used lab equiptment
Eugene Leitl
Eugene.Leitl at lrz.uni-muenchen.de
Sun Oct 21 12:01:40 PDT 2001
On Thu, 18 Oct 2001 keyser-soze at hushmail.com wrote:
> A specialized ultrasonic device is not required to produce micron fine
> aerosol powders. All one needs is a used and cleaned print head
In fact not, pressure waves strong enough to aerosol liquid will also
cause cavitation, resulting in heating and destruction of material.
> assembly and its piezo pulse circuitry. Nozzle apertures are
> typically 25-50 micron and if the material is suspended, in weak
Ever tried pushing a bacterial suspension through a printer head
(processivity set aside)? It will clog it up in no time.
> concentration, in a solution which quickly evaporates but doesn't harm
> the spores it should produce moderate quantities of fine powder
> quickly.
Um, why don't we quit armchair microbiology, and stick to what we can
best: produce lots of uninformed speculations? Oh.
> If smaller sizes are desired a field ring charged to 1000-3000v DC can
> be placed around and in front of the nozzles. If operated in sync
> with the nozzle pulses it can cause a the emerging droplets to cascade
> to nanometer size via the electrospray effect (now becoming common in
> drug production). See
> http://www.essex.ac.uk/bs/staff/colbeck/index.htm#appas
I think it should be easy enough to look up relevant patents online,
assuming one is bored enough.
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