05:51 <Noxz> any homemade ultrasonic homogenizers? I'm looking to dabble with making graphene via water/heptane interface barrier

07:00 <nmz787> i've looked into them before to do cell lysis for protein recovery, but I didn't find much at the time. Recently I saw some page talking about making your own piezo positioner, and I think it was talking about sourcing pizeo ceramic then adding their own electrodes on.

11:19 <SpeedEvil> large watts ultrasound thingies are available

11:22 <SpeedEvil> http://www.aliexpress.com/item/100W-28KHz-Ultrasound-Transducer-Ultrasonic-Piezoelectric-Transducer-Cleaner/32254926219.html

13:09 <_Sync_> they have been since a while

13:11 <_Sync_> although the drivers that come with them are suuuuper dangerous

13:13 <chris_99> dangerous how?

13:14 <SpeedEvil> mains isolation

13:14 <SpeedEvil> Or lack

13:14 <chris_99> oh heh

13:15 <chris_99> could you do ultrasonic welding with those i wonder

13:15 <SpeedEvil> 'yes'

13:15 <SpeedEvil> with a suitable horn

13:16 <chris_99> is the horn essentially just plastic or whatnot to focus the beam

13:20 <_Sync_> alu mostly

13:21 <chris_99> aha

13:33 <SpeedEvil> It's an internal focus

13:34 <SpeedEvil> the ultrasound bounces around internally to the metal - not externally

16:38 <Noxz> I was not planning on making the transducer, just the powersuppply/singla generator (as the chinese ones look like garbage) and maybe the acousti/ultrasonicc horn from some machine shop (440 stainless steel I think was listed as a common material used for that)

16:49 <_Sync_> simulating the horn is an art tho

16:49 <Noxz> eh, just find a patent or dimensions in some book and copy them ;)

16:49 <Noxz> I dont want to desgin an ultrasonic machine fromt he ground up, I just want one on the cheap

16:50 <_Sync_> well

16:50 <_Sync_> the thing is, the chinese ones are not made to be coupled into a sonotrode

16:51 <Noxz> tranducer or signal generator?

16:51 <_Sync_> the transducers

16:51 <Noxz> the transducers with a scre terminal or whichever is capable

16:51 <Noxz> screw hole

16:53 <_Sync_> http://www.powerultrasonics.com/content/sonotrode-calculator that actually doesn't seem so bad

16:54 <_Sync_> although it can't do much

16:54 <Noxz> the method I referenced, heptan/water with graphite to make graphene, did 40% of a 750W machine, so an output of 300W is my goal

16:55 <Noxz> from, say, a 100W transducer

16:56 <Noxz> agh, gotta get ready for work

16:56 <Noxz> always getting in the way of fun

16:58 <_Sync_> although apparently you need to tune them individually

16:58 <Noxz> I was assuming some sort of PLL

16:59 <Noxz> for feedback

17:02 <Noxz> laters

17:14 <_Sync_> that does not help

17:14 <_Sync_> you need the resonance frequency of the sonotrode to be the same as the transducer