Behavior of a gas bubble separating from a cavity formed in magnetic fluid in an inhomogeneous magnetic field

Ryapolov, P. A.; Sokolov, E. A.; Postnikov, Eugene B.

doi:10.1016/j.jmmm.2022.169067

Cited by 16 publications

(4 citation statements)

References 30 publications

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“…Directly observing the dynamics of non-magnetic inclusions in magneto-fluidic systems is possible only in thin, optically transparent channels or measuring cells using high-speed video recording systems. An alternative option for studying the dynamics of non-magnetic inclusions, not considered before, may be the acoustic–magnetic indication of magnetization disturbances caused by moving or oscillating liquid or gaseous non-magnetic inclusions in magneto-fluidic systems located in inhomogeneous magnetic fields [ 262 , 263 ].…”

Section: Controlled Active Magneto-fluidic Systemsmentioning

confidence: 99%

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

Ryapolov,

Vasilyeva,

Kalyuzhnaya

et al. 2024

Nanomaterials

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Magnetic fluids were historically the first active nano-dispersion material. Despite over half a century of research, interest in these nano-objects continues to grow every year. This is due to the impressive development of nanotechnology, the synthesis of nanoscale structures, and surface-active systems. The unique combination of fluidity and magnetic response allows magnetic fluids to be used in engineering devices and biomedical applications. In this review, experimental results and fundamental theoretical approaches are systematized to predict the micro- and macroscopic behavior of magnetic fluid systems under different external influences. The article serves as working material for both experienced scientists in the field of magnetic fluids and novice specialists who are just beginning to investigate this topic.

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Section: Controlled Active Magneto-fluidic Systemsmentioning

confidence: 99%

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

Ryapolov,

Vasilyeva,

Kalyuzhnaya

et al. 2024

Nanomaterials

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“…[7][8][9][10] A great variety of micro/nanomotors, which differ in both their structure and composition as well as the motion principles, has been developed. [11][12][13][14][15] The motion of micro/nanomotors can be caused by the action of light, [16] magnetic [17] and electric fields, [18] and chemical reactions. [19,20] The wide research interest in micro/nanomotors is associated with the fact that they can be used to solve many applied problems in medicine, [21] environmental applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Manganese‐Based Micromotors MnFe₂O₄@Fe₃O₄/graphite and Mn₂O₃@Fe₂O₃@Fe₃O₄/graphite for Organic Pollutant Degradation

Kichatov,

Korshunov,

Sudakov

et al. 2023

Advanced Sustainable Systems

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Wastewater pollution with organic compounds poses a serious threat to human health. One of the possible methods for solving these problems can be the use of micro/nanomotors. Among them, manganese‐based micro/nanomotors have a number of important advantages related to high catalytic activity, powerful motion, and low cost. Due to their mobility, micro/nanomotors promote an increase in the intensity of mass transfer in the reacting system. When introducing ferromagnetic elements into manganese‐based micro/nanomotors, it is possible not only to increase their motion speed, but also to make their motion more controllable. Herein, for the first time it demonstrates a synthesis method for MnFe2O4@Fe3O4/graphite and Mn2O3@Fe2O3@Fe3O4/graphite magnetic catalytic micromotors, which have remarkable photocatalytic properties. Micromotors are clusters of nanoparticles whose motion in a hydrogen peroxide solution in a non‐uniform magnetic field is caused by the action of magnetic force and self‐diffusiophoresis. Nanoparticles are synthesized by the plasma‐arc method with subsequent annealing in the air. When changing the annealing temperature, the catalytic and magnetic properties of nanoparticles can vary within a wide range of values. Micromotors MnFe2O4@Fe3O4/graphite have the most optimal catalytic and magnetic properties. The results of the research show that these micromotors are effective catalysts in the decomposition of methylene blue.

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“…A variant of a microfluidic channel with wall-less magnetic confinement due to a magnetic fluid is known [43]. Such a configuration of an inhomogeneous magnetic field using magnetic levitation regions [44] creates prerequisites for the active control of droplet sizes using a magnetic field [45,46]. In previous works, we proposed a new mechanism for controlling the size of droplets that detach from a non-magnetic droplet levitating in a magnetic fluid [47].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Non-Magnetic Droplets and Bubbles in Magnetic Fluids in Microfluidic Channels under the Influence of a Magnetic Field

Kalyuzhnaya,

Sokolov,

Vasilyeva

et al. 2023

Magnetochemistry

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The microfluidics of magnetic fluids is gaining popularity due to the possibility of the non-contact control of liquid composite systems using a magnetic field. The dynamics of non-magnetic droplets and gas bubbles in magnetic fluids were investigated for various configurations of magnetic fields, coatings, and channel geometries, as well as the rate of component supply and their physical properties. Optimal regimes for forming droplet and bubble flows were determined. The mechanism for non-contact control of the size of droplets and bubbles using a magnetic field is proposed in this article. The dependences of the sizes of non-magnetic inclusions in magnetic liquids on the continuous phase flow rate and the displacement of magnets were obtained. The obtained dependences of the volume of non-magnetic inclusions on the flow rate of the continuous phase follow the classic dependences. Changing the size of air bubbles can be achieved by shifting the magnet from −5 mm to +2 mm. The ratio of the maximum and minimum breakaway inclusion varies from 5 to 2 depending on the flow rates of the continuous phase. The range of changing the size of oil droplets with the displacement of magnets is from 1.1 to 1.51. These studies show how, with the help of various mechanisms of influence on microfluidic flows, it is possible to control the size of bubbles and droplets forming in microchannels. The obtained data can be applied for controlled microfluidic dosing and counting devices.

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Behavior of a gas bubble separating from a cavity formed in magnetic fluid in an inhomogeneous magnetic field

Cited by 16 publications

References 30 publications

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

Magnetic Manganese‐Based Micromotors MnFe₂O₄@Fe₃O₄/graphite and Mn₂O₃@Fe₂O₃@Fe₃O₄/graphite for Organic Pollutant Degradation

Dynamics of Non-Magnetic Droplets and Bubbles in Magnetic Fluids in Microfluidic Channels under the Influence of a Magnetic Field

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Behavior of a gas bubble separating from a cavity formed in magnetic fluid in an inhomogeneous magnetic field

Cited by 16 publications

References 30 publications

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

Magnetic Fluids: The Interaction between the Microstructure, Macroscopic Properties, and Dynamics under Different Combinations of External Influences

Magnetic Manganese‐Based Micromotors MnFe2O4@Fe3O4/graphite and Mn2O3@Fe2O3@Fe3O4/graphite for Organic Pollutant Degradation

Dynamics of Non-Magnetic Droplets and Bubbles in Magnetic Fluids in Microfluidic Channels under the Influence of a Magnetic Field

Contact Info

Product

Resources

About

Magnetic Manganese‐Based Micromotors MnFe₂O₄@Fe₃O₄/graphite and Mn₂O₃@Fe₂O₃@Fe₃O₄/graphite for Organic Pollutant Degradation