Polyacrylamide Hydrogel Composite E-skin Fully Mimicking Human Skin

被引:83
|
作者
Yi, Feng-Lian [1 ]
Guo, Fang-Liang [1 ]
Li, Yuan-Qing [1 ,2 ]
Wang, De-Yang [1 ]
Huang, Pei [1 ,2 ]
Fu, Shao-Yun [1 ,2 ]
机构
[1] Chongqing Univ, Coll Aerosp Engn, Chongqing 400044, Peoples R China
[2] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, Chongqing 400044, Peoples R China
基金
中国国家自然科学基金;
关键词
E-skin; hydrogel composite; piezo-resistivity; softness; strength; J-shaped mechanical behavior; MOLECULAR-WEIGHT POLYETHYLENE; STRAIN SENSORS; PULL-OUT; MECHANICS; PERFORMANCE; BEHAVIOR; FIBERS;
D O I
10.1021/acsami.1c05661
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:32084 / 32093
页数:10
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