Photo-modulations of surface wrinkles formed on elastomer sheets

Seki, Takahiro; Yamaoka, Daichi; Takeshima, Takahiro; Nagashima, Yuki; Hara, Mitsuo; Nagano, Shusaku

doi:10.1080/15421406.2016.1277329

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…From the trans (elongated) to the cis (bent) state, the molecular length changes from 9 to 5.5 Å. Based on this reaction, Seki et al have demonstrated 2D dynamic surfaces that alternate their morphology in the x–y plane of a Langmuir monolayer by attaching azobenzene to a polymer chain . Here, we concentrate on bringing surface topographies to a third dimension that protrudes from the LCN coating surface.…”

Section: Light‐responsive Liquid Crystal Networkmentioning

confidence: 97%

Surface Dynamics at Photoactive Liquid Crystal Polymer Networks

Liu

2019

Advanced Optical Materials

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creating insulation under cold conditions and emitting evaporable liquid when it is warm. [1][2][3] Peacock feathers, wings of certain butterflies, and plants exhibit color by means of structural color to communicate attraction or, inversely, repulsion. Often, the colors originate from periodic structures on or under a surface, thus benefiting from the interplay of light and diffractive effects.A surface is the outermost layer of matter and therefore is primarily perceived by humans upon touch or vision. Surfaces provide perceptible information by not only shape, color, and/or reflective properties but also how the matter feels upon touch, e.g., smooth or rough. Welldocumented static structures have been reported for haptic applications. [4] Studies have suggested that humans can distinguish changes in topographical dimensions down to nanometers. [5] Additionally, a surface is the first contact between objects of matter, either of the same object or that of another origin. Surfaces facilitate man-machine interactions, [6] either by touch (smooth, rough, heat conductive, etc.) or by vision (scattering, specular reflection, printed information, etc.). [7][8][9] In relation to this function, tribological properties such as friction, stick, and adhesion coefficients also find application in the field of haptics, where robotic manipulation is of importance. In contrast to nature, the surface structures in modern man-made technology are often still static. Mimicking the lotus flower, surfaces with artificially formed micrometer-sized structures that are produced by lithography or micromachining have been made, and they indeed show improved cleaning under rainy conditions. However, one expands the surface function when these structures are made dynamic, rather than static, for example, the surface would be able to remove dirt under dry conditions, as well. In the case of topographies for haptic use, man's sensitivity could be enhanced when the corrugations are moving with a frequency tuned to the maximum sensitivity of humans. However, only a few publications have described dynamic structures to enhance human-surface interactions, which could even help visually disabled people. Moreover, in an advanced technology such as microfluidics, the low Reynolds number prohibits turbulent mixing of fluid components. Mixing can be induced by surface topographical structures in the microchannels to increase the contact area and the contact time between the reagents. The microfluidic functionality would be enhanced if the topography of its inner walls could be switched in a dynamic way, e.g., to decide on the exact location and time that switching The field of advanced and responsive soft materials is at the edge of a new era. After several decades during which liquid crystals generated new functions for information displays and could solve many problems in emerging fields such as (tele)communications, this material system is being utilized to reach out to completely new application fields with functions that can take over biologica...

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Section: Light‐responsive Liquid Crystal Networkmentioning

confidence: 97%

Surface Dynamics at Photoactive Liquid Crystal Polymer Networks

Liu

2019

Advanced Optical Materials

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“…This method allows to directly capture the movement that occurred in substrate instead of polymer-azo film. The commonly employed method in literature to record wrinkle erasure has been the optical microscope, [1,2,12,21,36] which generally captures the overall behaviour of the whole sample from the top view and does not elucidate the movement at the interface of the two materials in the double layer system. By adopting confocal microscopy, both fluorescent and transmitted channels can be simultaneously observed (shown in Figure S4), thus, the movement transfer between photoactive and passive layers can be directly followed.…”

Section: Influence Of Chromophore Concentration and Polymer Backbonementioning

confidence: 99%

“…Photo-responsive wrinkle patterns have attracted great interest because photoactive materials can enable dynamic control of surface topographies, leading to broad applications, for instance, in microfabrication, in dynamic templated self-assembly, as well as in smart surfaces with adjustable adhesion, friction, wettability, and optical properties. [1][2][3][4][5][6] Furthermore, wrinkled patterns have been advantageous in designing stretchable electronic and advanced optical devices. [7][8][9][10] These patterns can be easily generated by combining a rigid top layer with a soft substrate.…”

Section: Introductionmentioning

confidence: 99%

In‐situ Monitoring of Photocontrollable Wrinkle Erasure in Azobenzene‐based Supramolecular Systems

et al. 2023

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In this contribution, dynamic photoinduced wrinkle erasure enabled by photomechanical changes in supramolecular polymer‐azo complexes was characterized via confocal microscopy. Different photoactive molecules, disperse yellow 7 (DY7) and 4,4′‐dihydroxyazobenzene (DHAB), were compared to 4‐hydroxy‐4′‐dimethylaminoazobenzene (OH‐azo‐DMA). The characteristic erasure times of wrinkles were quickly assessed by using an image processing algorithm. The results confirm that the photoinduced movement on the topmost layer can be successfully transferred to the substrate. Furthermore, the chosen supramolecular strategy allows decoupling the effect of molecular weight of the polymer and photochemistry of the chromophore, allowing quantitative comparison of wrinkling erasure efficiency of different materials and providing a facile way to optimize the system for specific applications.

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“…Especially, smart surfaces with photo‐responsive wrinkling patterns have gained extensive interest of researchers owing to the utilization of light as a fascinating stimulus that can be manipulated remotely, locally and instantaneously. To date, photo‐responsive materials, such as azobenzene‐containing polymers, [ 40‐41 ] photodimerizable polymers [ 42‐43 ] as well as photodegradable polymers, [ 44 ] have been widely used for the preparation of smart wrinkling surfaces. In our previous work, we have used azobenzene‐containing amorphous polymer to fabricate optical reversible wrinkling patterns for applications in information storage and light‐responsive soft photonics.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Light‐Responsive Polyblend Films with Reconfigurable Surface Micropatterns as Rewritable Information Storage Media

et al. 2022

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Comprehensive Summary Stimulus‐sensitive surfaces with tunable morphologies exhibit a wide range of applications in the fields of surface science and engineering. Herein, a cost‐effective yet practical strategy is proposed to fabricate photo‐sensitive patterning surface on film/substrate wrinkle system based on an azo‐containing polyblend. By manipulating the stress field of the bilayer system globally and/or locally upon the stress relaxation triggered by the reversible cis‐trans isomerization of the azobenzene, heating/cooling triggered surface wrinkles on the polyblend films could be tailor‐made with visible‐light‐irradiation. Notably, upon selective photo‐irradiation, bespoke surface patterns may be cyclically generated or eliminated, allowing these reconfigurable patterned polyblend surfaces to be used as rewritable information storage media for non‐ink printing. The as‐prepared photo‐printed information patterns with high‐resolution are shown to be rewritable for multiple cycles and legible for over 90 d in dark ambient conditions. This study not only provides a versatile strategy for flourishing the stimulus‐sensitive systems, but also sheds light on the stress relaxation‐triggered morphological evolution of the wrinkling polyblend films.

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Photo-modulations of surface wrinkles formed on elastomer sheets

Cited by 8 publications

References 32 publications

Surface Dynamics at Photoactive Liquid Crystal Polymer Networks

Surface Dynamics at Photoactive Liquid Crystal Polymer Networks

In‐situ Monitoring of Photocontrollable Wrinkle Erasure in Azobenzene‐based Supramolecular Systems

Light‐Responsive Polyblend Films with Reconfigurable Surface Micropatterns as Rewritable Information Storage Media

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