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arXiv · 1004.4740

Localized Joule heating produced by ion current focusing through micron-size holes

V. Viasnoff·U. Bockelmann·A. Meller·H. Isambert·L. Laufer·Y. Tsori
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Abstract

We provide an experimental demonstration that the focusing of ionic currents in a micron size hole connecting two chambers can produce local temperature increases of up to $100^\circ$ C with gradients as large as $1^\circ$ K$μm^{-1}$. We find a good agreement between the measured temperature profiles and a finite elements-based numerical calculation. We show how the thermal gradients can be used to measure the full melting profile of DNA duplexes within a region of 40 $μ$m. The possibility to produce even larger gradients using sub-micron pores is discussed.

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V. Viasnoff, U. Bockelmann, A. Meller, H. Isambert, L. Laufer, Y. Tsori. 2010-04-27. Localized Joule heating produced by ion current focusing through micron-size holes. https://doi.org/10.1063/1.3399315

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