Abstract
We propose and demonstrate a facile room-temperature synthetic method for obtaining water-soluble magnetic Fe 3O 4 nanoparticles (NPs) by combining the in situ synthesis and decomposition of a magnetic polymer hydrogel. The Fe 3O 4 NPs with average diameters of 6.3–8.3 nm were synthesized in a cross-linked polyacrylamide (PAAm) hydrogel by coprecipitating iron ions. The decomposition of the magnetic polymer hydrogel by an aqueous solution of sodium hydroxide led to the transfer of Fe 3O 4 NPs into the aqueous medium. The NPs can be dispersed stably in water for more than three months. The Fe 3O 4 NPs were characterized by X-ray photoelectron spectra (XPS), X-ray powder diffraction (XRD), transmission electron microscope (TEM), and Fourier transform infrared spectroscopy (FT-IR). The saturation magnetization of the Fe 3O 4 NPs was 44.6 and 54.7 emu g −1 at 300 K and 5 K, respectively. The dried magnetic Fe 3O 4 NPs were easily dispersed in alkaline aqueous media (pH > ∼8) and kept stable for a long time. This room-temperature synthetic method for water-soluble magnetic Fe 3O 4 NPs can be expected for wide applications in the preparation of functional water-soluble NPs, such as those used in metals and semiconductors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
