--- In
Homebrew_PCBs@yahoogroups.com, "Herbert E. Plett"
<cachureos@...> wrote:
>
> some chemist in the group? does somebody know a chemist to ask?
>
Would a chemical engineer do? We usually try to avoid chemistry
but...
IDEA ONE
Reading bits and pieces here and there (feel free to correct me but
this is BIG topic) it sounds like you want to suspend a hydrophobic
coating in water. What you need to do (I think) is create a
surfactant stabilised emulsion.
To sort this out you will need three things 1)DI water 2)a coating
(try warm wax or light molecular weight polyethelye glycol PEG ,say
300/600) 3) a non-ionic detergent and 4) a mix master.
to a lot of 1 add a little bit (1wt %) of 2, the two obviously won't
mix. Add a little of 3 again about 1 wt %. then zap with the
belnder. What you are looking for is a stable (leave it for a week
or so to test) milky white suspension. The idea is that tiny oil
droplets are now surrounded by the surfactant which allows them to
stay in the water without separating. The blender applies enough
shear to make the droplets as small as possible.
IDEA TWO
This time the idea is to chemically attach a anionic surfactant to
the copper such that the hydrophobic tail is away from the surface.
Something like sodium laurel sulfate (the stuff in shampoo) might
work. An aqueous mix (a few wt%) in DI water might print on to VERY
clean copper such that the anonic end bonds to the copper.
DISCLAIMER
It is late here and Australia lost the soccer last night so I might
not be thinking straight. These ideas may turn your printer, house
or country into a smoking heap. Test first.