Elastomer Surfaces with Directionally Dependent Adhesion Strength and Their Use in Transfer Printing with Continuous Roll‐to‐Roll Applications

Yang, Sang Yoon; Carlson, Andrew; Cheng, Huanyu; Yu, Qingmin; Ahmed, Numair; Wu, Jian; Kim, Seok; Sitti, Metin; Ferreira, Placid M.; Huang, Yonggang; Rogers, John A.

doi:10.1002/adma.201104975

Cited by 120 publications

(94 citation statements)

References 26 publications

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“…Using the same attachment method, gecko-inspired synthetic elastomeric fibrillar adhesives achieve bond strengths of over 100 kPa on smooth flat surfaces (4), surpassing the performance of the gecko on such surfaces (5), and exhibit quick release through peeling (6) or buckling (7) of the microfibers. For the past decade, gecko-inspired adhesives have been applied to a variety of systems including numerous robotic applications for wall climbing (8, 9), perching devices for flyers (10), and grippers (11)(12)(13)(14). However, difficulties arise in dealing with 3D surfaces because the current gecko-inspired synthetic adhesive systems are often supported by a rigid backing, which limits their ability to conform to nonplanar surfaces.…”

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confidence: 99%

Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces

Song

Drotlef

Majidi

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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174

165

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For adhering to three-dimensional (3D) surfaces or objects, current adhesion systems are limited by a fundamental trade-off between 3D surface conformability and high adhesion strength. This limitation arises from the need for a soft, mechanically compliant interface, which enables conformability to nonflat and irregularly shaped surfaces but significantly reduces the interfacial fracture strength. In this work, we overcome this trade-off with an adhesion-based soft-gripping system that exhibits enhanced fracture strength without sacrificing conformability to nonplanar 3D surfaces. Composed of a gecko-inspired elastomeric microfibrillar adhesive membrane supported by a pressure-controlled deformable gripper body, the proposed soft-gripping system controls the bonding strength by changing its internal pressure and exploiting the mechanics of interfacial equal load sharing. The soft adhesion system can use up to ∼26% of the maximum adhesion of the fibrillar membrane, which is 14× higher than the adhering membrane without load sharing. Our proposed load-sharing method suggests a paradigm for soft adhesion-based gripping and transfer-printing systems that achieves area scaling similar to that of a natural gecko footpad.soft gripper | equal load sharing | fracture mechanics | fibrillar adhesives | gecko B y exploiting principles of equal load sharing (1) and interfacial crack pinning (2), geckos' fibrillar foot-hairs can firmly adhere to a wide range of surfaces using intermolecular interactions, such as van der Waals forces (3). Using the same attachment method, gecko-inspired synthetic elastomeric fibrillar adhesives achieve bond strengths of over 100 kPa on smooth flat surfaces (4), surpassing the performance of the gecko on such surfaces (5), and exhibit quick release through peeling (6) or buckling (7) of the microfibers. For the past decade, gecko-inspired adhesives have been applied to a variety of systems including numerous robotic applications for wall climbing (8, 9), perching devices for flyers (10), and grippers (11)(12)(13)(14). However, difficulties arise in dealing with 3D surfaces because the current gecko-inspired synthetic adhesive systems are often supported by a rigid backing, which limits their ability to conform to nonplanar surfaces. In our previous work, we created elastomeric fibrillar adhesives integrated with a soft membrane, which we named as fibrillar adhesives on a membrane (FAM), and fixed the membrane onto a 3D-printed rigid plastic body so that the system could handle various 3D objects (15). Despite demonstrating a significant improvement over an unstructured elastomeric membrane with 10× higher adhesion, the tested FAM could achieve only 2 kPa of adhesion stress, a small fraction of the 55 kPa measured with rigid-backed microfiber arrays (16). This implies that the improved conformability to 3D surfaces enabled by the more compliant membrane backing is at the expense of a 96% reduction in adhesion strength. Considering that the adhesion of a membrane scales with the circumferential ...

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mentioning

confidence: 99%

Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces

Song

Drotlef

Majidi

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

174

165

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“…SMP stamp cold-state adhesion is in excess of 3 MPa (30 mN for 100μ m × 100μm stamp), which compares with 0.1 MPa previously demonstrated for equivalent PDMS stamps [5].…”

Section: Resultsmentioning

confidence: 68%

The Use of Shape Memory Polymers for Microassembly by Transfer Printing

Eisenhaure

Rhee

Al-Okaily

et al. 2014

J. Microelectromech. Syst.

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The advantages of utilizing the polymeric shape memory effect for deterministic assembly of microscale objects are explored in this letter. The assembly is performed by transfer printing, which involves a polymeric stamp with reversible adhesion as a manipulator. The dynamic rigidity control afforded by heating or cooling a shape memory polymer (SMP) stamp across its glass transition temperature allows for a dramatic increase in adhesion during pick-up. Furthermore, the shapefixing and recovery property of the SMP material enables substantial freedom in stamp design, such as more complex surface patterning and heterogeneous surface features to further reduce adhesion during release not otherwise available.[2014-0158]

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“…Prepared on thermally stable substrates, horizontally aligned, vertically aligned, or network-like CNTs can be transferred onto soft substrates via the technique of transfer printing. 33,34 When doping is used to reduce the sheet resistance, the conducting CNTs in a high density can be used as electrodes. In comparison to conventional electrodes, CNTs-based conducting films are stretchable, enabling applications in soft displays and bio-integrated devices.…”

Section: D Nanomaterialsmentioning

confidence: 99%

Reconfigurable systems for multifunctional electronics

2017

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Reconfigurable systems complement the existing efforts of miniaturizing integrated circuits to provide a new direction for the development of future electronics. Such systems can integrate low dimensional materials and metamaterials to enable functional transformation from the deformation to changes in multiple physical properties, including mechanical, electric, optical, and thermal. Capable of overcoming the mismatch in geometries and forms between rigid electronics and soft tissues, bio-integrated electronics enabled by reconfigurable systems can provide continuous monitoring of physiological signals. The new opportunities also extend beyond to human-computer interfaces, diagnostic/therapeutic platforms, and soft robotics. In the development of these systems, biomimicry has been a long lasting inspiration for the novel yet simple designs and technological innovations. As interdisciplinary research becomes evident in such development, collaboration across scientists and physicians from diverse backgrounds would be highly encouraged to tackle grand challenges in this field.

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Elastomer Surfaces with Directionally Dependent Adhesion Strength and Their Use in Transfer Printing with Continuous Roll‐to‐Roll Applications

Cited by 120 publications

References 26 publications

Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces

Controllable load sharing for soft adhesive interfaces on three-dimensional surfaces

The Use of Shape Memory Polymers for Microassembly by Transfer Printing

Reconfigurable systems for multifunctional electronics

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