Nanomaterials dry box drying
    Box -type drying method is a direct drying , direct drying method is the liquid phase resulting precipitate directly ( or simply filtered after washing ) using conventional drying or high temperature calcination product obtained nanomaterials method of operation .
    The gel pore size of nanometer order , to remove the liquid solvent is maintained constant fine porous network structure is extremely difficult. In the box dryer ( ie oven ) , the normal pressure ( or slightly negative ) so that the hot air as the drying medium nanomaterials holes in the liquid solvent evaporates, the nano-porous gel and vapor - liquid interface surface capillary tension of contraction caused great force ; the use of a rapid heating drying method , because the gel phase and the solid phase solvent hole difference in coefficient of thermal expansion , if the stress exceeds the strength of the gel network skeleton , will make gel pore collapse of the porous network structure destroyed. Therefore, we must use a slow drying reportedly safe drying rate even took more than one year. The box -type drying nanoparticles , although more than used in the laboratory , but the capillary pressure of the existence of the powder particles have serious agglomeration , it is difficult to obtain good quality nano powder products . Although this drying method is economical, simple , but very easy to introduce impurities, and uneven drying , agglomeration between particles serious .