Getting water to go through a pore small enough to catch the smaller particles could be a real challange.
However, if using a parchment like membrane, you could probably make a very cool bandage.
Ode
At 04:24 PM 8/3/2004 -0400, you wrote:
>>>>
Hello, Members of the List,<<<<
About two months ago, Frank Key contributed very
generously some techniques for fractionating EIS into
its constituent species of silver, ionic and particulate.
These were ultracentrifugation and freezing. The
latter is, of course, the more readily available technique
for most people. But the particulate (colloidal) fraction
is lost by this separatory technique.
According to Herbert Freundich, the standard method
for separating and purifying colloids for many years had been
the original method discovered by Thomas Graham.
This is fractionation by semipermeable membranes.
Using this method, the colloid is not lost.
Modern microfilters, utrafilters and nanofilters can be
be bought for 1 or 2 dollars apiece when purchased in
lots of a hundred. A century ago, parchment
was used and did a reasonably good job. Perhaps
other natural semipermeable membranes exist that
will purify or condense colloids by removing the
dissolved ionic fraction from EIS.
Has anybody tried this?
Best regards,
Matthew
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