Conclusion
Hydrophilic magnetic nanoparticles with excellent
stability were achieved by adding polymethacrylic
acid during the preparation of
magnetic iron oxide. Such particles dispersed
readily in dilute ammonia and formed a stable
magnetic fluid. In an inverse system, hydrophilic
monomer was dissolved in above magnetic fluid
and the inverse miniemulsion polymerization was
conducted successfully. The experimental results
demonstrate that the inverse miniemulsion polymerization
is an effective way to synthesize
magnetic polymeric particles. The magnetic polymeric
particles are spherical and their size range
from 60 to 160nm depending on the reaction
parameters. The nanosized iron oxide particles can
be well encapsulated in polyacrylamide particles
and the magnetic polymeric particles are superparamagnetic.
These crosslinked magnetic polyacrylamide
particles can be dispersed in water
easily and can be recommended as a candidate for
the biological application.
Acknowledgements
This work was supported by the National
Science Foundation of China (Grant No.
50173005).
References
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[