High Capacity, Easy Release Adhesives From Renewable Materials

Crosby, Alfred J.

doi:10.1002/adma.201305593

Cited by 53 publications

(54 citation statements)

References 34 publications

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“…A prominent approach in this area is to create angled microstructures including angled pillars, [83,117,[129][130][131][132][133][134][135][136][137] angled "flap" features, [83,[138][139][140][141][142][143][144] and hierarchical structures. [40,42,152,153] Additionally, directional geometric or material features can be incorporated into film adhesives. This approach is effective with switching ratios typically ranging from 10 to 60.…”

Section: Controlled Loadingmentioning

confidence: 99%

Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

Self Cite

126

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.

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Section: Controlled Loadingmentioning

confidence: 99%

Switchable Adhesives for Multifunctional Interfaces

Croll

Hosseini

Bartlett

2019

Adv Materials Technologies

Self Cite

126

107

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“…The utilization of traditional adhesive materials are mostly composed of synthetic components, which are generally thrown away after the use, and it may not able to support a high load since it was difficult to remove while maintaining reversibility (Bartlett and Crosby, 2014). A renewable and reusable adhesive exhibited high force capacity and easy release characteristics was investigated in 2013.…”

Section: Properties Of Adhesivesmentioning

confidence: 99%

“…A renewable and reusable adhesive exhibited high force capacity and easy release characteristics was investigated in 2013. In that research, force capacity as high as 810 N over 100 cm 2 contact areas was examined and the results showed that it can enable high performing and reuse over many loading cycles (Bartlett and Crosby, 2014).…”

Section: Properties Of Adhesivesmentioning

confidence: 99%

“…Traditional pressure-sensitive adhesives has a widely use in commercial, however, they could either support a high load while difficult in removing or weak load but higher reversibility. Thus, a new adhesive material which could display high force capacity, easy release, and reusability over multiple cycles creates a new technological opportunity, which is to adopt renewable adhesives (Bartlett and Crosby, 2014).…”

Section: Properties Of Adhesivesmentioning

confidence: 99%

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Environmental effects and economic analysis of adhesives: a review of life cycle assessment (LCA) and techno-economic analysis (TEA)

Yang¹,

Rosentrater²

2015

2015 ASABE International Meeting

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In this paper, adhesives made either from fossil fuels or biological sources were examined. The purpose of this review was to investigate the development, processing, and production of bio-adhesives, especially key information about environmental and economic impacts of these types of adhesives. Specifically, the literature was reviewed in terms of life cycle assessment (LCA) and techno-economic analysis (TEA) in order to evaluate the environmental effects, economic performance and potential market acceptance. Several key parameters for life cycle analysis will be compared, such as resource consumption, ecosystem quality and human health; As for TEA, capital costs, operational costs, and unit costs will be explored, as well as the breakeven points. Underlying issues in LCA and TEA will be discussed, and we will examine areas needed for improvement for emerging biobased adhesives.

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“…Many wall-climbing robots have used electrostatics to adhere to insulating substrates [19][20][21][22][23][24], using low power but typically requiring voltages too high for standard electronic components. Some of the adhesion in these systems is due to the inherent adhesion of the tacky polymers used as insulators, which causes the electrodes to remain adhered even once the voltage is removed [25,26]. This makes them less desirable for clutching, where an automatic release would be advantageous.…”

Section: Introductionmentioning

confidence: 99%

A lightweight, low-power electroadhesive clutch and spring for exoskeleton actuation

Diller

Majidi

Collins

2016

2016 IEEE International Conference on Robotics and Automation (ICRA)

105

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Clutches can be used to enhance the functionality of springs or actuators in robotic devices. Here we describe a lightweight, low-power clutch used to control spring engagement in an ankle exoskeleton. The clutch is based on electrostatic adhesion between thin electrode sheets coated with a dielectric material. Each electrode pair weighs 1.5 g, bears up to 100 N, and changes states in less than 30 ms. We placed clutches in series with elastomer springs to allow control of spring engagement, and placed several clutched springs in parallel to discretely adjust stiffness. By engaging different numbers of springs, the system produced six different levels of stiffness. Force at peak displacement ranged from 14 to 501 N, and the device returned 95% of stored mechanical energy. Each clutched spring element weighed 26 g. We attached one clutched spring to an ankle exoskeleton and used it to engage the spring only while the foot was on the ground during 150 consecutive walking steps. Peak torque was 7.3 N·m on an average step, and the device consumed 0.6 mW of electricity. Compared to other electrically-controllable clutches, this approach results in three times higher torque density and two orders of magnitude lower power consumption per unit torque. We anticipate this technology will be incorporated into exoskeletons that tune stiffness online and into new actuator designs that utilize many lightweight, lowpower clutches acting in concert.

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High Capacity, Easy Release Adhesives From Renewable Materials

Cited by 53 publications

References 34 publications

Switchable Adhesives for Multifunctional Interfaces

Switchable Adhesives for Multifunctional Interfaces

Environmental effects and economic analysis of adhesives: a review of life cycle assessment (LCA) and techno-economic analysis (TEA)

A lightweight, low-power electroadhesive clutch and spring for exoskeleton actuation

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