Contact angles and surface energetics

Neumann, A. W.; Kwok, Daniel Y.

doi:10.1007/bfb0118169

Cited by 28 publications

(5 citation statements)

References 37 publications

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“…The van Oss–Chaudhury–Good method ,− is the most practical method to obtain the γ s LW , γ s ⊖ , and γ s ⊕ contributions in a solid–liquid system, and it is necessary to solve a linear relation of equations with different liquids. A multiple linear regression was made with the six liquids from Table .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The intermediate case of partial wetting occurs when γ lv > γ sv . The second is the nonwetting state when γ lv ≫ γ sv . , To obtain a measurable CA (θ ≫ 0°), the surface tension of the liquid must be higher than the solid surface tension: that is, γ lv > γ sv . , Because eq is derived from eq , the criterion for calculating surface energies implies a unique CA and no chemical/physical reactions during the experiment. ,,, The value of γ lv is assumed to be constant in these results.…”

Section: Results and Discussionmentioning

confidence: 99%

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Dependence of the Liquid Polarity in the Wetting of Rough Surface: An Effective Surface Tension Approach

2022

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Liquid and surface polarities play an important role in wetting phenomena, and this should still be true if the surface is rough. We analyze the wetting of high-polar and low-polar liquids on rough low-polar surfaces made of polystyrene. The experimental results are analyzed by the surface tension components (STC) and the equation-of-state (EQS) approaches. Both approaches predicted a clear increase of the contact angle (CA) with the surface roughness for high-polar liquids, but they failed for lowpolar liquids: STC calculations produce the wrong tendency in the total solid surface energy, and EQS is not able to fit the data for these liquids. These results show that low-polar liquids show little dependence on the roughness of a low-polar surface, while high-polar liquids are very sensitive to it. As a consequence, the calculated CAs are close to experimental values only for the high-polar liquids, while there are great differences for low-polarity liquids. Both STC and EQS approaches are able to describe the apparent CAs on polystyrene rough surfaces by using effective surface and interfacial tensions, but their effectiveness is limited to high-polarity liquids.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Dependence of the Liquid Polarity in the Wetting of Rough Surface: An Effective Surface Tension Approach

2022

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“…Experimental studies [5,10,11] have shown that the cosine of the contact angle θ of a simple molecular liquid on a given low-energy solid surface is a function of the surface tension σ lv of the liquid, i.e.,…”

Section: Brief Review Of the Zisman Equation For Wettingmentioning

confidence: 99%

“…It is known that the work of adhesion of a liquid and solid in contact, W sl , which is the work required to separate a unit area of the solid-liquid interface, is given by the Young-Dupré equation [11]…”

Section: Brief Review Of Theories Of Wetting Under Van Der Waals Forcesmentioning

confidence: 99%

Theoretical foundation of Zisman's empirical equation for wetting of liquids on solid surfaces

Zhu¹,

Cui²,

Wang³

2009

Eur. J. Phys.

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Theories of wetting of liquids on solid surfaces under the condition that van der Waals force is dominant are briefly reviewed. We show theoretically that Zisman's empirical equation for wetting of liquids on solid surfaces is a linear approximation of the Young-van der Waals equation in the wetting region, and we express the two parameters in Zisman's empirical equation in terms of the dielectric polarizabilities of the solid and liquids. The materials contained in this paper are suitable for physics teaching of wetting phenomena for undergraduate, graduate, general physicist, etc.

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“…The chemical compatibility of RDX and PETN with several polymers was evaluated according to STANAG 4147 standard “Chemical compatibility of ammunition components with explosives (non-nuclear applications)” [12] using the vacuum stability test (VST) and differential scanning calorimetry (DSC). Surface tension values of explosives and binders were determined by contact angle measurement [13,14]. Based on these surface tension values, several interfacial parameters such as an interfacial tension and the work of adhesion were determined.…”

Section: Introductionmentioning

confidence: 99%

The Chemical Compatibility and Adhesion of Energetic Materials with Several Polymers and Binders: An Experimental Study

et al. 2018

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The chemical compatibility and the adhesion of energetic materials and additive materials exert a strong influence on the sensitivity, safety and performance of a polymer-bonded explosive (PBX). In this study, the chemical compatibility of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), pentaerythritol tetranitrate (PETN) with several polymers were evaluated using the vacuum stability test (VST) and the differential scanning calorimetry (DSC); while the adhesion between RDX or PETN and each binder based on these polymers was determined through interfacial characteristics using contact angle measurement. The experimental results demonstrate that RDX and PETN are compatible with polystyrene (PS), nitrocellulose (NC) and fluoroelastomer (FKM) according to the STANAG 4147. Therefore the two polymers can be used as adhesives in PBX composition. Moreover, based on interfacial characteristics such as interfacial tension and work of adhesion, the adhesion between RDX and each binder was predicted to be better than that of PETN.

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Contact angles and surface energetics

Cited by 28 publications

References 37 publications

Dependence of the Liquid Polarity in the Wetting of Rough Surface: An Effective Surface Tension Approach

Dependence of the Liquid Polarity in the Wetting of Rough Surface: An Effective Surface Tension Approach

Theoretical foundation of Zisman's empirical equation for wetting of liquids on solid surfaces

The Chemical Compatibility and Adhesion of Energetic Materials with Several Polymers and Binders: An Experimental Study

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