title: Self-Healing of Core-Shell Magnetic Polystyrene Nanocomposites.
abstract: High heat generation is reported in core-shell magnetic nanoparticle polystyrene (PS) nanocomposites (3.5, 10 wt %) when they are placed in a high-frequency ac magnetic field. These magnetic nanoparticles with cobalt iron oxide core and manganese iron oxide shell were synthesized and characterized by wide-angle X-ray scattering (WAX), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), and ac field gradient magnetometery. When placed in a high-frequency ac magnetic field, the thermal energy generated in the magnetic polystyrene nanocomposites resulted in a surface temperature increase. The heat generation is attributed to the contribution of Néel relaxation and hysteresis of the core-shell magnetic nanoparticles in the solid state. The maximum surface temperature increased with increasing nanoparticle content and resulted in melting of the magnetic polystyrene nanocomposite.
authors.affiliation: †Ohio Aerospace Institute, Cleveland, Ohio 44135, United States.
authors.forename: Mitra
authors.initials: M
authors.lastname: Yoonessi
authors.affiliation: §NASA Glenn Research Center, Cleveland, Ohio 44135, United States.
authors.forename: Bradley A
authors.initials: BA
authors.lastname: Lerch
authors.affiliation: ‡Department of Geosciences, University of Akron, Akron, Ohio 44325, United States.
authors.forename: John A
authors.initials: JA
authors.lastname: Peck
authors.affiliation: §NASA Glenn Research Center, Cleveland, Ohio 44135, United States.
authors.forename: Richard B
authors.initials: RB
authors.lastname: Rogers
authors.affiliation: §NASA Glenn Research Center, Cleveland, Ohio 44135, United States.
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Solá-Lopez
authors.affiliation: §NASA Glenn Research Center, Cleveland, Ohio 44135, United States.
authors.forename: Michael A
authors.initials: MA
authors.lastname: Meador
keywords: magnetic nanoparticles; magnetic polymer nanocomposite; polystyrene; self-healing; smart polymers