Plasma Assisted Generation of Micro- and Nanoparticles

Abstract

In this research, the peculiarities of micro- and nanoparticles generation are considered. Two techniques of micro- and nanoparticles' formation using electric arc and underwater discharge plasma sources are proposed. Molybdenum oxide crystals were deposited on side surface of the bottom electrode (anode) of the free-burning discharge between metallic molybdenum electrodes. Friable layer of MoO<sub>3</sub>, which consists of variously oriented transparent prisms and platelets (up to few hundreds of $mu;m in size), was formed by vapor deposition around the electrode. In the second technique, plasma of the underwater electric spark discharges between metal granules was used to obtain stable colloidal solutions with nanoparticles of 20-100 nm sizes.

Synthesis of MoO3 by glow discharge in contact with water

“…Atmospheric pressure plasma discharges are also utilized for the synthesis of MoO 3 [19][20][21][22][23][24][25][26][27][28]. In this case, the molybdenum rods are utilized as electrodes.…”

“…For instance, metastable structures of β-MoO 3 have been obtained by Mariotti et al [19] by using atmospheric pressure ultra-high-frequency microplasma. α-MoO 3 and a mix of α-MoO 3 and β-MoO 3 can be synthesized by electric arc plasma and nanosecond repetitive pulsed discharge [20][21][22][23][24][25][26][27][28].…”

Method of Performance Assessment of Lubricant Compositions Containing Nano-Additives Used for Wheel–Rail Pair

“…The vaporization caused by rapid cooling of metal results in the formation of much smaller particles, often having edge facets, which is characteristic of crystalline formations. The ratio of nano-and ultradisperse particles of the mixture depends on the current intensity, frequency and duration of pulses (an increase in these parameters contributes to an increase in the amount of nano-particles), as well as the type of liquid [9,21]. The general scheme of the unit for the implementation of the specified method is provided in [9].…”

Plasma‐assisted synthesis and deposition of molybdenum oxide nanoparticles on polyethylene terephthalate for photocatalytic degradation of rhodamine B

“…The obtained results of energy consumption are comparable with the results of the synthesis of metal oxides using nanosecond plasma (75-600 eV/atom), presented in Reference [48], and comparable with values obtained for the glow discharge with the metal anode. [10] It should be noted that the energy consumption for producing metal oxides in arc discharges in water [39,40] is much larger (50 keV/atom).…”

“…An arc discharge plasma was used for the synthesis of the α-modification of molybdenum (VI) oxide in previous studies. [39,40] Also, a nanosecond pulsed discharge between two metal electrodes [41] and a microwave discharge [42] were used to synthesize oxides. In our previous study, we have successfully synthesized α-MoO 3 by using the glow discharge with Mo anode.…”