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TECHNICAL PAPERS: Micro/Nanoscale Heat Transfer

Numerical Analysis of Metallic Nanoparticle Synthesis Using RF Inductively Coupled Plasma Flows

[+] Author and Article Information
Masaya Shigeta1

Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering,  Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japanshigeta@nr.titech.ac.jp

Hideya Nishiyama

Electromagnetic Intelligent Fluids Laboratory, Institute of Fluid Science,  Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japannishiyama@ifs.tohoku.ac.jp

1

Corresponding author.

J. Heat Transfer 127(11), 1222-1230 (Jun 03, 2005) (9 pages) doi:10.1115/1.2039106 History: Received July 29, 2004; Revised June 03, 2005

A thermal plasma flow is regarded as a multifunctional fluid with high energy density, high chemical reactivity, variable properties, and controllability by electromagnetic fields. Especially a radio frequency inductively coupled plasma (RF-ICP) flow has a large plasma volume, long chemical reaction time, and a high quenching rate. Besides, it is inherently clean because it is produced without internal electrodes. An RF-ICP flow is, therefore, considered to be very useful for nanoparticle synthesis. However, nanoparticle synthesis using an RF-ICP flow includes complicated phenomena with field interactions. In the present study, numerical analysis was conducted to investigate the synthesis of metallic nanoparticles using an advanced RF-ICP reactor. An advanced RF-ICP flow is generated by adding direct current (DC) discharge to a conventional RF-ICP flow in order to overcome the disadvantages of a conventional one. The objectives of the present work are to clarify the formation mechanism of metallic nanoparticles in advanced RF-ICP flow systems and to detect effective factors on required synthesis. A two-dimensional model as well as a one-dimensional model was introduced for nanoparticle growth to investigate effects of spatial distributions of thermofluid fields in RF-ICP flows on synthesized nanoparticles. In an advanced RF-ICP flow, a characteristic recirculation zone disappears due to a DC plasma jet. Larger numbers of nanoparticles with smaller size are produced by using an advanced RF-ICP flow. Thermofluid fields in RF-ICP flows can be controlled by applied coil frequency by means of skin effect. Larger numbers of nanoparticles with smaller size are produced near the central axis. Dispersion of particle size distributions can be suppressed by higher applied coil frequency through control of RF-ICP flows. Applied coil frequency can be a remarkably effective factor to control nanoparticle size distribution.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 3

Vapor consumption rate evolutions with different flow types

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Figure 4

Particle size distributions with different flow types

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Figure 5

Thermofluid fields of the RF-ICP flows with the different applied coil frequencies: (a) temperature fields and (b) flow fields

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Figure 6

Total particle number density distribution: (a) f=3.0MHz and (b) f=13.56MHz

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Figure 7

Particle size distribution: (a) f=3.0MHz and (b) f=13.56MHz

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Figure 8

Radial distribution of mean volume diameters

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Figure 9

Comparison of particle size distributions to experimental data (2)

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Figure 10

Comparison of radial distributions of the total particle number densities to experimental data (28)

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Figure 1

Schematic illustration of a nanoparticle synthesis reactor

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Figure 2

Thermofluid fields of a conventional and advanced RF-ICP flows

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