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Polymeric nanocomposites of complex ferrite

Dokyung Kim 1Muhammet S. Toprak 1Maria Mikhaylova 1Yun-Suk Jo 1Thomas Tsakalakos 2Mamoun Muhammed 1

1. Royal Institute of Technology, Dept of Materials Science and Engineering, Materials Chemistry Division (KTH), Brinellvaegen 23, 2tr., Stockholm SE10044, Sweden
2. Rutgers University, Department of Ceramic and Materials Engineering, Piscataway, New Jersey, NJ 08854, United States


The main objective of this study is to prepare the polymer-ferrite nanocomposites consisting of ferrite nanoparticles embedded in a polymeric matrix that can be used for radar absorption. Thermodynamic modeling of the complex ferrite system has been performed for the controlled coprecipitation by selecting the working pH ranges where all the ions involved in the composite could be precipitated simultaneously. The method employed is very convenient to synthesize the multicomponent systems with a homogenous distribution of compositions.
The ferrite nanoparticles were characterized using several different techniques such as XRD, DSC, TGA, TEM, and SEM. Prepared nanocrystalline complex ferrite powders have been annealed at different temperatures to investigate the effect of annealing temperature on the particle size and crystallinity. Also, an investigation of a colloidal suspension of the complex ferrite was performed by monitoring the distribution of the particles size and the zeta potentials as a function the pH. Dynamic light scattering and ESA were respectively used to measure the isolelectric point (IEP) of the ferrite particles to decide further modifications on the surface of the nanoparticles.
Afterward, the polymer nanocomposites were prepared by dispersing the complex ferrite nanoparticles in a polymeric matrix by sonication. The dispersion experiments were classified as two categories; with or without modifications of the surface of nananoparticles. The effect of surface modifications with silane (APTMS) as a coupling agent and the coating of attachment/conjugation of the ferrite nanoparticles to the polymeric matrix were investigated by FTIR and DSC techniques. The other detailed procedures and properties will be presented during the presentation.


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Presentation: poster at E-MRS Fall Meeting 2003, Symposium F, by Dokyung Kim
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-27 20:13
Revised:   2009-06-08 12:55