On vrijdag, maa 21, 2003, at 17:05 Europe/Amsterdam, Mark Klemick wrote:
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--- Wes Wada <> wrote:the March-April issue of California Fly Fisher magazine....article by Ralph and Lisa Cutter, which is the best I have ever read on
the whole subject of surface tension of water and how it traps bugs
above and in particular just below the film.
Wes -- this is a favorite subject of mine and I'm very interested but I have
no access to that magazine. Would it be practical for you to copy the article
and send it to me? I would really be grateful...
Especially if they talk about surface energy at all... Very few writers will
address that part of the equation. The way I understand it inherent molecular
energy of a surface entering or leaving the water tends to overcome the water
molecules' self-attraction. That self attraction underlies the 'film' and its
properties. Apparently, materials with greater surface energy have much better
'wetting' characteristics, that is, fluids don't tend to bead-up on them, but
readily spread out.
This suggests that Gink has low surface energy and Xink has high energy, like
most surfactants. But that's just my interpretation and I'm curious if it's
true.
Surfactants lower the surface tension of water, due to their aggregation at the water/air boundary layer, thereby displacing some (or all) of the high cohesion (strong intermolecular attraction) water molecules with much lower cohesion molecules. As an aside, simple electrolytes (dissociating salts) will actually increase the cohesion, thereby increasing surface tension (slightly).
Wettable surfaces have surface layers that have 'strong' adhesion with water, i.e. interaction with water molecules that are in the same range as or stronger than the interaction between water molecules.
==========================Heisenberg was right!======================== | Dr. Henk J.M. Verhaar | | | Environmental Fate and Ecotoxicology Specialist | | Fly Tier | | | Stichts End 17 | e-mail: [EMAIL PROTECTED] | | NL-1244 PK Ankeveen | phone: +31 35 656 2128 | | the Netherlands | ICQ: 15727113 | ==========================Uncertainty happens!=========================
