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Proceedings Paper

Bubble formation around nanoparticle during microwave irradiation by DLS
Author(s): Takuya Munenaga; Yusuke Maeda; Yusuke Asakuma
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Paper Abstract

During the last two decades, microwave (MW) technology has fascinated a great number of researchers and engineers in materials science and chemistry. It is widely recognized that MW irradiation has the capability of accelerating reaction [1], obtaining the desired phases and structures in simple procedures [2]. The MW acceleration has been demonstrated on the synthesis of ceramic powders, polymers, and composites in the field of hydrothermal synthesis and emulsion polymerization for fine particle and the monodisperse distribution [3]. Recently, MW has been applied for industries with the process as material characterization, energy and time saving. However, mechanism of the fine particle formation and the mono dispersed distribution under MW irradiation has not been clear due to difficulty of direct observation inside the reactor. First, when inside observation tool is attached with the reactor, shape of waveguide tube must be designed caring the prevention of MW leakage. Commercial measuring apparatus is not necessarily suited for the shape and it is difficult to adjust power of light source, angle between light axis and detector probe. Meanwhile, our laboratory has experience and knowledge of nanoparticle observation [4] and reaction by use of MW [5]. Finally, in-situ observation of nanoparticle behavior under MW irradiation became possible through our measurement technique. The movement of smaller particles whose size is smaller than few microns is governed by random Brownian motion. This motion causes the flow around the particles. The force acting upon Brownian particles is measured by using the dynamic light scattering (DLS) technique [4]. It finally provides the diffusion coefficient and particle size. In this study, we propose in-situ observation technique of nano-particle behavior in MW reactor and clarify the movement of the particles in water during and after MW irradiation.

Paper Details

Date Published:
Proc. SPIE 9232, International Conference on Optical Particle Characterization (OPC 2014), ; doi: 10.1117/12.2063435
Show Author Affiliations
Takuya Munenaga, University of Hyogo (Japan)
Yusuke Maeda, Univ. of Hyogo (Japan)
Yusuke Asakuma, Univ. of Hyogo (Japan)

Published in SPIE Proceedings Vol. 9232:
International Conference on Optical Particle Characterization (OPC 2014)
Nobuhiro Aya; Norihiko Iki; Tsutomu Shimura; Tomohiro Shirai, Editor(s)

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