Influence of surface roughness on wet adhesion of biomimetic adhesive pads with planar microstructures

Wang, Kun; He, Bin

doi:10.1049/mnl.2012.0683

Cited by 17 publications

(19 citation statements)

References 20 publications

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“…The plastic transition of GSMP at the temperature above T g generates negligible recovery force, ensuring the reliable contact on various surface. In contrast, the hyperelasticity of the widely used PDMS, which has an elastic modulus of ≈2 MPa similar to our GSMP, hinders the intimate contact with rough surfaces due to the elastic recovery force . As a result, the GSMP pillar top showed a faithful replica of the substrate surface after the detachment (Figure S7d, Supporting Information).…”

Section: Resultsmentioning

confidence: 85%

“…The combination of high contact possibility and the large SAR therefore generates good contacts on rough surfaces, showing better adhesion than that on smooth surfaces. This kind of high adhesion is difficult to achieve in conventional micropillar arrays (such as PDMS) that are difficult to change the shape in order to follow the topography of roughness . When the Sz of substrate is larger than the pillar height, for instance the surfaces with Sq of 3.78 and 4.3 µm, the contact possibility drops.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Switchable Adhesion of Micropillar Adhesive on Rough Surfaces

Tan

Wang

Quan

et al. 2019

Small

107

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/smll.201904248. Switchable structured adhesion on rough surfaces is highly desired for a wide range of applications. Combing the advantages of gecko seta and creeper root, a switchable fibrillar adhesive composed of polyurethane (PU) as the backing layer and graphene/shape memory polymer (GSMP) as the pillar array is developed. The photothermal effect of graphene (under UV irradiation) changes GSMP micropillars into the viscoelastic state, allowing easy and intimate contact on surfaces with a wide range of roughness. By controlling the phase state of GSMP via UV irradiation during detachment, the GSMP micropillar array can be switched between the robust-adhesion state (UV off ) and low-adhesion state (UV on). The state of GSMP micropillars determines the adhesion force capacity and the stress distribution at the detaching interface, and therefore the adhesion performance. The PU-GSMP adhesive achieves large adhesion strength (278 kPa), high switching ratio (29), and fast switching (10 s) at the same time. The results suggest a design principle for bioinspired structured adhesives, especially for reversible adhesion on surfaces with a wide range of roughness. www.advancedsciencenews.com

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Switchable Adhesion of Micropillar Adhesive on Rough Surfaces

Tan

Wang

Quan

et al. 2019

Small

107

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“…In general, the preparation of adhesion surfaces inspired by tree frog toe pads can be divided into two categories, bottom‐up (e.g. photolithography [13, 29–35, 37, 38, 43–50, 55] and etching [52–54, 56]) and top‐down (e.g. 3D printing [51] and embossing [36–38, 49]) approaches.…”

Section: Artificial Wet Adhesive Surfaces Inspired By Tree Frogsmentioning

confidence: 99%

Recent progress of tree frog toe pads inspired wet adhesive materials

Zhang

Wan

et al. 2022

Biosurface and Biotribology

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Wet adhesion has widespread applications in the fields of wearable electronics, medical devices and intelligent robots. In nature, many organisms have evolved with unique wet adhesion properties to adapt to complex habitats and climb in wet environments without falling. Tree frogs, as crawling masters in tropical rain forests, are representative of wet adhesion and give novel inspirations to design artificial wet adhesive materials by mimicking their specialised hexagonal structures and/or mucus composition. In this review, we first overview the research progress of tree frog toe pads from the perspective of toe pad structure and adhesion mechanism. Then, wet adhesive materials inspired by tree frog toe pads are systematically summarised from (i) the typical polymers, (ii) the preparation approaches, (iii) the adhesion test methods and (iv) the typical artificial adhesion surfaces. Third, various applications of bioinspired wet adhesive surfaces are highlighted. Finally, we present future challenges and opportunities to develop tree frog‐inspired wet adhesive materials.

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“…Previously [17], the tests were started while the samples were still floating in DI water, but here the tests were started after the DI water around the fiber samples was evaporated. The main purpose of this extra step is to decrease the wet adhesive force [22] by avoiding the water bridge between the fiber and the grippers. Humidity and temperature values were set manually via the control modules.…”

Section: B Setupmentioning

confidence: 99%

Releasing tool-adhered natural fibrous microscale objects with vacuum system

Lai

Cervinka

Kallio

2014

2014 IEEE/ASME International Conference on Advanced Intelligent Mechatronics

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This paper presents a novel method for releasing natural fibrous microscale objects from a microrobotic end-effector. A vacuum system is introduced to help overcome the adhesive force between a microgripper and a fiber, and realize a successful releasing process. Ten releasing tests were done using three humidity values: 25%, 55% and 85%. The test results show that 100% release rate was achieved in humidities of 25% and 85%. In humidity of 55%, the release rate was 90%. One special failure occurred at 55% humidity, in which the fiber was adhered to one of the gripper tips after opening both grippers, and inclined about 35º to the horizontal line. This angle decreased the vacuum effect on the fiber and failed the releasing process. The results suggested that 100% release rate can be achieved by increasing the vacuum force or adding another degree of freedom to the microgrippers, which allows them to rotate in x-z or y-z plane to neutralize the angle between the fiber and the horizontal line.

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Influence of surface roughness on wet adhesion of biomimetic adhesive pads with planar microstructures

Cited by 17 publications

References 20 publications

Switchable Adhesion of Micropillar Adhesive on Rough Surfaces

Switchable Adhesion of Micropillar Adhesive on Rough Surfaces

Recent progress of tree frog toe pads inspired wet adhesive materials

Releasing tool-adhered natural fibrous microscale objects with vacuum system

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