Advancing contact angles formed by water and aqueous ethanol solutions were
measured on both bare surfaces and film-covered surfaces of acrylic, glass, hydrophilic
and hydrophobic silicon, polycarbonate, polyester, and stainless steel. Each bare surface
was initially characterized with respect to its hydrophilic - hydrophobic balance. Both
protein films and milk films were prepared on each surface; the adsorbed mass comprising
each film was measured with ellipsometry. Contact angle methods proved useful in
detecting the presence of a protein film on sufficiently hydrophilic or sufficiently
hydrophobic surfaces. Contact angle methods were also found to be useful for detecting the
presence of a milk film on sufficiently hydrophilic solid surfaces. The results also indicated
that the type of diagnostic liquid chosen for the analysis becomes an important factor for
films of increasing complexity. In any event, contact angle analysis is inappropriate to
quantify the actual mass of soil remaining on a solid surface. / Graduation date: 1991
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27098 |
| Date | 18 December 1990 |
| Creators | Yang, Jianguo |
| Contributors | McGuire, Joseph, Kolbe, Edward R. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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