used lab equiptment

[Eugene Leitl]

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.