Reminiscent capillarity in subnanopores

Irena Deroche (), T. Jean Daou, Cyril Picard and Benoit Coasne ()
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Irena Deroche: Université de Haute Alsace, CNRS, ISMM, UMR 7361
T. Jean Daou: Université de Haute Alsace, CNRS, ISMM, UMR 7361
Cyril Picard: Université Grenoble Alpes, CNRS, LIPhy
Benoit Coasne: Université Grenoble Alpes, CNRS, LIPhy

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract 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 kBT 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 an adsorption energy and a capillary energy that remains meaningful even for severe confinements. A phenomenological model, based on Derjaguin’s 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.

Date: 2019
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DOI: 10.1038/s41467-019-12418-9

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