| Autor: |
Y.K. Kamath, Anant D. Mahale, Sheldon P. Wesson |
| Rok vydání: |
1994 |
| Předmět: |
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| Zdroj: |
Colloids and Surfaces A: Physicochemical and Engineering Aspects. 89:133-143 |
| ISSN: |
0927-7757 |
| DOI: |
10.1016/0927-7757(94)80113-4 |
| Popis: |
We described previously a computer model for wetting hysteresis based on a theoretical analysis of the Wilhelmy wetting experiment. Applying this model to a number of virtual surfaces, we demonstrated that surface heterogeneity causes hysteresis in the wetting trace of an otherwise perfect solid. We now develop a model for the two-meniscus case to emulate liquid membrane wetting. This experiment scans a suspended solid specimen with a film of liquid contained in a loop attached to a vertical drive. After showing how variations in the size and proportion of surface energy domains affect the appearance of virtual wetting traces, we estimate the proportion of the surface covered randomly by two materials having different wettabilities, using real immersion and liquid membrane wetting data. The traces produced by the two models match the measured traces well. We are also able to mimic the effect of macroscale heterogeneity superimposed on surfaces featuring wetting hysteresis caused by microscale heterogeneity, specifically, fibers with non-uniform applications of finishing agents. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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