Hierarchical superhydrophobic/hydrophilic substrates based on nanospheres self-assembly onto micro-pillars

Ma, Peng‐Cheng; Wang, Yifei; Feng, Kaijun; Chen, Zhuojie; Wu, Wengang

doi:10.1088/2053-1591/1/4/045010

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…Various methods to mimic hierarchical surface morphologies can be found in the literature, for example, chemical etching techniques, − deposition of nanospheres onto microstructures, , and ultrashort pulse laser ablation. − Among all these methods, laser processing has several advantages. First of all, it is a maskless process which enables direct writing of arbitrary geometries.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Biomimetic Fog-Collecting Superhydrophilic–Superhydrophobic Surface Micropatterns Using Femtosecond Lasers

Kostal¹,

Stroj²,

Kasemann³

et al. 2018

Langmuir

164

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The exciting functionalities of natural superhydrophilic and superhydrophobic surfaces served as inspiration for a variety of biomimetic designs. In particular, the combination of both extreme wetting states to micropatterns opens up interesting applications, as the example of the fog-collecting Namib Desert beetle shows. In this paper, the beetle's elytra were mimicked by a novel three-step fabrication method to increase the fog-collection efficiency of glasses. In the first step, a double-hierarchical surface structure was generated on Pyrex wafers using femtosecond laser structuring, which amplified the intrinsic wetting property of the surface and made it superhydrophilic (water contact angle < 10°). In the second step, a Teflon-like polymer (CF) was deposited by a plasma process that turned the laser-structured surface superhydrophobic (water contact angle> 150°). In the last step, the Teflon-like coating was selectively removed by fs-laser ablation to uncover superhydrophilic spots below the superhydrophobic surface, following the example of the Namib Desert beetle's fog-collecting elytra. To investigate the influence on the fog-collection behavior, (super)hydrophilic, (super)hydrophobic, and low and high contrast wetting patterns were fabricated on glass wafers using selected combinations of these three processing steps and were exposed to fog in an artificial nebulizer setup. This experiment revealed that high-contrast wetting patterns collected the highest amount of fog and enhanced the fog-collection efficiency by nearly 60% compared to pristine Pyrex glass. The comparison of the fog-collection behavior of the six samples showed that the superior fog-collection efficiency of surface patterns with extreme wetting contrast is due to the combination of water attraction and water repellency: the superhydrophilic spots act as drop accumulation areas, whereas the surrounding superhydrophobic areas allow a fast water transportation caused by gravity. The presented method enables a fast and flexible surface functionalization of a broad range of materials including transparent substrates, which offers exciting possibilities for the design of biomedical and microfluidic devices.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Biomimetic Fog-Collecting Superhydrophilic–Superhydrophobic Surface Micropatterns Using Femtosecond Lasers

Kostal¹,

Stroj²,

Kasemann³

et al. 2018

Langmuir

164

View full text Add to dashboard Cite

show abstract

“…Соңғы онжылдықта супергидрофильдi беттердiң қолданылуы аймағының кеңеюi, соның iшiнде беттiк булануға, сұйықтардың микротамшыларын анықтауға, өздiгiнен тазартылатын беттерде қолданылу зерттеушiлердiң назарын аударуда [1][2][3]. Көптеген зерттеушiлер электролит, уақыт және кернеу сияқты анодтау параметрлерiн өзгерту арқылы беттiң морфологиясын оңай басқара отырып, анодты алюминий оксидiнiң ылғалдануқасиетiнзерттеуге тырысты [4 -6].…”

Section: кIрiспеunclassified

Superhydrophilic properties of aluminum oxide nanofibers

Kadir¹,

Nurman²,

Alpysbayeva³

et al. 2021

bulphys

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The article considers structural properties of aluminum oxide nanofibers with superhydrophilic properties obtained in oxalic acid by single-stage electrochemical anodizing, whose structure differs from that of nanoporous aluminum oxide. The superhydrophilic properties of the obtained nanofibres were determined using an Ossila contact angle goniometer. It has been found that the duration of the anodisation process affects not only the nanostructure of the anodic oxide, but also the hydrophilic properties. The studies have shown that the contact angle of the nanofibres formed at 60 seconds of anodisation process decreases to 4.37 • for 10 seconds and exhibits a superhydrophilic property

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Influence of structured sidewalls on the wetting states and superhydrophobic stability of surfaces with dual-scale roughness

Zhu

et al. 2016

Applied Surface Science

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a b s t r a c tThe superhydrophobicity of biological surfaces with dual-scale roughness has recently received considerable attention because of the unique wettability of such surfaces. Based on this, artificial micro/nano hierarchical structures with structured sidewalls and smooth sidewalls were designed and the influences of sidewall configurations (i.e., structured and smooth) on the wetting state of micro/nano hierarchical structures were systematically investigated based on thermodynamics and the principle of minimum free energy. Wetting transition and superhydrophobic stability were then analyzed for a droplet on dual-scale rough surfaces with structured and smooth sidewalls. Theoretical analysis results show that dual-scale rough surfaces with structured sidewalls have a larger "stable superhydrophobic region" than those with smooth sidewalls. The dual-scale rough surfaces with smooth sidewalls can enlarge the apparent contact angle (ACA) without improvement in the superhydrophobic stability. By contrast, dual-scale rough surfaces with structured sidewalls present an advantage over those with smooth sidewalls in terms of enlarging ACA and enhancing superhydrophobic stability. The proposed thermodynamic model is valid when compared with previous experimental data and numerical analysis results, which is helpful for designing and understanding the wetting states and superhydrophobic stability of surfaces with dual-scale roughness.

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Hierarchical superhydrophobic/hydrophilic substrates based on nanospheres self-assembly onto micro-pillars

Cited by 4 publications

References 24 publications

Fabrication of Biomimetic Fog-Collecting Superhydrophilic–Superhydrophobic Surface Micropatterns Using Femtosecond Lasers

Fabrication of Biomimetic Fog-Collecting Superhydrophilic–Superhydrophobic Surface Micropatterns Using Femtosecond Lasers

Superhydrophilic properties of aluminum oxide nanofibers

Influence of structured sidewalls on the wetting states and superhydrophobic stability of surfaces with dual-scale roughness

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