Nanocomposite hydrogels for strain sensing based on optical and electrical signals: a review

Yue, Youfeng

doi:10.1039/d3cc01580g

Cited by 11 publications

(5 citation statements)

References 83 publications

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“…Crosslinking : nanocomposite hydrogels can be synthesized by crosslinking pre-formed polymers with nanoparticles. 44 The nanoparticles are mixed with the polymer solution, and crosslinking agents form a three-dimensional network. Blending approach : in this method, pre-formed nanoparticles and polymers are blended to form a nanocomposite hydrogel.…”

Section: Nanocomposite Hydrogel Formulation and Designmentioning

confidence: 99%

“…Blending approach : in this method, pre-formed nanoparticles and polymers are blended to form a nanocomposite hydrogel. 44 The nanoparticles and polymers can be mixed using stirring, sonication, or extrusion techniques. The radical polymerization method involves using radical initiators to polymerize monomers in the presence of nanoparticles.…”

Section: Nanocomposite Hydrogel Formulation and Designmentioning

confidence: 99%

See 1 more Smart Citation

Revolutionizing biomedicine: advancements, applications, and prospects of nanocomposite macromolecular carbohydrate-based hydrogel biomaterials: a review

Alshangiti,

El-damhougy,

Zaher

et al. 2023

RSC Adv.

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Section: Nanocomposite Hydrogel Formulation and Designmentioning

confidence: 99%

Section: Nanocomposite Hydrogel Formulation and Designmentioning

confidence: 99%

Revolutionizing biomedicine: advancements, applications, and prospects of nanocomposite macromolecular carbohydrate-based hydrogel biomaterials: a review

Alshangiti,

El-damhougy,

Zaher

et al. 2023

RSC Adv.

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“…PAAm is selected because it is widely used as a representative and nontoxic hydrophilic polymer to synthesize isotropic hydrogels with various applications in the pharmaceutical, 29 biomedical, 30 and soft flexible sensors. 31 It is found that the cross-linker content significantly affects the mechanical properties of PAAm gels and PDGI/PAAm gels. The cross-linker content also affects the adhesion of PAAm gels, while it has little effect on the adhesion of PDGI/PAAm gels.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the effects of the cross-linker content on the mechanical properties (e.g., tensile behaviors, viscoelasticity, and crack resistance) and adhesion performances are explored in PAAm gels and PDGI/PAAm gels. PAAm is selected because it is widely used as a representative and nontoxic hydrophilic polymer to synthesize isotropic hydrogels with various applications in the pharmaceutical, biomedical, and soft flexible sensors . It is found that the cross-linker content significantly affects the mechanical properties of PAAm gels and PDGI/PAAm gels.…”

Section: Introductionmentioning

confidence: 99%

Designing Ultrahigh-Water-Content, Tough, and Crack-Resistant Hydrogels by Balancing Chemical Cross-Linking and Physical Entanglement

Yue

2024

ACS Appl. Eng. Mater.

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Hydrogels are cross-linked hydrophilic polymer structures containing large amounts of water. However, high water content or a high swelling of the gels can degrade the mechanical properties of most existing hydrogels. In this work, a series of polyacrylamide (PAAm) hydrogels with diverse crosslinker contents are synthesized by incorporating an acrylatefunctionalized cross-linker, N, N′-methylenebis (acrylamide), into polymer networks through free radical polymerization. These PAAm gels with different cross-linker contents are also embedded as soft layers in a layered hydrogel containing alternating poly(dodecyl glyceryl itaconate, PDGI) as hard layers. The effects of the cross-linking content on the mechanical properties and adhesion performance of PAAm and PDGI/PAAm gels are investigated. A strategy of balancing chemical cross-linking and physical entanglement is proposed to develop ultrahigh-water -content, tough, and crack-resistant hydrogels. The balance is achieved by introducing a very small amount of chemical cross-linker, which significantly improves the water content (>98 wt %), mechanical, and adhesion properties of PAAm gels. Additionally, a secondary balance between the soft and hard interfaces coupled with the first balance in the soft layers allows the design of highwater-content (>95 wt %) and tough PDGI/PAAm layered gels. The chemical cross-linking here tailors not only the mechanical properties of the soft layers but also the mobility of the polymer chains with functional groups at the interfaces. This study provides some insights into the effects of chemical cross-linking on the mechanical properties and adhesion performance of soft materials.

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“…An increasing number of ion-conductive hydrogels have achieved heat-to-electrical energy conversion, depending on the thermodiffusion effect 30 , 31 , the thermogalvanic effect 32 , 33 , and synergistic effects 34 . Based on the abovementioned skin-like gels, significant progress has also been made in temperature 35 , pressure 36 , 37 , and strain sensing 38 , 39 . Fu et al developed a tactile sensor with temperature and pressure responsiveness using a thermoelectrochemical hydrogel elastomer, and its equivalent Seebeck coefficient reached millivolts per Kelvin 40 .…”

Section: Introductionmentioning

confidence: 99%

Thermogalvanic hydrogel-based e-skin for self-powered on-body dual-modal temperature and strain sensing

Wang,

Li,

Yang

et al. 2024

Microsyst Nanoeng

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Sensing of both temperature and strain is crucial for various diagnostic and therapeutic purposes. Here, we present a novel hydrogel-based electronic skin (e-skin) capable of dual-mode sensing of temperature and strain. The thermocouple ion selected for this study is the iodine/triiodide (I−/I3−) redox couple, which is a common component in everyday disinfectants. By leveraging the thermoelectric conversion in conjunction with the inherent piezoresistive effect of a gel electrolyte, self-powered sensing is achieved by utilizing the temperature difference between the human body and the external environment. The composite hydrogels synthesized from polyvinyl alcohol (PVA) monomers using a simple freeze‒thaw method exhibit remarkable flexibility, extensibility, and adaptability to human tissue. The incorporation of zwitterions further augments the resistance of the hydrogel to dehydration and low temperatures, allowing maintenance of more than 90% of its weight after 48 h in the air. Given its robust thermal current response, the hydrogel was encapsulated and then integrated onto various areas of the human body, including the cheeks, fingers, and elbows. Furthermore, the detection of the head-down state and the monitoring of foot movements demonstrate the promising application of the hydrogel in supervising the neck posture of sedentary office workers and the activity status. The successful demonstration of self-powered on-body temperature and strain sensing opens up new possibilities for wearable intelligent electronics and robotics.

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Nanocomposite hydrogels for strain sensing based on optical and electrical signals: a review

Abstract: Unlike metals, ceramics, or plastics, hydrogels are semi-solid, hydrophilic polymer networks with high water content. Embedding nanostructures or nanomaterials into hydrogels can impact special properties to the composites, such as...

Cited by 11 publications

References 83 publications

Revolutionizing biomedicine: advancements, applications, and prospects of nanocomposite macromolecular carbohydrate-based hydrogel biomaterials: a review

Revolutionizing biomedicine: advancements, applications, and prospects of nanocomposite macromolecular carbohydrate-based hydrogel biomaterials: a review

Designing Ultrahigh-Water-Content, Tough, and Crack-Resistant Hydrogels by Balancing Chemical Cross-Linking and Physical Entanglement

Thermogalvanic hydrogel-based e-skin for self-powered on-body dual-modal temperature and strain sensing

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