Fibrillar adhesives with unprecedented adhesion strength, switchability and scalability

National Science Review, Journal Year: 2024, Volume and Issue: 11(10)

Published: March 20, 2024

Bio-inspired fibrillar adhesives have received worldwide attention but their potentials been limited by a trade-off between adhesion strength and switchability, size scale effect that restricts the fibrils to micro/nanoscales. Here, we report class of adhesive achieve unprecedented (∼2 MPa), switchability (∼2000), scalability (up millimeter-scale at single fibril level), leveraging rubber-to-glass (R2G) transition in shape memory polymers (SMPs). Moreover, R2G SMP arrays exhibit >1000 (with aid controlled buckling) an efficiency 57.8%, with apparent contact area scalable 1000 mm

Language: Английский

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Powerful UAV manipulation via bioinspired self-adaptive soft self-contained gripper

Science Advances, Journal Year: 2024, Volume and Issue: 10(19)

Published: May 8, 2024

Existing grippers for unmanned aerial vehicle (UAV) manipulation have persistent challenges, highlighting a need that are soft, self-adaptive, self-contained, easy to control, and lightweight. Inspired by tendril plants, we propose class of soft voltage driven based on winding deformation self-adaptive grasping. We design two types U-shaped eccentric circular tube actuators (UCTAs) using the liquid-gas phase-transition mechanism actuate UCTAs. Two UCTAs separately cross-arranged construct grippers, forming self-contained systems can be directly voltage. One gripper inspired climbers used delicate grasping, other hook strong These ideal deployment in UAVs because their self-adaptability, ease light weight, paving way achieve powerful with low positioning accuracy, no complex grasping planning, multiple environments.

Language: Английский

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Versatile adhesive skin enhances robotic interactions with the environment

Science Advances, Journal Year: 2025, Volume and Issue: 11(3)

Published: Jan. 17, 2025

Electronic skins endow robots with sensory functions but often lack the multifunctionality of natural skin, such as switchable adhesion. Current smart adhesives based on elastomers have limited adhesion tunability, which hinders their effective use for both carrying heavy loads and performing dexterous manipulations. Here, we report a versatile, one-size-fits-all robotic adhesive skin using shape memory polymers tunable rubber-to-glass phase transitions. The strength our can be changed from minimal (~1 kilopascal) sensing handling ultralightweight objects to ultrastrong (>1 megapascal) picking up lifting objects. Our versatile is expected greatly enhance ability intelligent interact environment.

Language: Английский

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Biomimetic Stimulus Responsiveness: From Materials Design to Device Integration

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(33)

Published: April 18, 2024

Abstract Intelligent actuators have attracted intensive attention due to their broad application scenarios, ranging from precision manufacturing and autonomous robotics adaptive medical devices. Therein, simplifying structure design streamlining fabrication processes for responsive materials is crucial achieving multifunctionality in intelligent actuators. Drawing inspiration nature, diverse stimuli‐responsive been developed, enabling the creation of a spectrum Herein, study aims provide systematic overview smart with different based on biomimetic strategies. The commences by describing typical stimulus‐response organisms subsequently categorizing nascent materials, summarizing respective mechanisms. Potential applications integrated into all‐in‐one systems are presented grippers, soft robots, sensors. Finally, ends an advancement summary together personal insight current challenges future directions.

Language: Английский

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Accessing pluripotent drones through reprogramming of dynamic soft self-healing chemical growth

National Science Review, Journal Year: 2025, Volume and Issue: 12(6)

Published: Feb. 17, 2025

ABSTRACT The functions of drones that are implemented by existing design paradigms usually fixed and do not have the possibility further ‘differentiation’. Inspired biological concept pluripotency, here we report a pluripotent drone can ‘differentiate’ into series with different to perform variety challenging tasks. To realize this concept, propose method reprogrammable dynamic soft self-healing chemical growth (R-growth), which grow specific ‘organs’ achieve corresponding functions, after completing tasks, these be retracted. Furthermore, able respond possible damage through rapid (∼3.2 s, >1000 times faster than similar membranes). R-growth is large-scale (>1.5 m), fast (0.15 m/s), lightweight (∼5 g, 1/20 weight traditional micro air pumps), self-contained free-wheeling. This applied various significantly extend their enable an unprecedented range work realizes growth, retraction, switching any function, while such ability macro robots or humans, date, only exists in science fiction movies.

Language: Английский

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In‐Plane Combination of Micropillars with Distinct Aspect Ratios to Resist Overload‐Induced Adhesion Failure

Advanced Science, Journal Year: 2024, Volume and Issue: 11(28)

Published: May 8, 2024

Abstract Bioinspired micropillar adhesives have shown broad application prospects in space capture and docking, due to their strong adhesion, good environmental adaptability, reusability. However, when performing missions, unavoidable contact collision with target objects may cause large deformation of the micropillars, resulting loss adhesion ability. This study reports a novel adhesive through in‐plane combination micropillars (IPCM) different aspect ratios, consisting small pillars for retaining ones resisting overload‐induced failure. It is demonstrated that IPCM array can still maintain 85% peak after static compared general composed same pillars. The impact element size layout IPCM, as well detachment velocity on performance under high preload discussed. Furthermore, finite analysis qualitatively reproduces experimentally observed deformations attributes failure redistribution surface normal stress. Finally, potential dynamic objects. proposed opens up new design concepts practical applications bioinspired docking.

Language: Английский

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A review of bioinspired dry adhesives: from achieving strong adhesion to realizing switchable adhesion

Bioinspiration & Biomimetics, Journal Year: 2024, Volume and Issue: 19(5), P. 051003 - 051003

Published: July 12, 2024

In the early twenty-first century, extensive research has been conducted on geckos' ability to climb vertical walls with advancement of microscopy technology. Unprecedented studies and developments have focused adhesion mechanism, structural design, preparation methods, applications bioinspired dry adhesives. Notably, strong that adheres both principles contact splitting stress uniform distribution discovered proposed. The increasing popularity flexible electronic skins, soft crawling robots, smart assembly systems made switchable properties essential for These adhesives are designed be programmable in response external stimuli such as magnetic fields, thermal changes, electrical signals, light exposure well mechanical processes. This paper provides a comprehensive review development history from achieving realizing adhesion.

Language: Английский

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Advancing smart dry adhesives with shape memory polymers

International Journal of Smart and Nano Materials, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 41

Published: Dec. 17, 2024

Smart dry adhesives, a rapidly growing class of intelligent materials and structures, are engineered to provide strong, robust adhesion when needed while also allowing for controlled, easy detachment in response specific stimuli. Traditional smart often exemplified by fibrillar structures made elastomers, face number challenges. These include limitations on maximum strength imposed microstructural dimensions, restricted adaptability surfaces with varying degrees roughness, an inherent trade-off between switchability. This review explores how shape memory polymers (SMPs) can address these challenges and, through their rubber-to-glass (R2G) transition capability, powerful foundation the next generation adhesives. Specifically, we summarize elucidate mechanisms which SMPs enhance switchability material characteristics such as tunable stiffness, shape-locking, shape-memory effects. Additionally, discuss wide range innovative designs applications SMP offering insights into ongoing emerging opportunities this evolving field.

Language: Английский

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In Situ Growth of Mushroom‐Shaped Adhesive Structures on Flat/Curved Surfaces via Electrical Modulation

Advanced Science, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 5, 2024

Abstract Gecko‐inspired adhesives have an extraordinary impact on robotic manipulation and locomotion. However, achieving excellent adhesive performance curved surfaces, especially undevelopable is still challenging. This can be attributed to a considerable difference between the fabrication method practical necessity, i.e., structures are generally fabricated flat substrate whereas manipulating surface curved, resulting in low strength. Here, in‐situ growth strategy proposed fabricate mushroom‐shaped at micro/nano‐scale via electrical modulation or surfaces. Since directly grown target surfaces without transfer procedure, they exhibit large contact area stress uniformity interface, corresponding force. A comparison using those traditional approaches suggests that forces identical for testing while up 4 times developable even 25 The adhesion extends application prospects of gecko‐inspired from ones, composed opening new avenue develop adhesive‐based devices systems.

Language: Английский

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Gecko-inspired Intelligent Adhesive Structures for Rough Surfaces

Research, Journal Year: 2025, Volume and Issue: 8

Published: Jan. 1, 2025

Biomimetic dry adhesive structures, inspired by geckos’ climbing abilities, have attracted research attention in recent years. However, achieving superior adhesion on a rough surface remains an important challenge, which limits practical applications. Conventional bionic methods perform well smooth surfaces, but strength drastically decreases surfaces due to the reduced contact area. Generally, various structures been proposed increase area without assessing states, against obtaining good performance surfaces. If intelligent approach could be introduced it would beneficial for promoting development of gecko-inspired adhesives. existing with sensing function usually utilize support function, i.e., sensor function; other few supports adhesion, they do not focus improving Inspired synergistic effect kinematic system during crawling process geckos, this study proposes structure The combines hierarchical based gecko paw microhairs flexible capacitive unit. Experimental observations and analytical modeling demonstrate that incorporating mushroom-shaped inclined micropillars can reduce interface stiffness, notably enhancing while allowing real-time monitoring states. Moreover, innovative smart facilitates morphology interfaces, presenting potential advancements

Language: Английский

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