Prevent crystal growth by adding a chemical to a solution? If I have a solution of dissolved $\ce{NaCl}$ or sugar (or some other ionic compound), is there a chemical I could add to it that would prevent crystal growth if I boil it down? I'm looking for it to remain as a very fine powder or to keep the crystals as small as possible.
Spray it as a fine mist into a drying chamber - the solvent will evaporate and you are left with a powder. 
No chemical involved though,  but still process chemistry.