Quand

16 mars 2023    
10:00 - 11:30

Type d’évènement

Jeudi 16 Mars 2023
10h
Séminaire de
Soufiane Abdelghani-Idrissi et Lucie Ries
ENS
“Resonant nanofluidic transport for efficient Voltage Induced Reverse Osmosis”

Resonant nanofluidic transport for efficient Voltage Induced Reverse Osmosis
Soufiane AbdelghaniIdrissi1, Lucie Ries1, Alessandro Siria1, Lydéric Bocquet1,*

Affiliations:
1 Laboratoire de Physique de l’Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne
Université, Université de Paris, Paris, France

*Corresponding author. Email: Lyderic.bocquet@ens.fr

Abstract:

Worldwide access to fresh water is one of the key challenges of our modern society. Desalination of salted water is an energetically costly process usually carried out by reverse osmosis (RO). Unsalted water sources such as rivers face the problem of the presence of micropollutants, which are present even after conventional treatments. In order to avoid the use of high pressure inherent to RO we report here an novel concept for water filtration using nonlinear nanofluidic transport through composite membranes made of advanced nanomaterials. A rectified electroosmotic water flow is induced through the nanostructure of the material under the solicitation of an external sinusoidal electric field. The water flow is mediated by the inherent surface charge at the liquidsolid interface, while the selectivity of the composite allows the filtration of salts and micropollutants. We show that the generated EO flow present a resonant behavior which allow to reach high flow rate Our work significantly expands possibilities of water filtration by showing a macroscopic use of Shockley diode behaviors in nanofluidic transport.
Conférence : Soufiane Abdelghani-Idrissi et Lucie Ries – 16/3/2023 à 10h
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