Micron-particle and sub-micron-particle materials have been widely applied to chemical and its associated industry including catalyst,dope,fuel,dye and superconductive material,especially in pharmaceutical industry.The third form called 'controlled release' and the fourth form called 'target drag' are being the interesting field as a necessary way for drug delivery.The conventional methods for producing fine powders include spray drying,jet and ball milling and recrystallization using solvent evaporat...
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