Microfluidic magnetic switching valves based on aggregates of magnetic nanoparticles: Effects of aggregate length and nanoparticle sizes

Jiemsakul, Thanakorn; Manakasettharn, Supone; Kanharattanachai, Sivakorn; Wanna, Yongyuth; Wangsuya, S.; Pratontep, Sirapat

doi:10.1016/j.jmmm.2016.09.040

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…The motion of a magnetic fluid based on nanosphere chains was considered to be a Stokes flow and the Reynolds number was 0 . The fluid resistance of the nanosphere chain was proportional to the relative velocity: F d = − 3 πη d ξ N u c where u c was the relative velocity of the center of the nanosphere chain.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…The magnetic fluids based on chains displayed a stabler antisedimentation and a stronger MR effect under low magnetic flux than those based on spheres . Studies of the MR effect of magnetic fluids with nanosphere chains indicated that the geometry had a strong effect on mechanical properties …”

Section: Introductionmentioning

confidence: 99%

“…13 Studies of the MR effect of magnetic fluids with nanosphere chains indicated that the geometry had a strong effect on mechanical properties. 16 There were four main methods used to discuss the MR effect of magnetic fluid: the Monte Carlo method, machine learning, computational fluid dynamics, and particle dynamics method. 17−23 The Monte Carlo method was used to study the regime of aggregate structures of magnetic fluids.…”

Section: ■ Introductionmentioning

confidence: 99%

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Nanosphere Chain Model of Magnetic Fluid and Its Dynamic Performance

Wang,

Liu,

Lian

et al. 2024

Langmuir

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The magnetorheological effect is a critically important mechanical property of magnetic fluids. Accurately capturing the macroscopic properties of magnetorheological fluids with elongated particle forms, such as nanosphere chains, remains a challenging task, particularly due to the complexities arising from particle asymmetry. Traditional particle dynamics primarily utilize spherical particles as computational units, but this approach can lead to significant inaccuracies, especially when analyzing nonspherical magnetorheological fluids, due to the neglect of particle asymmetry. In this work, an advanced particle dynamics model has been developed by integrating the rotation and collision of these asymmetric particles, specifically tailored for the configuration of nanosphere chains. This model exhibits a significant reduction in error by a factor of 3.883, compared to conventional particle models. The results demonstrate that alterations in the geometric characteristics of magnetic nanosphere chains can cause changes in mesoscopic structures and magnetic potential energy, thereby influencing the mechanical properties at the macroscopic level. This work has developed an accurate mesoscopic simulation method for calculating chain-type magnetorheological fluids, establishing a connection between mesoscopic structures and macroscopic properties, and unveiling the tremendous potential for accelerating the design of next-generation magnetic fluids using this approach.

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Section: Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Nanosphere Chain Model of Magnetic Fluid and Its Dynamic Performance

Wang,

Liu,

Lian

et al. 2024

Langmuir

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“…Microfluidics is the study of fluid manipulation through a small-scale channel (microchannel) involving various fields of science such as engineering, biology, and chemistry. The research interest in microfluidics has been increasing over the past 10 years [1][2][3][4][5][6][7][8] in order to develop and create many microscale tools; for example, organs-on-a-chip [9,10], labs-on-a-chips [11], 3D printing [12,13], and RNA-delivery devices [14]. Some primary advantages of these technologies [15] are: (i) reducing the consumption of sample and reagent quantities, (ii) saving cost and time in operation and manufacturing products, and (iii) performing detection and separation of molecules at high resolution and sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Combined Pressure-Driven and Electroosmotic Slip Flow through Elliptic Cylindrical Microchannels: The Effect of the Eccentricity of the Channel Cross-Section

Chuchard

Numpanviwat

2022

Symmetry

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Electroosmotic force has been used extensively to manipulate fluid flow in a microfluidic system with various channel shapes, especially an elliptic cylinder. However, developing a computational domain and simulating fluid flow for a system involving an elliptic channel consumes a large amount of time. Moreover, the mathematical expression for the fluid velocity of electroosmotic flow in an elliptic channel may be given in the form of the Mathieu functions that have difficulty in achieving the numerical result. In addition, there is clear scientific evidence that confirms the slippage of fluid at the solid-fluid interface in a microscale system. In this study, we present the mathematical model of combined pressure-driven and electroosmotic flow through elliptic microchannels under the slip-fluid condition. From the practical point of view in fluidics, the effect of the eccentricity of the channel cross-section is investigated on the volumetric flow rate to overcome the difficulty. The results show that the substitution of the equivalent circular channel for an elliptic channel provides a valid flow rate under the situation that the areas of both channel cross-sections are equal and the eccentricity of the elliptic cross-section is less than 0.5. Additionally, the flow rate obtained from the substitution is more accurate when the slip length increases or the pressure-gradient-to-external-electric-field ratio decreases.

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Preparation and characterization of magnetic molecular imprinted polymers with ionic liquid for the extraction of carbaryl in food

Chen

et al. 2019

Anal Bioanal Chem

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Microfluidic magnetic switching valves based on aggregates of magnetic nanoparticles: Effects of aggregate length and nanoparticle sizes

Cited by 8 publications

References 16 publications

Nanosphere Chain Model of Magnetic Fluid and Its Dynamic Performance

Nanosphere Chain Model of Magnetic Fluid and Its Dynamic Performance

Combined Pressure-Driven and Electroosmotic Slip Flow through Elliptic Cylindrical Microchannels: The Effect of the Eccentricity of the Channel Cross-Section

Preparation and characterization of magnetic molecular imprinted polymers with ionic liquid for the extraction of carbaryl in food

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