Abstract
Nowadays, there is a demand in the production of nontoxic multifunctional magnetic materials possessing both high colloidal stability in water solutions and high magnetization. In this work, a series of water-dispersible natural humate-polyanion coated superparamagnetic magnetite nanoparticles has been synthesized via microwave-assisted synthesis without the use of inert atmosphere. An impact of a biocompatible humate-anion as a coating agent on the structural and physical properties of nanoparticles has been established. The injection of humate-polyanion at various synthesis stages leads to differences in the physical properties of the obtained nanomaterials. Depending on the synthesis protocol, nanoparticles are characterized by improved monodispersity, smaller crystallite and grain size (up to 8.2 nm), a shift in the point of zero charge (6.4 pH), enhanced colloidal stability in model solutions, and enhanced magnetization (80 emu g−1).
Highlights
The use of magnetic nanoparticles has been attracting a lot of interest lately, and today such materials are used for various applications, such as toxic contaminant removal, catalysis [1,2,3,4,5,6], electronics [7,8,9], and medicine
Based on electron microscopy and x-ray diffraction data, we can conclude that the sample obtained via microwave-assisted synthesis exhibits a higher monodispersity
We have found the opposite effect as a result of the synthesis of the MW-Humic substances (HSs)-1, MW-HS-2 samples
Summary
The use of magnetic nanoparticles has been attracting a lot of interest lately, and today such materials are used for various applications, such as toxic contaminant removal, catalysis [1,2,3,4,5,6], electronics [7,8,9], and medicine. The most widely applied examples of magnetic materials are magnetite (Fe3O4) and maghemite (γ-Fe2O3), which are used in medicine for diagnostics and the treatment of oncological diseases, drug delivery, etc. The most commonly used synthesis method remains to be the classical precipitation of Fe3+ and Fe2+ from water solutions by ammonia. This approach is simple, highly efficient, and relatively fast. It has several well-known disadvantages, mainly a wide size distribution of prepared nanoparticles, and as a result, differences in the physical properties due to the “size effect”
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