Omnidirectional Self-Assembly of Transparent Superoleophobic Nanotextures

Wong, William S. Y.; Liu, Guanyu; Nasiri, Noushin; Hao, Chonglei; Wang, Zuankai; Tricoli, Antonio

doi:10.1021/acsnano.6b06715

Cited by 110 publications

(98 citation statements)

References 40 publications

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“…with switchable and self-healing capabilities, but this "active" nature can reduce durability and performance of the coating over repeated cycles [26][27][28] . Diverse strategies have been reported for preparing films with properties such as transparency 25,29,30 , mechanical durability 6,27 , selfhealing 31 , or switchability of wetting states (i.e. between wetted Wenzel 32 and non-wetted Cassie-Baxter 33 states) 34 that can be sustained even when exposed to dynamic contact (e.g., strains or impinging drops) 29,35 or harsh temperatures (e.g., during freezing) 19,22,36 .…”

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confidence: 99%

Coatings super-repellent to ultralow surface tension liquids

et al. 2018

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High-performing coatings that durably and fully repel liquids are of interest for fundamental research and practical applications. Such coatings should allow for droplet beading, roll off and bouncing, which is difficult to achieve for ultralow surface tension liquids. Here, we report a bottom-up approach for preparing superrepellent coatings using a mixture of fluoro-silanes and cyanoacrylate. Upon application onto surfaces, the coatings assemble into thin films of locally multi-reentrant hierarchical structures with very low surface energy. The resulting material is superrepellent to solvents, acids and bases, polymer solutions and ultralow surface tension liquids, characterized by ultrahigh surface contact angles (>150°) and negligible roll-off angles (~0°). Furthermore, the coatings are transparent, durable and demonstrate universal liquid bouncing, tailored responsiveness and anti-freezing properties, being thus a promising alternative to existing artificial superrepellent coatings.3 Repellent coatings are of broad interest for investigating fundamental interfacial phenomena 1-4 , as well as for practical applications in areas such as self-cleaning 5-7 , chemical shielding 8 , heat transfer 3 , wet adhesives 9 , drag-reduction 10 , anti-fouling 11 , separations and membranes 12,13 , fogharvesting 14 , self-assembly 15 , and icephobicity and anti-freezing 2,16,17 . Combining sophisticated microstructures possessing reentrant 18 or double-reentrant textures 19 with low surface energy chemical modifications 20-22 result in state-of-the-art techniques for the preparation of repellent surfaces (i.e. surfaces with apparent contact angles θ * > 150°, which are considered superhydrophobic or superoleophobic for water and oil, respectively). However, engineering high-performing surfaces that are superrepellent (i.e. droplet roll-off angles ~0°) even to liquids with ultralow surface tensions (i.e. <20 mN m -1 ; e.g., n-hexane and n-pentane) remains challenging because of their low solid-liquid interfacial energy (see Supplementary Figs. 1 and 2 for detailed discussion). To date, this has only been possible using a "top-down", multi-step etching-based approach 19 , which can have limited applicability and versatility due to a lack of robustness, e.g., break-in of liquid. StrategyThe overall performance of a coating is governed by a range of properties 23 -including surface morphology, binding forces, surface chemistry, and other physical and mechanical characteristics-whereas surface repellence to liquids is primarily dependent on the surface texture and chemistry 20,24 . As these factors are interrelated, the design of simple and versatile superrepellent coatings is difficult. For example, increasing surface roughness may be used to minimize the liquid-solid contact area, which favours ultrahigh contact angles and ultralow rolloff angles. However, increased surface roughness can also compromise the transparency and durability of a coating 20,25 . Additionally, the responsiveness of a coating may enable surfaces

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Coatings super-repellent to ultralow surface tension liquids

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“…Another important issue limiting the real world impact of superoleophobic surfaces is their complicated fabrication routes and their limited transparency. Hence, Wong et al [105] presented an approach that enables the rapid, omnidirectional synthesis of flexible, and up to 99.97% transparent, superhydrophobic and oleophobic textures on many variable surface types. A three-port burner was used for the flame spray pyrolysis process.…”

Section: Flame Spray Pyrolysismentioning

confidence: 99%

“…Possessing the properties of self-cleaning and optical transparency, a thin, flexible polymeric film could be applied for light management applications and it is attractive for commercial applications in optoelectronic devices [104]. Highly-flexible superhydrophobic thin film can be used for closed-end tubes and several uneven complex geometries [105]. Similarly, displaying excellent self-cleaning and good flexibility characteristics, some polymeric films can be used for mobile phone screens [106].…”

Section: Applications Of Transparent and Flexible Superamphiphobic Sumentioning

confidence: 99%

Chemical and Physical Pathways for Fabricating Flexible Superamphiphobic Surfaces with High Transparency

et al. 2018

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Since the discovery of the self-cleaning properties of the lotus effect, the wetting of surfaces were intensively investigated due to their potential application in many industrial sectors. The transparency of flexible liquid repellent coatings are a major industrial problem and their economic consequences are widely known. Hence, a comprehensive understanding of the developments of flexible and transparent superamphiphobic surfaces is required in a number of technological and industrial situations. In this review, we aim to discuss the progress in the design, synthesis, fabrication techniques, and applications of flexible and transparent superamphiphobic surfaces. We start with an introduction, exploring the contact angles and wetting states for superhydrophilic, superhydrophobic, and superoleophobic surfaces, and continue with a review of the wetting transition of such surfaces. Then, we highlight the fabrication techniques involved for the preparation of flexible and transparent superamphiphobic surfaces. This review also discusses the key issues in the fabrication process and surfaces, and their features in improving durability characteristics and self-repellent performance. Then we suggest various recommendations for the improvement of mechanical durability along with potential future directions towards more systematic methods that will also be acceptable for industry. Finally, we conclude with some challenges and potential applications.

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“…Techniques that can control and manipulate the wettability of liquids of varying surface tension have attracted much attention because of their wide range of potential applications in chemical shielding, 1 non-wetting transparent lms, 2,3 oil transportation, 4,5 and membrane technologies. 6,7 It is straightforward to fabricate conventional superhydrophobic surfaces that repel high surface tension liquids like water; a low energy material coating on a surface with appropriate roughness is usually sufficient.…”

Section: Introductionmentioning

confidence: 99%