Monitoring colloidal stability of polymer-coated magnetic nanoparticles using AC susceptibility measurements

Journal of Colloid and Interface Science
Adriana P HerreraCarlos Rinaldi

Abstract

The application of the response of magnetic nanoparticles to oscillating magnetic fields to probe transitions in colloidal state and structure of polymer-coated nanoparticles is demonstrated. Cobalt ferrite nanoparticles with narrow size distribution were prepared and shown to respond to oscillating magnetic fields through a Brownian relaxation mechanism, which is dependent on the mechanical coupling between the particle dipoles and the surrounding matrix. These nanoparticles were coated with covalently-attached poly(N-isopropylacrylamide) (pNIPAM) or poly(N-isopropylmethacrylamide) (pNIPMAM) through free radical polymerization. The temperature induced transitions of colloidal suspensions of these nanoparticles were studied through a combination of differential scanning calorimetry (DSC), dynamic light scattering (DLS), and AC susceptibility measurements. In the pNIPAM coated nanoparticles excellent agreement was found for a transition temperature of approximately 30 degrees C by all three methods, although the AC susceptibility measurements indicated aggregation which was not evident from the DLS results. Small-angle neutron scattering (SANS) results obtained for pNIPAM coated nanoparticles confirmed that aggregation indeed oc...Continue Reading

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Citations

Dec 25, 2012·Archives of Pharmacal Research·Phuong Ha-Lien TranBeom-Jin Lee
Dec 6, 2014·Journal of Magnetism and Magnetic Materials·Bradley W FickoSolomon G Diamond
Jul 1, 2015·Biomedizinische Technik. Biomedical Engineering·Bradley W FickoSolomon G Diamond
Oct 21, 2011·Macromolecular Bioscience·Samer R AbulateefehCameron Alexander
Dec 17, 2014·Journal of Magnetism and Magnetic Materials·Bradley W FickoSolomon G Diamond
Sep 14, 2013·International Journal of Molecular Sciences·Yimeng DuPhilip W T Pong
Jul 28, 2017·Journal of Colloid and Interface Science·Ana C BohórquezCarlos Rinaldi
Dec 15, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Kathleen DavisO Thompson Mefford
Oct 1, 2019·Analytical Chemistry·Sarah E SandlerO Thompson Mefford

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