Upper Limits for the Contact Angles of Liquids on Solids

Shafrin, Elaine G.; Zisman, W. A.

doi:10.21236/ad0421998

Cited by 27 publications

(12 citation statements)

References 15 publications

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“…It has been argued [35,36] that the CA on a smooth surface cannot exceed certain maximum values. Since the value of the interfacial energies tensions γ SL and γ SA are limited for known materials and chemical groups, Young's equation essentially limits the CA of water (γ LA = 72 mN m −1 ) with a smooth solid surface by a maximum value close to 119 • for closest hexagonal packed −CF 3 groups of n-perfluoroeicosane, which is believed to have the lowest surface free energy.…”

Section: Hierarchical Roughness and Re-entrant Surface Topographymentioning

confidence: 99%

Why re-entrant surface topography is needed for robust oleophobicity

Nosonovsky

Bhushan

2016

Phil. Trans. R. Soc. A.

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Surface patterns affect wetting properties of solid materials allowing manipulation of the phase state of an adjacent fluid. The best known example of this effect is the superhydrophobic composite (Cassie-Baxter) interface with vapour/air pockets between the solid and liquid. Mathematically, the effect of surface micropatterns can be studied by an averaging technique similarly to the method of separation of motions in dynamics. However, averaged parameters are insufficient for robust superhydrophobic and superoleophobic surfaces because additional topography features are important: hierarchical organization and re-entrant roughness. The latter is crucial for the oleophobicity because it enhances the stability of a composite interface. The re-entrant topography can be achieved by various methods. Understanding the role of re-entrant surface topography gives us new insights on the multitude of wetting scenarios beyond the standard Wenzel and Cassie-Baxter models.This article is part of the themed issue 'Bioinspired hierarchically structured surfaces for green science'.

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Section: Hierarchical Roughness and Re-entrant Surface Topographymentioning

confidence: 99%

Why re-entrant surface topography is needed for robust oleophobicity

Nosonovsky

Bhushan

2016

Phil. Trans. R. Soc. A.

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“…123°. 14 In order to further increase the contact angle, and thus generate superhydrophobicity, the surface should be roughened through nano- or microtexturing. 15 Furthermore, in many applications, such as microfluidics and optics, the optical transmittance of materials is of utmost importance.…”

Section: Introductionmentioning

confidence: 99%

One-Step Generation of Reactive Superhydrophobic Surfaces via SiHCl₃-Based Silicone Nanofilaments

et al. 2018

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Superhydrophobic surfaces gain ever-growing attention because of their applicability in many (consumer) products/materials as they often display, among others, antifouling, anti-icing, and/or self-cleaning properties. A simple way to achieve superhydrophobicity is through the growth of silicone nanofilaments. These nanofilaments, however, are very often nonreactive and thus difficult to utilize in subsequent chemistries. In response, we have developed a single-step procedure to grow (SiHCl3-based) silicone nanofilaments with selective reactivity that are intrinsically superhydrophobic. The silicone nanofilaments could be further functionalized via Pt-catalyzed hydrosilylation of exposed Si–H moieties. These surfaces are easily obtained using mild conditions and are stable under hydrolytic conditions (neutral water, 24 h at 80 °C) while remaining highly transparent, which makes them well suited for optical and photochemical experiments.

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“…In the Zisman contact angle method [14], cosines of measured contact angles are plotted against solution surface tension ( LV ) and the intercept of this line at the x-axis (for cos =1 or  = 0) is  c . As seen from Figure 1, the liquid spreads on the solid (mineral) at  c  LV , the liquid forms a contact angle (> 0) at  c  LV .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Critical Parameters for Wettability-Based Processes in Mineral Processing

Özkan

Duzyol

2015

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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This paper presents an evaluation of critical parameters for wettability-based processes such as flotation, shear flocculation, oil agglomeration and liquid-liquid extraction in mineral processing. 'The critical surface tension of wetting ( c )' value of minerals has crucial importance in these processes. Also, 'the critical solution surface tension for oil agglomeration ( c-a )' and 'the critical solution surface tension for liquidliquid extraction ( c-e )' parameters, which are slightly higher than the  c value of the mineral, exist for achieving the oil agglomeration and liquidliquid extraction techniques. In the case of three-phase systems composed of solid, liquid/medium and oil such as oil agglomeration and liquidliquid extraction techniques, there is a second critical parameter based on the oilliquid interfacial tension (γ OL ) which are 'the critical oilliquid interfacial tension for oil agglomeration, γ cOLa ' and 'the critical oilliquid interfacial tension for liquidliquid extraction, γ cOLe ', respectively.

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Upper Limits for the Contact Angles of Liquids on Solids

Cited by 27 publications

References 15 publications

Why re-entrant surface topography is needed for robust oleophobicity

Why re-entrant surface topography is needed for robust oleophobicity

One-Step Generation of Reactive Superhydrophobic Surfaces via SiHCl₃-Based Silicone Nanofilaments

Evaluation of Critical Parameters for Wettability-Based Processes in Mineral Processing

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Upper Limits for the Contact Angles of Liquids on Solids

Cited by 27 publications

References 15 publications

Why re-entrant surface topography is needed for robust oleophobicity

Why re-entrant surface topography is needed for robust oleophobicity

One-Step Generation of Reactive Superhydrophobic Surfaces via SiHCl3-Based Silicone Nanofilaments

Evaluation of Critical Parameters for Wettability-Based Processes in Mineral Processing

Contact Info

Product

Resources

About

One-Step Generation of Reactive Superhydrophobic Surfaces via SiHCl₃-Based Silicone Nanofilaments