Self-healing liquid metal hydrogel for human–computer interaction and infrared camouflage

Li, Xiaofei; Jiang, Miao; Du, Yunfei; Ding, Xiangdong; Xiao, Changfa; Wang, Yanyan; Yang, Yanyu; Zhuo, Yizhi; Zheng, Kun; Liu, Xianglan; Chen, Lin; Gong, Yi; Tian, Xingyou; Zhang, Xian

doi:10.1039/d3mh00341h

Cited by 64 publications

(25 citation statements)

References 66 publications

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“…This feature enables them not only to input the desired numbers on the LCD (liquid crystal display) through bending and extending fingers (for example, the LCD shows 3 when we extend 3 fingers), but also to control the manipulator. 164,165 Using multiple LM–hydrogel electrodes to form a sensing array, combined with data processing, wireless transmission and machine learning components, a sign language interpretation system can be further developed (Fig. 7d and e).…”

Section: Applications Of Lm–hydrogel Compositesmentioning

confidence: 99%

Liquid metal–hydrogel composites for flexible electronics

Chen,

Tian,

Liang

et al. 2023

Chem. Commun.

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Section: Applications Of Lm–hydrogel Compositesmentioning

confidence: 99%

Liquid metal–hydrogel composites for flexible electronics

Chen,

Tian,

Liang

et al. 2023

Chem. Commun.

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“…An inherently stretchable and conductive material having intrinsic deformability is highly desirable . Typically, wearable strain sensors are prepared by combining soft polymeric materials [polyurethane, rubber, polyethylene terephthalate (PET), cellulose, polydimethylsiloxane (PDMS), and polyamide (PI)] − with conductive fillers like ionic liquids, , liquid metals, , nanomaterials, − or conductive polymers. , …”

Section: Introductionmentioning

confidence: 99%

Secondary Chemical Cross-Linking to Improve Mechanical Properties in a Multifaceted Biocompatible Strain Sensor

Kushwaha,

Dey,

Gupta

et al. 2024

ACS Appl. Mater. Interfaces

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A new conductive and transparent organohydrogel is developed with high stretchability, excellent mechanical, self-healing, antifreezing, and adhesive properties. A simple one-pot polymerization method is used to create polyacrylamide cross-linked through N,N′-methylenebis(acrylamide) (MBAA) and divinylbenzene (DVB). The dual chemical cross-linked gel network is complemented by several physical cross-links via hydrogen bonding and π−π interaction. Multiple chemical and physical cross-links are used to construct the gel network that allows toughness (171 kPa), low modulus (≈45 kPa), excellent stretchability (>1100%), and self-healing ability. The use of appropriate proportions of the water/glycerol binary solvent system ensures efficient environment tolerance (−20 to 40 °C). Phytic acid is used as a conductive filler that provides excellent conductivity and contributes to the physical cross-linking. Dopamine is incorporated in the gel matrix, which endows excellent adhesive property of the gel. The organohydrogel-based strain sensors are developed with state-independent properties, highly linear dependence, and excellent antifatigue performance (>100 cycles). Moreover, during the practical wearable sensing tests, human motions can be detected, including speaking, smiling, and joint movement. Additionally, the sensor is biocompatible, indicating the potential applications for the next generation of epidermal sensors.

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“…As the digital healthcare landscape continues to evolve, – wearable strain sensors – have garnered significant interest in the fields of motion monitoring, , health monitoring, , and human–computer interactions. , Their flexibility, , softness, , and adhesion , have made hydrogels a key class of materials for next-generation flexible electronic sensing devices. – For instance, wearable sensors leveraging hydrogel with conductivity based on an amylopectin/poly(acrylamide–acrylic acid) polymer have been effectively utilized to monitor human movements . Similarly, flexible hydrogels developed from silver nanowires, carbon black nanoparticles, poly(vinyl alcohol) (PVA) and poly(acrylamide) exhibit high strain/pressure sensitivities .…”

Section: Introductionmentioning

confidence: 99%

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

Han,

Lu,

Wang

et al. 2023

ACS Sustainable Chem. Eng.

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This study introduces a sustainable bio-based hydrogel crafted from boat-fruited Sterculia seed polysaccharide (BF), silk fiber (SF), calcium chloride (CaCl2), and borax. The inherent hydrophilic groups and natural network structure of BF are conducive to the formation of a hydrogel with a high water content and a porous structure. The SF serves a dual role, providing structural support and acting as an antifreezing agent. The unique structure of this hydrogel is characterized by reversible dynamic cross-links, including hydrogen, borate ester, and Ca2+/–COOH coordination bonds, which endow it with excellent self-healing, mechanical, thermoreversible, and freeze-resistant properties. The bio-based hydrogel successfully adheres to various surfaces, including skin, and provides stable, repeatable electrical signals for the monitoring of diverse human movements (e.g., elbow and wrist movement) and subtle facial expressions. Moreover, the hydrogel exhibits excellent stability and reusability. Our study thus provides a convenient and environmentally friendly strategy for fabricating self-healing hydrogels with promising applications in healthcare monitoring or human–computer interactions.

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Self-healing liquid metal hydrogel for human–computer interaction and infrared camouflage

Abstract: Due to their mechanical flexibility, conductive hydrogels have been widely investigated in the fields of flexible electronics and soft robots, but their non-negligible disadvantages, such as poor toughness and limited...

Cited by 64 publications

References 66 publications

Liquid metal–hydrogel composites for flexible electronics

Liquid metal–hydrogel composites for flexible electronics

Secondary Chemical Cross-Linking to Improve Mechanical Properties in a Multifaceted Biocompatible Strain Sensor

Self-Healing and Freeze-Resistant Boat-Fruited Sterculia Seed Polysaccharide/Silk Fiber Hydrogel for Wearable Strain Sensors

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