Quality control of these very small particles includes visualization by electron microscopy.

However, the preparation of nanoparticles is not easy
and artefacts frequently occur, necessitating the use
of freeze-fracture or other laborious procedures.

To overcome this difficulty our laboratory has developed
a reliable preparation technique in which the suspension
of nanoparticles is placed on a suitable filter.

This technique allows for an even spreading of the nanoparticles, avoiding the formation of aggregates,
while the particle shape remains undisturbed.

[publication 4, 6 and 27]