The effect of deaeration on the surface tension of water and some other liquids

Karagianni, Mary; Avranas, Antonis

doi:10.1016/j.colsurfa.2008.11.002

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…The density is used as a target property by almost all water models, which is not surprising since 'the interactions between two effective particles depend on the overall density' [68]. The high surface tension of water compared to other liquids of similar size is directly correlated to the low aqueous solubility of nonpolar compounds and is cited as the basis for the so-called hydrophobic effect, in which nonpolar solutes and nonpolar regions of macromolecules tend to minimize their surface contact with surrounding water through self-assembly processes [74,75]. This effect drives surfactant molecules to concentrate at aqueous surfaces, or aggregate in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Exploring the utility of coarse-grained water models for computational studies of interfacial systems

Shinoda

DeVane

et al. 2010

Molecular Physics

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Molecular dynamics simulations have become a standard tool for the investigation of biological and soft matter systems. Water models serve as the basis of force fields used in molecular dynamics simulations of these systems. This article reports on an examination of the utility of a set of coarse-grained (CG) water models, with different resolutions, interaction potentials (Lennard-Jones, Morse), and cut-off distances. The relationships between the parameters under specific choices of the above options and the thermodynamic properties, such as density, surface tension, and compressibility, were found to fit simple mathematical equations. The limits of applicability of these CG water models were explored by checking the melting temperature. If a CG site is mapped to one or two real water molecules, a simple model with appropriate combinations of cut-off distances, functional forms, and parameters can be found to simultaneously match the experimental values of density, surface tension, and compressibility under ambient conditions. If more water molecules are included in a CG site, either the melting temperature approaches or surpasses room temperature, or the surface tension and compressibility cannot both be matched simultaneously. In striving for computational efficiency, it is still possible to find a simple CG water model with three water molecules contained in a CG bead that generates a liquid state of water with realistic values of density, surface tension and compressibility at ambient condition, but coarser models are not recommended.

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Section: Introductionmentioning

confidence: 99%

Exploring the utility of coarse-grained water models for computational studies of interfacial systems

Shinoda

DeVane

et al. 2010

Molecular Physics

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“…Moreover, the deaerated solutions are slightly more alkaline than aerated ones. Karagianni and Avranas [13] also observed this alkalinization in aqueous solution bubbled with nitrogen gas, due to carbon dioxide removing by nitrogen. Therefore, the formation of carbonic acid is not favorable.…”

Section: Materials and Experimentalmentioning

confidence: 85%

Theoretical and Experimental Aspects of the Corrosivity of Simulated Soil Solutions

Sena

Bastos

Platt

2012

ISRN Chemical Engineering

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Corrosion of buried steel pipe is a permanent engineering problem and, albeit the counter measures against degradation, when the corrosion process takes place, the damage has costly impact. In order to study the corrosion behavior of pipelines, it is possible to use actual soil extracts or simulated soil solutions. The extract is much related to specific sites and consequently too strict to permit a general understanding. The simulated soil presents, as advantage, its inorganic characteristic and easy preparation. In this paper, we present some theoretical results concerning the chemical equilibria of NS1, NS2, NS3, and NS4 simulated soil solutions. Besides, we have studied the effect of the above four media in corrosion behavior and polarization curves were performed for an API 5L X65 steel. The theoretical findings show that each ionic concentration varies for a 6–12 pH range. The experimental data suggested that the corrosion currents decrease as high is the pH and increase as high is the chloride content. Notwithstanding these facts, for multielectrolyte solutions, a simple correlation with a given ion is not straightforward but the complementary approaches used here give useful insights.

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“…It was found that dissolved gas in water would be the key factor affecting the wettablity, but is usually overlooked because of its low concentrations in water. Several studies have indicated the significance of dissolved gases to the properties of droplets, particles, surface forces, and protein systems. − For example, the amount of dissolved gases can affect the stability of the emulsion and the physical properties of the solvents. − Additionally, short-range attractive forces on the hydrophobic surfaces were attributed to dissolved gases adsorbed on the solid–liquid surface . Dissolved gases had also been proved to exist on the surface of oil droplets to influence the coalescence time of two nanodroplets. , When the amount of dissolved gases in oil increases, the average drainage time of coalescence decreases significantly.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Dissolved Gas on the Interfacial Properties of Decane Surface Nanodroplets

et al. 2022

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Surface nanodroplets have received extensive attention recently due to their potential in the fabrication of functional materials with nanostructures and chemical reactions at micro-and nanoscales. Although the effect of dissolved gas in water has been realized in some important processes such as spontaneous emulsification of oil droplets in water, its roles in the wetting behavior of surface nanodroplets at the hydrophobic interface have been largely neglected. Here, we focused on the influence of dissolved gas on the interfacial properties of surface nanodroplets and characterized their morphological evolution when exposed to different air-saturated water samples. Results indicated that the morphology of surface nanodroplets barely changed in airoversaturated cold water. However, their contact angle first decreases gradually in deionized water, increases immediately after replacement with degassed water, and eventually decreases gradually with time. Furthermore, the surface tension of nanodroplets would change similarly after the injection of degassed water. We considered these changes to be caused by the removal or reduction of the enriched gas at the substrate interface, in which the surface hydrophobicity was changed. Our findings could shed some light on the wetting behavior of nanodroplets at the hydrophobic surface in different air-saturated water samples and inspire the microscale manipulation and reaction of surface nanodroplets.

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The effect of deaeration on the surface tension of water and some other liquids

Cited by 8 publications

References 40 publications

Exploring the utility of coarse-grained water models for computational studies of interfacial systems

Exploring the utility of coarse-grained water models for computational studies of interfacial systems

Theoretical and Experimental Aspects of the Corrosivity of Simulated Soil Solutions

Influence of the Dissolved Gas on the Interfacial Properties of Decane Surface Nanodroplets

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