Extracting Scientific Value from Contact Angle Analysis of Wetting Liquids on Porous Surfaces, 2018 Advanced Coating Symposium

Wettability of surfaces is a key factor in many industrial processes, ranging from coating, gluing and printing to plant protection and the application in medicine of pharmaceutical active agents. Nearly all processes associated with continuous on-line production methods are of short timescale, and papermaking, coating, printing and converting are ready examples of this. Thus, contact behaviour on short timescales is of paramount importance, e.g. ink acceptance or rejection. Surface energy balance between the surface and the liquid is the determining factor defining either phobicity or philicity (wettability) of the surface toward the specific liquid. Usually a sessile drop method is used to determine the contact angle at the circumference wetting front between a droplet of liquid and the surface. However, on highly micro and nanoporous, being designed to absorb, for example, inkjet ink vehicle. Measuring the contact angle on an absorptive surface using an absorbing liquid involves many uncertainties as the Wenzel model for considering surface roughness or voids is not relevant for a continuous absorbing surface. For phobic surfaces, the Cassie-Baxter model naturally remains valid although the surface may be porous due to the lack of absorption. 

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Author: P.A.C. Gane, C. J. Ridgway, and D. Kisters
Extracting Scientific Value from Contact Angle Analysis of W
Extracting Scientific Value from Contact Angle Analysis of Wetting Liquids on Porous Surfaces, 2018 Advanced Coating Symposium

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