The effect of solid surface heterogeneity and roughness on the contact angle/drop (bubble) size relationship

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1994.1164· OSTI ID:7072273

Drelich, J; Miller, J D ^[1]

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1. Univ. of Utah, Lake City, UT (United States). Dept. of Metallurgical Engineering

The contact angle for varying sizes of drops and air bubbles was measured on clean, heterogeneous, and rough solid surfaces. A linear correlation of the cosine of the contact angle vs reciprocal of the drop (bubble) base radius was obtained for the tetradecane/water/quartz and air/water/polyethylene systems, in which pure single-component liquids and freshly prepared clean solid surfaces were used. It was found that solid surface imperfections, heterogeneity and/or roughness, affect the contact angle /drop (bubble) size relationship. The change in contact angle with bubble size depended on the extent of solid surface heterogeneity, as was observed for the tetradecane/water/methylated quartz system with varying degrees of quartz methylation. For the air/water/polyethylene and air/water/gold systems, it was found that the slope of a plot of cos [theta] vs 1/r increased for rough surfaces when compared to that for smooth surfaces, and that these experimental data qualitatively support the modified Wenzel equation which includes the line-tension term.

• DOE Contract Number: FC21-89MC26268
• OSTI ID: 7072273
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 164:1; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AGGLOMERATION
COLLOIDS
DISPERSIONS
EMULSIONS
FLOTATION
FOAMS
MINERALS
NUCLEATION
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OXIDE MINERALS
POLYETHYLENES
POLYMERS
POLYOLEFINS
QUARTZ
SEPARATION PROCESSES
SURFACE PROPERTIES
VAPOR CONDENSATION
WETTABILITY