Abstract
Organocatalysis by 4-N,N-dimethylaminopyridine was employed for ring opening polymerization of lactide initiated at magnetic nanoparticles covered by glycerol phosphate or ascorbic acid phosphate. The resulting magnetite–polylactic acid nanoparticles exhibit high colloidal stability in water and alcohol. Their morphology was investigated by transmission electron microscopy and the chemical structure was elucidated by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The increase in mass after coating the nanoparticles was determined by thermogravimetric analysis, while dynamic light scattering revealed the increase in hydrodynamic size. Magnetic measurements revealed superparamagnetic behavior and high magnetization values. The magnetite–polylactic acid nanoparticles were further used for magnetic tagging of biotin.
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Acknowledgments
The authors wish to acknowledge Dr. Ioan Bratu for FTIR measurements, Dr. Cristian Leostean for conducting magnetic measurements, Dr. Lucian Barbu for TEM investigations, Camelia Daia for DLS measurements. This study was supported by the Romanian Ministry of Education and Research under the research project PN-II-RU-TE-2011-3-0130.
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Nan, A., Leistner, J. & Turcu, R. Magnetite–polylactic acid nanoparticles by surface initiated organocatalysis ring opening polymerization. J Nanopart Res 15, 1869 (2013). https://doi.org/10.1007/s11051-013-1869-x
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DOI: https://doi.org/10.1007/s11051-013-1869-x