Progress in Wettability Study of Reactive Systems

Komolafe, Bolarinwa; Medraj, Mamoun

doi:10.1155/2014/387046

Cited by 11 publications

(10 citation statements)

References 98 publications

(190 reference statements)

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“…Wettability can be improved either by reducing the surface tension of the liquid γ lv or by modifying the soil surface chemistry such that the surface free energy ( γ sv ) increases. Soil is rough and chemically heterogeneous, and so the true contact angle varies along the contact line (Komolafe & Medraj, ). Therefore, the term ‘apparent’ contact angle is used to describe the macroscopically measured contact angle.…”

Section: Introductionmentioning

confidence: 99%

The effect of pH modification on wetting kinetics of a naturally water‐repellent coniferous forest soil

Amer

Schaumann

Diehl

2017

European J Soil Science

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The interfacial dynamics of soil–water interactions are greatly affected by the hydrophobic properties of organic matter. The causes and underlying mechanisms responsible for the development of soil water repellency (SWR) are still under discussion. Various environmental factors control the appearance and degree of SWR. In addition to water content and temperature, the wetting of soil depends greatly on the physicochemical characteristics of soil surfaces, which in turn depend on pH. In this contribution, we propose a reaction mechanism for the change in SWR that is observed when soil pH is changed. Wetting kinetics were studied by time‐dependent sessile drop measurements (TISED) of the contact angle, the work of spreading and the diameter of the base of the drop as time elapsed under controlled relative humidity. Modification of pH strongly affected the wetting kinetics, suggesting maximum resistance to wetting at the control pH (3.6), with decreased resistance to wetting as pH was changed in either direction. The enhancement in wetting kinetics by the modification of soil pH can be attributed to the chemical modification in organic materials that coat the soil particles. This conclusion is based on the magnitude of activation energy associated with the spreading process. The combined effect of pH and temperature on the wetting kinetics, together with the compensation effect seen between the logarithmic pre‐exponential factor and activation energy, suggests acid–base catalysed hydrolysis–condensation reactions are the dominant processes responsible for the chemical nature of SWR. Highlights How does the modification of pH affect soil wetting mechanisms? The dynamic sessile drop method was used to measure the wetting activation energy. Modification of soil pH decreases resistance to wetting and increases activation energy of wetting. Acid or base catalysed hydrolysis reactions increase chemical sorption sites for water molecules in soil.

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Section: Introductionmentioning

confidence: 99%

The effect of pH modification on wetting kinetics of a naturally water‐repellent coniferous forest soil

Amer

Schaumann

Diehl

2017

European J Soil Science

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“…The compound formation observed in this work is assumed from the phase diagram of the Sn-Cu system and literatures on research related to the Cu-Sn system 14,17) . In a sessile drop method, compound formation generated by reaction of a at substrate with liquid material during wetting improves substrate wettability by a liquid material 18,19) . For complicated structures such as surface ne crevice structure and porous structures that cause capillary action, it is supposed that compound formation and growth can close the vacancies of these structures.…”

Section: Resultsmentioning

confidence: 99%

Joining of Copper Plates by Unusual Wetting with Liquid Tin and Tin–Lead Solder on “Surface Fine Crevice Structure”

et al. 2016

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“…Finally, close to 90 • the linear behavior is almost lost. The static receding contact angle of linear-like dependence, ranging between 0 • and 45 • , corresponds to a "good" wetting [10][11][12][13]. Due to the isogones' good linearization, the contact angles within the range: 0 • < θ < 45 • , will be further the main subject of our analysis.…”

Section: Theoretical Cbs Analysis and Prediction Of Their Stretching mentioning

confidence: 99%

Investigation of Single and Binary of “Sandwich” Type Convex Liquid Capillary Bridges, Stretched between Two Flat Surfaces (Experimental Approach)

Petkov

Radoev

2019

Colloids and Interfaces

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The interest to monophasic liquid capillary bridges (CB) has a long history. These shapes are attractive not only because of their interesting surface properties but also because of the possibility of their behavior to be analytically predicted by the equations of differential geometry. In the current paper we extend our previous studies by implementation of an approach for prediction of liquid gravityless CB behavior during their quasi-static stretching. It was found, that a simple linear relation, h r m ~ ln R r m , is valid the case of good wetting, 0° ≤ θ ≤ 90°, where h is the height of CB, R is the radius at the contact surface, rm is the CB waist radius, and θ is the solid/liquid (static, receding) contact angle. We experimentally studied the geometrical properties evolution of monophasic cedar oil and water CBs between two glass plates during their quasi-static (stepwise with equilibration after each step for 1–2 min.) stretching. In addition, we investigated a binary CB of a new type, resembling “sandwich”. There, due to the stronger glass wetting by the water, the oil phase is adhered at the water/gas interface, partially engulfed with a tendency to stand in the zone around the waist (minimal surface energy). During the stretching, it tends to replace the water in the CB waist region. A simple mechanism for interaction of the two immiscible liquids leading to creation of “sandwich” like binary structures, is proposed. Experiments of capillary bridges (CB) stretching between two flat surfaces have been carried for all liquids at different volume proportions. The investigation is extended also to identification of CB profile generatrix shape. We experimentally found that for monophasic CB, it can be described by a circle during the quasi-static stretching. If the CB height is increased, before the rupture, the shape evolves consecutively to an ellipse, parabola, or possibly to a hyperbola. The investigated binary CB evolves a similar way. Conclusions are drawn and directions for further investigations are given.

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Progress in Wettability Study of Reactive Systems

Cited by 11 publications

References 98 publications

The effect of pH modification on wetting kinetics of a naturally water‐repellent coniferous forest soil

The effect of pH modification on wetting kinetics of a naturally water‐repellent coniferous forest soil

Joining of Copper Plates by Unusual Wetting with Liquid Tin and Tin–Lead Solder on “Surface Fine Crevice Structure”

Investigation of Single and Binary of “Sandwich” Type Convex Liquid Capillary Bridges, Stretched between Two Flat Surfaces (Experimental Approach)

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