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- W1972144686 abstract "The properties of particle-stabilized emulsions, especially with regard to phase inversion, are very dependent on the contact angle that the particles experience at the oil−water interface. For the very small particles used for such emulsions (often a few tens of nm), it is impossible to measure this contact angle directly. Its value could be calculated if it were possible to determine the components of the solid surface free energy. To establish a method suitable for such particles, we have investigated the imbibition of five probe liquids into a porous bed of silica (commercial TLC plates) using the thin-layer wicking technique. For all liquids, the difference between wicking rate for bare plates and for those pre-contacted with the vapors is large but it is not due to an advancing angle effect on bare plates. Our analysis shows that it is due to the diversion of flowing liquid into blind pores which are already filled in the pre-contacted case. Thus a new model is proposed describing wicking in a porous medium with very small blind pores by introducing a parameter into the Washburn equation that corrects for this capillary condensation effect. The parameter needed is determined independently using gravimetric adsorption measurements. When this modified Washburn equation is used, the difference between advancing and receding contact angle is actually quite small. When the averages are used as the Young's contact angles, values for the surface energy components of silica are obtained that are completely consistent between the five liquids and have magnitudes expected for this type of silica surface." @default.
- W1972144686 created "2016-06-24" @default.
- W1972144686 creator A5026099479 @default.
- W1972144686 creator A5027154272 @default.
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- W1972144686 date "2005-08-01" @default.
- W1972144686 modified "2023-10-12" @default.
- W1972144686 title "Determination of Contact Angles on Microporous Particles Using the Thin-Layer Wicking Technique" @default.
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- W1972144686 doi "https://doi.org/10.1021/la0510578" @default.
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