Preparation of Fe<sub>3</sub>O<sub>4</sub>/MnOOH core-shell nanoparticles by a high-frequency impinging stream reactor

Dongguang Wang; Baikang Zhu; Hengcong Tao

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Preparation of Fe₃O₄/MnOOH core-shell nanoparticles by a high-frequency impinging stream reactor

材料与产品工程 | Updated：2026-01-06

- Preparation of Fe₃O₄/MnOOH core-shell nanoparticles by a high-frequency impinging stream reactor
- Chinese Journal of Chemical Engineering Vol. 23, Issue 4, Pages: 727-735(2015)
- Affiliations：
  
  Petrochemical & Energy Engineering School, Zhejiang Ocean University,Zhoushan,China,316022
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2015
- Accepted：
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摘要

Abstract

Well-defined Fe

/MnOOH nanoparticles with 61.1 emu·g

-1

in magnetization intensity and 90.53 m

·g

-1

in surface area have been synthesized by a new-style of high-frequency impinging stream (HFIS) reactor. In this reactor

two streams first collided together to form nano Fe

suspension

which subsequently flew through an S-shaped main channel to generate high-frequency reversing high-gravity fields. At the same time

24 thin liquid sheets impinged into the main channel at the frequencies higher than 100 Hz to create nano Fe

/ MnOOH colloids. The obtained powders were characterized by transmission electron microscopy/energy dispersive spectrometer (TEM/EDS)

X-ray diffraction (XRD)

Brunner-Emmet-Teller (BET) and vibrating sample magnetometer (VSM). Experimental results indicated that low coating ratio prolonged the induction period of heterogeneous nucleation. The high-frequency impingements of 24 thin liquid sheets greatly accelerated the macro-mixing and the initial dispersion. The high-frequency reversing high-gravity fields promoted the mesoand micro-mixing. As a result

nano Fe

cores were fleet

ly and uniformly covered by MnOOH precursor. As a continuously operated and static high-gravity reactor

the high-frequency impinging stream (HFIS) reactor is being developed to the large-scaled and low-cost production of various nanocomposites.

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Preparation of Fe3O4/MnOOH core-shell nanoparticles by a high-frequency impinging stream reactor

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Preparation of Fe₃O₄/MnOOH core-shell nanoparticles by a high-frequency impinging stream reactor