# 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.

• Crystal growth isn't that easy to have- fine (mm) powders is normal with precipitation. If you seeking smaller than that, that is hard because the powders aggregate to larger particles. – user2617804 Jan 18 '15 at 9:20