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Climbing Plant‐Inspired Micropatterned Devices for Reversible Attachment
Advanced Functional Materials ( IF 19.0 ) Pub Date : 2020-07-21 , DOI: 10.1002/adfm.202003380
Isabella Fiorello 1, 2 , Omar Tricinci 1 , Giovanna Adele Naselli 1 , Alessio Mondini 1 , Carlo Filippeschi 1 , Francesca Tramacere 1 , Anand Kumar Mishra 3 , Barbara Mazzolai 1
Affiliation  

Climbing plants have evolved over millions of years and have adapted to unpredictable scenarios in unique ways. These crucial features make plants an outstanding biological model for scientists and engineers. Inspired by the ratchet‐like attachment mechanism of the hook‐climber Galium aparine, a novel micropatterned flexible mechanical interlocker is fabricated using a 3D direct laser lithography technique. The artificial hooks are designed based on a morphometric analysis of natural hooks. They are characterized in terms of pull‐off and shear forces, both in an array and as individual hooks. The microprinted hooks array shows high values of pull‐off forces (up to F ≈ 0.4 N cm−2) and shear forces (up to F// ≈ 13.8 N cm−2) on several rough surfaces (i.e., abrasive materials, fabrics, and artificial skin tissues). The contact separation forces of individual artificial hooks are estimated when loads with different orientations are applied (up to F ≈ 0.26 N). In addition, a patterned tape with directional microhooks is integrated into a mobile platform to demonstrate its climbing ability on inclined surfaces of up to 45°. This research opens up new opportunities for prototyping the next generation of mechanical interlockers, particularly for soft‐ and microrobotics, the textile industry, and biomedical fields.

中文翻译:

攀爬植物灵感的可重复附着的微图案设备

攀援植物已经发展了数百万年,并以独特的方式适应了不可预测的情况。这些关键特征使植物成为科学家和工程师的杰出生物学模型。受钩形攀爬器Galium aparine的棘轮状连接机制启发,使用3D直接激光光刻技术制造了一种新型的微图案柔性机械互锁器。人造钩是基于自然钩的形态分析设计的。它们以拉力和剪切力为特征,既可以成排排列,也可以单独钩挂。该缩微钩阵列示出拉脱力(高达高值˚F 听,说:0.4牛顿厘米-2)和剪切力(高达˚F //≈13.8 N cm -2)在几个粗糙的表面上(例如,研磨材料,织物和人造皮肤组织)。当施加具有不同取向的负载(高达个人人工钩的接触分离力估计˚F ≈0.26 N)。此外,带有方向性微钩的带状花纹带已集成到移动平台中,以展示其在最大45°倾斜表面上的爬坡能力。这项研究为下一代机械互锁装置的原型开发开辟了新的机遇,特别是对于软机器人和微型机器人,纺织工业和生物医学领域而言。
更新日期:2020-09-18
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