The magnetic nanoparticle separation problem

Mandel, Karl; Hutter, Frank

doi:10.1016/j.nantod.2012.05.001

Cited by 58 publications

(39 citation statements)

References 11 publications

(24 reference statements)

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“…Also, the efficiency of separation by a strong magnet was too low to have a good separation. The small size of nanoparticles and functionlisation with surfactants show a great resistance of nanoparticles against separation by a centrifuge or magnet [23].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of stable iron oxide nanoparticle dispersions in high ionic media

Nourafkan

Asachi

Gao

et al. 2017

Journal of Industrial and Engineering Chemistry

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Graphical abstract2 ABSTRACT A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binary base fluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were produced in a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. The effects of temperature and precursor concentration on morphology and size distribution of produced nanoparticles were evaluated. An effective steric repulsion force was provided by the surface functionalization of nanoparticles during the phase transfer, supported by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability against agglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, which make them good candidates for a range of novel applications.

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Section: Resultsmentioning

confidence: 99%

Synthesis of stable iron oxide nanoparticle dispersions in high ionic media

Nourafkan

Asachi

Gao

et al. 2017

Journal of Industrial and Engineering Chemistry

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“…It should also be emphasized that the cooperative magnetophoresis mechanism discussed herein, while enabling the separation of nanoparticles that would be individually nonmagnetically separable, still has a strong built-in size dependence, and does not guarantee the separation of magnetic nanoparticles. For example, it is still controversial whether SPIONs are magnetically separable under low field conditions [20]. Indeed, the main industrial application of SPIONs is as ferrofluids, which are designed to be magnetically inseparable.…”

Section: Challenges For Magnetic Water Treatmentmentioning

confidence: 99%

Magnetically Recyclable Nanomaterials for Water Treatment

Leshuk

2014

Nanotechnology for Water Treatment and Purification

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Nanoparticle colloidal dispersions are highly promising for use in water purification, but practical and cost-effective options to separate the dispersed nanoparticles from the treated water remain a critical roadblock to industrial adoption. Magnetic separation of superparamagnetic nanoparticles from water for recycling and reuse has the potential to be an efficient, practical, and low-cost slurry-type water treatment method. In this chapter we review the fundamental theory and concepts of magnetic nanoparticle separations, and present both a synthesis process for size-tunable superparamagnetic iron oxide nanospheres, as well as the application of these nanospheres as a core material for the immobilization of TiO 2 , to be used in photocatalytic water treatment as magnetically recyclable composite particles.

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“…Alternatively, various techniques are available to extract the desired core size fraction from a polydisperse sample or to at least narrow down the core size range of particles in a preparation. The first method that comes to mind is magnetic separation [4,9,35,46,81] and was used to improve the MPI performance of DDM128, a magnetic fluid very similar to Resovist ® [42]. A limitation of magnetic separation is that large particles (core size > 30 nm) might aggregate irreversibly when a moderate magnetic field is applied.…”

Section: Core Size Distributionmentioning

confidence: 99%

Synthetic routes to magnetic nanoparticles for MPI

Kratz

Eberbeck

Wagner

et al. 2013

Biomedizinische Technik/Biomedical Engineering

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Magnetic particle imaging (MPI) is a new imaging technique for visualizing the three-dimensional distribution of superparamagnetic iron oxide nanoparticles with specific properties (MPI tracers). Initial results obtained with MPI using superparamagnetic iron oxide as blood pool markers suggest that the method has great potential for cardiovascular imaging. Conversely, no clinically approved MPI tracers currently exist that could be used to exploit this potential of MPI. This article describes thermal decomposition and coprecipitation, two relevant methods for synthesizing and optimizing superparamagnetic iron oxide nanoparticles for MPI. Furthermore it summarizes the recent literature on MPI tracers and explores what can be learned from structural studies with Resovist(®) for novel synthesis approaches.

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The magnetic nanoparticle separation problem

Cited by 58 publications

References 11 publications

Synthesis of stable iron oxide nanoparticle dispersions in high ionic media

Synthesis of stable iron oxide nanoparticle dispersions in high ionic media

Magnetically Recyclable Nanomaterials for Water Treatment

Synthetic routes to magnetic nanoparticles for MPI

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