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Fractional factorial design for the optimization of hydrothermal synthesis of lanthanum oxide nanoparticles under supercritical water condition

Jafari Nejad, Sh ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1016/j.supflu.2010.01.013
  3. Publisher: 2010
  4. Abstract:
  5. In this research, synthesis of lanthanum oxide nanoparticles using supercritical water as a reaction medium in batch type reactor was studied. The crystallographic identity and morphology of the synthesized nanoparticles were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The XRD patterns indicate that the well-crystallized lanthanum oxide nanocrystals can be easily obtained under the current synthetic conditions. The effect of four parameters includes temperature, reaction time; primary concentration of aqueous solution of lanthanum (III) nitrate and pH of starting solution on reaction efficiency, particle size and the BET surface area were investigated using 24-1 fractional factorial design. Finally, by employing a regression analysis a model based on effect of significant main variables and their binary interactions was proposed which can predict the percentage of reaction efficiency with acceptable confidence
  6. Keywords:
  7. Lanthanum oxide nanoparticles ; Aqueous solutions ; Batch type reactor ; BET surface area ; Binary interactions ; Concentration of ; Factorial design ; Fractional factorial designs ; Lanthanum oxide ; Model-based ; Reaction efficiency ; Reaction medium ; Reaction time ; Starting solutions ; Supercritical water ; Supercritical water conditions ; Synthetic conditions ; TEM ; XRD patterns ; Design ; Hydrothermal synthesis ; Lanthanum ; Lanthanum alloys ; Morphology ; Nanoparticles ; pH effects ; Regression analysis ; Scanning electron microscopy ; Transmission electron microscopy ; X ray diffraction ; X ray diffraction analysis ; Lanthanum oxides
  8. Source: Journal of Supercritical Fluids ; Volume 52, Issue 3 , 2010 , Pages 292-297 ; 08968446 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0896844610000458