Peeling–Stiffening Self‐Adhesive Ionogel with Superhigh Interfacial Toughness

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(11)

Published: Dec. 14, 2023

Abstract Self‐adhesive materials that can directly adhere to diverse solid surfaces are indispensable in modern life and technologies. However, it remains a challenge develop self‐adhesive with strong adhesion while maintaining its intrinsic softness for efficient tackiness. Here, peeling–stiffening ionogel reconciles the seemingly contradictory properties of is reported. The contains two ionophilic repeating units distinct associating affinities, which allows adaptively wet rough surface soft dissipating state adhering, dramatically stiffen glassy upon peeling. corresponding modulus increases by 117 times driven strain‐rate‐induced phase separation, greatly suppresses crack propagation results super high interfacial toughness 8046 J m −2 . also transparent, self‐healable, recyclable, be easily removed simple moisture treatment. This strategy provides new way design high‐performance intelligent devices.

Language: Английский

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Laser-driven noncontact bubble transfer printing via a hydrogel composite stamp

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(5)

Published: Jan. 24, 2024

Transfer printing that enables heterogeneous integration of materials into spatially organized, functional arrangements is essential for developing unconventional electronic systems. Here, we report a laser-driven noncontact bubble transfer via hydrogel composite stamp, which features circular reservoir filled with inside stamp body and encapsulated by laser absorption layer an adhesion layer. This structure provides reversible thermal controlled in rapid manner through the liquid–gas phase transition water hydrogel. The ultrasoft nature minimizes influence preload on pick-up performance, offers strong interfacial under small reliable damage-free pick-up. light-matter interaction at interface induces to form bulge surface, eliminates successful printing. Demonstrations microscale Si platelets onto various challenging nonadhesive surfaces (e.g., glass, key, wrench, steel sphere, dry petal, droplet) two-dimensional or three-dimensional layouts illustrate unusual capabilities deterministic assembly develop systems such as flexible inorganic electronics, curved micro-LED display.

Language: Английский

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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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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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Switchable Adhesive Based on Shape Memory Polymer with Micropillars of Different Heights for Laser-Driven Noncontact Transfer Printing

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(7), P. 9443 - 9452

Published: Feb. 9, 2024

Switchable adhesive is essential to develop transfer printing, which an advanced heterogeneous material integration technique for developing electronic systems. Designing a switchable with strong adhesion strength that can also be easily eliminated enable noncontact printing still remains challenge. Here, we report simple yet robust design of based on thermally responsive shape memory polymer micropillars different heights. The takes advantage the shape-fixing property provide reliable pick-up and various levels recovery under laser heating eliminate in way. Systematic experimental numerical studies reveal switch mechanism insights into adhesives. This provides good solution laser-driven capability eliminating influence receivers performance printing. Demonstrations silicon wafers, microscale Si platelets, micro light emitting diode (μ-LED) chips onto challenging nonadhesive (e.g., sandpaper, stainless steel bead, leaf, or glass) form desired two-dimensional three-dimensional layouts illustrate its great potential deterministic assembly.

Language: Английский

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4D Printing of Magneto‐Thermo‐Responsive PLA/PMMA/Fe₃O₄ Nanocomposites with Superior Shape Memory and Remote Actuation

Macromolecular Materials and Engineering, Journal Year: 2024, Volume and Issue: 309(9)

Published: June 12, 2024

Abstract This study presents the development and 4D printing of magnetic shape memory polymers (MSMPs) utilizing a composite polylactic acid (PLA), polymethyl methacrylate (PMMA), Fe 3 O 4 nanoparticles. The dynamic mechanical analysis reveals that integration maintains broad thermal transition without significantly affecting α‐relaxation time, indicating high compatibility homogeneous distribution nanoparticles within polymer matrix. Field emission scanning electron microscopy further confirms PLA PMMA phases as well uniform dispersion nanoparticles, essential for effective transfer heat during process. Significantly, incorporation enables remote actuation capabilities, presenting substantial advancement biomedical applications. 4D‐printed MSMP nanocomposites exhibit exceptional properties rapid, efficient responses under both inductive direct heating stimuli, achieving 100% fixity recovery ≈85 s. They are proposed promising candidates implants, specifically minimally invasive implantation bone scaffolds, due to their rapid actuation, biocompatibility, robustness. research not only demonstrates printability high‐performance MSMPs but also introduces new possibilities application in regenerative medicine.

Language: Английский

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Highly switchable and reversible soft sticky adhesives based on thermo-responsive phase separation

Extreme Mechanics Letters, Journal Year: 2025, Volume and Issue: unknown, P. 102293 - 102293

Published: Jan. 1, 2025

Language: Английский

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Magnetically Actuated Adhesives with Switchable Adhesion

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(52)

Published: Sept. 13, 2023

Abstract Smart adhesives with the ability to rapidly switch, achieve high adhesion tuning ratios, and provide precise control hold tremendous potential in various fields ranging from micromanipulation manufacturing. Despite significant progress, an efficient robust adhesive switch remains a rarity. In this study, design strategy for magnetically actuated that exhibit switchable between low levels exceeding 50 times is proposed. The non‐contact actuation of magnetic field induces pre‐designed deformation tentacles, resulting both interface cracks at push force on target object. Consequently, pull‐off can be precisely adjusted according strength field. This proposed also exhibits ultrafast detachment (<1.0 s). Tentative experiments are conducted transfer‐print technology on‐demand detachment, which demonstrate advantages manner. switching may particularly useful practical applications require highly swiftly controlled movements.

Language: Английский

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Triple-Bioinspired Shape Memory Microcavities with Strong and Switchable Adhesion

ACS Nano, Journal Year: 2023, Volume and Issue: 17(23), P. 23595 - 23607

Published: Nov. 20, 2023

Smart adhesives with switchable adhesion have attracted considerable attention for their potential applications in sensors, soft grippers, and robots. In particular, surfaces controlled to both solids liquids received more attention, because of wider range applications. However, that exhibit controllable often cannot provide sufficient strength strong solid adhesion. To overcome this limitation, study developed a triple-bioinspired shape memory smart adhesive, drawing inspiration from the structures found octopus suckers, lotus leaves, creepers. Our adhesive design incorporates microcavities formed by polymer (SMP), which can transition between rubbery glassy states response temperature changes. By leveraging effect rubber–glass (R-G) phase SMP, surface smooth solids, rough water droplets could be switched adjusting applied force. Notably, designed herein exhibited high (up 420 kPa) on facilitated interlocking negative pressure generated within microcavities. Furthermore, programmable transport achieved utilizing This approach expands possibilities designing holds various different fields.

Language: Английский

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Ultrafast universal fabrication of configurable porous silicone-based elastomers by Joule heating chemistry

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(11)

Published: March 4, 2024

Silicone-based elastomers (SEs) have been extensively applied in numerous cutting-edge areas, including flexible electronics, biomedicine, 5G smart devices, mechanics, optics, soft robotics, etc. However, traditional strategies for the synthesis of polymer elastomers, such as bulk polymerization, suspension solution and emulsion are inevitably restricted by long-time usage, organic solvent additives, high energy consumption, environmental pollution. Here, we propose a Joule heating chemistry method ultrafast universal fabrication SEs with configurable porous structures tunable components (e.g., graphene, Ag, graphene oxide, TiO 2 , ZnO, Fe 3 O 4 V 5 MoS BN, g-C N BaCO CuI, BaTiO polyvinylidene fluoride, cellulose, styrene-butadiene rubber, montmorillonite, EuDySrAlSiO x ) within seconds only employing H solvent. The intrinsic dynamics situ polymerization porosity creation these widely investigated. Notably, capacitive sensor made from as-fabricated silicone-based exhibits wide pressure range, fast responses, long-term durability, extreme operating temperatures, outstanding applicability various media, wireless human–machine interaction system used rescue activities conditions is established, which paves way more polymer-based material wider applications.

Language: Английский

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