A Comparison of the Work of Adhesion Obtained from Wetting and Vapor Adsorption Measurements

Jacob, P. N.; Berg, John C.

doi:10.1080/00218469508014385

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…Further, they explained this observation by the hypothesis that small amounts of the spreading liquid, prior to spreading, will pre-wet the solid, which means that the liquid will spread over a thin layer of its own material. In the present investigation, the influence of 7r, is not considered on the basis of the conclusions of van Oss et al [5] and the lack of convenient techniques for its determination [20]. Figure 4 shows the Washburn plots for the test series of -60/+ 80 mesh spruce particles.…”

Section: Resultsmentioning

confidence: 95%

“…In cases where a liquid is forming a finite contact angle against a 'low energy' surface, it has been common to argue that ne should be neglected [ 18,19]. Jacob and Berg [20], on the other hand, state that there is a large and growing body of evidence that this assumption is wrong. Furthermore, in wicking studies using the Washburn equation, when a liquid is spreading over a solid surface the influence of Jre would mean that the assumption cos 0 = 1 is not valid.…”

Section: Resultsmentioning

confidence: 97%

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Factors influencing contact angle measurements on wood particles by column wicking

Wålinder

Gardner

1999

Journal of Adhesion Science and Technology

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The present work focuses on a capillary rise technique, referred to here as column wicking, for determining contact angles on wood particles. The liquid front rise versus time for different probe liquids has been measured for extracted and non-extracted spruce wood particles packed into glass columns. Wood is a porous, heterogeneous, and hygroscopic material. The sorption process of certain polar liquids in the wood substance, i.e. bulk sorption, is exothermic and causes swelling. This bulk sorption process and the resulting release of heat are observed as a distinct temperature increase within the columns during the wicking of water, formamide, and methanol. No temperature increase is observed for ethylene glycol, diiodomethane, and hexane. In some cases, the increase in temperature is observed in advance of the moving visible liquid front line. This may indicate that vapor is moving in advance of the liquid front, resulting in bulk sorption and the corresponding release of heat. An apparent non-linearity is observed when the square of the capillary rise is plotted versus time, mainly for water, formamide, and methanol. This non-linearity is strongly dependent on the probe liquid used and the variation in wood particle size. For the wicking of water, the bulk sorption, and hence the swelling of the wood particles, seems to appear instantaneously at the wetting front line, but for formamide and methanol a time delay is observed. The bulk sorption and resulting swelling of the wood particles strongly influence the determination of the effective interstitial pore radius between the particles, and thus the determination of contact angles by use of the Washburn equation.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 97%

Factors influencing contact angle measurements on wood particles by column wicking

Wålinder

Gardner

1999

Journal of Adhesion Science and Technology

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“…This same paper raises serious concerns about whether the assumption of a negligible equilibrium spreading pressure is appropriate. In fact, as discussed elsewhere, the equilibrium spreading pressure is never negative since vapor is adsorbed and hence this term makes the problem of a greater than 180° contact angle worse. Heat of immersion measurements for the three silicas here at 40 °C after saturation by water vapor prior to loading in the powder cell yielded heats that were not statistically different from the values for the dry samples.…”

Section: Resultsmentioning

confidence: 91%

Further Exploration of Heat of Immersion as a Method to Quantify Wettability for Particulates: Effect of Temperature

Xu,

Grady

2024

Langmuir

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A previous paper [Weston et al. Ind. Eng. Chem. Res. 2015, 54, 4274–4284] by our group concluded that to distinguish between the wettability of different particles, heat of immersion is the best method, as opposed to the Washburn or sessile drop method. In this paper, heats of immersion of three different particles with three different wettabilities are measured at different temperatures to examine one critical assumption concerning the temperature dependence of the heat of immersion. In addition, surfactants are added to the water, and the effect of surfactant concentration on the heat of immersion is measured. One particularly noteworthy aspect of the current study is that some measurements were made at temperatures greater than 100 °C and hence pressures higher than atmospheric pressure with no more difficulty than measurements made at atmospheric pressure. The previous paper showed that, for certain particles, the relationship used by us and others between the heat of immersion and contact angle gave impossible values for certain surfaces. In this paper, the derivation of that expression is reexamined, and certain assumptions are highlighted. Because of issues with the assumptions, we agree with the conclusion from our previous paper that using the heat of immersion as a qualitative measure of wetting is appropriate. However, without measurement of the values of the liquid–solid interfacial energy with temperature as well as the gas–solid interfacial energy with temperature, conversion to the contact angle directly is not appropriate. However, for the same surface, using this approach to quantify the contact angle as a function of temperature is likely appropriate if the contact angle is measured using some other method at one temperature, at least over the limited temperature range (up to 150 °C) explored in this study.

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Relevance of Film Pressures to Interfacial Tension, Miscibility of Liquids, and Lewis Acid–Base Approach

Lee¹

1999

Journal of Colloid and Interface Science

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A Comparison of the Work of Adhesion Obtained from Wetting and Vapor Adsorption Measurements

Cited by 9 publications

References 29 publications

Factors influencing contact angle measurements on wood particles by column wicking

Factors influencing contact angle measurements on wood particles by column wicking

Further Exploration of Heat of Immersion as a Method to Quantify Wettability for Particulates: Effect of Temperature

Relevance of Film Pressures to Interfacial Tension, Miscibility of Liquids, and Lewis Acid–Base Approach

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