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Nonlinear ionic transport at the nanometric and Ångströmetric scales

Abstract : Nanofluidics research is motivated both by intrinsic interest in the novel transport phenomena observable only at the (sub-)nanometric scale, and by applications including energy generation, desalination, macromolecular analysis, and microscopy. Two key considerations in the development of such technologies are 1) the control of nonlinear ionic transport and 2) the characterization of electrostatic, frictional, and other interactions of solid-liquid interfaces with bulk electrolyte solutions. In this manuscript, I develop a coherent theory of ion-selectivity and nonlinear ionic transport in nanopores & 1 nm in diameter, rationalizing previous experimental work and offering new routes in the development of desalination, energy generation, and other exotic functionalities. I then explore each of the above considerations separately. First, I explore the limits of continuum theory in rationalizing nonlinear coupled transport observed experimentally in ångströmetric channels, revealing the irrelevance of the Navier-Stokes description of the fluid dynamics at this scale and highlighting the role of the frictional characteristics of the confining material. Finally, I examine the surface-controlled modification of applied electric fields in scanning ion conductance microscopy, proposing a new approach for the imaging of surface charge that may substantially improve on the spatial resolution of current techniques.
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Anthony R. Poggioli. Nonlinear ionic transport at the nanometric and Ångströmetric scales. Soft Condensed Matter [cond-mat.soft]. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLEE031⟩. ⟨tel-02869126⟩

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