Polydiacetylene hydrogel self-healing capacitive strain sensor

Rao, V. Kesava; Shauloff, Nitzan; Sui, Xiaomeng; Wagner, H. Daniel; Jelinek, Raz

doi:10.1039/d0tc00576b

Cited by 63 publications

(55 citation statements)

References 70 publications

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“…Capacitance sensory devices are attracting growing interest owing to their high strain and pressure sensitivity, fast response, and pronounced operational stability. [ 34,35 ] In this research, we constructed a highly stable and durable capacitive strain sensor through integrating two super‐tough Zn‐alginate/PAM hydrogel conductors with a dielectric layer of PVA/PAA‐borax organogel, as shown in Figure ; and Figure S8 (Supporting Information). In the hydrogel conductor layers, partial dissociated Zn 2+ contributed to the ionic crosslink of alginate network, meanwhile the additional Zn 2+ caused by applied voltage could serve as the ion carriers.…”

Section: Mechanical Properties Of the Super‐tough Capacitive Strain Sensormentioning

confidence: 99%

A Highly Stable and Durable Capacitive Strain Sensor Based on Dynamically Super‐Tough Hydro/Organo‐Gels

Huang

et al. 2021

Adv Funct Materials

106

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Capacitive‐type strain sensors based on hydrogel ionic conductors have undergone rapid development benefited from their robust structure, drift‐free sensing, higher sensitivity, and precision. However, the unsatisfactory electro‐mechanical stability of the conventional hydrogel conductors, which are normally vulnerable to large deformation and severe mechanical impacts, remains a challenge. In addition, there is not enough research regarding the adhesiveness and mechanical properties of the dielectric layer, which is also critical for the mechanical adaptability of the whole device. Here, a dynamically super‐tough capacitive‐type strain sensor based on energy‐dissipative dual‐crosslinked hydrogel conductors and an organogel dielectric with high adhesive strength is developed. Combining with the mechanical advantages of the hydro/organo‐gels, the capacitive strain sensor exhibits high stretchability and superior linear dependence of sensitivity with a gauge factor of ≈0.8% at 100% strain. Moreover, the sensor displayed ultrastability against various severe mechanical stimuli that can even survive unprecedentedly from extremely catastrophic car run‐over by 20 times. With these synergistic mechanical advantages, the capacitive strain sensor is successfully applied as a highly‐reliable wearable sensing system to monitor diverse faint physiological signals and large‐range human motions.

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Section: Mechanical Properties Of the Super‐tough Capacitive Strain Sensormentioning

confidence: 99%

A Highly Stable and Durable Capacitive Strain Sensor Based on Dynamically Super‐Tough Hydro/Organo‐Gels

Huang

et al. 2021

Adv Funct Materials

106

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“…The resulting polydiacetylenes (PDAs) are of special interest as they typically exhibit a blue to red color transition upon change in environmental stimuli. 11 − 14 Diacetylene-containing gelators possess interesting properties and unique applications, especially if they can form gels that are photopolymerizable, which in turn result in novel stimuli-responsive functional materials. 15 − 17 The properties of the PDA derivatives have a strong dependance on their structures.…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of α-Anomeric Diacetylene-Containing Glycosides as Photopolymerizable Molecular Gelators

Wang

Chen

et al. 2022

ACS Omega

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Glycolipids with diacetylene functional groups are fascinating compounds with many practical uses. Among these, diacetylene-containing gelators are especially important because they can form photopolymerizable gels, which are useful stimuli-responsive materials. Inspired by the unique properties of diacetylene-containing gelators and to understand the structural influences especially the location of the diacetylene functional groups on the self-assembling properties, a series of 15 novel N -acetyl- d -glucosamine derivatives with the diacetylene functional group introduced at the anomeric position were designed and synthesized. The diacetylene function is attached to the sugar through α-glycosylation with the distance from the anomeric oxygen being varied from one, two, and three methylene groups, and the other side contains hydroxyl, carboxyl, phenyl, and alkyl substituents. Remarkably, all compounds can form self-assembled gels in one or more selected solvents. A majority of these synthesized diacetylene glycosides are effective gelators for ethanol/water (v/v 1:1), dimethyl sulfoxide/water (v/v 1:1), and toluene, and one compound also formed a hydrogel at 1.0 wt %. Typically, these glycosides form gels that are photopolymerizable to afford red-colored gels. Scanning electronic microscopy indicated that the gelators formed helices, fibers, and planar sheet-like morphologies. The chemical structures of the derivatives affected their gelation properties and responses to UV treatment. The carboxylic acid-functionalized derivative 17 was able to immobilize basic solutions and form transparent gels. We expect that these diacetylene glycosides especially the hydroxyl and carboxylic acid derivatives will be useful as stimuli-responsive glycolipids for biomedical research.

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“…Ion sensors usually need to bear periodic mechanical load to adapt to the dynamic environment, which inevitably leads to mechanical damage and greatly shortened service life. [7][8][9][10][11] Therefore, it is necessary to develop ionic conductors with high tensile strength and excellent DOI: 10.1002/mame.202100652 fatigue resistance. In practical use, these ionic conductors can synchronously detect changes in external deformation and transform those changes into electrical signals with high accuracy and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

High Performance Double Conductive Network Hydrogel Based on Soaking Strategy for Supercapacitors

Wang

et al. 2021

Macro Materials & Eng

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High performance and high conductivity have always been important indicators for the application of hydrogels in the field of soft electronics. However, it is difficult for hydrogels to have both high conductivity and excellent mechanical properties. In this paper, a simple and feasible method is proposed, which allows polyvinyl alcohol to be embedded in the porous polyacrylamide chemical crosslinked network to form a structure of rich pores, and then soaked in salt solution to form a dense structure of hydrogels. In order to obtain good mechanical properties and electrical conductivity synchronously the hydrogel is soaked in KCl and NaCl solutions, respectively. However, different properties hydrogels are obtained after soaked in different salt solution, such as the strain of hydrogel after soaked in NaCl solution reached 750%, the conductivity of hydrogel after soaked in KCl solution is high (15.7 S m −1 ) and performed excellent conductivity even at low temperature (0 °C). In addition to the hydrogel after soaked in KCl solution showed 13.3 mF cm −2 high capacitance, the CV curve with regular shape and low temperature (0 °C) usage capacity when used as super capacitor. The conductive hydrogel can be used as artificial neural signal sensor, allowing produce artificial skin in medical field.

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Polydiacetylene hydrogel self-healing capacitive strain sensor

Abstract: Highly sensitive and stretchable PDA–PAA–Cr3+ hydrogel capacitive strain sensor is fabricated and used to monitor mechanical deformation and human motion.

Cited by 63 publications

References 70 publications

A Highly Stable and Durable Capacitive Strain Sensor Based on Dynamically Super‐Tough Hydro/Organo‐Gels

A Highly Stable and Durable Capacitive Strain Sensor Based on Dynamically Super‐Tough Hydro/Organo‐Gels

Design and Synthesis of α-Anomeric Diacetylene-Containing Glycosides as Photopolymerizable Molecular Gelators

High Performance Double Conductive Network Hydrogel Based on Soaking Strategy for Supercapacitors

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