Density, sound velocity and viscosity properties of aqueous sodium metatungstate solutions and an application of these solutions in heavy mineral separations

We construct a mathematical model describing the equilibrium flotation height of a spherical particle at the interface of immiscible liquids. The behavior of such a system depends on several experimentally measurable parameters, which include surface tensions, densities of all phases, and system scale. These parameters can be absorbed into three quantities that entirely determine the equilibrium position of the particle: the contact angle between the interface and particle, the Bond number, and the ratio of particle buoyant density to liquid phase densities-a new, dimensionless number that we introduce here. This experimentally convenient treatment allows us to make predictions that apply generally to the large parameter space of interesting systems. We find the model is in good agreement with experiments for particle size and interfacial tension spanning 3 orders of magnitude. We also consider the low interfacial tension case of aqueous two-phase systems (ATPSs) theoretically and experimentally. Such systems are more sensitive to changes in density than higher-tension aqueous/organic two-phase systems; we experimentally demonstrate that a millimeter-sized bead in an ATPS can be controllably positioned with between 5.9 and 95.1% of its surface area exposed to the bottom phase, whereas the same bead in an aqueous/organic system is limited to a range of 18.2-61.6%. Finally, we discuss the potential for wettability-based control for micron length-scale particles, which are not sensitive to changes in density. Our results can be used to simply define the experimentally controllable parameters that affect the equilibrium position and the length scales of a particle over which such parameters can be effectively tuned. A complete understanding of these properties is important for a number of applications including colloidal self-assembly and chemical patterning (e.g., formation of desymmetrized or Janus particles). By considering ATPSs, we broaden the potential uses to biological applications such as cell separation and interfacial tissue assembly.

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“…34 Additionally, a very large range of solution densities (ca. 1000−3100 kg/m 3 ) 35 can be made with SMT.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Experimental and Theoretical Validation of System Variables That Control the Position of Particles at the Interface of Immiscible Liquids

2018

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“…Volumetric properties are useful tools in studying the solution behaviour of solutes and reveal valuable information about solute-solvent-cosolute interactions. They include apparent molar volume, apparent molar expansion which is the derivative of volume with respect to temperature and apparent molar compression which is the derivative of volume with respect to pressure [14,15].…”

Section: Introductionmentioning

confidence: 99%

Volumetric properties of (ascorbic acid+polyethylene glycol 3350+water) systems at T=(288.15, 298.15, and 308.15)K

Şahin

Ayrancı́

2011

The Journal of Chemical Thermodynamics

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“…Many researchers have focused on magnetic materials of carbonyl iron, Fe 2 O 3 , and Fe 3 O 4 owing to their potential applications to many new industries and high‐functional devices . In particular, Fe 3 O 4 nanoparticles (magnetite) are used for heat transfer applications, mineral separation, electrophotography, magnetic resonance imaging, dynamic sealing, biosensor, and efficient hyperthermia for cancer therapy . As Fe 3 O 4 contains Fe 2+ and Fe 3+ , Fe 3 O 4 can be oxidized easily and loses its magnetism .…”

Section: Introductionmentioning

confidence: 99%

Core/Shell Polystyrene/Magnetite Hybrid Nanoparticles Fabricated by Pickering Emulsion Polymerization and Their Magnetorheological Response

Chae

Piao

Han

et al. 2018

Macro Chemistry & Physics

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Soft‐magnetic polystyrene (PS)/Fe3O4 core/shell composite nanoparticles are fabricated by surfactant‐free Pickering emulsion polymerization using Fe3O4 nanoparticles as a solid stabilizer. The morphology of the synthesized PS/Fe3O4 particles consisting of a PS surface coated with Fe3O4 nanoparticles is examined by scanning electron microscopy and transmission electron microscopy. The thermal properties of Fe3O4 and PS/Fe3O4 are examined by thermogravimetric analysis, while the chemical bonding and composition of the nanocomposite are characterized by Fourier transform infrared spectroscopy and X‐ray diffraction. The magnetorheological (MR) properties of the PS/Fe3O4 composite nanoparticles dispersed in silicone oil are analyzed using a rotational rheometer under an external magnetic field. The PS/Fe3O4‐based MR fluids exhibit typical MR properties and a lower density compared to Fe3O4 nanoparticles, indicating the improved dispersion stability of the MR fluid compared to that of the Fe3O4 nanoparticle‐based MR fluid.

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Density, sound velocity and viscosity properties of aqueous sodium metatungstate solutions and an application of these solutions in heavy mineral separations

Cited by 15 publications

References 20 publications

Experimental and Theoretical Validation of System Variables That Control the Position of Particles at the Interface of Immiscible Liquids

Experimental and Theoretical Validation of System Variables That Control the Position of Particles at the Interface of Immiscible Liquids

Volumetric properties of (ascorbic acid+polyethylene glycol 3350+water) systems at T=(288.15, 298.15, and 308.15)K

Core/Shell Polystyrene/Magnetite Hybrid Nanoparticles Fabricated by Pickering Emulsion Polymerization and Their Magnetorheological Response

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