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Membranes: A Variety of Energy Landscapes for Many Transfer Opportunities

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 in 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 in 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 (such as 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.
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Submitted on : Thursday, November 15, 2018 - 4:34:26 PM
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Patrice Bacchin. Membranes: A Variety of Energy Landscapes for Many Transfer Opportunities. Membranes, MDPI, 2018, 8 (1), pp.1-17. ⟨10.3390/membranes8010010⟩. ⟨hal-01924110⟩



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