Freeze Granulation of nanoparticles and nanopowders
Freeze granulation gives the possibility to granulate nanpowders, like graphene platelets and graphene oxide, achieving granules with high degree of homogeneity which are easily redispersed (if applicable) in a liquid or disintegrated at a pressing operation. This is owing to the soft drying process giving week inter-particle bonding compare to what is obtained in conventional drying. Consequently, the nanosized material properties will be preserved, i.e. nano will still be nano. Freeze drying of granules also prevents oxidation of metals or non-oxide materials as conventional drying does not, especially critical for nanoparticles.
Nanopowders can be granulated and dried into a powder and then redispersed to nanoparticles again avoiding agglomeration (aggregates), which is not possible with other granulation methods like spray drying. By Freeze Granulation of nanomaterials you can easily redisperse the dried powder to the primary particles only by simple impeller stirring in water, see illustration below.