LY, Aboubakry; WÜRGER, Aloïs

doi:10.1039/c7sm01317e

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LY, Aboubakry
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

WÜRGER, Aloïs
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Soft Matter. 2018-02-07, vol. 14, n° 5, p. 848-852

Royal Society of Chemistry

Resumen en inglés

We theoretically study the molecular-weight dependence of DNA thermophoresis, which arises from mutual advection of the n repeat units of the molecular chain. As a main result we find that the dominant driving forces, i.e., the thermally induced permittivity gradient and the electrolyte Seebeck effect, result in characteristic hydrodynamic screening. In comparison with recent experimental data on single-stranded DNA (2 ≤ n ≤ 80), our theory quantitatively describes the increase of the drift velocity up to n = 30; the slowing-down of longer molecules is well accounted for by a simple model for counterion condensation. It turns out that thermophoresis may change sign as a function of n: For an appropriate choice of the salt-specific Seebeck coefficient, short molecules move to the cold and long ones to the hot; this could be used for separating DNA by molecular weight.< Leer menos

DOI

http://dx.doi.org/10.1039/c7sm01317e

Proyecto ANR

Effets thermoélectriques à l'échelle nano - ANR-13-IS04-0003

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Importado de Hal

Centros de investigación

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798