Abstract
Magnetic hollow polymethyl methacrylate (PMMA) nanospheres were successfully obtained by etching the template of CaCO 3 in the core–shell Fe 3O 4@CaCO 3@PMMA nanospheres, which were synthesized via in situ emulsion polymerization in the presence of oleic acid-modified Fe 3O 4@CaCO 3 composite nanoparticles. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements demonstrated that the core–shell Fe 3O 4@CaCO 3@PMMA nanospheres were uniform and possessed narrow size distributions. And a perfect spherical profile of magnetic hollow PMMA nanospheres could be also observed by TEM. Both the Fourier transform infrared (FTIR) spectrometry, high resolution TEM (HRTEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) provided the sufficient evidences for the presence of Fe 3O 4 in the magnetic hollow PMMA nanospheres. Thermogravimetric analysis (TGA) investigated the composition of the resulting composite nanospheres. Moreover, the magnetic testing experiment could give us a direct proof of the presence of Fe 3O 4 in magnetic hollow PMMA nanospheres. And the magnetic hollow PMMA nanospheres had a promising future in controlled drug delivery and targeted drug applications.
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