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Engineering tube shapes to control confined transport

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Abstract

Transport of particles in confined structures can be modeled by means of diffusion in a potential of entropic nature. The entropic transport model proposes a drift-diffusion kinetic equation for the evolution of the probability density in which the diffusion coefficient depends on position and the drift term contains an entropic force. The model has been applied to analyze transport in single cavities and through periodic structures of different shape, and to investigate the nature of non-equilibrium fluctuations as well. The transport characteristics depends strongly on the contour of the region through which particles move, which defines the entropic potential. We show that the form of the entropic potential can be properly designed to optimize and govern how molecules diffuse and get drifted in tortuous channels. The shape of a tube or channel can be smartly engineered to control transport for the desired application.

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Authors and Affiliations

  1. Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Martí i Franquès 1, 08028, Barcelona, Spain

    D. Reguera & J. M. Rubi

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  1. D. Reguera
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  2. J. M. Rubi
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Correspondence to D. Reguera.

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Reguera, D., Rubi, J.M. Engineering tube shapes to control confined transport. Eur. Phys. J. Spec. Top. 223, 3079–3093 (2014). https://doi.org/10.1140/epjst/e2014-02320-x

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  • DOI: https://doi.org/10.1140/epjst/e2014-02320-x

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