Contact angle hysteresis: a molecular interpretation

Journal Article · Sun Jun 01 04:00:00 EDT 1980 · J. Colloid Interface Sci.; (United States)

DOI:https://doi.org/10.1016/0021-9797(80)90465-8· OSTI ID:5393005

Schwartz, A M

Contact angle hysteresis in solid-liquid-fluid systems has been explained on the basis of surface roughness, surface heterogeneity, and in certain special cases by penetration of the liquid into the solid surface. However, there are many nonpenetrated solid surfaces that show no hysteresis with certain liquid-fluid pairs but considerable hysteresis with other liquid-fluid pairs having comparable molecular volumes. For experimentation on contact angles such surfaces must be regarded as smooth and homogeneous, at least to liquids in the stipulated range of molecular volume. Any contact angle hysteresis in systems that meet these criteria of smoothness and molecular volume is referred to as intrinsic hysteresis. This work proposes an explanation of intrinsic hysteresis that is in accord with thermodynamic and mechanical principles, and whose validity can be explored experimentally.

• OSTI ID: 5393005
• Journal Information: J. Colloid Interface Sci.; (United States), Journal Name: J. Colloid Interface Sci.; (United States) Vol. 75:2; ISSN JCISA
• Country of Publication: United States
• Language: English

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