Query regarding glass surfaces?

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I?ve got a query relating to glass surfaces.  I?ve noticed that
glaziers can fit special non-reflective glass to picture frames.  I?ve
felt the surface of this special type of glass, and it is very very
slightly rough.  It is perfectly clear and the picture can be seen
perfectly, but there is no glare or reflection visible.
I wanted to know whether or not this special type of non-reflective
glass "fogs up" in warm humid conditions.  Perhaps the slightly rough
surface may prevent condensation forming?  If a mixture of ultra fine
glass bead powder and clear acrylic lacquer (and lacquer thinners) was
sprayed evenly on a glass surface, this would result in a very fine
rough surface.  Could this possibly prevent fogging/condensation on
the surface?

Re: Query regarding glass surfaces?

Iíve got a query relating to glass surfaces.  Iíve noticed that
glaziers can fit special non-reflective glass to picture frames.  Iíve
felt the surface of this special type of glass, and it is very very
slightly rough.  It is perfectly clear and the picture can be seen
perfectly, but there is no glare or reflection visible.
I wanted to know whether or not this special type of non-reflective
glass "fogs up" in warm humid conditions.  Perhaps the slightly rough
surface may prevent condensation forming?  If a mixture of ultra fine
glass bead powder and clear acrylic lacquer (and lacquer thinners) was
sprayed evenly on a glass surface, this would result in a very fine
rough surface.  Could this possibly prevent fogging/condensation on
the surface?


There are products out there that do that, google for it.
hint: it is a liquid.  



Query regarding glass surfaces? - Anti fog products?
Green

Thanks for your reply?..and all the others.  I?m well aware there are
a whole variety of anti-fog liquids/gels/waxes available.  In fact
there?s a particular brand that I use for masks/goggles - it?s
absolutely amazing, and I swear by it.  (I?m more than happy to let
you know, but I don?t want to seem like an advertisement for them)
But what I?m trying to do is achieve a permanent effect that is 100%
effective; there already is some technology out there that does
exactly that.  Take a look:

http://www.abc.net.au/ra/innovations/stories/s1213247.htm

As fogging on glass/plastic surfaces is caused by water?s surface
tension, I thought perhaps a very slightly rough surface might help
break the surface tension of the tiny water droplets.  I?m guessing
probably not, but there?s no harm in asking.


Regards

Gas Bag

Re: Query regarding glass surfaces? - Anti fog products?
Gas Bag wrote:
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If it is a hydrated silicate surface you monolayer it with a reactive
silane, RSiX3.  -X is typically -OMe or -Cl.  R is typically a three
atom spacer then a quaternized ammonium with counterion.  That
drastically reduces the surface tension and water sheets not fogs.  
Presumably a PEO or poly(vinylpyrrolidinone) oligomer tail would also
the job.

Rain-X takes the opposite tack.  Now R is a silicone oligomer and the
treated surface is hyperhydrophobic.  Water violently beads but a
breeze blows it off.  Very nice for windshields - your wipers glide
across the surface if you need them at all.  After treatment, lightly
burnish the surface, wipe with rubbing alcohol, and burnish again.  
That gets rid of most of the residual goo.  

One wonders why competition swimmers don't "condition" their skin with
hydrophobes.  Uncoupling the otherwise wetted surface would
substantially decrease friction.

--  
Uncle Al  
http://www.mazepath.com/uncleal/
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Re: Query regarding glass surfaces? - Anti fog products?
Uncle Al wrote:

(snip)
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Now that everybody knows, we should expect pre-competition exams by
forensic dermatologists at Olympic swim meets.



Re: Query regarding glass surfaces? - Anti fog products?

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they tried this in the America's Cup sailboat races, along with something
akin to sharkskin riblets, but those ideas were quickly banned.



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