Magnetically Controlled Contact Angle of Ferrofluid Encapsulated Water Droplet

Nair, Nishant; Jani, Snehal

doi:10.1166/jon.2018.1421

Cited by 3 publications

(2 citation statements)

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“…Kerosene based ferrofluid utilized in the present work was synthesized using well known chemical co precipitation technique and elaborative discussion regarding the same has been given in our earlier published studies [23,24]. The primary structural and magnetic parameters of the used ferrofluid have been reiterated here for reference information.…”

Section: Methodsmentioning

confidence: 99%

Magnetic Nanoparticles as Controlling Agents of Chain Structures in a Rotating Magnetic Field

Nair¹,

Jani²,

Brajpuriya³

2023

J. Nano- Electron. Phys.

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Chain formation in magnetic fluid has been observed under the influence of a rotating magnetic field. The influence on the chain flexibility and its rupture was studied by varying the frequency of rotation (1-5 Hz) of the magnetic field of a fixed magnitude (50 Gauss). Micrometer sized Fe3O4 particles and nonmagnetic expancel spheres of fixed concentration were later suspended in the magnetic fluid separately and their effect on the chain rotation dynamics was studied. It was observed that the critical frequency for the chain breakage was higher in the presence of larger magnetic particles compared to magnetic fluid alone. Non-magnetic particles formed chain structures in the presence of a static field but did not show any response to the rotation of the magnetic field. The established theory of magnetic chain formation was used to study and discuss the results by comparing the magnetic forces and viscous forces. The study may be useful for controlling chain length and flexibility in microfluidics.

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Section: Methodsmentioning

confidence: 99%

Magnetic Nanoparticles as Controlling Agents of Chain Structures in a Rotating Magnetic Field

Nair¹,

Jani²,

Brajpuriya³

2023

J. Nano- Electron. Phys.

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“…[21] Up to date, magnetic mani pulation commonly relies on loading magnetic particles inside [22,23] or outside of the droplet to move (magnetic liquid marbles and cloaked droplet), [24][25][26][27] ) or on magneto responsive surfaces. [28] Ferrofluids have been already used as magnetic soft substrates [29][30][31][32][33] to induce a change in the interaction between droplets and substrates enabling droplet manipulation. Despite all the progress in droplet microfluidics, a number of challenges remain in the field such as its applicability for wide range of droplet volumens and the possibility to avoid fabrication of complex substrates.…”

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confidence: 99%

Tunable Superparamagnetic Ring (tSPRing) for Droplet Manipulation

Nasirimarekani

Benito‐Lopez

Basabe‐Desmonts

2021

Adv Funct Materials

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The manipulation of droplets via a magnetic field forms the basis of a fascinating technology that is currently in development. Often, the movement of droplets with magnets involves adding magnetic particles in or around the droplet; alternatively, magneto responsive surfaces may also be used. This work, presents and characterizes experimentally the formation and properties of a tunable superparamagnetic ring (tSPRing), which precisely adjusts itself around a water droplet, due to liquid–liquid interaction, and enables the physical manipulation of droplets. The ring is made of an oil‐based ferrofluid, a stable suspension of ferromagnetic particles in an oily phase. It appears spontaneously due to the oil–water interfacial interaction under the influence of a magnetic field. The ferrofluid–water interaction resembles a cupcake assembly, with the surrounding ring only at the base of the droplet. The ring is analogous to a soft matter ring magnet, showing dipole repulsive forces, which stabilizes the droplets on a surface. It enables robust, controllable, and programmable manipulation of enclosed water droplets. This work opens the door to new applications in open surface upside or upside‐down microfluidics and lays the groundwork for new studies on tunable interfaces between two immiscible liquids.

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