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Magda's Project Page - RISE summer 2005 |
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Intern: Magda Brzozowska, Warsaw University
Mentor: Jan Andrews
Faculty Supervisor: David Clarke
Department: Materials |
MAGNETIC -POLYMER NANOCOMPOSITES – SYNTHESIS AND CHARACTERIZATION
The studies on the polymer nanocomposites are the answer for the
need of obtaining small electronic devices. The nanocomposites,
which are the aim of this project, consist of Ni0.5Zn0.5FeO2
magnetic particles suspended in polymer (PVDF – polivinylidene
difluoride) matrix. Since ferrite particles have magnetic properties
and polymer has a high dielectric constant they may be used as
a capacitor and inductor in one. Synthesis of ferrite nanoparticles
is performed by aqueous co-precipitation reaction between metal salts
and sodium hydroxide. The main synthesis problem to overcome was the
incompatibility of the polymer even with trace amounts of water while
the ferrite nanoparticles were synthesized in water – based reaction.
The use of surfactants allowed getting a combined solution of ferrite
magnetic particles and polymer in dimethyl formamide (DMF).
Nanocomposites were created by evaporating the solvent on the Petrie
dish. The nanoparticles were characterized by X-ray powdered diffraction
as well as conductivity measurements. The polymer’s properties were
determined by Fourier transform infrared spectroscopy and also X-ray
diffraction. Finally the nanocomposites morphology and structure was
specified by scanning and transmission electron microscopy together
with SQUID and dielectric measurements.
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