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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Nanocompositní materiál s železnými nanočásticemi obalenými grafitem připravený dvoustupňovou procedurou
 David, Bohumil ; Pizúrová, Naděžda ; Schneeweiss, Oldřich ; Bezdička, Petr ; Alexandrescu, R. ; Morjan, I. ; Cruneteanu, A. ; Voicu, I.
We describe the phase composition and magnetic properties of the nanocomposite based on iron/graphite core-shell structured nanoparticles. This nanocomposite was prepared by a two-step procedure: in the first step, the original Fe-C-N based nanopowder was synthesized by the method of laser pyrolysis of gas phase reactants, and subsequently in the second step, it was heated up to 800°C in vacuum. Annealing in vacuum induced the formation and growth of iron/graphite core-shell structured nanoparticles. Both the originally synthesized Fe-C-N based nanopowder and the annealed nanopowder were characterized by TEM, XRD and magnetic measurements. The presence of iron nanoparticles with the mean diameter of 40 nm in the annealed state of the nanopowder was proved by XRD and TEM analysis. Mössbauer spectroscopy was used to observe a qualitative change in phase composition.
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Tvorba mikro a nanoporů v polovodičích A.sup.3./sup. B.sup.5./sup
 Nohavica, Dušan ; Gladkov, Petar ; Zelinka, Jiří ; Dvořák, Martin ; Pirov, J.
Electrochemically etched pores are accessible also in A.sup.3./sup. B.sup.5./sup. semiconductors. In particular, pores in InP, GaAs and GaP have been investigated in our laboratory. More complex experimental data have been collected for InP which is suitable for the preparation almost self organized pores net. Pores multilayer containing current oriented and/or crystallographic pores was prepared and some details of the process are discussed. The GaAs and GaP demonstrate both, current oriented and crystallographic pores as well with specific differences.
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