Vertical Fibrous Morphology and Structure-Function Relationship in Natural and Biomimetic Suction-Based Adhesion Discs

Su, Siwei; Wang, Siqi; Li, Lei; Xie, Zhexin; Hao, Fuchao; Xu, Jinliang; Wang, Shaokai; Guan, Juan; Wen, Li

doi:10.1016/j.matt.2020.01.018

Cited by 31 publications

(32 citation statements)

References 46 publications

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“…(B) Network of tendons in the toe pad of the gecko Gekko gecko (modified after Russell 1975 ). (C) Collagen fibers in the suction disc of the remora fish (modified after Su et al. 2020 ).…”

Section: Perspectives For the Design Of Tree-frog-inspired Adhesivesmentioning

confidence: 99%

“…Although the underlying physical mechanism is still under debate ( Mojdehi et al. 2017 ), the presence of fibrous elements in the surface region of the adhesive organs of geckos ( Autumn and Peattie 2002 ), insects ( Gorb and Beutel 2001 ), remora suckerfish ( Su et al. 2020 ), and tree frogs emphasizes the potential of fiber-reinforcement for the design of bioinspired adhesives, particularly for applications where strong attachment is required (e.g., soft heavy-duty grippers or fast moving robots).…”

Section: Perspectives For the Design Of Tree-frog-inspired Adhesivesmentioning

confidence: 99%

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Design of Tree-Frog-Inspired Adhesives

Langowski

Dodou

Assenbergh

et al. 2020

Integrative and Comparative Biology

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Synopsis The adhesive toe pads of tree frogs have inspired the design of various so-called ‘smooth’ synthetic adhesives for wet environments. However, these adhesives do not reach the attachment performance of their biological models in terms of contact formation, maintenance of attachment, and detachment. In tree frogs, attachment is facilitated by an interconnected ensemble of superficial and internal morphological components, which together form a functional unit. To help bridging the gap between biological and bioinspired adhesives, in this review, we (1) provide an overview of the functional components of tree frog toe pads, (2) investigate which of these components (and attachment mechanisms implemented therein) have already been transferred into synthetic adhesives, and (3) highlight functional analogies between existing synthetic adhesives and tree frogs regarding the fundamental mechanisms of attachment. We found that most existing tree-frog-inspired adhesives mimic the micropatterned surface of the ventral epidermis of frog pads. Geometrical and material properties differ between these synthetic adhesives and their biological model, which indicates similarity in appearance rather than function. Important internal functional components such as fiber-reinforcement and muscle fibers for attachment control have not been considered in the design of tree-frog-inspired adhesives. Experimental work on tree-frog-inspired adhesives suggests that the micropatterning of adhesives with low-aspect-ratio pillars enables crack arresting and the drainage of interstitial liquids, which both facilitate the generation of van der Waals forces. Our analysis of experimental work on tree-frog-inspired adhesives indicates that interstitial liquids such as the mucus secreted by tree frogs play a role in detachment. Based on these findings, we provide suggestions for the future design of biomimetic adhesives. Specifically, we propose to implement internal fiber-reinforcements inspired by the fibrous structures in frog pads to create mechanically reinforced soft adhesives for high-load applications. Contractile components may stimulate the design of actuated synthetic adhesives with fine-tunable control of attachment strength. An integrative approach is needed for the design of tree-frog-inspired adhesives that are functionally analogous with their biological paradigm.

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“…(B) Network of tendons in the toe pad of the gecko Gekko gecko (modified after Russell 1975 ). (C) Collagen fibers in the suction disc of the remora fish (modified after Su et al. 2020 ).…”

Section: Perspectives For the Design Of Tree-frog-inspired Adhesivesmentioning

confidence: 99%

Section: Perspectives For the Design Of Tree-frog-inspired Adhesivesmentioning

confidence: 99%

Design of Tree-Frog-Inspired Adhesives

Langowski

Dodou

Assenbergh

et al. 2020

Integrative and Comparative Biology

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“…However, a biomimetic study of cross-medium and multiterrain hitchhiking in nature is still lacking and not well studied. Remoras, which have attracted growing attention recently (35)(36)(37)(38)(39)(40)(41)(42), can hitchhike on fast-moving marine hosts (such as sharks, whales, marlins, and human divers) to reduce their energy consumption. The remora's hitchhiking ability derives from the adhesive disc located on the dorsal side of its head.…”

Section: Introductionmentioning

confidence: 99%

Aerial-aquatic robots capable of crossing the air-water boundary and hitchhiking on surfaces

Wang

Zhang

et al. 2022

Sci. Robot.

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Many real-world applications for robots—such as long-term aerial and underwater observation, cross-medium operations, and marine life surveys—require robots with the ability to move between the air-water boundary. Here, we describe an aerial-aquatic hitchhiking robot that is self-contained for flying, swimming, and attaching to surfaces in both air and water and that can seamlessly move between the two. We describe this robot’s redundant, hydrostatically enhanced hitchhiking device, inspired by the morphology of a remora ( Echeneis naucrates ) disc, which works in both air and water. As with the biological remora disc, this device has separate lamellar compartments for redundant sealing, which enables the robot to achieve adhesion and hitchhike with only partial disc attachment. The self-contained, rotor-based aerial-aquatic robot, which has passively morphing propellers that unfold in the air and fold underwater, can cross the air-water boundary in 0.35 second. The robot can perform rapid attachment and detachment on challenging surfaces both in air and under water, including curved, rough, incomplete, and biofouling surfaces, and achieve long-duration adhesion with minimal oscillation. We also show that the robot can attach to and hitchhike on moving surfaces. In field tests, we show that the robot can record video in both media and move objects across the air/water boundary in a mountain stream and the ocean. We envision that this study can pave the way for future robots with autonomous biological detection, monitoring, and tracking capabilities in a wide variety of aerial-aquatic environments.

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“…These grippers are constantly improving in the direction of tactile, force feedback and rapid response precision control. Compared with the traditional rigid gripping hand, the soft gripping hand is more adaptable, but its softness will cause the problem of requiring a low load in the gripping hand [25].…”

Section: Introductionmentioning

confidence: 99%

Pneumatic Bionic Hand with Rigid-Flexible Coupling Structure

et al. 2022

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This paper presents a rigid-flexible composite of bionic hand structure design scheme solution for solving the problem of low load on the soft gripping hand. The bionic hand was designed based on the Fast Pneumatic Network (FPN) approach, which can produce a soft finger bending drive mechanism. A soft finger bending driver was developed and assembled into a human-like soft gripping hand which includes a thumb for omnidirectional movement and four modular soft fingers. An experimental comparison of silicone rubber materials with different properties was conducted to determine suitable materials. The combination of 3D printing technology and mold pouring technology was adopted to complete the prototype preparation of the bionic hand. Based on the second-order Yeoh model, a soft bionic finger mathematical model was established, and ABAQUS simulation analysis software was used for correction to verify the feasibility of the soft finger bending. We adopted a pneumatic control scheme based on a motor micro-pump and developed a human–computer interface through LabView. A comparative experiment was carried out on the bending performance of the finger, and the experimental data were analyzed to verify the accuracy of the mathematical model and simulation. In this study, the control system was designed, and the human-like finger gesture and grasping experiments were carried out.

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Vertical Fibrous Morphology and Structure-Function Relationship in Natural and Biomimetic Suction-Based Adhesion Discs

Cited by 31 publications

References 46 publications

Design of Tree-Frog-Inspired Adhesives

Design of Tree-Frog-Inspired Adhesives

Aerial-aquatic robots capable of crossing the air-water boundary and hitchhiking on surfaces

Pneumatic Bionic Hand with Rigid-Flexible Coupling Structure

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