A direct measurement of the influence of vapour, of liquid and of oriented monolayers on the interfacial energy of mica

Bailey, A.I.; Kay, Susan M.

doi:10.1098/rspa.1967.0189

Cited by 68 publications

(6 citation statements)

References 3 publications

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“…38 In fact one would expect solid-vapor interfacial energies to be smaller than their solid-vacuum counterparts, based on experimental evidences. 39 We believe that the involved interfacial energies should be of the order of 0.073 Nm −1 , the well-known value for vapor-liquid interfaces for pure water and at RT ͑surface tension͒, and well below the surface energy value of the ͑111͒ surface of BaF 2 , estimated to be 0.33 Nm −1 according to ab initio calculations. 40 As an illustrating example, just mention the case of the liquid water-ice interfacial energy, which has been experimentally determined as 0.03 Nm −1 .…”

Section: -5mentioning

confidence: 67%

Two-dimensional wetting: The role of atomic steps on the nucleation of thin water films on BaF2(111) at ambient conditions

Cardellach

Verdaguer

Santiso

et al. 2010

The Journal of Chemical Physics

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The interaction of water with freshly cleaved BaF(2)(111) surfaces at ambient conditions (room temperature and under controlled humidity) has been studied using scanning force microscopy in different operation modes. The images strongly suggest a high surface diffusion of water molecules on the surface indicated by the accumulation of water at step edges forming two-dimensional bilayered structures. Steps running along the 110 crystallographic directions show a high degree of hydrophilicity, as evidenced by small step-film contact angles, while steps running along other directions exhibiting a higher degree of kinks surprisingly behave in a quite opposite way. Our results prove that morphological defects such as steps can be crucial in improving two-dimensional monolayer wetting and stabilization of multilayer grown on surfaces that show good lattice mismatch with hexagonal ice.

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Section: -5mentioning

confidence: 67%

Two-dimensional wetting: The role of atomic steps on the nucleation of thin water films on BaF2(111) at ambient conditions

Cardellach

Verdaguer

Santiso

et al. 2010

The Journal of Chemical Physics

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“…In fluid–solid interfaces, the measurement of the interfacial tension is much more complicated, and only indirect methods have been used. These include cleavage tests for mica–water, solubility tests for quartz–water based on the Freundlich–Ostwald equation, and contact angle measurements based on Young’s equation. − …”

Section: Introductionmentioning

confidence: 99%

Calculation of Solid–Fluid Interfacial Free Energy with Consideration of Solid Deformation by Molecular Dynamics Simulations

Firoozabadi

2021

J. Phys. Chem. A

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Fluid–fluid interfacial free energy can be measured accurately and can also be calculated from molecular simulations. However, it is challenging to measure solid–fluid interfacial free energy directly. Accurate computation has not yet been advanced by molecular simulations. In this study, we derive working expressions for estimating solid–fluid interfacial free energy based on the free-energy perturbation method with consideration of solid deformation. A Lennard–Jones solid–fluid system is simulated. Our derivations indicate that the effect of solid deformation is pronounced on solid–fluid interfacial free energy, and the results may be significantly different from the conventional test area method. Our results reveal that the contribution of the solid deformation highly depends on the stress conditions in the solid, which can be either positive or negative. Adsorption of fluids onto the solid surface has a significant effect on interfacial free energy. In weak adsorption, the interfacial free energy is close to the solid–vacuum surface free energy. Strong adsorption results in a significant reduction in interfacial free energy.

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“…The role of water molecules adsorbed at the surface has been discussed by Bernett & Zisman (1968) for metals, Shafrin & Zisman (1967) for glass, Bailey & Kay (1967) for micas, and Kessaissia et al (1981) for silicas. It will be shown later how it is possible to connect Ya, Ys and li e with the clay water content.…”

Section: Water Vapour Sorptionmentioning

confidence: 99%

Measurement of the surface free energy of calcium-montmorillonite

1986

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The surface free energy of Ca-montmorillonite has been determined from measurement of the contact angle of water on an oriented deposit immersed in n-alkanes; the oriented deposits were equilibrated at different relative humidities. These experiments provided the polar, ~s, and dispersive, ~, components of the surface free energy 7s. The results indicate that: (I) ?~s is mainly due to dispersive forces (7~ -~ 145 mJ.m 2) and, to a lesser degree, polar forces (~ _~ 35 mJ.m z). (2) The value of the apparent surface free energy of the clay, y,, tends towards that measured for water when the solid water content exceeds 50 wt%. (3) The sorption of water molecules substantially modifies the surface free energy of the solid; ?s decreases from 180 mJ.m -2 to 60 mJ.m z when the water content increases from 0 to 50%. These results agree with other observations made on solids whose surface characteristics are similar to montmorillonite, i.e. micas, silicates and glasses. In addition, variations of ?s with water content can be related to the hydration processes of smectites. Finally, these results show that the silicate no longer influences the surface properties when the montmorillonite water content exceeds 60%, In order to analyse the extent to which organic compounds control clay wettability, we have measured the surface free energy of organo-mineral complexes. The organic and mineral phases were first investigated separately and then in association. In this paper we describe the surface free energy properties of calcium-montmorillonite, which is often used as a model material. THEORY Measurement of the surf ace free energy of a solidUnlike liquids, the surface free energy of solids can not be determined directly and indirect methods have had to be developed (Adamson, 1982). We chose to estimate the surface free energy of Ca-montmorillonite from contact-angle measurements of water on the clay. Since this material is a high-energy solid, the usual method in a liquidsolid-vapour system cannot be used; the solid surface is completely wetted by the liquid, the contact angle 0 then being zero. We used the alternative method developed by Tamai et al. (1967), where the vapour phase is replaced by a second liquid phase. This method has been tested by Schultz et al. (1977a,b) on high-energy solid surfaces. They used saturated hydrocarbons as a second liquid phase, which enabled them to determine finite contact angles.

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A direct measurement of the influence of vapour, of liquid and of oriented monolayers on the interfacial energy of mica

Cited by 68 publications

References 3 publications

Two-dimensional wetting: The role of atomic steps on the nucleation of thin water films on BaF2(111) at ambient conditions

Two-dimensional wetting: The role of atomic steps on the nucleation of thin water films on BaF2(111) at ambient conditions

Calculation of Solid–Fluid Interfacial Free Energy with Consideration of Solid Deformation by Molecular Dynamics Simulations

Measurement of the surface free energy of calcium-montmorillonite

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