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