Size Selective Synthesis of Superparamagnetic Nanoparticles in Thin Fluids under Continuous Flow Conditions

Authors

  • Suk Fun Chin,

    1. Center for Strategic Nano-Fabrication, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, W.A. 6009 (Australia)
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  • K. Swaminathan Iyer,

    1. Center for Strategic Nano-Fabrication, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, W.A. 6009 (Australia)
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  • Colin L. Raston,

    Corresponding author
    1. Center for Strategic Nano-Fabrication, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, W.A. 6009 (Australia)
    • Center for Strategic Nano-Fabrication, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, W.A. 6009 (Australia).
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  • Martin Saunders

    1. Center for Microscopy, Characterization and Analysis, The University of Western Australia, Crawley, W.A. 6009 (Australia)
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  • The authors are grateful for the financial support for this work by the Australian Research Council, The University of Western Australia, and The University of Malaysia Sarawak. The microscopy analysis was carried out using facilities at the Centre for Microscopy, Characterization and Analysis, The University of Western Australia, which are supported by University, State and Federal Government funding. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

Continuous flow spinning disc processing (SDP), which has extremely rapid mixing under plug flow conditions, effective heat and mass transfer, allowing high throughput with low wastage solvent efficiency, is effective in gaining access to superparamagnetic Fe3O4 nanoparticles at room temperature. These are formed by passing ammonia gas over a thin aqueous film of Fe2+/3+ which is introduced through a jet feed close to the centre of a rapidly rotating disc (500 to 2500 rpm), the particle size being controlled with a narrow size distribution over the range 5 nm to 10 nm, and the material having very high saturation magnetizations, in the range 68–78 emu g−1.

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