ECerS XIII – Universities and Institutes – Second day at ECerS in Limoges. We can see that research groups around the world show an increasing interest in Freeze Granulation as a powder processing tool of especially nanopowders, like carbon nanotubes. The reason being as Freeze Granulation offers an easy and practical method to handle fine nanopowders and to manufacture homogeneous granules which are optimal for pressing and sintering of different materials.
Nano ice in granules by Freeze Granulation
The formation of nano ice in the Freeze Granulation process is a key factor for the unique homogeneity of particles and binders achieved in the resulting granules. This is especially important for nanopowders, fine particles and binders where migration of these could occur during conventional drying, like spray drying.
We have long experience in handling and processing of nanoparticles/nanopowders, for example, mix and granulate different powders and binders for to achieve improved homogeneity and increased performance of the final product.
Freeze granulation gives the possibility to granulate nanoparticles/nanopowders achieving granules with high degree of homogeneity which are easily re-dispersed (if applicable) in a liquid or dis-integrated at a pressing operation. This is owing to the 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 also prevents oxidation of metals or non-oxide materials as conventional drying do not, especially critical for nanopowders.