Enhanced Skin Adhesive Patch with Modulus‐Tunable Composite Micropillars

Bae, Won‐Gyu; Kim, Doogon; Kwak, Moon Kyu; Ha, Laura; Kang, Seong Min; Suh, Kahp Y.

doi:10.1002/adhm.201200098

Cited by 149 publications

(76 citation statements)

References 29 publications

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“…Biomedical structured synthetics, therefore, have been made and tested specifically for soft substrates, an area in which there have been no targeted gecko studies. Both unstructured and structured synthetic adhesives have been designed for use on skin and biological tissue192021. Biological tissues are challenging substrates, as they typically exhibit both roughness and softness, in addition to operating in wet environments.…”

mentioning

confidence: 99%

“…Increasing the pillar aspect ratio improves pillar adhesion to skin over a flat, unstructured adhesive; however, if the aspect ratio is too high, bundling occurs20. To improve contact with the surface, the entire pillar’s modulus can be reduced19. Alternatively, a high modulus pillar can be terminated with a low modulus tip, allowing for overall strength while maintaining high surface contact20.…”

mentioning

confidence: 99%

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Influence of substrate modulus on gecko adhesion

Klittich

Wilson

Bernard

et al. 2017

Sci Rep

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The gecko adhesion system fascinates biologists and materials scientists alike for its strong, reversible, glue-free, dry adhesion. Understanding the adhesion system’s performance on various surfaces can give clues as to gecko behaviour, as well as towards designing synthetic adhesive mimics. Geckos encounter a variety of surfaces in their natural habitats; tropical geckos, such as Gekko gecko, encounter hard, rough tree trunks as well as soft, flexible leaves. While gecko adhesion on hard surfaces has been extensively studied, little work has been done on soft surfaces. Here, we investigate for the first time the influence of macroscale and nanoscale substrate modulus on whole animal adhesion on two different substrates (cellulose acetate and polydimethylsiloxane) in air and find that across 5 orders of magnitude in macroscale modulus, there is no change in adhesion. On the nanoscale, however, gecko adhesion is shown to depend on substrate modulus. This suggests that low surface-layer modulus may inhibit the gecko adhesion system, independent of other influencing factors such as macroscale composite modulus and surface energy. Understanding the limits of gecko adhesion is vital for clarifying adhesive mechanisms and in the design of synthetic adhesives for soft substrates (including for biomedical applications and wearable electronics).

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mentioning

confidence: 99%

mentioning

confidence: 99%

Influence of substrate modulus on gecko adhesion

Klittich

Wilson

Bernard

et al. 2017

Sci Rep

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“…a compliant and rough surface. 31 However, the underlying adhesion mechanism of composite fibrils on rough substrates is only poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates

Fischer

Arzt

Hensel

2016

ACS Appl. Mater. Interfaces

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The benefits of synthetic fibrillar dry adhesives for temporary and reversible attachment to hard objects with smooth surfaces have been successfully demonstrated in previous studies. However, surface roughness induces a dramatic reduction in pull-off stresses and necessarily requires revised design concepts. Toward this aim, we introduce cylindrical two-phase single pillars, which are composed of a mechanically stiff stalk and a soft tip layer. Adhesion to smooth and rough substrates is shown to exceed that of conventional pillar structures. The adhesion characteristics can be tuned by varying the thickness of the soft tip layer, the ratio of the Young’s moduli and the curvature of the interface between the two phases. For rough substrates, adhesion values similar to those obtained on smooth substrates were achieved. Our concept of composite pillars overcomes current practical limitations caused by surface roughness and opens up fields of application where roughness is omnipresent.

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“…[66], [67] Electronic skin solutions to this problem have recently attracted significant interest, with surface electromyography being one of the applications targeted. [64], [68], [69] Systems capable of temperature, electrophysiological and strain sensing, that incorporate lightemitting diodes and photo-detectors, are described. [64] Solar cells and wireless antennas were mentioned as power sources.…”

Section: Printed Light Sources and Imaging Systemsmentioning

confidence: 99%

Printable Displays and Light Sources for Sensor Applications: A Review

et al. 2015

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Printed light sources, imaging systems and displays have revolutionized modern lifestyle by enriching visual feedback of various devices that human beings interact with. Despite the overall vastness of the field, there have been few to no attempts to place recent progress in these systems in sensor systems. In this short topical review, we survey the current state of art in printed light sources, imaging systems and displays specifically geared towards sensor applications. We find that the definition of displays needs to generalized in light of the availability of disposable colorimetric sensors for various chemical and biological markers. Recent exemplars of progress in each identified area are briefly presented and in conclusion, an overall view of the trends represented by these achievements is discussed.

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Enhanced Skin Adhesive Patch with Modulus‐Tunable Composite Micropillars

Cited by 149 publications

References 29 publications

Influence of substrate modulus on gecko adhesion

Influence of substrate modulus on gecko adhesion

Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates

Printable Displays and Light Sources for Sensor Applications: A Review

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