National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Properties of iron nanoparticles sealed in protective media
Schneeweiss, Oldřich ; Hapla, Miroslav ; Zbořil, R. ; Mašláň, M.
Iron nanocrystalline powder was prepared by the reduction of ferrihydride. The samples were sealed in Ar in a plastic bag to avoid any contact with air in the form of (i) the as-prepared powder, (ii) the powder mixed with a vacuum grease, and (iii) the powder after a very slow oxidation at room temperature which formed an oxidic shell. Their phase compositions were investigated by XRD and Mossbauer spectroscopy. These data were completed by magnetic measurements. The intense amorphous-like component was observed in the Mossbauer spectrum of the as-prepared powder. The origin of this component is discussed.
Possibilities of change of grain size distribution and surface treatment of particles disintegrated by high speed water jet
Martinec, Petr ; Sitek, Libor ; Ščučka, Jiří ; Foldyna, Josef ; Mašláň, M.
Paper deals with possibilities of further surface treatment of micas and vermiculite particles prepared by water jet disintegration. The paper is a follow-up to paper on the preparation of precursors and carriers of nanoparticles by water jet technology presented in these Proceedings.

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