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- Title
Reversible Magnetic Agglomeration: A Mechanism for Thermodynamic Control over Nanoparticle Size.
- Authors
Bleier, Grant C.; Watt, John; Lavin, Judith M.; Huber, Dale L.; Simocko, Chester K.
- Abstract
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.
- Subjects
NUCLEAR magnetic resonance; SURFACE active agents; MAGNETIC particles; X-ray diffractometers; X-ray scattering; NATIONAL Institutes of Health (U.S.)
- Publication
Angewandte Chemie, 2018, Vol 130, Issue 26, p7804
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201800959