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Nanoscale Seebeck effect at hot nanostructures

Abstract : The aim of this work is to study the nanoscale Seebeck effect at hot nanostructures. At first, we study the thermo-electrophoresis self-propulsion mechanism for a heated metal capped Janus colloid. The self-propulsion mechanism is mainly induced by the electrolyte Seebeck effect or thermoelectric effect. This effect takes its origin from the separation of charges occurring while a temperature gradient is present in a electrolyte solution: A strong absorption of laser light by the metal side of the particle creates a temperature gradient which in turn acts on ion-species (positive and negative) and drives them to the hot or the cold region. This motion of ion results in a dipolar electric field which, close to the particle, depends strongly on the surface properties. The change of behavior of the electric field at the insulating or conducting surface does not affect the velocity of the particle. At second, we study the effect of hydrodynamic interactions and counterion condensation in thermophoresis for DNA polymer. As the main result, the thermophoretic mobility shows, in function of the chain length, a non-monotonuous behavior and consists of two contributions induced by the dominant driving forces which are the thermally induced permittivity-gradient and the electrolyte Seebeck effect. At the end, we compare our theoretical result with recent experiment on single-stranded DNA.
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https://tel.archives-ouvertes.fr/tel-01841492
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Submitted on : Tuesday, July 17, 2018 - 12:55:12 PM
Last modification on : Wednesday, July 18, 2018 - 1:07:32 AM
Long-term archiving on: : Thursday, October 18, 2018 - 2:18:29 PM

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  • HAL Id : tel-01841492, version 1

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Aboubakry Ly. Nanoscale Seebeck effect at hot nanostructures. Micro and nanotechnologies/Microelectronics. Université de Bordeaux, 2018. English. ⟨NNT : 2018BORD0010⟩. ⟨tel-01841492⟩

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