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have no competing interests. Authors’ contributions SYL performed the theoretical calculations and overall experiment. The nanoparticles were prepared by JYK, and HJS optimized their physical properties. JYL participated in drafting the manuscript and technical support. SL participated in the design of experiments. KHC participated in the analysis of the optical results. Drafting of the manuscript was carried out by GS. All authors read and approved the final manuscript.”
“Background In the Etofibrate past several decades, magnetic nanomaterials of iron oxides (Fe3O4 NPs) have attracted much research interest due to their potential applications in magnetic storage, catalysis, electrochemistry, drug delivery, medical diagnostics, and therapeutics based on their unique magnetic, physiochemical, and optical properties [1–5]. Among the various methods for the preparation of Fe3O4 NPs, the solvothermal approach is one of great significance [6–9].
Under the solvothermal conditions, Fe3O4 NPs were usually composed of multiple single-domain magnetic nanocrystals. To date, the solvothermal method was developed for the preparation of magnetite spheres with strong magnetization through the hydrolysis and reduction of iron chloride in ethylene glycol at high temperatures. However, producing Fe3O4 NPs with specific functional groups on the surface and acceptable size distribution without particle aggregation has consistently been a problem. Thus, a variety of modifiers were added to the reaction mixtures to control the size of Fe3O4 NPs and improve the colloidal stability and biocompatibility, such as poly(acrylic acid) (PAA) [10], polyethyleneimine (PEI) [11, 12], polyethylene glycol (PEG) [13], and other biocompatible polymers [14, 15]. These modifiers are usually polymers bearing carboxylate or other charged groups.