Re: Ultrasonic Misters -> Sonication?

There's also the ultrasonic jewelry and eyeglass cleaners. Typical
models seem to be 42kHz, 35W, 1 pint (600ml) capacity.

On Jan 18, 1:41 pm, John Griessen <j...@industromatic.com> wrote:
> On 01/18/2012 10:24 AM, Cathal Garvey wrote:
>
> > What frequencies do these things operate at?
>
> 40 KHz to 80KHz
>
> I imagine the wattage is
>
> > going to be pretty low on these?
>
> 3 to 10 Watts often
>
> What frequencies and wattages do you
>
> > *need*  to get stuff done like:
> >   - Electroporation?
> >   - DNA sonication?
> >   - Cell disruption?
>
> I'm sure you can get a small sample to do whatever cavitating sonic waves
> will do, and at the small driver wattages found in those mister gadgets.
> The drivers for misting are a little different shape than for waves, but
> close to the same thing.  They probably make a ring focused beam that is
> aimed at the surface of the water reservoir so the surface is disrupted
> into mist, where the usual setup is to make waves that travel and hit
> tank walls or what is in the tank.
>
> > There's usually a water-level sensor on top to prevent them running
> > while dry, which would break the unit, but you could always put it into
> > a sample until entirely wet (without bubbles on the electret), turn
> > upside-down at the surface, and then plug in?
>
> Sounds reasonable.  OTOH, I got some piezo discs for cheap on ebay with experiments
> in driving them as sonicators in mind.  Think 0.05 USD.

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