0
SPECIAL ISSUE ON NANOMANUFACTURING

A Statistical Analysis to Control the Growth of Cobalt Ferrite Nanoparticles Synthesized by the Thermodecomposition Method

[+] Author and Article Information
Victoria L. Calero-DdelC, Ana M. Gonzalez, Carlos Rinaldi

Department of Chemical Engineering, University of Puerto Rico, Mayagüez, PR 00681

J. Manuf. Sci. Eng 132(3), 030914 (Jun 09, 2010) (7 pages) doi:10.1115/1.4001717 History: Received June 10, 2009; Revised April 17, 2010; Published June 09, 2010; Online June 09, 2010

A statistical design of experiments was used to study the effect of reaction temperature and time on the synthesis of cobalt ferrite nanoparticles by the thermodecomposition method. A 242 factorial experimental design with two central points was used in which the control variables were the time and temperature of the nucleation and growth stages. Transmission electron microscopy, X-ray diffraction, inductively coupled plasma optical emission spectroscopy, and magnetic measurements were used for particle characterization. Cobalt-substituted ferrite (CoxFe3xO4) nanoparticles with diameters between 9 nm and 13 nm were obtained by varying the nucleation temperature between 150°C and 250°C, the growth temperature between 300°C and 330°C, and the time in each stage between 60 min and 120 min. Statistical analysis showed that only the temperatures had an influence on the final particle size. The analysis of variance indicates that increase in the nucleation temperature resulted in decreased particle size, whereas the increase in temperature in the growth stage resulted in an increase in particle size. Additionally, statistical analysis showed that the growth temperature had an effect on Fe/Co ratio. An increase in the growth temperature produces a decrease in the Fe/Co ratio. Finally, a statistically significant correlation was found between particle diameter and saturation magnetization at 5 K and 300 K. No correlation was found between diameter and other magnetic properties.

FIGURES IN THIS ARTICLE
<>
Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Schematic of thermodecomposition procedure using nucleation and growth steps

Grahic Jump Location
Figure 4

Magnetization curves for cobalt-substituted ferrite synthesized by thermodecomposition: synthesis conditions are (a) T1=150°C, t1=120 min and T2=300°C, t2=120 min; (b) T1=150°C, t1=120 min and T2=330°C, t2=60 min; (c) T1=250°C, t1=60 min and T2=330°C, t2=60 min; and (d) T1=250°C, t1=60 min and T2=300°C, t2=120 min

Grahic Jump Location
Figure 2

TEM images of cobalt ferrite nanoparticles synthesized by the thermodecomposition method for various nucleation (T1) and growth (T2) temperatures and nucleation (t1) and growth (t2) times: (a) T1=150°C, t1=120 min and T2=300°C, t2=120 min; (b) T1=150°C, t1=120 min and T2=330°C, t2=60 min; (c) T1=250°C, t1=60 min and T2=330°C, t2=60 min; and (d) T1=250°C, t1=60 min and T2=300°C, t2=120 min

Grahic Jump Location
Figure 3

X-ray diffraction patterns of cobalt ferrite nanoparticles synthesized by the thermodecomposition method: synthesis conditions are (a) T1=150°C, t1=120 min and T2=300°C, t2=120 min; (b) T1=150°C, t1=120 min and T2=330°C, t2=60 min; (c) T1=250°C, t1=60 min and T2=330°C, t2=60 min; and (d) T1=250°C, t1=60 min and T2=300°C, t2=120 min

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In