Highly Sensitive Mechanoresponsive Smart Windows Driven by Shear Strain

Li, Jianing; Lu, Xuegang; Zhang, Yin; Ke, Xiaoqin; Wen, Xiaoxiang; Cheng, Fei; Wei, Chaoping; Liu, Yanlin; Yao, Kangkang

doi:10.1002/adfm.202102350

Cited by 24 publications

(20 citation statements)

References 45 publications

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“…[23] Mechanochromic response, that is, the change of color under stress, of wrinkled structures has been recently reported, employing various bilayer film structures. [22,24,25] The use of soft matter substrates, including elastomers, is advantageous as it readily allows optical properties to be tuned by the applied strain, by adjusting surface periodicity and amplitude, in addition to film thickness and mechanical modulus. Further, a wide range of surface patterns, including uniand multiaxial and hierarchical wrinkles, can be readily fabricated.…”

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confidence: 99%

Tunable Structural Color with Gradient and Multiaxial Polydimethylsiloxane Wrinkling

Tan

Pellegrino

Ahmad

et al. 2022

Advanced Optical Materials

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in dragonflies Rhyothemis resplendens. [20] Randomly oriented wrinkles were demonstrated to produce uniform bright structural colors with broad viewable angles, which can further be tunable using light sensitive polymers skins. [23] Mechanochromic response, that is, the change of color under stress, of wrinkled structures has been recently reported, employing various bilayer film structures. [22,24,25] The use of soft matter substrates, including elastomers, is advantageous as it readily allows optical properties to be tuned by the applied strain, by adjusting surface periodicity and amplitude, in addition to film thickness and mechanical modulus. Further, a wide range of surface patterns, including uniand multiaxial and hierarchical wrinkles, can be readily fabricated. Bilayers are generally fabricated by deposition or lamination of a thin and stiff film, typically a few 10-100 nm and GPa modulus, atop a thicker (mm) and softer (≈MPa), for instance an evaporated metal of a spun-coated glassy polymer supported by a polydimethylsiloxane (PDMS) elastomer. The mismatch in mechanical properties between films, provided that there is strong adhesion between them (to minimize delamination, crack formation, etc.), leads to surface buckling under strain. Strain can be induced thermally, by film evaporation/shrinkage, and commonly, by mechanical strain.Plasma oxidation provides a facile route to generating a thin, glass-like film onto PDMS, [26] enabling precise control of film thickness growth kinetics. [27][28][29] We have previously demonstrated the design of tunable optical gratings [30] using this method (building on the previous demonstrations with polymer bilayer laminates [31] ). The impact of the PDMS substrate thickness on the mechanochromic response of 1D plasma oxidized PDMS films has been recently reported, [32,33] and color tunability according to illumination and viewing angle examined. Recently, the incorporation of polystyrene nanoparticles and the use of wire-bar coating (yielding regular arrays) was demonstrated to produce both angle-independent and -dependent structural colors, upon plasma exposure and wrinkling. [34] In this study, we build upon the structural color and mechanochromic response exhibited by 1D plasma oxidized wrinkled PDMS topographies ranging from nano to the micronscale, and quantitatively examines the emergence of color mixing, by superposition of diffraction orders of distinct colors at similar observation angles. We then quantify the joint roles of amplitude and periodicity in color brightness, and finally consider The generation of structural color from wrinkled polydimethylsiloxane (PDMS) surfaces, fabricated by plasma exposure, subjected to uni-and multi-axial, and sequential strain fields is examined. The approach is based on the well-known, mechanically-induced, buckling instability of a supported bilayer, whereby the top glassy "skin" is formed by plasma oxidation. Surface periodicities 200 nm ≲ d ≲ 3 μm, encompassing the visible spectrum, are investigated in terms of the obs...

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confidence: 99%

Tunable Structural Color with Gradient and Multiaxial Polydimethylsiloxane Wrinkling

Tan

Pellegrino

Ahmad

et al. 2022

Advanced Optical Materials

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“…When the strain is applied, Fe 3 O 4 @SiO 2 nanochains tilt along the shearing direction, which enables a good shielding effect. Critically, a quite small shear displacement up to 1.5 mm applied on the surface will give rise to tunable optical states, changing from the high transparency state of 65% transmittance to the opaque state of 10% transmittance [ 42 ]. In Figure 5 c, Zhao et al designed and fabricated a stretchable photonic crystal via nanoimprinting technology.…”

Section: Structures Of Mechanoresponsive Smart Windowsmentioning

confidence: 99%

“… Mechanoresponsive smart windows with dynamic control of interface parameters: ( a ) colloidal particle spacing [ 41 ] Copyright 2018, American Chemical Society, ( b ) colloidal particle direction [ 42 ] Copyright 2021, John Wiley and Sons, ( c ) spacing and shape of hole [ 17 ] Copyright 2019, Iop Publishing (Bristol, UK). …”

Section: Figurementioning

confidence: 99%

Review on Mechanoresponsive Smart Windows: Structures and Driving Modes

et al. 2023

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The growing awareness about the global energy crisis and extreme weather from global warming drives the development of smart windows market. Compared to conventional electrochromic, photochromic, or thermochromic smart windows, mechanoresponsive smart windows present advantages of simple construction, low cost, and excellent stability. In this review, we summarize recent developments in mechanoresponsive smart windows with a focus on the structures and properties. We outline the categories and discuss the advantages and disadvantages. Especially, we also summarize six unconventional driving modes to generate mechanical strain, including pneumatic, optical, thermal, electric, magnetic, and humidity modes. Lastly, we provide practical recommendations in prospects for future development. This review aims to provide a useful reference for the design of novel mechanoresponsive smart windows and accelerate their practical applications.

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“…Another kind of smart window using mechanical strain materials mainly changes the switchable optical characteristics caused by surface instability (wrinkle, bending). This material has been extensively studied because of its fast response, simple structure and low cost [ 12 , 13 ]. However, the durability of mechanical discoloration materials still exposes great problems, which also limits its industrial development.…”

Section: Introductionmentioning

confidence: 99%