech. Microeng.

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The cross-sectional geometry of an embedded microchannel influences the electromechanical response of a soft microfluidic sensor to applied surface pressure. When a pressure is exerted on the surface of the sensor deforming the soft structure, the cross-sectional area of the embedded channel filled with a conductive fluid decreases, increasing the channel's electrical resistance. This electromechanical coupling can be tuned by adding solid microspheres into the channel. In order to determine the influence of microspheres, we use both analytic and computational methods to predict the pressure responses of soft microfluidic sensors with two different channel cross-sections: a square and an equilateral triangular. The analytical models were derived from contact mechanics in which microspheres were regarded as spherical indenters, and finite element analysis (FEA) was used for simulation. For experimental validation, sensor samples with the two different channel cross-sections were prepared and tested. For comparison, the sensor samples were tested both with and without microspheres. All three results from the analytical models, the FEA simulations, and the experiments showed reasonable agreement confirming that the multi-material soft structure significantly improved its pressure response in terms of both linearity and sensitivity. The embedded solid particles enhanced the performance of soft sensors while maintaining their flexible and stretchable mechanical characteristic. We also provide analytical and experimental analyses of hysteresis of microfluidic soft sensors considering a resistive force to the shape recovery of the polymer structure by the embedded viscous fluid.

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Section: Hysteresis Analysissupporting

confidence: 83%

Enhanced performance of microfluidic soft pressure sensors with embedded solid microspheres

Shin

Ryu

Majidi

et al. 2016

J. Micromech. Microeng.

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“…Gallium‐based alloys are readily present in a spectrum of applications as stretchable conductors: soft interconnects of a CMOS chip, stretchable interconnects for flexible electronics on plastic, stretchable printed circuit boards, and conductive fibers . Other alternative uses of eGaIn conductors include strain sensors, soft actuators, and soft antennas . With a maximum strain reaching 800% and a fatigue‐free operation after a million loading cycles, gallium‐based stretchable conductors are mechanically superior to their solid alternatives .…”

Section: Electrical Properties Of the Fabricated Mr Receive Coilsmentioning

confidence: 99%

Adsorbed Eutectic GaIn Structures on a Neoprene Foam for Stretchable MRI Coils

et al. 2017

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Stretchable conductors based on eutectic gallium-indium (eGaIn) alloy are patterned on a polychloroprene substrate (neoprene foam) using stencil printing. By tuning the amount of eGaIn on the neoprene substrate, different strain-sensitivity of electrical resistance is achieved. Conductors with a layer of eGaIn, which adsorbs to the walls of 60-100 µm wide neoprene cells, change their electrical resistance for 5% at 100% strain. When the amount of eGaIn is increased, the cells are filled with eGaIn and the strain-sensitivity of the electrical resistance rises to 300% at 100% strain. The developed conductors are patterned as stretchable on-body coils for receiving magnetic signals in a clinical magnetic resonance imaging setup. First images with a stretchable coil are acquired on an orange and compared to the images that are recorded using a rigid copper coil of the same size.

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“…Soft liquid metal micro-wires embedded in silicone have small resistance at rest (less than 1 for centimeterlong wires) and their resistance increases by less than 150% for strains up to 50% [11]. These characteristics were ideal for building a stretchable interconnects network.…”

Section: Design Of Sensors and Soft Interconnectsmentioning

confidence: 99%

Soft flexion sensors integrating strechable metal conductors on a silicone substrate for smart glove applications

Michaud

Teixidor

Lacour

2015

2015 28th IEEE International Conference on Micro Electro Mechanical Systems (MEMS)

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We design and implement a sensory skin that monitors in real time finger flexure (three sensors per finger) of a user's hand.Compared to current technologies, the electronic skin is made entirely of stretchable materials integrating silicone rubber, low resistivity liquid metal interconnects and high strain sensitivity, microstructured thin metal films. Microfabrication of the sensors combines traditional thin film process and additive manufacturing techniques. We incorporate the skin on a textile glove and demonstrate its function as an interface for finger motion and posture detection using a robotic test platform.

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Soft metal constructs for large strain sensor membrane

Cited by 21 publications

References 44 publications

Enhanced performance of microfluidic soft pressure sensors with embedded solid microspheres

Enhanced performance of microfluidic soft pressure sensors with embedded solid microspheres

Adsorbed Eutectic GaIn Structures on a Neoprene Foam for Stretchable MRI Coils

Soft flexion sensors integrating strechable metal conductors on a silicone substrate for smart glove applications

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