Designing Robust Hierarchically Textured Oleophobic Fabrics

Kleingartner, Justin A.; Srinivasan, Siddarth; Truong, Quoc; Sieber, Michael; Cohen, Robert E.; McKinley, Gareth H.

doi:10.1021/acs.langmuir.5b03000

Cited by 26 publications

(15 citation statements)

References 42 publications

(113 reference statements)

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“…The results suggest a key role of hierarchically reentrant textures in repelling ultralow surface tension liquids (i.e. significantly reduced liquid-solid contact area favours the beading up of the liquid, which further promotes droplet rolling and bouncing with ultra-low contact angle hysteresis) [42][43][44][45][46][47] . Surface chemistry is also important.…”

Section: Hierarchical Effectmentioning

confidence: 96%

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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Section: Hierarchical Effectmentioning

confidence: 96%

Coatings super-repellent to ultralow surface tension liquids

et al. 2018

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“…The Wenzel and Cassie-Baxter models provide a mathematical description of the fully wetted and partially wetted states, and a means for predicting material wettability. Modeling studies have resulted in re-entrant topology designs that are remarkably superhydrophobic and even omniphobic [86,227–229]. However, modeling is more challenging with materials possessing variable topology such as electrospun meshes.…”

Section: Conclusion Perspectives and Future Directionsmentioning

confidence: 99%

Superhydrophobic materials for biomedical applications

et al. 2016

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Superhydrophobic surfaces are actively studied across a wide range of applications and industries, and are now finding increased use in the biomedical arena as substrates to control protein adsorption, cellular interaction, and bacterial growth, as well as platforms for drug delivery devices and for diagnostic tools. The commonality in the design of these materials is to create a stable or metastable air state at the material surface, which lends itself to a number of unique properties. These activities are catalyzing the development of new materials, applications, and fabrication techniques, as well as collaborations across material science, chemistry, engineering, and medicine given the interdisciplinary nature of this work. The review begins with a discussion of superhydrophobicity, and then explores biomedical applications that are utilizing superhydrophobicity in depth including material selection characteristics, in vitro performance, and in vivo performance. General trends are offered for each application in addition to discussion of conflicting data in the literature, and the review concludes with the authors’ future perspectives on the utility of superhydrophobic surfaces for biomedical applications.

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“…To fully understand the change in roughness and the effect on the hydrophobicity either dimensionless parameters of the fabric and coatings (Kleingartner et al, 2015) or model films can be used. Results from the latter have already been published elsewhere and they support our conclusion that the roughness of the fabric is the most important roughness contribution to the wetting properties but the submicron roughness added by the wax particles further enhance hydrophobicity of the material (Forsman et al, 2017).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

Open coating with natural wax particles enables scalable, non-toxic hydrophobation of cellulose-based textiles

Forsman

Johansson

Koivula

et al. 2020

Carbohydrate Polymers

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Designing Robust Hierarchically Textured Oleophobic Fabrics

Cited by 26 publications

References 42 publications

Coatings super-repellent to ultralow surface tension liquids

Coatings super-repellent to ultralow surface tension liquids

Superhydrophobic materials for biomedical applications

Open coating with natural wax particles enables scalable, non-toxic hydrophobation of cellulose-based textiles

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