40 research outputs found
Optical Diagnostics of Iron Oxide Nanoparticle Synthesis in Microwave Oxygen Plasma
Iron oxide nanoparticle synthesis in microwave plasma is studied by optical diagnostics. The arrangement of the plasma reactor results in well-defined reactant mixing, which makes different parts of the reaction zone clearly observable. Besides the reaction zone, digital imaging also reveals the presence of heated nanoparticles. The optical emission spectroscopy is used to determine important plasma parameters
Breakdown delay times and memory effects in helium at low pressure
We have measured the breakdown delay times and memory effects in helium at low pressur
Modulation-Induced Filament Tearing in Microwave Atmospheric Plasma Jet
High resolution visualization of plasma plume tearing-off during rapid power decrease in amplitude modulated microwave argon jet.Vizualizace odtrhávání filamentů během prudkého poklesu výkonu při amplitudově modulovaném výkonu.High resolution visualization of plasma plume tearing-off during rapid power decrease in amplitude modulated microwave argon jet
Organosilicon reactions with atoms: HMDSZ + N
Using electron paramagnetic resonance technique, we determined the kinetic constant of HMDSZ + N reaction in plasma afterglow.Reakce organosilikonu s atomy: HMDSZ + NOrganosilicon reactions with atoms: HMDSZ +
Electrode-less plasma jet synthesis of core-shell iron/iron oxide nanoparticles
We report on core-shell iron and iron oxide nanoparticle prepared by plasma synthesis controlled by process gas mixture. The synthesis was carried out using an atmospheric pressure microwave electrodeless plasma jet. We focused on phase composition control and better passivation. We studied the influence of O2, H2 and N2 admixtures to the Ar process gas on the properties of the prepared nanomaterial. Similarly to thermal process, the oxygen admixture preferentially produced Fe2O3 nanoparticles whereas hydrogen admixture resulted in particles with higher metallic content. However, in contrast to thermal process, the addition of nitrogen did not produce iron nitride, but iron/iron-oxide core-shell nanoparticles with enhanced chemical stability
Role of admixtures on dissociation of molecular gases
We investigated a role of admixtures on dissociation of molecular gases using electron paramagnetic resonance technique.Zkoumali jsme vliv příměsí na disociaci molekulárních plynů metodou EPR.We investigated a role of admixtures on dissociation of molecular gases using electron paramagnetic resonance technique
Plasmachemical nitridation of boron precursors
We carried out the plasmachemical nitridation of boron precursor
Study of mode transition in low pressure capacitive RF discharges in nitrogen
We have studied the mode transition in low pressure capacitive RF discharges in nitroge
Measurement of concentration of N atoms in afterglow
We carried out the measurements of concentration of N atoms in afterglo