Adhesive forces [Archive] - Physics Forums

Joe

May6-04, 07:52 AM

Uncle Al

May6-04, 12:22 PM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>Joe wrote:\n>\n> Is there a place where one can find the\n> adhesive force of water to various kinds\n> of materials, e.g. glass, plastic, steel\n> etc.\n>\n> Also within glass, what would be forces\n> by different glass types. e.g. soda glass,\n> flint glass etc.\n\nLook up "surface energy," "contact angle," and "wetting."\n\nThe character of the surface matters, not only its composition. The\nscale of surface roughness plus capillary attraction or exclusion\nmakes a huge difference. Surface interactions are literally that - a\nmonolayer at the surface. One can tremendously alter surface\ninteractions by adding even a sub-monolayer of different composition.\nSo, are you measuring science or trace surface contamination?\n\nThat last is no joke. Liquid silicone (polydimethylsiloxane) is the\nultimate contaminant for its incredibly low surface energy. Any area\ninto which silicone oil is introduced will be 100% contaminated\neverywhere. You cannot clean the facility thereafter; you must build\nanother.\n\n--\nUncle Al\nhttp://www.mazepath.com/uncleal/qz.pdf\nhttp://www.mazepath.com/uncleal/eotvos.htm\n(Do something naughty to physics)\n\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>Joe wrote:
>
> Is there a place where one can find the
> adhesive force of water to various kinds
> of materials, e.g. glass, plastic, steel
> etc.
>
> Also within glass, what would be forces
> by different glass types. e.g. soda glass,
> flint glass etc.

Look up "surface energy," "contact angle," and "wetting."

The character of the surface matters, not only its composition. The
scale of surface roughness plus capillary attraction or exclusion
makes a huge difference. Surface interactions are literally that - a
monolayer at the surface. One can tremendously alter surface
interactions by adding even a sub-monolayer of different composition.
So, are you measuring science or trace surface contamination?

That last is no joke. Liquid silicone (polydimethylsiloxane) is the
ultimate contaminant for its incredibly low surface energy. Any area
into which silicone oil is introduced will be 100% contaminated
everywhere. You cannot clean the facility thereafter; you must build
another.

--
Uncle Al
http://www.mazepath.com/uncleal/qz.pdf
http://www.mazepath.com/uncleal/eotvos.htm
(Do something naughty to physics)