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for some graduate project I'm trying to create a mist from some water based solution to apply it to a surface, basically the surface is solid but very gentle and I need to spray it with this solution as evenly as possible, I cannot apply the solution with a syringe and then spread it around since this will pattern the surface, also the volume applied to the surface is important, I need to spray 2ml+-0.5ml, spraying 4ml for example would be too much

I've looked into an air brush but I couldn't find a way to control the volume and I've looked into a spray bottle but the volume there is too big. any advice or suggestion would be welcome for a tool that can do this would be great!

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You might want to look into using an inkjet (salvaged from an old printer). They can produce a regular, directed stream of small droplets and have a capacity of at least several mL. You can power them and control their behavior electronically. There are probably inkjet printers available that print onto a fixed platen, so that would take care of the production aspects.

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You might use a perfume atomizer, if the solution is compatible with the materials of the sprayer. Measure the volume supplied with each squirt; it should be quite consistent, due to the constant volume of the plunger.

You could also construct an atomizer from glass tubing, as is done with soda straws in this Do-Science article. Again, I would suggest measuring the efficiency with which the spray is delivered... there will be some over-spray and drifting with any atomizer.

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