An Ionic Liquid Based Strain Sensor for Large Displacements

Keulemans, Grim; Pelgrims, Patrick; Bakula, Marko; Ceyssens, Frederik; Puers, Robert

doi:10.1016/j.proeng.2014.11.362

Cited by 18 publications

(18 citation statements)

References 8 publications

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“…This contrasts with solid-state strain sensors because of their intrinsic mechanical mismatch between conductive solid nanomaterials and an elastomeric matrix . Although there have been a couple of papers that reported ionic liquid based strain sensors, ,− optically transparent strain sensors by refractive-index tuning of ionic liquids and its capability for measuring the diverse deformations are unprecedented. Furthermore, our simple-structured microfluidic strain sensor was attached to a finger, wrist, and arm to confirm its capability of detecting various human motions in real time.…”

Section: Introductionmentioning

confidence: 99%

Highly Stretchable and Transparent Microfluidic Strain Sensors for Monitoring Human Body Motions

Yoon

Koo

Chang

2015

ACS Appl. Mater. Interfaces

145

118

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We report a new class of simple microfluidic strain sensors with high stretchability, transparency, sensitivity, and long-term stability with no considerable hysteresis and a fast response to various deformations by combining the merits of microfluidic techniques and ionic liquids. The high optical transparency of the strain sensors was achieved by introducing refractive-index matched ionic liquids into microfluidic networks or channels embedded in an elastomeric matrix. The microfluidic strain sensors offer the outstanding sensor performance under a variety of deformations induced by stretching, bending, pressing, and twisting of the microfluidic strain sensors. The principle of our microfluidic strain sensor is explained by a theoretical model based on the elastic channel deformation. In order to demonstrate its capability of practical usage, the simple-structured microfluidic strain sensors were performed onto a finger, wrist, and arm. The highly stretchable and transparent microfluidic strain sensors were successfully applied as potential platforms for distinctively monitoring a wide range of human body motions in real time. Our novel microfluidic strain sensors show great promise for making future stretchable electronic devices.

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Section: Introductionmentioning

confidence: 99%

Highly Stretchable and Transparent Microfluidic Strain Sensors for Monitoring Human Body Motions

Yoon

Koo

Chang

2015

ACS Appl. Mater. Interfaces

145

118

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“…These sensors are commonly made up of elastomeric matrices, i.e., elastomeric silicon, PDMS, and Ecoflex with embedded microchannels filled with conductive liquids. External force induces change in length and the cross‐sectional areas of the ion‐conducting channels ( Figure a), that change the impedance of the channel, which can be measured by the AC impedance measurements . As established by various theoretical and experimental results, the change of resistance of these sensors is a function only of change in geometry of the microchannels.…”

Section: Transduction Mechanismsmentioning

confidence: 99%

“…This group, in particular, has utilized hydrogel as an ionic sensory matrix to monitor the mechanical deformations similar to human skin. Thereafter, many researchers have attempted to use various ionic materials including ILs, ionic gels/polymers, and hydrogels to develop the ITS with human skin‐like perceptive characteristics and have tried to fabricate multimodal ITS . These ITS could successfully perceive multiple external stimuli such as normal pressures, shear forces, and torsional forces.…”

Section: Introductionmentioning

confidence: 99%

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Amoli

Kim

et al. 2019

Adv Funct Materials

153

119

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Ionic tactile sensors (ITS) represent a new class of deformable sensory platforms that mimic not only the tactile functions and topological structures but also the mechanotransduction mechanism across the biological ion channels in human skin, which can demonstrate a more advanced biological interface for targeting emerging human-interactive technologies compared to conventional e-skin devices. Recently, flexible and even stretchable ITS have been developed using novel structural designs and strategies in materials and devices. These skin-like tactile sensors can effectively sense pressure, strain, shear, torsion, and other external stimuli with high sensitivity, high reliability, and rapid response beyond those of human perception. In this review, the recent developments of the ITS based on the novel concepts, structural designs, and strategies in materials innovation are entirely highlighted. In particular, biomimetic approaches have led to the development of the ITS that extend beyond the tactile sensory capabilities of human skin such as sensitivity, pressure detection range, and multimodality. Furthermore, the recent progress in self-powered and self-healable ITS, which should be strongly required to allow human-interactive artificial sensory platforms is reviewed. The applications of ITS in human-interactive technologies including artificial skin, wearable medical devices, and user-interactive interfaces are highlighted. Last, perspectives on the current challenges and the future directions of this field are presented.

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“…Flexible fiber‐based textile‐incorporated strain sensors come in three sensing types: resistive, capacitive, and inductive. Piezoresistive strain sensors—commonly composed of composites combining thermoplastic elastomers or elastic thermosets and conductive materials such as carbon nanotubes or filled tubes of conductive liquids such as room‐temperature liquid metals or ionic liquids—are fairly common and the simplest systems for signal analysis (voltage reading) . Alternative morphologies have also been explored using painting and printing techniques to produce wearable patches .…”

Section: Introductionmentioning

confidence: 99%

Textile‐Based Inductive Soft Strain Sensors for Fast Frequency Movement and Their Application in Wearable Devices Measuring Multiaxial Hip Joint Angles during Running

Tavassolian

Cuthbert

Napier

et al. 2020

Advanced Intelligent Systems

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Wearable multiaxes motion tracking with inductive sensors and machine learning is presented. The production, characterization, and use of a modular and sizeadjustable inductive sensor for kinematic motion tracking are introduced. The sensor is highly stable and able to track high-frequency (>15 Hz) and high strain rates (>450% s À1 ). Four sensors are used to fabricate a pair of motion capture shorts. A random forest machine learning algorithm is used to predict the sagittal, transverse, and frontal hip joint angle, using the raw signals from sport shorts during running with a cohort of 12 participants against a gold standard optical motion capture system to an accuracy as high as R 2 ¼ 0.98 and root mean squared error of 2 in all three planes. Herein, an alternative strain sensor is provided to those typically used (piezoresistive/capacitive) for soft wearable motion capture devices with distinct advantages that can find applications in smart wearable devices, robotics, or direct integration into textiles.

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An Ionic Liquid Based Strain Sensor for Large Displacements

Cited by 18 publications

References 8 publications

Highly Stretchable and Transparent Microfluidic Strain Sensors for Monitoring Human Body Motions

Highly Stretchable and Transparent Microfluidic Strain Sensors for Monitoring Human Body Motions

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Textile‐Based Inductive Soft Strain Sensors for Fast Frequency Movement and Their Application in Wearable Devices Measuring Multiaxial Hip Joint Angles during Running

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