A review of adhesion mechanisms of mushroom-shaped microstructured adhesives

Carbone, Giuseppe; Pierro, Elena

doi:10.1007/s11012-013-9724-9

Cited by 35 publications

(19 citation statements)

References 42 publications

(82 reference statements)

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“…Moreover, we investigated the thickness effect of the adhesive layer ( h a ) (Figure S5, Supporting Information for details). The uniform stress distribution at adhered interface was maximized at ≈7 of thickness ratio (TR ∼ h a /d ), which is similar to previous studies using the array of microstructures . If the adhesive layer ( h a ) is too thin, localized stresses are concentrated on the center of the adhesive, and thus the adhesive detaches easily.…”

Section: Resultssupporting

confidence: 84%

“…Interestingly, the stress profile of the SIA was mainly distributed in the central region of the patch (black line in Figure d) because the stress was delivered throughout the elongated male interlocked structures, enabling them to achieve enhanced adhesion strength. In the soft PDMS‐based patch, however, the localized stresses were concentrated on the edges of the patch (red line), resulting in relatively easy detachment via crack propagation . Additionally, we compared the experimental data with the stress profiles of various diameters of buried microstructures (10, 30, and 100 µm) as shown in Figure a,b and Figure S4 in the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

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Snail‐Inspired Dry Adhesive with Embedded Microstructures for Enhancement of Energy Dissipation

Kim

Baik

et al. 2019

Adv Materials Technologies

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reversible, and smart adhesives have been implemented in clean transfer systems on large-area glass (or wafers), [5,6] reversible attachments and fixations on various nonflat surfaces (e.g., skin and organs) for medical applications, [5,[7][8][9] and effective locomotion of medical robotics. [10,11] To improve performance and functionality, i.e., the adaptability or directionality of dry adhesion, various nanoscale geometrical and material features have been investigated for amplification of van der Waals forces or mechanical interlocking. Such examples can be found in the hierarchical and slanted microhairs of geckos, [12][13][14] interlocking nanohairs inspired by wing-locking devices of beetles, [15,16] and endoparasite-like microneedles. [17] Recently, additional rules of the 3D architectures of octopi suction cups have been unveiled to explain their enhanced wet adhesion via capillary interaction and suction effects. [5,7] While striking advances have been made in adhesive architectures created on engaged surfaces, another strategy has been investigated to improve adhesion strengths by employing an energy-dissipation layer. [18,19] According to well-established models, [18,20] the energy-dissipation layer plays a key role in improving adhesion strengths during both peel-off and pulloff detachment. In addition, employing heterogenous energydissipation layers inside the adhesives has been highlighted to improve durability and resistance against fatigue, [21] an approach different from previous studies like zip-like microstructured fasteners assisted by mechanical interlocking. [22][23][24] Very recently, versatile tough adhesives have been developed by introducing viscoelastic energy dissipation based on the hysteresis of polymer chains, wherein a tough hydrogel matrix effectively dissipates energy when the interface is stressed during detachment. [18,19] Despite their striking performance on diverse surfaces (e.g., wet and rough), hydrogel-based adhesives with chemical moieties remain challenging to apply in reversible clean-transfer/fixing devices or contamination-free skin patches because of their viscoelastic chemical residues after detachment. [18,19,25] To generate the arresting effect via an energydissipation layer without glue or chemistries, many efforts have focused on subsurface microstructures by controlling various geometries, arrangements (e.g., stripes or plaids), and viscous liquid chambers, resulting in remarkable enhancement In various organisms in nature, the energy-dissipation layers within their adhesive systems are known to play a significant role in enhancement of adhesion performance in pulling and peeling directions. Reported here is that the pedal-muscle structures of snails can be exploited to form a repeatable, microstructure-embedded adhesive, enabling enhanced adhesion in both pulling (13 N cm −2 ) and peeling (20 J m −2 ) directions with excellent repeatability (<1000 cycles). The measured adhesion strengths and energies depend on the geometrical and material parameters of the mi...

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Snail‐Inspired Dry Adhesive with Embedded Microstructures for Enhancement of Energy Dissipation

Kim

Baik

et al. 2019

Adv Materials Technologies

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“…For this scenario we obtain ≈ 200 nm, which is comparable with the upper bound for the width of a bundle, DB  100 nm. Therefore we conclude that B ⁄ ≤ 1, and, consequently, we determine that the pull-off process follows the decohesion mechanism (Carbone & Pierro, 2013), whereby:…”

Section: Accepted Manuscriptmentioning

confidence: 71%

Probing adhesion between nanoscale cellulose fibres using AFM lateral force spectroscopy: The effect of hemicelluloses on hydrogen bonding

Dolan

Cartwright

Bonilla

et al. 2019

Carbohydrate Polymers

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“…Nowadays, viscoelastic materials are widely utilized in several engineering applications, such as seals [1] and adhesives/biomimetic adhesives [2][3][4][5]. Moreover, they are object of recent research investigations, for example: (i) rolling contacts [6][7][8], (ii) sliding contacts [9][10][11][12], (iii) crack propagation [13][14][15], (iv) viscoelastic dewetting transition [16].…”

Section: Introductionmentioning

confidence: 99%

Damping control in viscoelastic beam dynamics

Pierro

2020

Journal of Vibration and Control

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Viscoelasticity plays a key role in many practical applications and in different reasearch fields, such as in seals, sliding-rolling contacts and crack propagation. In all these contexts, a proper knowledge of the viscoelastic modulus is very important. However, the experimental characterization of the frequency dependent modulus, carried out through different standard procedures, still presents some complexities, then possible alternative approaches are desirable. For example, the experimental investigation of viscoelastic beam dynamics would be challenging, especially for the intrinsic simplicity of this kind of test. This is why, a deep understanding of damping mechanisms in viscoelastic beams results to be a quite important task to better predict their dynamics. With the aim to enlighten damping properties in such structures, an analytical study of the transversal vibrations of a viscoelastic beam is presented in this paper. Some dimensionless parameters are defined, depending on the material properties and the beam geometry, which enable to shrewdly design the beam dynamics. In this way, by properly tuning such disclosed parameters, for example the dimensionless beam length or a chosen material, it is possible to enhance or suppress some resonant peaks, one at a time or more simultaneously. This is a remarkable possibility to efficiently control damping in these structures, and the results presented in this paper may help in elucidating experimental procedures for the characterization of viscoelastic materials.

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A review of adhesion mechanisms of mushroom-shaped microstructured adhesives

Cited by 35 publications

References 42 publications

Snail‐Inspired Dry Adhesive with Embedded Microstructures for Enhancement of Energy Dissipation

Snail‐Inspired Dry Adhesive with Embedded Microstructures for Enhancement of Energy Dissipation

Probing adhesion between nanoscale cellulose fibres using AFM lateral force spectroscopy: The effect of hemicelluloses on hydrogen bonding

Damping control in viscoelastic beam dynamics

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