Reversible Magnetic Agglomeration: A Mechanism for Thermodynamic Control over Nanoparticle Size

Bleier, Grant C.; Watt, John; Simocko, Chester K.; Lavin, Judith M.; Huber, Dale L.

doi:10.1002/ange.201800959

Title: Reversible Magnetic Agglomeration: A Mechanism for Thermodynamic Control over Nanoparticle Size

Journal Article · Thu Apr 26 00:00:00 EDT 2018 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.201800959· OSTI ID:1434808

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^[2]; Lavin, Judith M. ^[1];

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Sandia National Laboratories Albuquerque NM 87111 USA
Department of Chemistry San Jose State University San Jose CA 95192 USA

Abstract We present a method for the synthesis and precise size control of magnetic nanoparticles in a reversible magnetic agglomeration mechanism. In this approach, nanoparticles nucleate and grow until a critical susceptibility is reached, in which magnetic attraction overcomes dispersive forces, leading to agglomeration and precipitation. This phase change in the system arrests nanoparticle growth and gives true thermodynamic control over the size of nanoparticles. We then show that increasing the alkyl chain length of the surfactant, and hence increasing steric stabilization, allows nanoparticles to grow to larger sizes before agglomeration occurs. Therefore, simply by choosing the correct surfactant, the size and magnetic properties of iron nanoparticles can be tailored for a particular application. With the continuous addition of the precursor solution, we can repeat the steps of nucleation, growth, and magnetic agglomeration indefinitely, making the approach suitable for large scale syntheses.

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Sponsoring Organization:: USDOE

OSTI ID:: 1434808

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 130 Journal Issue: 26; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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