Kinetics study to identify reaction-controlled conditions for supercritical hydrothermal nanoparticle synthesis with flow-type reactors

Nobuaki Aoki, Ayato Sato, Hikari Sasaki, Andrzej Alexander Litwinowicz, Gimyeong Seong, Tsutomu Aida, Daisuke Hojo, Seiichi Takami, Tadafumi Adschiri

研究成果: Article査読

23 被引用数 (Scopus)

抄録

Flow-type reactors are effective for the precise control of reaction conditions and high throughput production. To enhance the effectiveness of this process, the establishment of a design method is required. For this purpose, the effects of operating parameters on supercritical hydrothermal nanoparticle synthesis in a flow-type reactor were examined. Ceria nanoparticles were formed from 2.0 mM cerium nitrate at reaction temperatures ranging from 200 to 380 °C and with a flow rate of 11.6-37.5 mL/min. In addition, channel sizes of 0.3, 1.3, and 2.3 mm were used for the mixing point. Rapid mixing and higher temperatures were found to enable the formation of smaller nanoparticles. Furthermore, all experimental results were summarized using dimensionless numbers. Though the Reynolds number was related to the effect of mixing on particle formation, this number is independent of the reaction rate. Results were correlated using the Damköhler number, the ratio of reaction rate to mixing rate. From the threshold value of the Damköhler number, reaction-controlled conditions where the particle size was independent of the flow/mixing rate could be predicted.

本文言語English
ページ(範囲)161-166
ページ数6
ジャーナルJournal of Supercritical Fluids
110
DOI
出版ステータスPublished - 2016 4 1

ASJC Scopus subject areas

  • 化学工学(全般)
  • 凝縮系物理学
  • 物理化学および理論化学

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