The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Y Maeda - One of the best experts on this subject based on the ideXlab platform.
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thermal molecular focusing tunable cross effect of Phoresis and light driven hydrodynamic focusing
Soft Matter, 2018Co-Authors: Tatsuya Fukuyama, Sho Nakama, Y MaedaAbstract:The control of solute flux by either microscopic Phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solutes such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We develop a model where the viscoelastic expansion of a solution and the viscosity gradient of a smaller solute are coupled, which explains the underlying hydrodynamic focusing. This effect offers novel non-invasive manipulation of soft and biological materials in a frequency-tunable manner.
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thermal molecular focusing tunable cross effect of Phoresis and advection
arXiv: Soft Condensed Matter, 2017Co-Authors: Tatsuya Fukuyama, Sho Nakama, Y MaedaAbstract:The control of solute fluxes through either microscopic Phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solute such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a single heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We developed a theoretical model, where heat conduction, viscoelastic expansion of walls, and the viscosity gradient of a smaller solute are coupled, and that can explain the underlying hydrodynamic focusing and its interplay with phoretic transports. This cross effect may allow one to design a unique miniaturized pump in microfluidics.
Tatsuya Fukuyama - One of the best experts on this subject based on the ideXlab platform.
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thermal molecular focusing tunable cross effect of Phoresis and light driven hydrodynamic focusing
Soft Matter, 2018Co-Authors: Tatsuya Fukuyama, Sho Nakama, Y MaedaAbstract:The control of solute flux by either microscopic Phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solutes such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We develop a model where the viscoelastic expansion of a solution and the viscosity gradient of a smaller solute are coupled, which explains the underlying hydrodynamic focusing. This effect offers novel non-invasive manipulation of soft and biological materials in a frequency-tunable manner.
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thermal molecular focusing tunable cross effect of Phoresis and advection
arXiv: Soft Condensed Matter, 2017Co-Authors: Tatsuya Fukuyama, Sho Nakama, Y MaedaAbstract:The control of solute fluxes through either microscopic Phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solute such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a single heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We developed a theoretical model, where heat conduction, viscoelastic expansion of walls, and the viscosity gradient of a smaller solute are coupled, and that can explain the underlying hydrodynamic focusing and its interplay with phoretic transports. This cross effect may allow one to design a unique miniaturized pump in microfluidics.
Ehud Yariv - One of the best experts on this subject based on the ideXlab platform.
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boundary effects on electro magneto Phoresis
Journal of Fluid Mechanics, 2009Co-Authors: Ehud Yariv, T MilohAbstract:The effect of a remote insulating boundary on the electro-magneto-phoretic motion of an insulating spherical particle suspended in a conducting liquid is investigated using an iterative reflection scheme developed about the unbounded-fluid-domain solution of Leenov & Kolin (J. Chem. Phys., vol. 22, no. 4, p. 683). Wall-induced corrections result from velocity reflections, successively introduced so as to maintain the no-slip condition on the wall and particle boundaries, as well as from the Lorentz forces associated with comparable reflections of the electric field. This method generates asymptotic expansions in λ («1), the ratio of particle size to particle-wall separation. The leading-order correction to the hydrodynamic force on the particle appears at O(λ 3 ); it is directed along the leading-order force and tends to augment it.
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slender body approximations for electro Phoresis and electro rotation of polarizable particles
Journal of Fluid Mechanics, 2008Co-Authors: Ehud YarivAbstract:Slender-body asymptotic theory is used to evaluate the translational and rotational electrophoretic velocities of initially uncharged polarizable bodies of revolution. These velocities are obtained as asymptotic expansions in the small particle slenderness. Conducting particles which lack fore-aft symmetry translate parallel to the applied field direction, regardless of their orientation relative to it. Both conducting and dielectric particles tend to align with the field. The translational and rotational velocities of dielectric particles are asymptotically smaller than those of comparable conducting particles.
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electro magneto Phoresis of slender bodies
Journal of Fluid Mechanics, 2007Co-Authors: Ehud Yariv, T MilohAbstract:It is well known that the rigid-body motion of a freely suspended particleembedded in a conducting Newtonian fluid can be remotely controlled by externallyapplied electric and magnetic fields through an electro-magneto-phoretic mechanism.This ability to manipulate the six-velocity motion of a body provides an efficientmethod for various engineering applications such as impurity extraction, speciesseparation, mixing and stirring, and particle manipulation and control. A review ofelectro-magneto-phoretic bio-engineering applications was recently given by Watarai,Suwa & Iiguni (2004).The electro-magneto-phoretic mechanism, which is due to a rotational Lorentzbody force, was firstly introduced by Kolin (1953). An analysis for spherical particleswas carried out by Leenov & Kolin (1954), and a comparable analysis for ellipsoidalparticles was performed by Sellier (2003a). A general analysis for arbitrary bodyshapes was presented by Moffatt & Sellier (2002) using symmetry arguments.Exploiting the bilinear dependence of the Lorentz force-density term upon theelectric and magnetic fields, together with the linearity of the Stokes equations,Moffatt & Sellier derived general mobility-type relations for isotropic, axisymmetricand orthotropic particle shapes.While the analysis of Moffatt & Sellier (2002) provides the tensorial structurefor the hydrodynamic forces which act upon non-isotropic particles, it does notgive the respective numerical coefficients. In a follow-up paper (Sellier 2003b), ageneral boundary-integral formulation scheme is presented. This scheme enables thecalculation of these forces without the need to directly solve the electrostatic and flowproblems. This formulation, which only requires prescribing the value of the potentialand its derivatives on the particle surface, is natural for use in numerical analyses. Italso renders analytic expressions for ellipsoidal particles.The symmetry analysis of Moffatt & Sellier (2002) demonstrated that thecombination of electric and magnetic fields can result in a rich topology of particlemotion, unparalleled by other (e.g. phoretic) animation mechanisms. Since highlysymmetric particle shapes do not exhibit that richness, it is desirable to analyse moregeneral shapes, even in an approximate manner: such approximations can be usedfor understanding the dynamics and control of non-isotropic particles. Unfortunately,
T Miloh - One of the best experts on this subject based on the ideXlab platform.
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boundary effects on electro magneto Phoresis
Journal of Fluid Mechanics, 2009Co-Authors: Ehud Yariv, T MilohAbstract:The effect of a remote insulating boundary on the electro-magneto-phoretic motion of an insulating spherical particle suspended in a conducting liquid is investigated using an iterative reflection scheme developed about the unbounded-fluid-domain solution of Leenov & Kolin (J. Chem. Phys., vol. 22, no. 4, p. 683). Wall-induced corrections result from velocity reflections, successively introduced so as to maintain the no-slip condition on the wall and particle boundaries, as well as from the Lorentz forces associated with comparable reflections of the electric field. This method generates asymptotic expansions in λ («1), the ratio of particle size to particle-wall separation. The leading-order correction to the hydrodynamic force on the particle appears at O(λ 3 ); it is directed along the leading-order force and tends to augment it.
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electro magneto Phoresis of slender bodies
Journal of Fluid Mechanics, 2007Co-Authors: Ehud Yariv, T MilohAbstract:It is well known that the rigid-body motion of a freely suspended particleembedded in a conducting Newtonian fluid can be remotely controlled by externallyapplied electric and magnetic fields through an electro-magneto-phoretic mechanism.This ability to manipulate the six-velocity motion of a body provides an efficientmethod for various engineering applications such as impurity extraction, speciesseparation, mixing and stirring, and particle manipulation and control. A review ofelectro-magneto-phoretic bio-engineering applications was recently given by Watarai,Suwa & Iiguni (2004).The electro-magneto-phoretic mechanism, which is due to a rotational Lorentzbody force, was firstly introduced by Kolin (1953). An analysis for spherical particleswas carried out by Leenov & Kolin (1954), and a comparable analysis for ellipsoidalparticles was performed by Sellier (2003a). A general analysis for arbitrary bodyshapes was presented by Moffatt & Sellier (2002) using symmetry arguments.Exploiting the bilinear dependence of the Lorentz force-density term upon theelectric and magnetic fields, together with the linearity of the Stokes equations,Moffatt & Sellier derived general mobility-type relations for isotropic, axisymmetricand orthotropic particle shapes.While the analysis of Moffatt & Sellier (2002) provides the tensorial structurefor the hydrodynamic forces which act upon non-isotropic particles, it does notgive the respective numerical coefficients. In a follow-up paper (Sellier 2003b), ageneral boundary-integral formulation scheme is presented. This scheme enables thecalculation of these forces without the need to directly solve the electrostatic and flowproblems. This formulation, which only requires prescribing the value of the potentialand its derivatives on the particle surface, is natural for use in numerical analyses. Italso renders analytic expressions for ellipsoidal particles.The symmetry analysis of Moffatt & Sellier (2002) demonstrated that thecombination of electric and magnetic fields can result in a rich topology of particlemotion, unparalleled by other (e.g. phoretic) animation mechanisms. Since highlysymmetric particle shapes do not exhibit that richness, it is desirable to analyse moregeneral shapes, even in an approximate manner: such approximations can be usedfor understanding the dynamics and control of non-isotropic particles. Unfortunately,
Sho Nakama - One of the best experts on this subject based on the ideXlab platform.
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thermal molecular focusing tunable cross effect of Phoresis and light driven hydrodynamic focusing
Soft Matter, 2018Co-Authors: Tatsuya Fukuyama, Sho Nakama, Y MaedaAbstract:The control of solute flux by either microscopic Phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solutes such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We develop a model where the viscoelastic expansion of a solution and the viscosity gradient of a smaller solute are coupled, which explains the underlying hydrodynamic focusing. This effect offers novel non-invasive manipulation of soft and biological materials in a frequency-tunable manner.
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thermal molecular focusing tunable cross effect of Phoresis and advection
arXiv: Soft Condensed Matter, 2017Co-Authors: Tatsuya Fukuyama, Sho Nakama, Y MaedaAbstract:The control of solute fluxes through either microscopic Phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solute such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a single heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We developed a theoretical model, where heat conduction, viscoelastic expansion of walls, and the viscosity gradient of a smaller solute are coupled, and that can explain the underlying hydrodynamic focusing and its interplay with phoretic transports. This cross effect may allow one to design a unique miniaturized pump in microfluidics.