Micro-thermal field-flow fractionation: new high-performance method for particle size distribution analysis

Janča, Josef; Berneron, Jean François; Boutin, René

doi:10.1016/s0021-9797(02)00216-3

Cited by 36 publications

(35 citation statements)

References 17 publications

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“…For example in biological cell, coupling of two gradients is often used to promote molecular transport against one of the gradients as in chemiosmosis [2]. In physics and chemistry, novel methods to utilize phoretic properties (electro-, thermo-, and diffusiophoresis) are proposed for transporting and screening particles in labon-chip [3,4] or designing active materials [5]. In thermophoresis, the speed and direction of migration along a temperature gradient are characterized by Soret coefficient, which is generally material-dependent [6,7,8,9,10].…”

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confidence: 99%

Manipulation of Colloids by a Nonequilibrium Depletion Force in a Temperature Gradient

et al. 2009

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The non-equilibrium distribution of colloids in a polymer solution under a temperature gradient is studied experimentally. A slight increase of local temperature by a focused laser drives the colloids towards the hot region, resulting in the trapping of the colloids irrespective of their own thermophoretic properties. An amplification of the trapped colloid density with the polymer concentration is measured, and is quantitatively explained by hydrodynamic theory. The origin of the attraction is a migration of colloids driven by a non-uniform polymer distribution sustained by the polymer's thermophoresis. These results show how to control thermophoretic properties of colloids.

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confidence: 99%

Manipulation of Colloids by a Nonequilibrium Depletion Force in a Temperature Gradient

et al. 2009

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“…8 Further, some attempts have been carried out to develop a new particle-size measurement method; a unique method by using the thermal field-flow fractionation was theoretically proposed together with some simulation measurements. 9 A diffuse reflectance technique in the infrared region was reported to be applicable to the particle size determination. 10 Further, nearinfrared spectroscopy has recently been applied to the particlesize determination by using a simultaneously chemoinfometric calibration method, and showed its usefulness.…”

Section: 2mentioning

confidence: 99%

“…(9). If the f dependences are different at every particle size, the particle sizes and the sample amounts are expected to be determined based on the f dependences.…”

Section: Theoretical Treatmentsmentioning

confidence: 99%

“…P(r, x, f)L, which is proportional to the ATR-spectral intensity, was calculated as a function of f on the basis of Eq. (9) in the range of 20 to 80 degrees at 10 degrees intervals for the parameters of r of 0.07 to 100 mm by using Mathematica 5.2. One of the parameters for the calculations, the wavenumber of the infrared light, k, of Eq.…”

Section: Incidence-angle Dependence Of the Atr Spectral Intensitymentioning

confidence: 99%

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Determination of Particle Size by Using Incidence-Angle Dependence of Spectral Intensity for Particle-Size-Measurement Method by Applying Infrared Attenuated-Total-Reflection Technique and Its Simulations by Using Algebraic-Simultaneous Equations

et al. 2008

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A method using an incidence-angle dependence of the spectral intensity was proposed to determine a particle size in a particle-size measurement by applying an infrared attenuated-total-reflection (ATR) technique. A formula, which is proportional to the infrared ATR-spectral intensity, was constructed as a function of the particle size, amount of particles, and incidence angle, f. Its f dependences were calculated for SiO2 particles of less than a mono layer on a Ge prism, and differed at every particle size. Some simulations of determining both particle size and particle amount were carried out for the samples of particles with sizes of 1 to 3 kinds by using algebraic-simultaneous equations with the software of Mathematica 5.2, and resulted in showing its usefulness.

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“…7 Further, some attempts have been made to develop a new particle-size measurement method, a unique method that uses thermal fieldflow fractionation was theoretically proposed together with some simulation measurements. 8 Upon the application of these methods stated above to a plural-kind-particles sample, components-separation procedures are necessary to determine the particle size of each component. As stated above, the use of infrared light does not require any components-separation procedure to determine the particle sizes of each component.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Treatment of Particle-Size Measurements by Applying Attenuated-Total-Reflection Technique and Its Comparisons with Experimental Results

2008

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Theoretical equations for a particle size-determination method by applying an attenuated-total-reflection (ATR) technique were obtained. Based on these equations, the ATR-spectral intensities were calculated as functions of the sample amount and on the particle size for various choices of the experimental parameters. A mono layer region was more adequate for size measurements than a multiple-layers region. A prism and the incidence angle should be adequately selected according to the aims of the measurements. Experimental results of the sample amount dependences of the spectral intensities were almost consistent with calculations. The experimental results of size dependences showed the same tendency as those by calculations for SiO2 and SiC; especially for SiC, they were in just accord with those by calculations in the case of a KBr prism. Each component of a mixed plural-kind-particles sample almost agreed in its spectral intensity with that of a corresponding single-kind-particles sample. The particle size-determination method, based on the ATR technique, was theoretically supported, and its characteristics were reveled.

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Micro-thermal field-flow fractionation: new high-performance method for particle size distribution analysis

Cited by 36 publications

References 17 publications

Manipulation of Colloids by a Nonequilibrium Depletion Force in a Temperature Gradient

Manipulation of Colloids by a Nonequilibrium Depletion Force in a Temperature Gradient

Determination of Particle Size by Using Incidence-Angle Dependence of Spectral Intensity for Particle-Size-Measurement Method by Applying Infrared Attenuated-Total-Reflection Technique and Its Simulations by Using Algebraic-Simultaneous Equations

Theoretical Treatment of Particle-Size Measurements by Applying Attenuated-Total-Reflection Technique and Its Comparisons with Experimental Results

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