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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all. Looks like I might be onto something here.
Bought a used ultrasonic cleaner for £5 here. Just occcurred to me to try putting some silver gilding foil in there to see if it shreds it like aluminium, Yes, it does
So in theory this method could be used to generate very small silver particles down to the micrometre range, which should behave essentially the same as silver conductive paint when mixed with a suitable binder such s Humbrol Liquid Poly or tyre repair cement.
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
Do you realistically think you can make a micro particulate? Because what you would need (for dependable contact)) is something in the 2-9 micron range. From what I have seen with conductive paint there have been particulates of aluminum or nickel. Since nickle powder is now much harder to obtain and aluminum powder, much easier; most are aluminum in a single micron size range with an acrylic used as thin as possible to maintain contact.
Registered Member #3559
Joined: Sun Jan 02 2011, 01:19AM
Location:
Posts: 16
Would the aluminium atomised powder in acrylic binder leave a conductive surface after it dries? If so, this would be good for painting non conductive a matrix/mandrel for electroforming copper.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Pinky's Brain wrote ...
I know that for ultrasonic mixing the particle sizes are rather large with these kind of transducers, it's on the order of the wavelength ...
Ultrasonic atomizers/humidifiers/fog generators work better in this respect, since they operate in the MHz range.
Will have to try this and get back to you.
I have a fog generator here which unfortunately got Shapelocked into the bottom of a plastic beaker which then leaked. Any ideas? If all else fails I might be able to replace the transducer with a spare.
The basic circuit seems simple enough, just a resonant tank at 1.4 MHz or near that depending on the size of the transducer. Resonant frequency changed depending on fluid depth so a single transistor oscillator based on a beefy RF power transistor might work better than an H-bridge.
Anyone managed to find out how fast the MPSA42 switches?
-A
"Both.. (cough) (splutter) er!" said Pooh, as his car expired due to fuel blockage...
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Conundrum wrote ...
."Both.. (cough) (splutter) er!" said Pooh, as his car expired due to fuel blockage...
Easiest 'quick'fix' is to use one of those small 12V compressors wihich run off a cigar lighter with the tapered attachment they come with to blow the blockage back into the fuel tank. Just disconnect the feed to the injector pump or carb.
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DIY silver conductive paint- RESULTS
