Magnetic agglomeration method for size control in the synthesis of magnetic nanoparticles

DWPI Title: Manufacture of magnetic nanoparticles involves reacting magnetic material precursor and surfactant, growing surfactant-coated magnetic nanoparticles, agglomerating critical-sized magnetic nanoparticles, and precipitating
Abstract: A method for controlling the size of chemically synthesized magnetic nanoparticles that employs magnetic interaction between particles to control particle size and does not rely on conventional kinetic control of the reaction to control particle size. The particles are caused to reversibly agglomerate and precipitate from solution; the size at which this occurs can be well controlled to provide a very narrow particle size distribution. The size of particles is controllable by the size of the surfactant employed in the process; controlling the size of the surfactant allows magnetic control of the agglomeration and precipitation processes. Agglomeration is used to effectively stop particle growth to provide a very narrow range of particle sizes.
Use: Manufacture of magnetic nanoparticles.
Advantage: The method efficiently provides magnetic nanoparticles having excellent chemical characteristics and controlled size.
Novelty: A magnetic material precursor and surfactant (A) are reacted at reaction temperature, and formed magnetic particle core is partially coated with surfactant (A) to obtain surfactant-coated magnetic nanoparticles. The obtained nanoparticles are grown to critical size to obtain critical-sized magnetic nanoparticles capable of spontaneously agglomerating at reaction temperature. The formed critical-sized magnetic nanoparticles are agglomerated, and formed agglomerated critical-sized magnetic nanoparticles are precipitated to obtain magnetic nanoparticles.
Filed: 2/2/2009
Application Number: US2009364261A
Tech ID: SD 11088.0
This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.
Data from Derwent World Patents Index, provided by Clarivate
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