Translational thermophoresis and rotational movement of peanut-like colloids under temperature gradient

Dong, Ruo-Yu; Zhou, Yi; Yang, Chun; Cao, Bing‐Yang

doi:10.1007/s10404-015-1605-1

Cited by 20 publications

(23 citation statements)

References 29 publications

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“…Alternatively, heating and cooling channels can be used with a counter flow (cf. Figure 1 c), so that the temperature gradient remains constant along the measurement channel, but a change of the average temperature in z -direction cannot usually be avoided [ 43 , 45 , 59 ]. An example of a channel geometry will be given in Section 5.2.1 .…”

Section: How To Generate Temperature Gradientsmentioning

confidence: 99%

“…If the dimensions and thermophysical properties are known the temperature profile between the cold and hot channel can be estimated. The micron-scale devices using channels do not require clean-room facilities, as it is required for lithographical fabrication on nano-size wires and has been realized in various labs [ 41 , 43 , 45 , 47 , 55 , 56 , 58 , 59 , 61 ].…”

Section: How To Generate Temperature Gradientsmentioning

confidence: 99%

“…In the majority of the devices [ 41 , 43 , 45 , 47 , 55 , 56 , 58 , 59 ], water is directly used as thermostating fluid or as heat sink fluid, if Peltier elements are used [ 61 ]. So far, the operating temperatures are located in the liquid state of water.…”

Section: How To Generate Temperature Gradientsmentioning

confidence: 99%

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Thermophoretic Micron-Scale Devices: Practical Approach and Review

Lee

Wiegand

2020

Entropy

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In recent years, there has been increasing interest in the development of micron-scale devices utilizing thermal gradients to manipulate molecules and colloids, and to measure their thermophoretic properties quantitatively. Various devices have been realized, such as on-chip implements, micro-thermogravitational columns and other micron-scale thermophoretic cells. The advantage of the miniaturized devices lies in the reduced sample volume. Often, a direct observation of particles using various microscopic techniques is possible. On the other hand, the small dimensions lead to some technical problems, such as a precise temperature measurement on small length scale with high spatial resolution. In this review, we will focus on the “state of the art” thermophoretic micron-scale devices, covering various aspects such as generating temperature gradients, temperature measurement, and the analysis of the current micron-scale devices. We want to give researchers an orientation for their development of thermophoretic micron-scale devices for biological, chemical, analytical, and medical applications.

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Section: How To Generate Temperature Gradientsmentioning

confidence: 99%

Section: How To Generate Temperature Gradientsmentioning

confidence: 99%

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Thermophoretic Micron-Scale Devices: Practical Approach and Review

Lee

Wiegand

2020

Entropy

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“…Zhao et al [ 14 ] reported both theoretical and experimental studies of collective effects on the Soret coefficient of particles in deionized (DI) water. Translational thermophoresis and rotational movement of peanut-like colloids under the influence of temperature gradient is addressed by Dong et al [ 15 ]. Wang et al [ 16 ] discussed the thermal diffusion behavior of dilute solutions of very long and thin charged colloidal rods by using the holographic grating technique.…”

Section: Introductionmentioning

confidence: 99%

Influence of Magnetic Field in Three-Dimensional Flow of Couple Stress Nanofluid over a Nonlinearly Stretching Surface with Convective Condition

et al. 2015

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This article investigates the magnetohydrodynamic (MHD) three-dimensional flow of couple stress nanofluid subject to the convective boundary condition. Flow is generated due to a nonlinear stretching of the surface in two lateral directions. Temperature and nanoparticles concentration distributions are studied through the Brownian motion and thermophoresis effects. Couple stress fluid is considered electrically conducting through a non-uniform applied magnetic field. Mathematical formulation is developed via boundary layer approach. Nonlinear ordinary differential systems are constructed by employing suitable transformations. The resulting systems have been solved for the convergent series solutions of velocities, temperature and nanoparticles concentration profiles. Graphs are sketched to see the effects of different interesting flow parameters on the temperature and nanoparticles concentration distributions. Numerical values are computed to analyze the values of skin-friction coefficients and Nusselt number.

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“…24,25 Recently, manipulation of microparticles by temperature gradient field has attracted tremendous attention for the simplicity of its manipulating mechanism. Temperature gradient in particle suspensions can cause thermal buoyancy convection, 26 particle thermophoresis, 27 and thermo-capillary convection. 28 For buoyancy convection, it can generate threedimensional internal flow and form microvortices; the microparticles in granular fluid will migrate under the drag force of vortices.…”

mentioning

confidence: 99%

Efficient Micro/Nanoparticle Concentration using Direct Current-Induced Thermal Buoyancy Convection for Multiple Liquid Media

et al. 2019

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Thermal-based microparticle focusing has recently received increasing attention due to its noninvasive nature and simple manipulation mechanism. However, its further application is limited by current complicated fluid heating systems and low particle focusing velocity. Using simple indium tin oxide-made microheaters, herein we propose a flexible and novel approach for efficient particle focusing based on direct current-induced thermal buoyancy convection. Importantly, for avoiding possible electrochemical reactions on the electrode, the microheaters are isolated from the granular fluids of interest by a thin glass slide. The concentration performance of the designed chip was first demonstrated by statically focusing 4-μm silica particles, yeast cells, silica particles in insulating buffer, and 100-nm copper microspheres. Also the trapping of a mixture of 5-μm and 2-μm polystyrene microbeads indicated that the chip can either simultaneously concentrate two kinds of particles or selectively focus the heavier ones by adjusting the voltages. Then the different concentration patterns of microbeads exhibited that the microspheres can be flexibly manipulated by changing the configurations of microheaters. Furthermore, for the first time, we achieved thermal-based continuous particle focusing in both conducting and insulating solutions using buoyancy convection, demonstrating that this method can be utilized to achieve both static and continuous particle manipulations in multiple liquid media. Finally, the feasibility of this device in effective wear measurement of machines was demonstrated by conducting systematic experiments of focusing nanocopper particles in the hydraulic oil. Therefore, this presented approach would be promising for a broad range of on-chip applications.

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Translational thermophoresis and rotational movement of peanut-like colloids under temperature gradient

Cited by 20 publications

References 29 publications

Thermophoretic Micron-Scale Devices: Practical Approach and Review

Thermophoretic Micron-Scale Devices: Practical Approach and Review

Influence of Magnetic Field in Three-Dimensional Flow of Couple Stress Nanofluid over a Nonlinearly Stretching Surface with Convective Condition

Efficient Micro/Nanoparticle Concentration using Direct Current-Induced Thermal Buoyancy Convection for Multiple Liquid Media

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