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Article Dans Une Revue Nature Communications Année : 2019

Reminiscent capillarity in subnanopores

Résumé

Fluids in large and small pores display different behaviors with a crossover described through the concept of critical capillarity. Here we report experimental and simulation data for various siliceous zeolites and adsorbates that show unexpected reminiscent capillarity for such nanoporous materials. For pore sizes D exceeding the fluid molecule size, the filling pressures p are found to follow a generic behavior k B T ln p ∼ γ/ρD where γ and ρ are the fluid surface tension and density. This result is rationalized by showing that the filling chemical potential for such ultra-small pores is the sum of (1) an adsorption energy and (2) a capillary energy that remains meaningful even for severe confinements. A phenomenological model, based on Derjaguins formalism to bridge macroscopic and molecular theories for condensation in porous materials, is developed to account for the behavior of fluids confined down to the molecular scale from simple parameters.
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Dates et versions

hal-02328687 , version 1 (05-11-2020)

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Irena Deroche, T. Jean Daou, Cyril Picard, Benoit Coasne. Reminiscent capillarity in subnanopores. Nature Communications, 2019, 10 (1), ⟨10.1038/s41467-019-12418-9⟩. ⟨hal-02328687⟩
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