Orthogonal Control of Stability and Tunable Dry Adhesion by Tailoring the Shape of Tapered Nanopillar Arrays

Cho, Younghyun; Kim, Gyuseok; Cho, Yigil; Lee, Su Yeon; Minsky, Helen; Turner, Kevin T.; Gianola, Daniel S.; Yang, Shu

doi:10.1002/adma.201503347

Cited by 38 publications

(39 citation statements)

References 37 publications

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“…As the nanocones can be evenly compressed upon to the applied pressure and will rapidly recover to the initial state when the pressure is eliminated, the response and recovery time can be very short. Second, the good stability of the interlocked nanocones can be attributed to the fact that the base of the nanocone is much larger than the apex, thus hindering the nanocones from collapse than conventional pillar structure . In a word, the interlocked asymmetric‐nanocones can bring great benefits for a capacitive tactile sensor in terms of its sensitivity, response/recovery time, and stability.…”

Section: Resultsmentioning

confidence: 99%

Highly Morphology‐Controllable and Highly Sensitive Capacitive Tactile Sensor Based on Epidermis‐Dermis‐Inspired Interlocked Asymmetric‐Nanocone Arrays for Detection of Tiny Pressure

Niu

Gao

Yue

et al. 2019

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The tactile sensor lies at the heart of electronic skin and is of great importance in the development of flexible electronic devices. To date, it still remains a critical challenge to develop a large-scale capacitive tactile sensor with high sensitivity and controllable morphology in an economical way. Inspired by the interlocked microridges between the epidermis and dermis, herein, a highly sensitive capacitive tactile sensor by creating interlocked asymmetric-nanocones in poly(vinylidenefluorideco-trifluoroethylene) film is proposed. Particularly, a facile method based on cone-shaped nanoporous anodized aluminum oxide templates is proposed to cost-effectively fabricate the highly ordered nanocones in a controllable manner and on a large scale. Finite-element analysis reveals that under vertical forces, the strain/stress can be highly strengthened and localized at the contact apexes, resulting in an amplified variation of film permittivity and thickness. Benefiting from this, the developed tactile sensor presents several conspicuous features, including the maximum sensitivity (6.583 kPa −1 ) in the low pressure region (0-100 Pa), ultralow detection limit (≈3 Pa), rapid response/recovery time (48/36 ms), excellent stability and reproducibility (10 000 cycles). These salient merits enable the sensor to be successfully applied in a variety of applications including sign language gesture detection, spatial pressure mapping, Braille recognition, and physiological signal monitoring. Keywords anodized aluminum oxide, capacitive tactile sensors, electronic skin, highly morphology-controllable, interlocked asymmetric-nanocone arrays, P(VDF-TrFE)

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Section: Resultsmentioning

confidence: 99%

Highly Morphology‐Controllable and Highly Sensitive Capacitive Tactile Sensor Based on Epidermis‐Dermis‐Inspired Interlocked Asymmetric‐Nanocone Arrays for Detection of Tiny Pressure

Niu

Gao

Yue

et al. 2019

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199

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“…This finding offers insights into the role of optimized surfaces . Herein, by controlling the roughness, tailoring bionic nanofilms, sharpening the nanostructures, or designing proper surfaces are necessary to achieve the desired CMDSP functional surface . Recent observations verified that hierarchical SHS possess an excellent property of CMDSP .…”

Section: The Mechanisms Of Anti‐icing and Icephobicitymentioning

confidence: 98%

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

Zhang

Huang

Cheng

et al. 2017

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Ice accumulation poses a series of severe issues in daily life. Inspired by the nature, superwettability surfaces have attracted great interests from fundamental research to anti-icing and ice-phobic applications. Here, recently published literature about the mechanism of ice prevention is reviewed, with a focus on the anti-icing and ice-phobic mechanisms, encompassing the behavior of condensate microdrops on the surface, wetting, ice nucleation, and freezing. Then, a detailed account of the innovative fabrication and fundamental research of anti-icing materials with special wettability is summarized with a focus on recent progresses including low-surface energy coatings and liquid-infused layered coatings. Finally, special attention is paid to a discussion about advantages and disadvantages of the technologies, as well as factors that affect the anti-icing and ice-phobic efficiency. Outlooks and the challenges for future development of the anti-icing and ice-phobic technology are presented and discussed.

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“…Bioinspired fibrillar adhesives for attachment in dry environments (gecko-like) have been studied over the past decade using artificial micro-and nanostructured models. (14)(15)(16)(17)(18)(19)(20)(21)(22) Arrays of closely packed nanofibrils are beneficial for conformability to real, rough surfaces, making the surface apparently "soft" even if it is composed of hard fibers that are resistant to mechanical damage and wear during locomotion. (18,19) When a large amount of liquid is present at the contact interface, fibrillar surfaces are no longer effective for achieving high adhesion and friction, unless the liquid is drained from the interface by application of shear forces forming dry contacts.…”

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confidence: 99%

Hybrid Surface Patterns Mimicking the Design of the Adhesive Toe Pad of Tree Frog

et al. 2017

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Biological materials achieve directional reinforcement with oriented assemblies of anisotropic building blocks. One such example is the nanocomposite structure of keratinized epithelium on the toe pad of tree frogs, in which hexagonal arrays of (soft) epithelial cells are crossed by densely packed and oriented (hard) keratin nanofibrils. Here, a method is established to fabricate arrays of tree-frog-inspired composite micropatterns composed of polydimethylsiloxane (PDMS) micropillars embedded with polystyrene (PS) nanopillars. Adhesive and frictional studies of these synthetic materials reveal a benefit of the hierarchical and anisotropic design for both adhesion and friction, in particular, at high matrix–fiber interfacial strengths. The presence of PS nanopillars alters the stress distribution at the contact interface of micropillars and therefore enhances the adhesion and friction of the composite micropattern. The results suggest a design principle for bioinspired structural adhesives, especially for wet environments.

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Orthogonal Control of Stability and Tunable Dry Adhesion by Tailoring the Shape of Tapered Nanopillar Arrays

Cited by 38 publications

References 37 publications

Highly Morphology‐Controllable and Highly Sensitive Capacitive Tactile Sensor Based on Epidermis‐Dermis‐Inspired Interlocked Asymmetric‐Nanocone Arrays for Detection of Tiny Pressure

Highly Morphology‐Controllable and Highly Sensitive Capacitive Tactile Sensor Based on Epidermis‐Dermis‐Inspired Interlocked Asymmetric‐Nanocone Arrays for Detection of Tiny Pressure

Bioinspired Surfaces with Superwettability for Anti‐Icing and Ice‐Phobic Application: Concept, Mechanism, and Design

Hybrid Surface Patterns Mimicking the Design of the Adhesive Toe Pad of Tree Frog

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