Well-dispersed magnetic Nano-particles (MNP) were successfully prepared inside the spherical polyelectrolyte brushes (SPB) as nano-reactors.  Firstly, the spherical poly(acrylic acid) (PAA) brushes on a polystyrene core with a total size of ca. 150 nm were synthesized by photo-emulsion polymerization. Being able to absorb and concentrate positive metal ions due to the Donnan effect, these SPBs are ideal nano-reactors to prepare nano-sized magnetite particles. MNPs were thus synthesized in-situ via co-precipitation method with ammonia as a co-precipitator in the SPBs. The MNPs were well-dispersed in SPBs with a narrow-distributed size of 3-5 nm in diameter as observed by HRTEM.  The PAA brushes with MNPs are pH and salt concentration responsive.

Synthesis of magnetic nanoparticles in spherical polyelectrolyte brush as nanoreactor

240th National Meeting (2010)

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