Experiments on breakups of a magnetic fluid drop through a micro-orifice

Chen, Ching‐Yao; Chen, C.-H.; Lee, W.-F.

doi:10.1016/j.jmmm.2009.06.066

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…Nanoparticles at the fluid interface reduce the interfacial tension leading to the formation of smaller droplets as compared to those of the pure carrier fluid under the same condition (Murshed et al 2009). Chen et al (2009) only used the magnetic body force to form ferrofluid droplets through an orifice. Tan et al (2010) combined pressure-driven flow with the magnetic force to control the droplet formation process at a microfludic T-junction.…”

Section: Ferrohydrodynamicsmentioning

confidence: 99%

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Nguyen

2011

Microfluid Nanofluid

336

169

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Micro-magnetofluidics refers to the science and technology that combines magnetism with microfluidics to gain new functionalities. Magnetism has been used for actuation, manipulation and detection in microfluidics. In turn, microfluidic phenomena can be used for making tunable magnetic devices. This paper presents a systematic review on the interactions between magnetism and fluid flow on the microscale. The review rather focuses on physical and engineering aspects of micro-magnetofluidics, than on the biological applications which have been addressed in a number of previous excellent reviews. The field of micromagnetofluidics can be categorized according to the type of the working fluids and the associated microscale phenomena of established research fields such as magnetohydrodynamics, ferrohydrodynamics, magnetorheology and magnetophoresis. Furthermore, similar to microfluidics the field can also be categorized as continuous and digital micro-magnetofluidics. Starting with the analysis of possible magnetic forces in microscale and the impact of miniaturization on these forces, the paper revisits the use of magnetism for controlling fluidic functions such as pumping, mixing, magnetowetting as well as magnetic manipulation of particles. Based on the observations made with the state of the art of the field micro-magnetofluidics, the paper presents some perspectives on the possible future development of this field. While the use of magnetism in microfluidics is relatively established, possible new phenomena and applications can be explored by utilizing flow of magnetic and electrically conducting fluids.

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Section: Ferrohydrodynamicsmentioning

confidence: 99%

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Nguyen

2011

Microfluid Nanofluid

336

169

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“…Ferrofluid microdroplets can be generated in microfluidic architectures using conventional methods 65,66. These droplets can be maneuvered precisely with external magnetic fields on flat microfluidic substrates and surfaces42,43 or while immersed in an immiscible fluid 41.…”

Section: Ferrofluids and Their Mems And Biomems Applicationsmentioning

confidence: 99%

Microfluidic transport in magnetic MEMS and bioMEMS

Ganguly

Puri

2010

WIREs Nanomed Nanobiotechnol

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Magnetic materials, such as ferrimagnetic and ferromagnetic nanoparticles and microparticles in the form of ferrofluids, can be advantageously used in micro-electro-mechanical systems (MEMS) and bioMEMS applications, as they possess several unique features that provide solutions for major microfluidic challenges. These materials come with a wide range of sizes, tunable magnetic properties and offer a stark magnetic contrast with respect to biological entities. Thus, these magnetic particles are readily and precisely maneuvered in microfluidic and biological environments. The surfaces of these particles offer a relatively large area that can be functionalized with diverse biochemical agents. The useful combination of selective biochemical functionalization and 'action-at-a-distance' that a magnetic field provides makes superparamagnetic particles useful for the application in micro-total analysis systems (micro-TAS). We provide insight into the microfluidic transport of magnetic particles and discuss various MEMS and bioMEMS applications.

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“…Multiple works studied the breakup of drops under electric (Sherwood 1988;Basaran et al 1995;Lac & Homsy 2007;Deshmukh & Thaokar 2012;Paknemat, Pishevar & Pournaderi 2012;Karyappa, Naik & Thaokar 2015) or magnetic (Potts, Barrett & Diver 2001;Afkhami et al 2008) fields, as well as the breakup of jets under electric fields (Collins, Harris & Basaran 2007). Drop formation facilitated by electric (Notz & Basaran 1999) and magnetic (Chen, Chen & Lee 2009) fields, and dynamics and instabilities of pendent drops under an electric field (Acero et al 2013;Ferrera et al 2013;Corson et al 2014) were also explored. Other works addressed simultaneous motion and deformation of free drops under magnetic fields (Nguyen, Ng & Huang 2006;Shi, Bi & Zhou 2014), electrified drops in a microfluidic channel (Wehking & Kumar 2015), and drops on a solid surface by electric (Datta, Das & Das 2015) and rotating magnetic (Zakinyan, Nechaeva & Dikansky 2012) fields.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of ferrofluid drop deformations under spatially uniform magnetic fields

2016

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We systematically study the shape and dynamics of a Newtonian ferrofluid drop immersed in an immiscible, Newtonian and non-magnetic viscous fluid under the action of a uniform external magnetic field. We obtain the exact equilibrium drop shapes for arbitrary ferrofluids, characterize the extent of deviations of the exact shape from the commonly assumed ellipsoidal shape, and analyse the smoothness of highly curved tips in elongated drops. We also present a comprehensive study of drop deformation for a Langevin ferrofluid. Using a computational scheme that allows fast and accurate simulations of ferrofluid drop dynamics, we show that the dynamics of drop deformation by an applied magnetic field is described up to a numerical factor by the same time scale as drop relaxation in the absence of any magnetic field. The numerical factor depends on the ratio of viscosities and the ratio of magnetic to capillary stresses, but is independent of the nature of the ferrofluid in most practical cases.

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Experiments on breakups of a magnetic fluid drop through a micro-orifice

Cited by 13 publications

References 27 publications

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Micro-magnetofluidics: interactions between magnetism and fluid flow on the microscale

Microfluidic transport in magnetic MEMS and bioMEMS

Dynamics of ferrofluid drop deformations under spatially uniform magnetic fields

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