Establishment of a design methodology for continuous process of supercritical hydrothermal nanoparticle synthesis based on rapid mixing

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420775
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Reaction engineering/Process system
• Research Institution: Tohoku University
• Principal Investigator: Aoki Nobuaki 東北大学, 原子分子材料科学高等研究機構, 助教 (90437244)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 超臨界流体 / 流通系反応器 / 混合速度 / 反応律速 / 設計 / ダムケラー数 / 反応速度解析 / 無次元数

Outline of Final Research Achievements

Continuous hydrothermal synthesis method has been used for synthesis of various metal oxide nanoparticles. By using flow-type reactor, rapid heating of the precursor and large scale production of nanoparticles can be achieved. Owing to extremely rapid reaction under a supercritical condition, the mixing of precursor and preheated water has a high impact to the particle size and its distribution. Therefore, to establish a rational design method, the investigation of mixing effect is needed as well as reaction kinetic analysis. In this work, hydrothermal synthesis of cerium oxide nanoparticle with flow-type reactor was carried out, and the effect of mixing rate and reaction rate on the average particle size was examined. The results show that when a dimensionless number (ratio of the reaction rate to the mixing rate) is less than a certain value, a reaction controlled condition where the produced particle size is independent of mixing rate.

Free Research Field

プロセス工学