Experimental Evidence of Thermophoresis of Non-Brownian Particles in Pure Liquids and Estimation of Their Thermophoretic Mobility

Regazzetti, Anne; Hoyos, Mauricio; Martin, Michel

doi:10.1021/jp031321a

Cited by 26 publications

(36 citation statements)

References 40 publications

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“…Values of C s for the thermophoretic motion of silica particles in several solvents are found to be of the order of 10 −8 -10 −7 cm 2 s −1 K −1 [23]. Values of similar order of magnitude for various particle-liquid systems have been found in the experimental study of [19]. Thermal creep in liquids has also been proposed to exist in [2], where C s is given by the product of the liquid's coefficient of thermal expansion and its thermometric diffusivity.…”

Section: Problem Formulationsupporting

confidence: 65%

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Thermophoretic Motion of a Slightly Deformed Sphere Through a Viscous Fluid

Mohan¹,

Brenner²

2006

SIAM J. Appl. Math.

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This paper provides a general approach to the solution of the problem of nonisothermal Stokes flow relative to a heat-conducting particle having the shape of a slightly deformed sphere, taking account of Maxwell's [J. C. Maxwell, Philos. Trans. R. Soc. Lond., 170 (1879), pp. 231-256] thermal creep condition at the surface of the particle. The results, which are of interest in connection with the phenomenon of thermophoresis, have potential applications in aerosol technology, and in the nonisothermal transport and processing of particulate matter. For the specific case of thermally nonconducting particles, the results obtained herein accord with Morrison's [F. A. Morrison, J. Colloid Interface Sci., 34 (1970), pp. 210-214] proof in the comparable electrophoretic case that the phoretic velocity of a nonconducting, force-and torque-free, nonspherical particle undergoing electrophoresis in a fluid that is otherwise at rest is independent of the size, shape and orientation of the particle, and is identical to that of a sphere.

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Section: Problem Formulationsupporting

confidence: 65%

“…subject to boundary conditions (19) and (21). Accordingly, the leading-order vector temperature fields are readily found to be Upon applying the gradient operator, given by (4), to (24), and noting that (∂r/∂r) r = I −rr, we obtain…”

Section: Problem Formulationmentioning

confidence: 99%

Thermophoretic Motion of a Slightly Deformed Sphere Through a Viscous Fluid

Mohan¹,

Brenner²

2006

SIAM J. Appl. Math.

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“…for silica particles with a radius R = 3 µm in a number of liquids, including water and n-heptane [56]. The experiments were conducted in a liquid layer with L = 0.1 mm subjected to a temperature difference ∆T = 25 K. This is the reason why Table I gives estimates for the NE pressures with ∆T = 25 K. From the experimental results of Regazzetti et al, we have earlier concluded that for silica particles in water E th = 280 fN and in n-heptane E th = 30 fN [11].…”

Section: Discussionmentioning

confidence: 99%

Nonequilibrium fluctuation-induced Casimir pressures in liquid mixtures

2016

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In this article we derive expressions for Casimir-like pressures induced by nonequilibrium concentration fluctuations in liquid mixtures. The results are then applied to liquid mixtures in which the concentration gradient results from a temperature gradient through the Soret effect. A comparison is made between the pressures induced by nonequilibrium concentration fluctuations in liquid mixtures and those induced by nonequilibrium temperature fluctuations in one-component fluids. Some suggestions for experimental verification procedures are also presented.

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“…[13][14][15]. Thermophoresis has been investigated to manipulate biomolecules [16][17][18][19][20][21][22] and cells [23], as well as colloids for more fundamental investigations [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. It can also be applied to the concentration of DNA [41] or the measurement of protein binding [42,43].…”

Section: Introductionmentioning

confidence: 99%

Thermophoretic Manipulation of Micro- and Nanoparticle Flow through a Sudden Contraction in a Microchannel with Near-Infrared Laser Irradiation

Tsuji

Sasai

2018

Phys. Rev. Applied

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A temperature gradient in a continuous fluid induces the motion of dispersed micro-and nanoparticles even when the fluid is motionless. This phenomenon is known as thermophoresis, and it is expected to be the basis for techniques to control particle motion. In this study, we use the thermophoresis of microand nanoparticles in a microchannel filled with an aqueous solution to control the particle motion near the inlet of a sudden contraction, which is a narrower channel connecting two wider channels. Microfluidic devices with sudden contractions are widely used to develop various devices with micro-and nanometer dimensions, such as nanopore sensors. A near-infrared laser is used to create a strong temperature gradient of O(10 6) K m −1 and induce thermophoresis of micro-and nanoparticles. Because the heating by the laser irradiation is localized near the inlet of the contraction, this configuration is useful for controlling particle translocation into and through the contraction. We characterize our experimental setup by quantifying flow and temperature fields near the contraction channel using particle image velocimetry and laser-induced fluorescence, respectively. Then, we observe the obstruction of the particle translocation into the contraction channel induced by the laser-induced thermophoresis for various parameters such as channel dimensions, flow speeds, particle sizes, and laser powers. Near the inlet of the contraction channel, the counterbalance of thermophoretic force and flow drag leads to the ringlike pattern formation of the particle distribution. Moreover, we carry out some demonstrations using the proposed system to selectively translocate particles and enhance the sensing performance due to increased particle density. Thanks to the noncontact nature of laser-induced thermophoresis, the integration of our method into existing microfluidic devices is feasible and expected to improve technologies for manipulating particles in fluids.

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Experimental Evidence of Thermophoresis of Non-Brownian Particles in Pure Liquids and Estimation of Their Thermophoretic Mobility

Cited by 26 publications

References 40 publications

Thermophoretic Motion of a Slightly Deformed Sphere Through a Viscous Fluid

Thermophoretic Motion of a Slightly Deformed Sphere Through a Viscous Fluid

Nonequilibrium fluctuation-induced Casimir pressures in liquid mixtures

Thermophoretic Manipulation of Micro- and Nanoparticle Flow through a Sudden Contraction in a Microchannel with Near-Infrared Laser Irradiation

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