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Membranes: a variety of energy landscapes for many transfer opportunities

Bacchin, Patrice Membranes: a variety of energy landscapes for many transfer opportunities. (2018) Membranes, 8(1) (10). 1-17. ISSN 2077-0375

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Official URL: http://dx.doi.org/10.3390/membranes8010010

Abstract

A membrane can be represented by an energy landscape that solutes or colloids must cross. A model accounting for the momentum and the mass balances on the membrane energy landscape establishes a new way of writing for the Darcy law. The counter pressure in the Darcy law is no longer written as the result of an osmotic pressure difference but rather as a function of colloid-membrane interactions. The ability of the model to describe the physics of the filtration is discussed in detail. This model is solved on a simplified energy landscape to derive analytical relationships that describe the selectivity and the counter pressure from ab-initio operating conditions. The model shows that the stiffness of the energy landscape has an impact on the process efficiency: a gradual increase in interactions (like with hourglass pore shape) can reduce the separation energetic cost. It allows the introduction of a new paradigm to increase membrane efficiency: the accumulation that is inherent to the separation must be distributed across the membrane. Asymmetric interactions thus lead to direction-dependent transfer properties and the membrane exhibits diode behavior. These new transfer opportunities are discussed.

Item Type:Article
Additional Information:Thanks to MDPI Open Access Journals editor. The original PDF of the article can be found at Membranes website : http://www.mdpi.com/2077-0375/8/1/10
HAL Id:hal-01729329
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Patrice Bacchin
Deposited On:12 Mar 2018 14:25

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