Mechanical stretch for tunable wetting from topological PDMS film

Zhao, Shuai; Xia, Hong; Wu, Dong; Lv, Chao; Chen, Qi‐Dai; Ariga, Katsuhiko; Liu, Lianqing

doi:10.1039/c3sm27871a

Cited by 37 publications

(25 citation statements)

References 27 publications

(35 reference statements)

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“…In recent years, triggered by the peculiar properties and promising functions, various ''smart'' surfaces that can respond to external stimulation (e.g., light, 87,102,136,137,[276][277][278][279][280][281][282] pH, 88,[139][140][141]283,284 temperature, 97,143,217,[285][286][287][288] electrical potential, 144,145,[289][290][291] magnetic field, [292][293][294] surface curvature, 295 density of surroundings, 90 applied force 296 ) to reversibly switch their static or dynamic wettability have been increasingly investigated. 16,297 The smart superhydrophobic or superoleophobic surfaces are the most complicated and subtle interfaces in the research field of wettability, which are usually hailed as ''the bright pearl on the imperial crown''.…”

Section: Smart Oil-wettabilitymentioning

confidence: 99%

Superoleophobic surfaces

et al. 2017

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Superoleophobicity is a phenomenon where the contact angles of various oil droplets with low surface tension on a solid surface are larger than 150°. In the past few years, there has been much growing interest in the design and application of superoleophobic surfaces. Such surfaces have great significance for both fundamental research and a variety of practical applications, including oil-repellent coatings, self-cleaning, oil/water separation, oil droplet manipulation, chemical shielding, anti-blocking, designing liquid microlens, oil capture, bioadhesion, guiding oil movement and floating on oil. Herein, we systematically summarize the recent developments of superoleophobic surfaces. This review focuses on the design, fabrication, characteristics, functions, and important applications of various superoleophobic surfaces. Although many significant advances have been achieved, superoleophobic surfaces are still in their "toddler stage" of development. The current challenges and future prospects of this fast-growing field of superoleophobicity are discussed.

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Section: Smart Oil-wettabilitymentioning

confidence: 99%

Superoleophobic surfaces

et al. 2017

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“…The soft wrinkled structure with anisotropy and stretching reversibility is confirmed to be a good choice for the mechanical regulation of wettability. [ 73–78 ] Rhee et al applied the stress to the surface of soft materials to switch the orientation of the wrinkle, thereby changing the direction of the liquid flow. [ 79 ] Inspired by this, Kwon et al proposed a simply responsive mechanical system on patterned soft surfaces to manipulate both the anisotropy and orientation of liquid wetting.…”

Section: Introductionmentioning

confidence: 99%

Large‐Range, Reversible Directional Spreading of Droplet on a Double‐Gradient Wrinkled Surface Adjusted Under Mechanical Strain

Chai

Tian

et al. 2020

Adv Materials Inter

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Dynamical regulation to unidirectional wetting has received considerable attention in recent years due to its important role in flexible electronics, microfluidics, drug transportation, and so forth. It is of great significance to prepare a surface which allows the droplet to spread directionally on it with the length of droplet reversibly fluctuated within a broad range under external stimulation. In this paper, a double‐gradient wrinkled structure is prepared by constructing the structure‐gradient pillar arrays on a mechanics‐adjusted wrinkled surface and subsequently making chemical gradient by oxygen plasma treatment. Under the synergistic effect of the structural gradient, chemical gradient, and wrinkled structure, the droplet can undergo unidirectional spreading and realize dynamic regulation of the spreading length on the flexible structure. This will provide a propagable method for the regulation of surface wetting.

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“…Another example is the utilization of mechanical stress for triggerable wettability switch . In this case, the wettability can be tuned between hydrophilicity and hydrophobicity in dependence on the changed micro/nano morphology …”

Section: Introductionmentioning

confidence: 99%

Fast and Reproducible Wettability Switching on Functionalized PVDF/PMMA Surface Controlled by External Electric Field

Guselnikova

Švanda

Postnikov

et al. 2016

Adv Materials Inter

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In this paper, the novel material with controllable wettability switching triggered by external electric field is developed. The material is based on the piezopolymer blend of poly(methyl methacrylate) (PMMA) and polyvinylidene difluoride (PVDF), grafted with various hydrophobic and hydrophilic molecules to alter the initial wettability of polymer films. Organic functional groups are grafted on the blend surface via formation of covalent bonds between PMMA and arenediazonium tosylates. The surface chemical structure and morphology of prepared samples are studied by X‐ray photoelectron spectroscopy, UV–vis, and attenuated total reflection infra red (ATR‐IR) spectroscopies, atomic force microscopy (AFM), and confocal microscopy. Attachment of gold nanoparticles to grafted thiol chemical groups is additionally used to confirm the modification procedure. Application of external stimuli in the form of the electric field leads to dramatic changes in water contact angle. Wettability switching is found to be extremely fast and completely repeatable without the destructions of the polymer film. Mechanism of switching is attributed to the morphological smoothening of piezoelectric responsible composite PVDF–PMMA under the application of external stimuli.

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Mechanical stretch for tunable wetting from topological PDMS film

Cited by 37 publications

References 27 publications

Superoleophobic surfaces

Superoleophobic surfaces

Large‐Range, Reversible Directional Spreading of Droplet on a Double‐Gradient Wrinkled Surface Adjusted Under Mechanical Strain

Fast and Reproducible Wettability Switching on Functionalized PVDF/PMMA Surface Controlled by External Electric Field

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