Fatigue-Resistant Mechanoresponsive Color-Changing Hydrogels for Vision-Based Tactile Robots

被引:1
作者
Liu, Jiabin [1 ]
Li, Wei [2 ]
Yu, She [3 ]
Blanchard, Sean [1 ]
Lin, Shaoting [1 ]
机构
[1] Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA
[2] SUNY Stony Brook, Dept Civil Engn, Stony Brook, NY 11794 USA
[3] Purdue Univ, Dept Ind Engn, W Lafayette, IN 47907 USA
基金
美国国家科学基金会;
关键词
fatigue resistant; photoelasticity; soft materials; tactile sensor; BIREFRINGENCE; DESIGN; TOUGH; POLYMERS; FRACTURE; RUBBER; SENSOR;
D O I
10.1002/adma.202407925
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Mechanoresponsive color-changing materials that can reversibly and resiliently change color in response to mechanical deformation are highly desirable for diverse modern technologies in optics, sensors, and robots; however, such materials are rarely achieved. Here, a fatigue-resistant mechanoresponsive color-changing hydrogel (FMCH) is reported that exhibits reversible, resilient, and predictable color changes under mechanical stress. At its undeformed state, the FMCH remains dark under a circular polariscope; upon uniaxial stretching of up to six times its initial length, it gradually shifts its color from black, to gray, yellow, and purple. Unlike traditional mechanoresponsive color-changing materials, FMCH maintains its performance across various strain rates for up to 10 000 cycles. Moreover, FMCH demonstrates superior mechanical properties with fracture toughness of 3000 J m-2, stretchability of 6, and fatigue threshold up to 400 J m-2. These exceptional mechanical and optical features are attributed to FMCH's substantial molecular entanglements and desirable hygroscopic salts, which synergistically enhance its mechanical toughness while preserving its color-changing performance. One application of this FMCH as a tactile sensoris then demonstrated for vision-based tactile robots, enabling them to discern material stiffness, object shape, spatial location, and applied pressure by translating stress distribution on the contact surface into discernible images. Mechanoresponsive color-changing materials that can reversibly and resiliently change color in response to stress are highly desirable for diverse technologies in optics, sensors, and robots; however, such materials are rarely achieved. This work reports a fatigue-resistant mechanoresponsive color-changing hydrogel that exhibits reversible, resilient, and predictable color changes under mechanical stress, for tactile robots by translating tactile sensations into visual images. image
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页数:10
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