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Ultrasonic Nozzle Spray in Situ Mixing and Microwave-Assisted Preparation of Nanocrystalline Spinel Metal Oxides: Nickel Ferrite and Zinc Aluminate
 

Summary: Ultrasonic Nozzle Spray in Situ Mixing and Microwave-Assisted Preparation of
Nanocrystalline Spinel Metal Oxides: Nickel Ferrite and Zinc Aluminate
Edward K. Nyutu, William C. Conner, Scott M. Auerbach,| Chun-Hu Chen, and
Steven L. Suib*,,
Departments of Chemistry and of Chemical, Materials and Bimolecular Engineering, UniVersity of Connecticut,
Storrs, Connecticut 06269, and Departments of Chemical Engineering and of Chemistry, UniVersity of
Massachusetts, Amherst, Massachusetts 01003
ReceiVed: July 18, 2007; In Final Form: October 30, 2007
Nanocrystalline spinel nickel ferrite and zinc aluminate particles (6-20 nm) can be prepared by a recently
developed continuous flow method that combines microwave heating and in situ ultrasonic nozzle spray
mixing. The preparations were carried out at ambient pressure (1 atm), microwave power (0-600 W), and
ultrasonic nozzle with resonant frequency of 48 or 120 kHz. The products were characterized by X-ray
diffraction, field emission scanning electron microscopy, transmission electron microcopy, X-ray electron
dispersive spectroscopy, Brunauer-Emmett-Teller spectroscopy, Raman spectroscopy, Fourier transform
infrared spectroscopy, thermogravimetric analysis, and temperature-programmed desorption mass spectrometry.
The results showed that the ultrasonic nozzle and microwave irradiation complement each other, with respect
to the purity of the products. The specific advantages of INM method for the preparing nickel ferrites are that
pure materials with high surface areas and tunable particle sizes are produced, and this process is continuous.
Introduction
Metal oxide nanoparticles are of great interest due to their

  

Source: Auerbach, Scott M. - Department of Chemistry, University of Massachusetts at Amherst

 

Collections: Chemistry