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Interface dominated dielectric response of PS-Fe3O4 patchy microspheres.

08:00 EDT 27th September 2019 | BioPortfolio

Summary of "Interface dominated dielectric response of PS-Fe3O4 patchy microspheres."

Polymeric-inorganic interface plays a vital role in enhancing dielectric properties of patchy microspheres, Janus particles, and nanocomposites. We performed the computational modelling and simulations along with the experiments to understand the phenomena behind the improved dielectric permittivity of polystyrene-iron oxide (PS-Fe3O4) patchy microspheres. We addressed the fundamental insights on the role of the interfacial region on the dielectric properties. Based on the experimental outcomes and computational simulations on dielectric behavior including polarization and electric field formation, we proposed a new mechanism of charge buildup at the interface. Computational results reveal that the creation of interface bound charges at the inorganic-polymeric interface is responsible for the improved dielectric properties. We also fabricated PS-Fe3O4 patchy microspheres by Pickering emulsion polymerization using Fe3O4 particles as a solid stabilizer. The microstructure, composition, morphology, dielectric and thermal properties of the synthesized patchy PS-Fe3O4 particles were investigated. The dielectric permittivity (k) of neat PS increased from ~2.9 to 14.8 after decorating with Fe3O4 particles. Impedance response of the patchy microspheres shows that the interface of PS-Fe3O4 stores more charges than bulk PS-Fe3O4. The dielectric behavior of patchy microspheres can be engineered by tuning the shape and position of the patches. Polymer-inorganic interface studies provide insight into the mechanisms that control dielectric permittivity and nonlinear conduction in an applied electric field.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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