Smart Copolymer-Functionalized Flexible Surfaces with Photoswitchable Wettability: From Superhydrophobicity with “Rose Petal” Effect to Superhydrophilicity

Zong, Chuanyong; Hu, Manman; Azhar, Umair; Chen, Xu; Zhang, Yabin; Zhang, Shuxiang; Lu, Conghua

doi:10.1021/acsami.9b07767

Cited by 59 publications

(50 citation statements)

References 71 publications

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“…This reversible trans-cis photo-isomerization of azobenzene molecules endowed the azo-containing polymers with various intriguing light-responsive behaviors (e.g., in the current case, photo-soening and photo-triggered stress relaxation), which resulted in the phototunable transformation of wrinkles on the surface of the azobenzene-containing epoxy-based oligomer wrinkle-forming lm (for a detailed discussion, see the following section). [27][28][29][30] Due to the intrinsic surface instability of the rigid thin lms, surface wrinkling took place ubiquitously and spontaneously on these lms when they were placed on an elastomeric substrate, as a result of the out-of-plane displacement and once the stimulus-induced compressive strain or stress (s) exceeded the lm/substrate system-dened critical wrinkling value (s c ). 31,32 As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Light-printable epoxy oligomer wrinkle-forming surface for rewritable information storage

Azhar

Chen

et al. 2020

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Light-printable epoxy oligomer wrinkle-forming surface for rewritable information storage

Azhar

Chen

et al. 2020

RSC Adv.

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“…When water was released on the under-oil sample, R 1 < R 2 , which renders F shape as the driving force. Because the laser treated surface is underoil superhydrophilic, both θ r and θ a can be taken as 0°, which produce F res close to zero according Equation (8). The resistant force F D hinders the motion of water, and can be expressed as…”

Section: Directional Self-transportmentioning

confidence: 99%

“…Millions of years of natural selection and evolution have given rise to biological surfaces with multifunctional gradients to meet the challenges of harsh living environments. [1][2][3][4][5][6][7][8][9] A species of beetle in the Namib Desert possesses a wettability gradient enabling it to capture water from air. [10] This wettability gradient arises from a series of hydrophobic/hydrophilic patterns on its back.…”

Section: Introductionmentioning

confidence: 99%

Laser Fabrication of Bioinspired Gradient Surfaces for Wettability Applications

Yin

Xiao

et al. 2021

Adv Materials Inter

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materials with gradients inspired by biological surfaces has therefore attracted much interest. Strategies for preparing gradient surfaces include vapor-phase diffusion, gradual immersion, electrochemical oxidation, and photolithography that have broadly adopted. [20-26] However, their material constraints, tedious and time-consuming processes, and their single-pattern limit their widespread use. Developing a substrate-independent, facile and efficient, pattern-diverse method for preparing gradient surfaces would aid fundamental science and practical application. Among various techniques, laser processing has recently emerged as a powerful tool in integratedoptics and biomimetic micro-nanodevices. This technology can be used to precisely control the preparation of micro/nanoscale structures on various substrates such as metals, glass, ceramics, and polymers. [27-33] Besides, the high energy density of lasers allows the machining process to be completed quickly and efficiently. Combining laser machining with computer-aided control allows laser ablation parameters to be precisely controlled, including the processing position, scanning speed, scanning interval, and scanning track. Laser processing can therefore be used to produce flexible and diverse patterns in complex workpieces. And laser micro/nano fabrication has been applied to regulate surface wettability. [34-43] Therefore, laser processing has great potential for developing samples with different wettability and geometries on various materials. This review discusses laser fabrication of bioinspired gradient surfaces for wettability applications, whose overview is shown in Figure 1. The related backgrounds including gradient surfaces in natural creatures, the theoretical basis of wettability, and the distinct characteristics of laser processing are introduced. Gradient surfaces can be classified into wettability gradients and geometric gradients, and they are discussed in terms of various laser fabrication approaches and wettability applications. It is worth mentioning the definition of wettability gradient and geometric gradient in this review. Wettability gradient is defined as a surface with no obvious geometric change in the shape, and there is a difference of contact angles on the macro level resulting from the roughness gradient on the micro level. Geometric gradient is defined as a surface possessing significant geometric changes in the shape, but not much difference in the roughness of the entire surface at the microscopic level. Specially, a wettability gradient surface generates a water driving force as a result of its varying surface roughness. Wettability gradient surfaces can be applied in water droplet control, Inspired by nature, gradient surfaces have attracted broad research interest because of their potential in microfluidics, fog/water collection, and water electrolysis. Among the various techniques for preparing gradient surfaces, laser processing is substrate-independent, facile and efficient, patterndiverse, which can be used to prepare...

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“…To access switchable wettability via a phototrigger, fabrics were decorated with fluorinated azobenzene moieties. Upon irradiation of the surface with UV light, the azobenzene switched from its trans ‐ to cis ‐conformation and therefore surfaces changed from superhydrophobic to superhydrophilic state 117. Wettability states were fully reversible for at least 10 cycles.…”

Section: Aqueous Stimuli‐responsive Materialsmentioning

confidence: 99%

Design Principles for Aqueous Interactive Materials: Lessons from Small Molecules and Stimuli‐Responsive Systems

et al. 2020

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Interactive materials are at the forefront of current materials research with few examples in the literature. Researchers are inspired by nature to develop materials that can modulate and adapt their behavior in accordance with their surroundings. Stimuli‐responsive systems have been developed over the past decades which, although often described as “smart,” lack the ability to act autonomously. Nevertheless, these systems attract attention on account of the resultant materials' ability to change their properties in a predicable manner. These materials find application in a plethora of areas including drug delivery, artificial muscles, etc. Stimuli‐responsive materials are serving as the precursors for next‐generation interactive materials. Interest in these systems has resulted in a library of well‐developed chemical motifs; however, there is a fundamental gap between stimuli‐responsive and interactive materials. In this perspective, current state‐of‐the‐art stimuli‐responsive materials are outlined with a specific emphasis on aqueous macroscopic interactive materials. Compartmentalization, critical for achieving interactivity, relies on hydrophobic, hydrophilic, supramolecular, and ionic interactions, which are commonly present in aqueous systems and enable complex self‐assembly processes. Relevant examples of aqueous interactive materials that do exist are given, and design principles to realize the next generation of materials with embedded autonomous function are suggested.

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Smart Copolymer-Functionalized Flexible Surfaces with Photoswitchable Wettability: From Superhydrophobicity with “Rose Petal” Effect to Superhydrophilicity

Cited by 59 publications

References 71 publications

Light-printable epoxy oligomer wrinkle-forming surface for rewritable information storage

Light-printable epoxy oligomer wrinkle-forming surface for rewritable information storage

Laser Fabrication of Bioinspired Gradient Surfaces for Wettability Applications

Design Principles for Aqueous Interactive Materials: Lessons from Small Molecules and Stimuli‐Responsive Systems

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