What Do We Need for a Superhydrophobic Surface? A Review on the Recent Progress in the Preparation of Superhydrophobic Surfaces

Li, Xuemei; Reinhoudt, David N.; Crego‐Calama, Mercedes

doi:10.1002/chin.200744242

Cited by 225 publications

(327 citation statements)

References 73 publications

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“…We found that for water-glycerol mixtures ranging from 0 to 40 wt.% glycerol, impacting viscous droplets are repelled in a pancake shape by the T-PTFE surface architecture for 10 We  . These water-glycerol mixtures correspond to a range of 1 Interestingly, at high viscosities (80 wt.% glycerol in the aqueous solution), droplets were no longer bouncing on the S-PTFE surface, but remained immobile on it after impact as shown in Figure 3(d). Thus, the T-PTFE architecture provides both drastically reduced contact times for viscous droplets up to 0.013 Oh  and improved repellency of impacting droplets at 0.21 Oh  compared to the S-PTFE reference surface.…”

Section: For 10mentioning

confidence: 99%

3D-Printed Surface Architecture Enhancing Superhydrophobicity and Viscous Droplet Repellency

Graeber

Kieliger

Schutzius

et al. 2018

ACS Appl. Mater. Interfaces

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Macro-textured superhydrophobic surfaces can reduce droplet-substrate contact times of impacting water droplets; however, surface designs with similar performance for significantly more viscous liquids are missing, despite their importance in nature and technology such as for chemical shielding, food staining repellency, and supercooled (viscous) water droplet removal in anti-icing applications. Here, we introduce a deterministic, controllable and up-scalable method to fabricate superhydrophobic surfaces with a 3D-printed architecture, combining arrays of alternating surface protrusions and indentations. We show a more than threefold contact time reduction of impacting viscous droplets up to a fluid viscosity of 3.7 mPa s  , which equals 3.7 times the viscosity of water at room temperature, covering the viscosity of many chemicals and supercooled water. Based on the combined consideration of the fluid flow within and the simultaneous droplet dynamics above the texture, we recommend future pathways to rationally architecture such surfaces, all realizable with the methodology presented here.

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Section: For 10mentioning

confidence: 99%

3D-Printed Surface Architecture Enhancing Superhydrophobicity and Viscous Droplet Repellency

Graeber

Kieliger

Schutzius

et al. 2018

ACS Appl. Mater. Interfaces

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“…In the past years, a large number of methods such as laser or plasma etching, physical or chemical vapor deposition, phase separation, electrostatic spinning, and spraying have been explored to prepare super-hydrophobic surfaces. [15][16][17][18][19][20][21] However, most of these techniques require severe conditions, expensive materials and/or complicated processes. Thus, sol-gel method is an alternative process with advantages that allow obtaining high quality materials of high purity, on a large scale, at low cost, and with simple equipment.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic and oleophobic sol‐gel coatings on glass substrates for usage at high temperatures

Özmen

Durán

Castro

2018

Int J of Appl Glass Sci

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The paper reports an optimized process to obtain transparent and highly hydrophobic sol‐gel coatings with further oleophobic behavior at high temperatures. Polyorganosiloxane sols were prepared incorporating an organic based precursor, 1H,1H,2H,2H Perfluorooctyltriethoxysilane (POTS), into a silica‐based hybrid sol and deposited on soda‐lime glass‐slides. The coating surfaces show high water contact angle (WCA) around 120 ± 1° and oil contact angle (OCA) of 70 ± 1° after curing at temperatures between 350 and 400°C. The coatings thickness changed between 300 and 2000 nm depending on sol composition and curing temperature. Easy‐to‐clean tests were performed, the results showing excellent anti‐stick and easy‐to‐clean properties compared to non‐coated samples. Atomic force microscopy (AFM) revealed the presence of rippled surfaces with morphology similar to “lotus leaf surface,” this explaining the properties. These hybrid fluoroalkylsilane sol‐gel coatings are a good alternative to provide anti‐stick and easy‐to‐clean properties to glass substrates being quite easy to scale up.

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“…Over the last two decades, there has been a remarkable progress in designing and fabricating the so-called superhydrophobic surfaces, which are characterized by small-scale surface roughness that keeps the liquid interface suspended at the tips of the asperities, thus, reducing the liquid-solid contact area [1,2]. Such engineered surfaces typically exhibit large liquid contact angles, small contact angle hysteresis, low adhesion, and reduced hydrodynamic friction, which play important roles in many technological processes, including self-cleaning surfaces, such as glasses and fabrics [3], nonfouling surfaces [4], and drag reduction [5].…”

Section: Introductionmentioning

confidence: 99%

Wetting properties of structured interfaces composed of surface-attached spherical nanoparticles

Bhattarai

Priezjev

2018

Computational Materials Science

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The influence of the external pressure and surface energy on the wetting transition at nanotextured interfaces is studied using molecular dynamics and continuum simulations. The surface roughness of the composite interface is introduced via an array of spherical nanoparticles with controlled wettability. We find that in the absence of an external pressure, the liquid interface is flat and its location relative to the solid substrate is determined by the particle size and the local contact angle. With increasing pressure on the liquid film, the interface becomes more curved and the three-phase contact line is displaced along the spherical surface but remains stable due to re-entrant geometry. It is demonstrated that the results of molecular dynamics simulations for the critical pressure of the Cassie-Baxter wetting state agree well with the estimate of the critical pressure obtained by numerical minimization of the interfacial energy.

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What Do We Need for a Superhydrophobic Surface? A Review on the Recent Progress in the Preparation of Superhydrophobic Surfaces

Abstract: Progress in the Preparation of Superhydrophobic Surfaces -[150 refs.]. -(LI, X.-M.; REINHOUDT*, D.; CREGO-CALAMA, M.; Chem. Soc. Rev. 36 (2007) 8, 1350-1368; Lab. Supramol. Chem. Technol., Univ. Twente, NL-7500 AE Enschede, Neth.; Eng.) -Lindner 44-242

Cited by 225 publications

References 73 publications

3D-Printed Surface Architecture Enhancing Superhydrophobicity and Viscous Droplet Repellency

3D-Printed Surface Architecture Enhancing Superhydrophobicity and Viscous Droplet Repellency

Hydrophobic and oleophobic sol‐gel coatings on glass substrates for usage at high temperatures

Wetting properties of structured interfaces composed of surface-attached spherical nanoparticles

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