Cephalopod-Inspired Stretchable Self-Morphing Skin Via Embedded Printing and Twisted Spiral Artificial Muscles,Advanced Functional Materials

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Cephalopod-Inspired Stretchable Self-Morphing Skin Via Embedded Printing and Twisted Spiral Artificial Muscles
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-09-13 , DOI: 10.1002/adfm.202105528
Fan Fei ₁ , Parth Kotak ₂ , Li He _{3,

4} , Xiaofeng Li ₅ , Cyan Vanderhoef ₂ , Caterina Lamuta ₂ , Xuan Song ₁

Affiliation

Cutaneous muscles drive the texture-modulation behavior of cephalopods by protruding several millimeters out of the skin. Inspired by cephalopods, a self-morphing, stretchable smart skin containing embedded-printed electrodes and actuated by Twisted Spiral Artificial Muscles (TSAMs) is proposed. Electrothermally actuated TSAMs are manufactured from inexpensive polymer fibers to mimic the papillae muscles of cephalopods. These spirals can produce strains of nearly 2000% using a voltage of only 0.02 V mm⁻¹. Stretchable and low-resistance liquid metal electrodes are embedded-printed inside the self-morphing skin to facilitate the electrothermal actuation of TSAMs. Theoretical and numerical models are proposed to describe the embedded printing of low-viscosity Newtonian liquid metals as conductive electrodes in a soft elastomeric substrate. Experimental mechanical tests are performed to demonstrate the robustness and electrical stability of the electrodes. Two smart skin prototypes are fabricated to highlight the capabilities of the proposed self-morphing system, including a texture-modulating wearable soft glove and a waterproof skin that emulates the texture-modulation behavior of octopi underwater. The proposed self-morphing stretchable smart skin can find use in a wide range of applications, such as refreshable Braille displays, haptic feedback devices, turbulence tripping, and antifouling devices for underwater vehicles.

中文翻译：

通过嵌入打印和扭曲螺旋人工肌肉受头足类动物启发的可拉伸自变形皮肤

皮肤肌肉通过突出皮肤几毫米来驱动头足类动物的纹理调节行为。受头足类动物的启发，提出了一种包含嵌入印刷电极并由扭曲螺旋人工肌肉 (TSAM) 驱动的自变形、可拉伸智能皮肤。电热驱动的 TSAM 由廉价的聚合物纤维制成，以模拟头足类动物的乳头肌。这些螺旋可以使用仅 0.02 V mm ^-1的电压产生近 2000% 的应变. 可拉伸和低电阻液态金属电极嵌入印刷在自变形皮肤内，以促进 TSAM 的电热驱动。提出了理论和数值模型来描述低粘度牛顿液态金属作为导电电极在软弹性基材中的嵌入印刷。进行实验机械测试以证明电极的稳健性和电稳定性。制造了两个智能皮肤原型以突出所提出的自变形系统的功能，包括纹理调节可穿戴软手套和模拟章鱼水下纹理调节行为的防水皮肤。提出的自变形可拉伸智能皮肤可用于广泛的应用，例如可刷新的盲文显示器、

更新日期：2021-11-10

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