Pulse powder delivery of 0.25mg for a few seconds

AI Thread Summary
The discussion focuses on finding an effective delivery mechanism for a granular powder, specifically 0.25 mg, in a laboratory setting. Venkat has attempted an injection method but faced challenges with the powder compacting rather than dispensing. Suggestions include using high-frequency, low-amplitude vibrations to prevent caking and considering pharmaceutical tablet presses or capsule fillers as potential solutions. The particle size of the powder is approximately 20 microns, which complicates the delivery process. Overall, the conversation emphasizes the need for a specialized delivery system that maintains the powder's integrity while facilitating precise dosing.
vkar16
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Hi,

I am trying to create a laboratory scale system, where I would like to deliver 0.25 mg of a substance which is granular and powder like consistency. I would like to pulse it for a few seconds and stop it. Can anybody tell me a good delivery mechanism for this. I have a method to disperse it but I am not able to find a bulk delivery system for that specs.

Thanks and best regards
Venkat
 
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Would this be for an experiment pertaining to fluid mechanics? If so you should be able to use an injection method similar to dye. If even if its not fluids related a dye-analogous method may be worth investigating.
 
Hi Aero 51. I could not succeed in the injection method as I am not supposed to liquefy or convert it to an aerosol. When used as is, the powder only compacts but does not come out. I tried using a Auger Feed mechanism (1.5 cm dia) but it was too large for the dosage I am looking into. The particle size is about 20microns in dia for my particles. Thank you for your suggestion though.
 
If caking is an issue you could always use the injection method with the added configuration of high frequency, low amplitude vibrations throughout the delivery system.
 
Pharmaceutical tablet presses and capsule fillers come to mind.
 

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