Skip to Main content Skip to Navigation
Journal articles

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.
Complete list of metadata

Cited literature [54 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01924110
Contributor : Open Archive Toulouse Archive Ouverte (oatao) <>
Submitted on : Thursday, November 15, 2018 - 4:34:26 PM
Last modification on : Friday, February 19, 2021 - 4:20:02 PM

File

Bacchin_21132.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

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⟩

Share

Metrics

Record views

53

Files downloads

167