Magnetic Liquid Marbles: Manipulation of Liquid Droplets Using Highly Hydrophobic Fe<sub>3</sub>O<sub>4</sub> Nanoparticles

Zhao, Yan; Fang, J.; Wang, Hongxia; Wang, Xungai; Lin, Tong

doi:10.1002/adma.200902512

Cited by 304 publications

(289 citation statements)

References 25 publications

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“…At the colloidal scale, methods for producing particlecovered interfaces rely on emulsification where particles are trapped by rapidly moving interfaces during phase separation 16 or droplet formation 17,18 . Above the colloidal scale, formation methods remain scarce and mainly consist of rolling droplets on beds of grains 14,19,20 . Our new method allows for a rapid and continuous production of droplets.…”

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confidence: 99%

Gravity-induced encapsulation of liquids by destabilization of granular rafts

et al. 2013

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Droplets and bubbles coated by a protective armour of particles find numerous applications in encapsulation, stabilization of emulsions and foams, and flotation techniques. Here we study the role of a body force, such as in flotation, as a means of continuous encapsulation by particles. We use dense particles, which self-assemble into rafts, at oil-water interfaces. We show that these rafts can be spontaneously or controllably destabilized into armoured oil-inwater droplets, which highlights a possible role for common granular materials in environmental remediation. We further present a method for continuous production and discuss the generalization of our approach towards colloidal scales.

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confidence: 99%

Gravity-induced encapsulation of liquids by destabilization of granular rafts

et al. 2013

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“…By virtue of the water-repellent and low-adhesive properties of the superhydrophobic pedestals, liquid droplets can be held and moved at will, and such manipulation facilitates the harvesting of valuable materials formed in limited amounts. The process of directly manipulating a water droplet can be performed without the aid of functional additives [26][27][28] such as Janus silica particles or Fe 3 O 4 nanoparticles, and/or applied force fields [29][30][31][32] such as magnetic, electrical or optical. Since no additives are required, on-demand droplet movements are possible without any possibility of contamination.…”

Section: On-demand Manipulation Of Droplets On Superhydrophobic Pedesmentioning

confidence: 99%

A miniature droplet reactor built on nanoparticle-derived superhydrophobic pedestals

Wang

Song

et al. 2010

Nano Res.

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The capability to design and modulate materials, shapes, heat transfer, and mass mixing during the process of developing chemical reactors has allowed researchers to explore millions of chemical reactions and assays. However, despite the advantages in engineering array-based microreactors or microfluidic systems, the wetting attachment between solutions of reagents/products and the glass or polymer substrates of containers leads to difficulties in collecting products effectively and preventing channel blockage. Herein we present a miniature droplet reactor which takes advantage of the anti-wetting and low-adhesive properties of nanoparticle-derived superhydrophobic pedestals, allowing aqueous droplets to be manipulated freely but also providing a confined environment for performing a series of aqueous phase chemical reactions on a small scale. Gas-or precipitateforming reactions can also be performed inside this miniature reactor. Most importantly, reaction products in liquid, solid or gaseous states can be collected effectively, which allows the harvesting of valuable products formed in limited amounts. Such a miniature reactor built on superhydrophobic pedestals provides a new way of performing common chemical reactions and may open the door to the design of next-generation microreaction systems.

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“…Recent studies on functional nano/microchannel structures have demonstrated excellent strategies for design flexibility and smart devices for the control and transfer of liquid droplets. [1][2][3][4][5][6] External actuating forces, including pressure differences, electric fields, thermal gradients, and acoustic stimulation, have been applied in nano/microchannel fluidic devices to control the movement of liquid droplets. [7][8][9][10][11][12][13] It has been successfully demonstrated that the droplets tend to move free of loss if superhydrophobic (to water-based liquid) or superoleophobic (to oil-based liquid) surfaces are used in air.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface

Feng

Hao

et al. 2016

Phys. Chem. Chem. Phys.

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L. (2016). Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface. Physical Chemistry Chemical Physics, 18 (24), 16202-16207.Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface AbstractThe transport of fluids at functional interfaces, driven by the external stimuli, is well established. The lossless transport of oil-based fluids under water remains a challenge, however, due to their high stickiness towards the surface. Here, a superhydrophilic and underwater superoleophobic tri-phase water/oil/solid nanoarray surface has been designed and prepared. The unique tri-phase surface exhibits underwater superoleophobic properties with an extremely low stickiness towards oil-based fluids. The magnetic-field-driven manipulation and transport of oil-based magnetic fluids are demonstrated under water, which opens up a new pathway to design flexible and smart devices for the control and transfer of liquid droplets by using tri-phase systems. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsFeng, H., Xu, X., Hao, W., Du, Y., Tian, D. & Jiang, L. (2016). Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface.

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Magnetic Liquid Marbles: Manipulation of Liquid Droplets Using Highly Hydrophobic Fe₃O₄ Nanoparticles

Cited by 304 publications

References 25 publications

Gravity-induced encapsulation of liquids by destabilization of granular rafts

Gravity-induced encapsulation of liquids by destabilization of granular rafts

A miniature droplet reactor built on nanoparticle-derived superhydrophobic pedestals

Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface

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Magnetic Liquid Marbles: Manipulation of Liquid Droplets Using Highly Hydrophobic Fe3O4 Nanoparticles

Cited by 304 publications

References 25 publications

Gravity-induced encapsulation of liquids by destabilization of granular rafts

Gravity-induced encapsulation of liquids by destabilization of granular rafts

A miniature droplet reactor built on nanoparticle-derived superhydrophobic pedestals

Magnetic field actuated manipulation and transfer of oil droplets on a stable underwater superoleophobic surface

Contact Info

Product

Resources

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Magnetic Liquid Marbles: Manipulation of Liquid Droplets Using Highly Hydrophobic Fe₃O₄ Nanoparticles