The influence of process parameters on precursor evaporation for alumina nanopowder synthesis in an inductively coupled rf thermal plasma

Shin, Jae Wook; Miyazoe, Hiroyuki; Leparoux, Marc; Siegmann, S.; Dorier, J.‐L.; Hollenstein, Ch.

doi:10.1088/0963-0252/15/3/020

Cited by 28 publications

(26 citation statements)

References 28 publications

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“…1). According to modelling and enthalpy probe measurements [26,27], this position corresponds, for the process parameters used for SiC1 reference sample (see Table 1) to an axial plasma temperature of 3,000°C. In this paper, only the experiments performed with a constant quenching gas flow rate of 30 slpm are described.…”

Section: Experimental Methodsmentioning

confidence: 99%

Controlled Synthesis of β-SiC Nanopowders with Variable Stoichiometry Using Inductively Coupled Plasma

Leconte

Leparoux

Portier

et al. 2008

Plasma Chem Plasma Process

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In the growing field of nanomaterials, SiC nanoparticles arouse interest for numerous applications. The inductively coupled plasma (ICP) technique allows obtaining large amount of SiC nanopowders from cheap coarse SiC powders. In this paper, the effects on the SiC structure of the process pressure, the plasma gas composition, and the precursor nature are addressed. The powders were characterized by X-ray diffraction (XRD), Raman and fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and high resolution electron microscopy (HREM), chemical analyses, BET and photon correlation spectroscopy (PCS) measurements. Whatever the precursor (a-or b-SiC), the nanoparticles were crystallised in the cubic b-SiC phase, with average sizes in the 20-40 nm range. Few residual grains of precursor were observed, and the decarburization due to the reductive Ar-H 2 plasma lead to the appearance of Si nanograins. The stoichiometry of the final product was found to be controllable by the process pressure and the addition of methane.

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Section: Experimental Methodsmentioning

confidence: 99%

Controlled Synthesis of β-SiC Nanopowders with Variable Stoichiometry Using Inductively Coupled Plasma

Leconte

Leparoux

Portier

et al. 2008

Plasma Chem Plasma Process

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“…This type of investigation is of interest for nano-powder synthesis applications, where main processes (particle nucleation and growth) take place in the low temperature (over-saturated) zone located in the downstream region of the torch [18,29].…”

Section: Confidential: Not For Distribution Submitted To Iop Publishmentioning

confidence: 99%

A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system

Colombo¹,

Ghedini²,

Sanibondi³

2010

J. Phys. D: Appl. Phys.

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To cite this version:V Colombo, E Ghedini, P Sanibondi. A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system. Journal of Physics D: Applied Physics, IOP Publishing, 2010, 43 (10), pp.105202. <10.1088/0022-3727/43/10/105202>. A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively-coupled plasma system V Colombo, E Ghedini, P Sanibondi Dipartimento di Ingegneria delle Costruzioni Meccaniche, Nucleari, Aeronautiche e di Metallurgia (DIEM), Alma Mater Studiorum -Università di Bologna, Via Saragozza 8, 40123 Bologna, Italy E-mail: paolo.sanibondi@unibo.it Abstract.A three dimensional numerical model for the simulation of the behavior of a commercial inductively coupled plasma (ICP) torch with non-axisymmetric reaction chamber has been developed, taking in account turbulence and gas mixing through RNG k-theory and the combined diffusion approach of Murphy, respectively.The effects of changing coil current frequency, the hydrogen mixing in an argon primary gas and the flow patterns and temperature distributions which take place in a reaction chamber with a lateral gas outlet system and two observation windows have been investigated, with the final aim of setting up a computational tool able to predict the main features of plasma assisted treating and processing of injected raw materials.Three-dimensional shapes of the temperature, velocity and mass fraction fields have been obtained and analyzed for an Ar-H 2 mixture at atmospheric pressure.Computations have been performed with two different coil current frequencies, i.e. 3 MHz and 13.56 MHz, showing that for the lower value the 3-D effects in the discharge are enhanced.Accurate mixing and demixing mechanisms have been investigated in both cases, including considerations on the relative importance of different thermal diffusion contributions due to mole fraction and temperature gradients.Temperature distributions in the reaction chamber for different cases have been correlated to different flow patterns and recirculation flows which take place as a consequence of the non-axisymmetry of the reaction chamber.

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“…From another viewpoint, if the feeding rate is higher, the amount of non-plasma-treated powder will, in all probability, increase. It is thus reasonable that the amount of nano-powder decreases [26]. Therefore, to increase the nano-powder ratio, the feeding rate should be reduced.…”

Section: Figurementioning

confidence: 99%

Control of the Nano-Particle Weight Ratio in Stainless Steel Micro and Nano Powders by Radio Frequency Plasma Treatment

Yang

Kim

Hur

et al. 2015

Metals

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This study describes how to make stainless steel hybrid micro-nano-powders (a mixture of micro-powder and nano-powder) using an in situ one-step process via radio frequency (RF) thermal plasma treatment. Nano-particles attached to micro-powders were successfully prepared by RF thermal plasma treatment of stainless steel powder with an average size of 35 μm. The ratio of nano-powders is estimated with a two-dimensional fluid simulation that calculates the temperature profile influencing the rate of surface evaporation. The simulation is conducted to determine the variation of the input power and the distance from the plasma torch to the feeding nozzle. It was demonstrated experimentally that the nano-powder ratio in the micro-nano-powder mixture can be controlled by adjusting the feeding rate, plasma power, feeding position and quenching effect during plasma treatment. The ratio of nano-particles in the micro-nano-powder mixture was controlled in a range from 0.1 (wt. %) to 30.7 (wt. %).

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The influence of process parameters on precursor evaporation for alumina nanopowder synthesis in an inductively coupled rf thermal plasma

Cited by 28 publications

References 28 publications

Controlled Synthesis of β-SiC Nanopowders with Variable Stoichiometry Using Inductively Coupled Plasma

Controlled Synthesis of β-SiC Nanopowders with Variable Stoichiometry Using Inductively Coupled Plasma

A three-dimensional investigation of the effects of excitation frequency and sheath gas mixing in an atmospheric-pressure inductively coupled plasma system

Control of the Nano-Particle Weight Ratio in Stainless Steel Micro and Nano Powders by Radio Frequency Plasma Treatment

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