High aspect ratio wrinkles on a soft polymer

Ahmed, Sk. Faruque; Rho, Geon-Ho; Lee, Kwang-Ryeol; Vaziri, Ashkan; Moon, Myoung‐Woon

doi:10.1039/c0sm00386g

Cited by 52 publications

(28 citation statements)

References 45 publications

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“…This wetting property was achieved by treating the superhydrophobic substrate with an O 2 RIE plasma to increase wettability. 35 We hypothesize that some of the largest G3 structures masked smaller G1 or G2 features in a self-shadowing effect; 36,37 hence, masked regions remained hydrophobic while those exposed to the oxygen plasma became hydrophilic. This type of selective chemical modification is unique to 3D hierarchical wrinkled substrates, and a starting 2D−2D−2D substrate with θ w > 160°c ould be continuously tuned down to 0°as O 2 plasma time increased (to ca.…”

Section: Lettermentioning

confidence: 99%

Controlled Three-Dimensional Hierarchical Structuring by Memory-Based, Sequential Wrinkling

Lee¹,

Engel²,

Huntington³

et al. 2015

Nano Lett.

111

100

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This paper describes how a memory-based, sequential wrinkling process can transform flat polystyrene sheets into multiscale, three-dimensional hierarchical textures. Multiple cycles of plasma-mediated skin growth followed by directional strain relief of the substrate resulted in hierarchical architectures with characteristic generational (G) features. Independent control over wrinkle wavelength and wrinkle orientation for each G was achieved by tuning plasma treatment time and strain-relief direction for each cycle. Lotus-type superhydrophobicity was demonstrated on three-dimensional G1-G2-G3 hierarchical wrinkles as well as tunable superhydrophilicity on these same substrates after oxygen plasma. This materials system provides a general approach for nanomanufacturing based on bottom-up sequential wrinkling that will benefit a diverse range of applications and especially those that require large area (>cm(2)), multiscale, three-dimensional patterns.

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Section: Lettermentioning

confidence: 99%

Controlled Three-Dimensional Hierarchical Structuring by Memory-Based, Sequential Wrinkling

Lee¹,

Engel²,

Huntington³

et al. 2015

Nano Lett.

111

100

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“…On polydimethylsiloxane (PDMS), Ar-ion beam irradiation would create a stiffening process on the surface by polymeric chain-scissoring process of oxygen and carbon bond, resulting in a SiO x -rich PDMS surface. A thin skin with stiffness $100 times higher than PDMS was observed in the compressive stress state [47,48]. To release the stress, the stiff Figure 4.…”

Section: Broad Ion Beam Irradiationmentioning

confidence: 99%

Janus-faced micro and nanopillars for geometry and surface chemistry controllable bioinspired dry adhesives

Rahmawan¹,

Yoon²,

Moon³

et al. 2012

Journal of Adhesion Science and Technology

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Janus-faced pillar structures are a new class of bioinspired dry adhesives based on the exploitation of unique physical and chemical properties when two different materials are placed on two opposite faces. Using Janus-faced high aspect ratio (HAR) pillars, it is possible to control the geometry and surface chemistry that are key factors in designing geckoinspired artificial dry adhesives with high performance. In this review, first, we revisit the conventional fabrication techniques for homogeneous, angled HAR structures. Second, we present the fabrication methods for Janus-faced micro and nanopillars via physical and chemical modification of one of the faces. Third, we discuss the geometric features of Janus-faced structures with bending mechanisms of the pillars and the selection of contacting faces. Finally, we cover the theoretical and practical viewpoints of adhesion behavior with a particular focus on the role of work of adhesion, tilt angle, and adhesion hysteresis. We emphasize that Janus-faced structures potentially provide powerful systems to control anisotropic adhesion behavior by taking advantage of both physical and chemical aspects of the angled structures.

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“…Protection of elastomers with diamond-like carbon (DLC) coatings has several industrial applications, like in windshield wipers, 1 ball bearings, 2 and others. [3][4][5] Such approach allows a reduction of the energetic losses due to friction and improves the lifetime of products. In addition, the use of liquid lubricants, which degrade the elastomer and which are often harmful for the environment, can be reduced or even eliminated.…”

Section: Introductionmentioning

confidence: 99%

Influence of load on the dry frictional performance of alkyl acrylate copolymer elastomers coated with diamond-like carbon films

Martínez-Martínez

Nohava

Hosson

2015

Journal of Applied Physics

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In this work, the influence of applied load on the frictional behavior of alkyl acrylate copolymer elastomers coated with diamond-like carbon films is studied at dry conditions. The performance of two coatings with very different microstructure (patched vs. continuous film) is compared with the uncoated substrate. A wide range of applied loads is explored, from 1 mN to 1 N, which is achieved by using a specific tribometer. The variation of 3 orders of magnitude in the applied load leads to a strong variation of the observed frictional phenomena. The different behavior of both samples at various loads is explained using a model that considers two contributions to the friction coefficient, namely, an adhesive and a rubber hysteresis part. The constraints and applicability of such model are critically evaluated.

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High aspect ratio wrinkles on a soft polymer

Cited by 52 publications

References 45 publications

Controlled Three-Dimensional Hierarchical Structuring by Memory-Based, Sequential Wrinkling

Controlled Three-Dimensional Hierarchical Structuring by Memory-Based, Sequential Wrinkling

Janus-faced micro and nanopillars for geometry and surface chemistry controllable bioinspired dry adhesives

Influence of load on the dry frictional performance of alkyl acrylate copolymer elastomers coated with diamond-like carbon films

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