I would have come in earlier, but I was at a 3 week workshop.
If you want to do thousands of valves on a DIY budget, each valve
should cost pennies or less. The Nitinol solution comes close, and
is worth pursuing, but building a thousand of them sounds tedious.
Suppose you have a PDMS sheet above a network of channels, so that
pushing down on the sheet above a channel cuts off the flow.
Now spread some glue on top, and sprinkle with magnetic sand, made
from the same stuff NdFeB magnets are sintered or bonded out of.
Now you can move an electromagnet under it on an X/Y table, and
turn the magnet on to pull the sand down on the PDMS sheet.
A neat trick is to make two combs out of mild steel pins, each with 32 teeth. The teeth are separated by non-metallic plastic, aluminum, or brass.
The two combs are orthogonal to one another, in an X/Y arrangement,
and one below the other. You move the combs so that one tooth from
each comb is under the PDMS valve you want to control. An electromagnet
under the combs is then turned on. The steel pins conduct the magnetism,
so that only the sand above both teeth is pulled down. The electromagnet
is not strong enough to pull down any of the sand without the flux
concentration that the pins provide.
Of course this only gets you one valve at a time.
One comb moves in the
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Get a free science project every week! "http://scitoys.com/newsletter.html"On Sun, Jan 29, 2012 at 12:33 PM, Bryan Bishop <kanzure@gmail.com> wrote:
1000s of valves is a nightmare, especially as a routing problem... How about something like, optical addressing.On Mon, Jan 23, 2012 at 1:52 AM, Nathan McCorkle <nmz787@gmail.com> wrote:if one would want to control hundreds or thousands of valves at a
reasonable cost... I'm wondering if you could acquire small hollow
electromagnets to use as a solenoid directly on the membrane, or as a
single-channel displacement pump.Single-sided continuous optoelectrowetting (SCOEW) for droplet manipulation with light patternshttp://diyhpl.us/~bryan/papers2/microfluidics/Single-sided%20continuous%20optoelectrowetting%20(SCOEW)%20for%20droplet%20manipulation%20with%20light%20patterns%20-%20LCD%20-%202010.pdf
Massively parallel manipulation of single cells and microparticles using optical images- Bryan
http://heybryan.org/
1 512 203 0507
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