Ode,
Thanks for this information, which seems to be another good methodology.
We're now working up a real list of methodologies. The creation of
silver sludge, using very high voltage, etc., would seem to be
promising. Off hand what would you imagine the setup would cost? I
hear '20,000 volts,' and imagine some very beefy, expensive devices.
And when the electrodes disintegrate do they do so uniformly? I'm also
imagining there would be some big chunks of metalic silver that would
have to go back for melting and reworking.
Thanks,
Reid
Ode said:
The way I see it is that the effects of silver on microbes depends on
'available' surface area.
In a liquid, that surface area can be huge depending on the size of the
particles.
In a solid, it will be limited by the exposure possible at a given
porosity...that is, the size of the pore in the filter will determine
the
maximum exposure of silver to the water going through it by the surface
area presented by the pore.
The best you can do is to make very small pores entirely coated with
silver.
The silver that's not on the pore surface will do nothing at all.
If it's possible to make tiny, close packed but still seperate beads of
silver on the pore surface, THAT may increase surface area exposure over
a
solid sheet.
So, "possibly", saturating the filter with oxide particles small enough
to
get into the pores and burning off the oxygen in the oxide during
fireing
will make those micro beads that stay stuck to the clay surface.
If you're using sawdust to determine the size of the pore in the clay,
perhaps soaking the sawdust with silver oxide sludge will do it. [Or
specifically sized...by screening?... charcoal chunks?]
It's not hard to make CS sludge. [Lots of voltage and current and
enough
time to disintigrate the electrode..done wrong the right way, mere
minutes.
Guessing 20,000 volts at a few amps?]
If voltage and current is high enough, the sludge will actually
emulsify.
It will be deep brown turning to quite black.
{ I discovered the best way to not make good CS first off...slight fire
hazard there too.}
Patterson [forget the first name...James?] patented micro beads and
made
millions when it became apparent that they had unique delivery
properties
for many cosmetics and drugs depending on what the bead coating was.
Many products you buy today have that feature.
Patterson is the guy who now is playing with a cold fusion process that
uses micro beads. [Microscopic round particles coated with another
material...palladium?]
This will be too high tech to do in the field, but it seems like
spraying
very fine clay dust [or silica to make glass beads?] into a vaccuum
along
with a silver plasma will result in such a bead which then could be
pressure packed or sintered together to form a pourous shape.
I've seen various filters [especially fuel filters] made by packing
small
round metallic shapes together..perhaps bonded by heating them to the
point
of stickyness [like spot welding] or perhaps simply by applying large
amounts of pressure in a mold. The size of the bead and extent of the
packing effect determines the porosity.
Ode
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