Thermally Active Liquid Crystal Network Gripper Mimicking the Self‐Peeling of Gecko Toe Pads

Shahsavan, Hamed; Salili, Seyyed Muhammad; Jákli, Antal; Zhao, Boxin

doi:10.1002/adma.201604021

Cited by 154 publications

(109 citation statements)

References 52 publications

(120 reference statements)

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“…[87,103,104] There are also examples in which peel likely plays a role at a microscopic level, but is not directly responsible for the switching (e.g., contact area is switched by peeling many tiny contacts). This is common to the removal of adhesive tapes.…”

Section: Peelmentioning

confidence: 99%

“…[86,87,98,103,[194][195][196][197] Using thermal changes to increase contact area has been adapted by Xie and Xiao through the use of a shape memory polymer bilayer. [86,87,98,103,[194][195][196][197] Using thermal changes to increase contact area has been adapted by Xie and Xiao through the use of a shape memory polymer bilayer.…”

Section: Shape Memorymentioning

confidence: 99%

“…[103] The material, cured in the nematic state, spontaneously curls when heated above the nematic/isotropic phase transition temperature. [103] The material, cured in the nematic state, spontaneously curls when heated above the nematic/isotropic phase transition temperature.…”

Section: Shape Memorymentioning

confidence: 99%

Section: Shape Memorymentioning

confidence: 99%

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Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

123

107

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The reliable bonding or attachment of materials is critical in many industries, is a common necessity of daily life, and is key to functionality in numerous biological settings. [1][2][3][4][5][6][7][8][9][10][11] Adhesives Joining two materials with an adhesive is an extremely common activity, but is most often irreversible. However, emerging and current applications ranging from consumer and medical products to soft robotics and wearable bio-monitoring devices demand strong adhesives which can be easily removed on-demand and subsequently reused. This requires new paradigms in adhesive science and engineering, resulting in the emergence of new classes of multifunctional switchable adhesives. Here summarized is the current state of the art in switchable adhesive systems, focusing on how devices fit into the basic science of adhesion while providing performance metrics for comparison across current approaches. Using fracture mechanics as a guide, systems are classified as functioning under one of three basic mechanisms: near-interface, contact area, or mechanical. These mechanisms must be initiated or "triggered" by a specific input, which can include mechanical, electromagnetic, fluidic, or thermal stimuli. Triggers and adhesion switching performance are compared through the use of a "switching ratio," the interfacial energy release rate, and an estimate of mechanism timing. Finally, it is discussed that how the fundamental mechanisms relate to challenges and opportunities for switchable interfaces in future applications and adhesive systems.

show abstract

Section: Peelmentioning

confidence: 99%

Section: Shape Memorymentioning

confidence: 99%

Section: Shape Memorymentioning

confidence: 99%

Section: Shape Memorymentioning

confidence: 99%

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Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

123

107

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“…Polymers that respond by changing shape or size to an external stimuli, such as electric1–7 and magnetic fields,1 heat,8–10 pressure11,12 pH,13,14 and light,7,15,16 have great potential for artificial muscles, soft robotics, and microsensors. Electroactive polymers (EAPs) can be insulating (electronic EAPs), or ionic EAPs (iEAPs) 5.…”

Section: Figurementioning

confidence: 99%

Poly(ethylene glycol) Diacrylate Based Electro‐Active Ionic Elastomer

Rajapaksha

Feng

Kyu

et al. 2020

Macromol. Rapid Commun.

Self Cite

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Preparation and low voltage induced bending (converse flexoelectricity) of crosslinked poly(ethylene glycol) diacrylate (PEGDA), modified with thiosiloxane (TS) and ionic liquid (1‐hexyl‐3‐methylimidazolium hexafluorophosphate) (IL) are reported. In between 2µm PEDOT:PSS electrodes at 1 V, it provides durable (95% retention under 5000 cycles) and relatively fast (2 s switching time) actuation with the second largest strain observed so far in ionic electro‐active polymers (iEAPs). In between 40 nm gold electrodes under 8 V DC voltage, the film can be completely curled up (270° bending angle) with 6% strain that, to the best of the knowledge, is unpreceded among iEAPs. These results render great potential for the TS/PEGDA/IL based electro‐active actuators for soft robotic applications.

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Elastic Energy Storage Enabled Magnetically Actuated, Octopus‐Inspired Smart Adhesive

Wang

Luo

Linghu

et al. 2020

Adv Funct Materials

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Octopus suckers offer remarkable adhesion performance against nonporous surfaces and have inspired extensive research to develop artificial adhesives. However, most of existing octopus‐inspired adhesives are either passive without an actuation strategy or active but not energy efficient. Here, a novel design of a magnetically actuated, energy‐efficient smart adhesive with rapidly tunable, great switchable, and highly reversible adhesion strength inspired by the elastic energy storage mechanism in octopus suckers is reported. The smart adhesive features two cavities separated by an elastic membrane with the upper cavity filled with magnetic particles while the lower one empty. The deformation of the elastic membrane can be actively controlled by an external magnetic field to change the cavity volume, thus generating a cavity‐pressure‐induced adhesion. Systematically experimental and theoretical studies reveal the fundamental aspects of design and operation of the smart adhesive and give insights into the underlying adhesion mechanisms. Demonstrations of this smart adhesive in transfer printing and manipulation of various surfaces in both dry and wet environments illustrate the potential for deterministic assembly and industrial or robotic manipulation.

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Thermally Active Liquid Crystal Network Gripper Mimicking the Self‐Peeling of Gecko Toe Pads

Cited by 154 publications

References 52 publications

Switchable Adhesives for Multifunctional Interfaces

Switchable Adhesives for Multifunctional Interfaces

Poly(ethylene glycol) Diacrylate Based Electro‐Active Ionic Elastomer

Elastic Energy Storage Enabled Magnetically Actuated, Octopus‐Inspired Smart Adhesive

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