Drift–diffusion kinetics of a confined colloid

Leroyer, Yves; Würger, Aloïs

doi:10.1088/0953-8984/22/19/195104

Cited by 3 publications

(2 citation statements)

References 28 publications

(60 reference statements)

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“…The steady-state distribution is readily obtained from the condition of zero current; there is no closed solution for the transient kinetics. The time dependent distribution function n(x, t) has been given as series in powers of e −L/ℓ ; a rather simple expression arises for the case of strong confinement L ≫ ℓ [153].…”

Section: B Lateral Fields In a Microchannelmentioning

confidence: 99%

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Thermal non-equilibrium transport in colloids

Würger¹

2010

Rep. Prog. Phys.

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373

537

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A temperature gradient acts like an external field on colloidal suspensions and drives the solute particles to the cold or to the warm, depending on interfacial and solvent properties. We discuss different transport mechanisms for charged colloids, and how a thermal gradient gives rise to companion fields. Particular emphasis is put on the thermal response of the electrolyte solution: Positive and negative ions diffuse along the temperature gradient and thus induce a thermoelectric field which in turn acts on the colloidal charges. Regarding polymers in organic solvents, the physical mechanism changes with decreasing molecular weight: High polymers are described in the framework of macroscopic hydrodynamics, for short chains and molecular mixtures of similar size, the Brownian motion of solute and solvent becomes important.

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Section: B Lateral Fields In a Microchannelmentioning

confidence: 99%

“…The time dependent distribution function n(x, t) has been given as series in powers of e −L/ ; a rather simple expression arises for the case of strong confinement L [153].…”

Section: Lateral Fields In a Microchannelmentioning

confidence: 99%

Thermal non-equilibrium transport in colloids

Würger¹

2010

Rep. Prog. Phys.

Self Cite

373

537

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Phototaxis of the dominant marine pico-eukaryoteMicromonas sp.: from population to single cell

Henshaw

Jeanneret

Polin

2019

Preprint

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Micromonas commoda (previously Micromonas pusilla, a unicellular photosynthetic picoeukaryote globally dominant in marine ecosystems, has previously been qualified as being strongly phototactic. To date, no detailed quantitative or qualitative description of this behaviour has been reported, nor have thorough studies of its motility been undertaken. This primary producer has only been qualitatively described as utilizing run-and-tumble motion, but such motility strategy is incompatible with its morphology comprising only one propelling flagellum. Moreover, it is still unclear as to how Micromonas sp. detects a light direction due to the lack of a dedicated eyespot; the organism is essentially blind. Here we first perform population-scale phototactic experiments to show that this organism actively responds to a wide range of light wavelengths and intensities. These population responses are well accounted for within a simple drift-diffusion framework. Based on single-cell tracking experiments, we then detail thoroughly Micromonas sp.'s motility which resembles run-and-reverse styles of motion commonly observed in marine prokaryotes and that we name stop-run or reverse. The associated peculiar microscopic changes upon photo-stimulation are finally described and integrating those into jump-diffusion simulations appears to produce phototactic drifts that are quantitatively compatible with those obtained experimentally at the population level.

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Exact solution of a boundary tumbling particle system in one dimension

Roberts

Pruessner

2022

Phys. Rev. Research

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Drift–diffusion kinetics of a confined colloid

Cited by 3 publications

References 28 publications

Thermal non-equilibrium transport in colloids

Thermal non-equilibrium transport in colloids

Phototaxis of the dominant marine pico-eukaryoteMicromonas sp.: from population to single cell

Exact solution of a boundary tumbling particle system in one dimension

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