Volume-invariant ionic liquid microbands as highly durable wearable biomedical sensors

Wang, Yan; Gong, Shuping; Wang, Stephen Jia; Simon, George P.; Cheng, Wenlong

doi:10.1039/c5mh00284b

Cited by 130 publications

(119 citation statements)

References 34 publications

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“…These results indicate that conductivity of the D‐hydrogel was only provided by the Fe 3+ involved in the coordination of ions, while the conductivity of D‐hydrogel‐Li + was dependent on the interaction of Fe 3+ and free movement of the Li + , which not only improved the conductivity of hydrogels, but also increased the sensitivity of resistance. In addition, the relative resistance changes versus strains of the strain sensor can fit into a parabolic equation y = Ax 2 + Bx + C , where y is the relative resistance changes and x is the tensile strain . There is no relative resistance change when there is no strain applied to the sensor, so C is zero in the equation.…”

Section: Methodsmentioning

confidence: 99%

Integrated Functional High‐Strength Hydrogels with Metal‐Coordination Complexes and H‐Bonding Dual Physically Cross‐linked Networks

Liu

et al. 2018

Macromol. Rapid Commun.

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With the deepening of research on high-strength hydrogels, the multi-functional study of hydrogels has become a hot spot. In this paper, a dual cross-linked physical high-strength hydrogels is prepared by a relatively simple method. 2-Vinyl- 4,6-Diamino-2-vinyl-1,3,5-triazine (VDT) induces the formation of the first cross-linking points through the interaction of hydrogen bonds with poly(acrylamide-co-acrylic acid) (PAm-co-Ac) chains, then the secondary physical cross-linkers Fe that introduce ionic coordinates between Fe and -COO groups. Due to the synergistic effect of hydrogen bonding and ionic coordination, hydrogels possess high tensile strength (approx. 4.34 MPa), large elongation (approx. 17.64 times), and good healing properties under alkali solution after cutting into two pieces. Meanwhile, VDT contains diaminotriazine functional groups that easily form hydrogen bonds so that the polymer of hydrogels could absorb 5-fluorouridine. In addition, the contribution of ionic polymer segments enables pH to be sensitive to hydrogels and facilitates the adsorption of a large number of ionic monomers to form ionic conductive networks, the prepared hydrogel capacitor device has very high sensitivity to pressure and deformation, and can detect the movement behavior of the human body. The dual-physical cross-linked hydrogels had a selective adsorption to biological small molecules and could be assembled into a flexible wearable device with high sensitivity.

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Section: Methodsmentioning

confidence: 99%

Integrated Functional High‐Strength Hydrogels with Metal‐Coordination Complexes and H‐Bonding Dual Physically Cross‐linked Networks

Liu

et al. 2018

Macromol. Rapid Commun.

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“…It can be seen that Δ R / R 0 increases gradually with the increasing tensile strain; when stretched to 1700% strain, a 140% increase of resistance is acquired. The Δ R / R 0 versus strain could be well fitted into a parabolic equation:

y = A x^{2} + B x + C

where y represents the Δ R / R 0 , x stands for the stretch strain and the value A can be applied as a factor for the sensitivity of the strain sensor . In normal conditions, although the metallic materials have a much higher sensitivity, they merely maintain very weak ductility (<5%) …”

Section: Resultsmentioning

confidence: 99%

Highly Stretchable, Transparent, and Bio‐Friendly Strain Sensor Based on Self‐Recovery Ionic‐Covalent Hydrogels for Human Motion Monitoring

Sun

Zhou

et al. 2019

Macro Materials & Eng

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Stretchable, flexible, and strain‐sensitive hydrogels have gained tremendous attention due to their potential application in health monitoring devices and artificial intelligence. Nevertheless, it is still a huge challenge to develop an integrated strain sensor with excellent mechanical properties, broad sensing range, high transparency, biocompatibility, and self‐recovery. Herein, a simple paradigm of stretchable strain sensor based on multifunctional hydrogels is prepared by constructing synergistic effects among polyacrylamide (PAM), biocompatible macromolecule sodium alginate (SA), and Ca ion in covalently and ionically crosslinked networks. Under large deformation, the dynamic SA‐Ca2+ bonds effectively dissipate energy, serving as sacrificial bonds, while the PAM chains bridge the crack and stabilize the network, endowing hydrogels with outstanding mechanical performances, for instance, high stretchability and compressibility, as well as excellent self‐recovery performance. The hydrogel is assembled to be a transparent and wearable strain sensor, which has good sensitivity and very wide sensing range (0–1700%), and can precisely detect dynamic strains, including both low and high strains (20–800% strain). It also exhibits fast response time (800 ms) and long‐time stability (200 cycles). The sensor can monitor and distinguish complicated human motions, opening up a new route for broad potential applications of eco‐friendly flexible strain‐sensing devices.

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“…However, some of the conventional mechanical crack‐based strain sensors based on disconnection–reconnection events of the crack edges demonstrated high GF than resistive ITS strain sensors, but most of them worked in a narrow strain regime (<10%) . On the other hand, resistive ITS show outstanding detection of a wide range of strains (0.1–500%) . These qualities make resistive ITS a suitable candidate for a wide range of applications including human‐interactive technologies.…”

Section: Transduction Mechanismsmentioning

confidence: 99%

“…Among different ITS, transistor ITS exhibit high pressure sensitivity and possibility for large area integration, but the strain sensing feature is not realized in practice . Piezoresistive ITS can sense multiple external stimuli such as normal pressures, shear/torsional forces, and strain, but they exhibit low sensitivity, slow response, and considerable hysteresis . Supercapacitive ITS exhibit multimodal tactile sensing capabilities with high sensitivity and fast response with additional benefits of low voltage operation and large‐scale fabrication .…”

Section: Transduction Mechanismsmentioning

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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Volume-invariant ionic liquid microbands as highly durable wearable biomedical sensors

Abstract: Non-volatile and flow properties of ionic liquids allow for simple ‘fill and seal’ approach to fabricate high-performance wearable sensors without materials delamination or cracking.

Cited by 130 publications

References 34 publications

Integrated Functional High‐Strength Hydrogels with Metal‐Coordination Complexes and H‐Bonding Dual Physically Cross‐linked Networks

Integrated Functional High‐Strength Hydrogels with Metal‐Coordination Complexes and H‐Bonding Dual Physically Cross‐linked Networks

Highly Stretchable, Transparent, and Bio‐Friendly Strain Sensor Based on Self‐Recovery Ionic‐Covalent Hydrogels for Human Motion Monitoring

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

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