Reciprocating Oscillation of a Floating Ferrofluid Marble Triggered by Magnetic Fields

Yang, Jinfang; He, Yongqing; Feng, Jing; Wang, Ming

doi:10.1021/acs.langmuir.2c02531

Cited by 5 publications

(3 citation statements)

References 56 publications

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“…67 Yang et al investigated the reciprocating motion of ferrofluid marbles floating on the water surface. 68 Despite the studies carried out on the physics of ferrofluid marbles, the free oscillation of these liquid marbles under magnetic stimuli is still not investigated. Herein, for the first time, the free vertical oscillation of ferrofluid marbles, which are initially deformed by an external magnetic field generated by an electromagnet, is experimentally studied.…”

Section: ■ Introductionmentioning

confidence: 99%

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Vibration and Jumping of Ferrofluid Marbles under an Initial Magnetic Perturbation

et al. 2023

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Liquid marbles are being promoted as a replacement for conventional droplets in digital microfluidics. Liquid marbles can be remotely controlled by an external magnetic field if ferrofluid is utilized as their liquid cores. In this study, the vibration and jumping of a ferrofluid marble is experimentally and theoretically investigated. An external magnetic field is utilized to induce deformation in a liquid marble and an increase in its surface energy. As the magnetic field is switched off, the stored surface energy converts to gravitational potential and kinetic energies until it is dissipated. An equivalent linear mass-spring-damper system is used to study the vibration of the liquid marble, and the effect of its volume and initial magnetic stimulus on the vibrational characteristics, such as natural frequency, damping ratio, and deformation of the liquid marble, is experimentally examined. By analyzing these oscillations, the effective surface tension of the liquid marble is evaluated. Also, a novel theoretical model is proposed to obtain the damping ratio of the liquid marble, suggesting a new tool for the measurement of liquid viscosity. Interestingly, it is observed that the liquid marble jumps from the surface in the case of high initial deformation. Based on conservation law of energy, a theoretical model for predicting the liquid marbles jumping height and the boundary between jumping and non-jumping zones in terms of nondimensional numbers, namely, magnetic and gravitational Bond numbers and Ohnesorge number, is proposed with an acceptable error compared to experimental data.

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Section: ■ Introductionmentioning

confidence: 99%

“…Azizian et al studied the collision of a ferrofluid marble with a water marble and examined the potential of using this collision for manipulating non-magnetic liquid marbles . Yang et al investigated the reciprocating motion of ferrofluid marbles floating on the water surface …”

Section: Introductionmentioning

confidence: 99%

Vibration and Jumping of Ferrofluid Marbles under an Initial Magnetic Perturbation

et al. 2023

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“…甚至完成聚结的操作. 而对弹珠与液滴的碰撞行为基底上摩擦系数变小 [30] , 对应的摩擦造成的能量耗散相对较小 [31,32] , 当然这个过程极其短暂, 对动能的耗散影响甚微, 动能更多地是转化为液滴的表面能以及液滴的形态振荡的摇摆中. 对于弹珠在运动过程中所受到的摩擦力, 如图3(c)所示, 由于弹珠在运动的过程中接触面积时刻变化, 摩擦力的计算不再适用于Amontons摩擦定律, 通常由接触角的变化间接计算 [33] : , D为弹珠底部接触区域长度.…”

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Influence factors and kinetic analysis of liquid marbles colliding with sessile droplets

Yang¹,

He²,

Feng³

et al. 2023

Acta Phys. Sin.

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Liquid marbles can be employed as micro-droplet carriers due to their non-wetting, non-adhesion, and selective material exchange with the outside environment, widely engaged in emerging fields like microfluidics and chemical, biological, and chemical microreactors. The collision can be used as a manipulation method for material transfer by marbles, which has significance and research value. Different from droplet-droplet or marble-marble collisions, the collision behavior between marbles and droplets is more abundant and complex. The study of this process is vital for the effective transfer of material with marble as the medium. This paper used high-speed camera filming technology to capture the collision process between liquid marbles and sessile droplets. The collision process between marbles and droplets was investigated for different Ohnesorge numbers (Oh) and wall hydrophilicity/hydrophobicity (contact angle:θ~35.4°-124.5°). This research demonstrates that at the hydrophilic interface, the contact angle formed between the droplet and the interface is small (θ≤61.3°), and when the collision occurs, the effective contact area is small, which cannot form a larger obstruction to the forward motion of the marble and ends the collision with the droplet in the form of overturning; when the hydrophobic interface is changed to the hydrophobic interface, the effective collision area increases, which forms a larger obstruction to the forward motion of the marble and replaces overturning with rebound behavior; when the hydrophobicity of the interface is increased to θ=124.5°, before and after the collision, the flow state of the marble (before impacting:We~1.2-11.0,Re~808-2130; after impacting:We<1,Re≤200) and the droplet (after impacting:We~1.5-3.1, Re~666-960) then changes, the effective collision area is larger, and the fluctuations generated at the interface after the collision cause the particles on the surface of the marble to migrate and appear exposed area, forming liquid bridge and then quickly completing the aggregation. When marbles and sessile droplets collide, three distinct motion behaviors emerge:climbing, rebound, and coalescence-merging (coalescence).

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Tunable particle shells of thermo-responsive liquid marbles under alternating magnetic field

Bielas,

Kubiak,

Kopčanský

et al. 2023

Journal of Molecular Liquids

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Reciprocating Oscillation of a Floating Ferrofluid Marble Triggered by Magnetic Fields

Cited by 5 publications

References 56 publications

Vibration and Jumping of Ferrofluid Marbles under an Initial Magnetic Perturbation

Vibration and Jumping of Ferrofluid Marbles under an Initial Magnetic Perturbation

Influence factors and kinetic analysis of liquid marbles colliding with sessile droplets

Tunable particle shells of thermo-responsive liquid marbles under alternating magnetic field

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