Stretchable hydrogels with low hysteresis and anti-fatigue fracture based on polyprotein cross-linkers
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Hydrogel-based devices are widely used as flexible electronics, biosensors, soft robots, and intelligent human-machine interfaces. In these applications, high stretchability, low hysteresis, and anti-fatigue fracture are essential but can be rarely met in the same hydrogels simultaneously. Here, we demonstrate a hydrogel design using tandem-repeat proteins as the cross-linkers and random coiled polymers as the percolating network. Such a design allows the polyprotein cross-linkers only to experience considerable forces at the fracture zone and unfold to prevent crack propagation. Thus, we are able to decouple the hysteresis-toughness correlation and create hydrogels of high stretchability (~1100%), low hysteresis (< 5%), and high fracture toughness (~900 J m −2 ). Moreover, the hydrogels show a high fatigue threshold of ~126 J m −2 and can undergo 5000 load-unload cycles up to 500% strain without noticeable mechanical changes. Our study provides a general route to decouple network elasticity and local mechanical response in synthetic hydrogels.
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Synthetic hydrogels (PEG, PVA, PHEMA, PAM) with enhanced mechanical deformability and controlled structure and degradation can be used in sensors, actuators, soft robots, and wastewater treatment.
“synthetic hydrogels with enhanced mechanical deformability and controlled structure and degradation, such as polyethylene glycol (PEG), polyvinyl alcohol (PVA), poly(2-hydroxyethyl methacrylate) (PHEMA) and polyacrylamide (PAM), can be used in sensors, actuators, soft robots, and wastewater treatment”
From Functionalized Hydrogel-Based Wearable Gas and Humidity Sensors. (2023) · cites this paper as [101]
The Discussion (page not specified) reports highly stretchable engineered hydrogels and identifies sensors, actuators, and soft robotics as potential applications. The Results describe PEG- and polyacrylamide-based hydrogels, but the cited passages do not support the inclusion of PVA or PHEMA, controlled degradation, or wastewater treatment. (LLM, conf=0.87)
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Wang, Z., Zheng, X., Ouchi, T., Kouznetsova, T. B., Beech, H. K., Av-Ron, S., Matsuda, T., Bowser, B. H., Wang, S., Johnson, J. A., et al. (2021) · Science · doi:10.1126/science.abg2689 · Cited by 369 · see citing works
“reversible cross-linking (10, 12), noncovalent domain unfolding (13-16), and the addition of fillers (17).”
BackgroundResultFunctionalized Hydrogel-Based Wearable Gas and Humidity Sensors.
Luo, Y., Li, J., Ding, Q., Wang, H., Liu, C., & Wu, J. (2023) · Nano-Micro Letters · doi:10.1007/s40820-023-01109-2 · Cited by 236 · see citing works
“…with enhanced mechanical deformability and controlled structure and degradation, such as polyethylene glycol (PEG), polyvinyl alcohol (PVA), poly(2-hydroxyethyl methacrylate) (PHEMA) and polyacrylamide (PAM), can be used in sensors, actuators, soft robots, and wastewater treatment [95–101].”
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Self-citation
- Authors
- Lei, H., Dong, L., Li, Y., Zhang, J., Chen, H., Wu, J., Zhang, Y., Fan, Q., Xue, B., Qin, M., Chen, B., Cao, Y., & Wang, W.
- Affiliations
- Collaborative Innovation Center of Advanced Microstructures (CN)
- Nanjing University of Information Science and Technology (CN)
- Nanjing University (CN)
- Zhejiang University (CN)
- Corresponding author
- Cao, Yi
- ORCID
- Venue
- Nature Communications
- Published
- 2020-08-12
- Volume
- 11
- Issue
- 1
- Pages
- 4032-4032
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC7423981
- OpenAlex
- W3048822132
- Cited by
- 288
- References
- 3
- Citations by year
- 2026: 45 · 2025: 60 · 2024: 66 · 2023: 52 · 2022: 34 · 2021: 29 · 2020: 2
- FWCI
- 9.77
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (21774057, 11934008, 020414380080, 11804147, 11974174, 11674153, 11804148)
- Government of Jiangsu Province
- Tianjin University
- Natural Science Foundation of Jiangsu Province (BK20180320, BK20180335)
- State Key Laboratory of Precision Measurement Technology and Instruments
- Fundamental Research Funds for the Central Universities (020414380080, 020414380148)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Hydrogels: synthesis, properties, applications
- Physical Sciences › Engineering › Mechanical Engineering › Advanced Materials and Mechanics
- Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
- Keywords
- stretchable hydrogels, tandem repeat proteins, random coil polymers, percolation network, hysteresis, fatigue resistance, fracture toughness, crack propagation, protein unfolding, network elasticity
- MeSH terms
- Polyacrylamides, Acrylic Resins, Cross-Linking Reagents, Fluorescence, Stress, Mechanical, Hydrogels, Polyproteins, Mechanical Phenomena
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