Polyurea (PU) nano-capsules have received voluminous interest in various fields due to their biocompatibility, high mechanical properties, and surface functionality. By incorporating magnetic nanoparticle (MNPs) into the polyurea system, the attributes of both PU and MNPs can be combined. In this work, we describe a facile and quick method for preparing magnetic polyurea nano-capsules. Encapsulation of ionic liquid-modified magnetite nanoparticles (MNPs), with polyurea nano-capsules (PU NCs) having an average size of 5–20 nm was carried out through interfacial polycondensation between amine and isocyanate monomers in inverse nano-emulsion (water-in-oil). The desired magnetic PU NCs were obtained utilizing toluene and triple-distilled water as continuous and dispersed phases respectively, polymeric non-ionic surfactant cetyl polyethyleneglycol/polypropyleneglycol-10/1 dimethicone (ABIL EM 90), diethylenetriamine, ethylenediamine diphenylmethane-4,40-diisocyanate, and various percentages of the ionic liquid-modified MNPs. High loading of the ionic liquid-modified MNPs up to 11 wt% with respect to the dispersed aqueous phase was encapsulated. The magnetic PU NCs were probed using various analytical instruments including electron microscopy, infrared spectroscopy, X-ray diffraction, and nuclear magnetic spectroscopy. This unequivocally manifested the successful synthesis of core-shell polyurea nano-capsules even without utilizing osmotic pressure agents, and confirmed the presence of high loading of MNPs in the core.
Bibliographical noteFunding Information:
Funding: This research was funded by the Israel Ministry of Agriculture, [grant number 131-1595].
Acknowledgments: This work was supported by the Chief Scientist, the Israel Ministry of Agriculture grant # 131-1595. We are also grateful to the Ministry of Science, Technology, and Space for the fellowship of Suzana Natour. We thank Inna Popov and Vladimir Uvarov for helping with the TEM and XRD analysis. Suzana Natour thanks Rajashekharayya Sanguramath for productive discussions.
© 2019 by the authors.
- Composite nanomaterials
- Interfacial polymerization
- Magnetic nanoparticles
- Polyurea nano-capsules