Polyacrylamide Hydrogel Composite E-skin Fully Mimicking Human Skin
| Autor: | Fang-Liang Guo, Feng-Lian Yi, De-Yang Wang, Yuan-Qing Li, Shao-Yun Fu, Pei Huang |
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| Rok vydání: | 2021 |
| Předmět: |
Polyacrylamide Hydrogel
Materials science Flexibility (anatomy) Composite number Polyacrylamide Acrylic Resins Modulus 02 engineering and technology 010402 general chemistry 01 natural sciences chemistry.chemical_compound Biomimetic Materials Tensile Strength Ultimate tensile strength medicine Humans General Materials Science Fiber Composite material Skin Hydrogels 021001 nanoscience & nanotechnology Finite element method 0104 chemical sciences medicine.anatomical_structure chemistry 0210 nano-technology |
| Zdroj: | ACS applied materialsinterfaces. 13(27) |
| ISSN: | 1944-8252 |
| Popis: | Transparent e-skin that can fully mimic human skin with J-shaped mechanical-behavior and tactile sensing attributes have not yet been reported. In this work, the skin-like hydrogel composite with J-shaped mechanical behavior and highly transparent, tactile, soft but strong, flexible, and stretchable attributes is developed as structural strain sensing element for e-skin. Piezo-resistive polyacrylamide (PAAm) hydrogel is used as supporting matrix to endow high transparency, softness, flexibility, stretch-ability and strain sensing capability desired for e-skin. Ultrahigh molecular weight polyethylene (UHMWPE) fiber with a wavy configuration is designed as reinforcement filler to provide the tunable strain-limiting effect. As a result, the as-prepared UHMWPE fiber/PAAm composite e-skin presents unique "J-shape" stress-strain behavior akin to human skin. And the PAAm composite can switch from supersoft to highly stiff in the designed strain range up to 100% with a prominent tensile strength of 48.3 MPa, which enables it to have the high stretch-ability and excellent load-bearing ability, simultaneously. Moreover, finite element model is developed to clarify the stress distribution and damage evolution for the UHMWPE fiber/PAAm composite during the tensile process. The PAAm composite exhibits not only an excellent strain sensing performance with a long-term reliability up to 5000 loading-unloading cycles but also an extraordinary softness and mechanical strength with a low initial modulus of 6.7 kPa, which is matchable with soft human epidermis. Finally, the e-skin is used for demonstrations in monitoring various human activities and protecting structural integrity in designed strain ranges. The strategy for reinforcing piezo-resistive hydrogel with wavy-shaped UHMWPE fibers proposed here is promising for the development of transparent, flexible, soft but strong e-skin with a tunable strain-limiting effect akin to human skin. |
| Databáze: | OpenAIRE |
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