We perform quantitative optical emission spectroscopy on the hot core of the cathode region of a free-burning arc in argon under atmospheric pressure. As the peak temperatures in the centre of the discharge exceed 22 000K we are able to observe three spectra of argon (Ar I, Ar II and Ar III) and the continuum emission. We report on some inconsistencies concerning the evaluation of Ar III radiat...

In the present work, we have reported the in situ oxidation of manganese (II) acetate to MnO2 nanoparticles through the thermal plasma carbonized natural hydroxyapatite (MnO2/TP-NHAp) as a neoteric sustainable method. Interestingly, the thermal plasma-processed surface of the NHAp shows a great ability for oxidation of the manganese (II) without need of any external oxidizing agents. The cataly...

AIM To investigate the effect of nonthermal atmospheric pressure plasma on intracoronal tooth bleaching in blood stained human teeth. METHODOLOGY Forty extracted single-root and blood stained human teeth were used. The teeth were randomly divided into two groups (n=20): group 1 received 30% HP activated by nonthermal atmospheric pressure plasma in the pulp chamber for 30 min, whilst group 2 r...

A microplasma suitable for material processing at atmospheric pressure in argon and argon-oxygen mixtures is being studied here. The microplasma is ignited by a high voltage dc pulse and sustained by low power 1–5 W at 450 MHz. the mechanisms responsible for sustaining the microplasma require a more detailed analysis, which will be the subject of further study. Here it is shown that the micropl...

An experimental study of a plasma plume generated by radio frequency atmospheric pressure glow discharge and enhanced in terms length intensity pulsed is presented. When injecting bullet into the plume, ambient air can be elongated from 2 mm to 6 elevated four times. The propagation interaction with are demonstrated temporal evolution spatial appearance. employed improve O/C ratio carbon fiber,...

The field of Atmospheric-pressure plasmas has been the focus of many researchers and scientists in the past decade. These specific types of systems are favored because of the few requirements needed for its functioning. Plasmas’ use as a sterilizer is being rapidly explored. Thus, in this process it has become necessary to understand the effect of UV radiation produced during the plasma dischar...

Plasma co-polymers (co-p) were deposited with an atmospheric pressure plasma jet (APPJ) using a precursor mixture containing hexamethyldisiloxane (HMDSO) and limonene. A coating fragments from both precursors siloxane, carbonyl nitrogen functional groups was deposited. The flow rate of limonene found to be important parameter for co-polymerization tune the formation structure groups. FTIR XPS a...

The purpose of this paper is to propose and analyze a simplified model for plasma generation in air flows at atmospheric pressure. The starting point is a model previously proposed by Lowke [21], enriched with a loss term which schematically takes into account the drag of the metastable and ionized species by the flow. An asymptotic analysis of this model confirmed by numerical simulations is p...