Tilted Pillars on Wrinkled Elastomers as a Reversibly Tunable Optical Window

Lee, Elaine; Zhang, Milin; Cho, Yigil; Cui, Yue; Spiegel, Jan Van der; Engheta, Nader; Yang, Shu

doi:10.1002/adma.201400711

Cited by 123 publications

(122 citation statements)

References 41 publications

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“…[8][9][10][11][12][13] The latter perspective has enabled engineering opportunities with self-adaptive/autonomous structures in low dimensions and has implications in many different contexts such as micro-/ nanofluidics, [14][15][16] flexible electronics, [17,18] adhesion, [19,20] organic solar cells, [21] tunable optics, [22][23][24] wettability, [25][26][27] and promising methods for surface patterning. [1,[28][29][30][31] While our scientific/technical understanding has advanced, there remains much to be explored about the control of instability morphology, and in particular how to configure instabilities, such as wrinkling and creasing, to desired patterns with selective distribution covering the surface and bespoke thresholds for the formation and evolution of instabilities.…”

Section: Doi: 101002/adfm201704228mentioning

confidence: 99%

Spatially Configuring Wrinkle Pattern and Multiscale Surface Evolution with Structural Confinement

Wang

Cheewaruangroj

et al. 2017

Adv Funct Materials

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Surface elastic instabilities, such as wrinkling and creasing, can enable a convenient strategy to impart reversible patterned topography to a surface. Here the classic system of a stiff layer on a soft substrate is focused, which famously produces parallel harmonic wrinkles at modest uniaxial compression that period-double repeatedly at higher compressions and ultimately evolve into deep folds and creases. By introducing micrometer-scale planar Bravais lattice holes to spatially pattern the substrate, these instabilities are guided into a wide variety of different patterns, including wrinkling in parallel bands and star shape bands, and radically reduce the threshold compression. The experimental patterns and thresholds are enabled to understand by considering a simple plane-strain model for the patterned substrate-deformation, decorated by wrinkling on the stiff surface layer. The experiments also show localized wrinkle-crease transitions at modest compression, yielding a hierarchical surface with different generations of instability mixed together. By varying the geometrical inputs, control over the stepwise evolution of surface morphologies is demonstrated. These results demonstrate considerable control over both the patterns and threshold of the surface elastic instabilities, and have relevance to many emerging applications of morphing surfaces, including in wearable/flexible electronics, biomedical systems, and optical devices.

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Section: Doi: 101002/adfm201704228mentioning

confidence: 99%

Spatially Configuring Wrinkle Pattern and Multiscale Surface Evolution with Structural Confinement

Wang

Cheewaruangroj

et al. 2017

Adv Funct Materials

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“…Such processes arise when an elastic material is compressed beyond a critical strain either by swelling, differential growth, or mechanical forces. In engineering, similar instabilities have long been thought of as nuisances, but they have recently found applications in many different contexts including flexible electronic devices [1][2][3][4], surface patterning methods [5][6][7][8] and materials with tunable optical properties [9][10][11][12], adhesion [13][14][15], and wettability [9,16,17].…”

Section: Introductionmentioning

confidence: 99%

Post-wrinkle bifurcations in elastic bilayers with modest contrast in modulus

Auguste

Jin

Suo

et al. 2017

Extreme Mechanics Letters

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Wrinkles, folds, creases and other elastic surface instabilities play a crucial role in many systems in nature and engineering. While surface instabilities of ideal bilayer structures with large contrasts in elastic stiffness are well understood, many natural and man-made structures are far from this ideal. To better understand the behavior of systems with modest stiffness contrast, in particular their secondary post-wrinkling bifurcations, we systematically vary the modulus contrast between the film and the substrate through a combination of experiments and finite element simulations. Above a modulus contrast of about 2, but below approximately 14, wrinkles represent the primary bifurcation mode, but can undergo two distinct types of secondary bifurcations upon further compression: (1) a direct transition from wrinkles to creases, and (2) wrinkles that first undergo period doubling, followed by a transition to creases.

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“…These micropillar SMPs exhibit potential for the applications of water collection or optical devices. Nevertheless, most of the microfabrication methods on SMPs are based on expensive lithography or complicated micromolding strategy. Therefore, it is sensible to probe a microstructure with switchable wettability produced without the need of resorting to micromolding or expensive lithography strategy.…”

Section: Introductionmentioning

confidence: 99%

Honeycomb Surface with Shape Memory Behavior Fabricated via Breath Figure Process

Chen

et al. 2017

Macro Materials & Eng

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A bio‐inspired honeycomb pattern that exhibits shape memory behavior is successfully fabricated via the breath figure process. By the surface modification along with a chemical crosslinking process to enhance the recoverability, this honeycomb‐like structure with shape memory behavior is realized. The surface wettability is dependent on the surface topography controlled by the deformation of temporary shape (elliptical circle) and recovery of the permanent shape (round circle) at the microscopic scales without the need of micromolding or expensive lithography strategy. This approach opens a facile route to an efficient, inexpensive, and versatile method to prepare films with switchable wettability.

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Tilted Pillars on Wrinkled Elastomers as a Reversibly Tunable Optical Window

Cited by 123 publications

References 41 publications

Spatially Configuring Wrinkle Pattern and Multiscale Surface Evolution with Structural Confinement

Spatially Configuring Wrinkle Pattern and Multiscale Surface Evolution with Structural Confinement

Post-wrinkle bifurcations in elastic bilayers with modest contrast in modulus

Honeycomb Surface with Shape Memory Behavior Fabricated via Breath Figure Process

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