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        Synthesis of stable iron oxide nanoparticle dispersions in high ionic media

        Ehsan Nourafkan,Maryam Asachi,Hui Gao,Ghulum Raza,Dongsheng Wen 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-

        A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binarybasefluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were producedin a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. Theeffects of temperature and precursor concentration on morphology and size distribution of producednanoparticles were evaluated. An effective steric repulsion force was provided by the surfacefunctionalization of nanoparticles during the phase transfer, supported by the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability againstagglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, whichmake them good candidates for a range of novel applications.

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