Mixing speed-controlled gold nanoparticle synthesis with pulsed mixing microfluidic system |
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Authors: | Koji Sugano Yuki Uchida Osamu Ichihashi Hideo Yamada Toshiyuki Tsuchiya Osamu Tabata |
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Affiliation: | (1) Department of Micro Engineering, Graduate School of Engineering, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan |
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Abstract: | Gold nanoparticles with diameters of a few tens of nanometer and a narrow size distribution were synthesized using a pulsed
mixing method with a microfluidic system which consists of a Y-shaped mixing microchannel and two piezoelectric valveless
micropumps. This mixing method enables control of the mixing speed of gold salts and reducing agent by changing the switching
frequency of the micropumps, which was our focus to improve the particle size distribution, which is an essential parameter
in gold nanoparticle synthesis. In the proposed method, the mixing time was inversely proportional to the switching frequency
and the minimum mixing time was 95 ms at a switching frequency of 200 Hz. During synthesis experiments, the mean diameter
of the synthesized gold nanoparticles was found to increase, and the coefficient of variation of particle size was found to
decrease with decreasing mixing time. We successfully improved the coefficient of variation to less than 10% for a mean diameter
of around 40 nm. |
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