Giant osmotic pressure in the forced wetting of hydrophobic nanopores

Abstract : The forced intrusion of water in hydrophobic nanoporous pulverulent material is of interest for quick storage of energy. With nanometric pores the energy storage capacity is controlled by interfacial phenomena. With subnanometric pores, we demonstrate that a breakdown occurs with the emergence of molecular exclusion as a leading contribution. This bulk exclusion effect leads to an osmotic contribution to the pressure that can reach levels never previously sustained. We illustrate on various electrolytes and different microporous materials, that a simple osmotic pressure law accounts quantitatively for the enhancement of the intrusion and extrusion pressures governing the forced wetting and spontaneous drying of the nanopores. Using electrolyte solutions, energy storage and power capacities can be widely enhanced.
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Submitted on : Thursday, August 13, 2015 - 11:49:15 AM
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Millán Michelin-Jamois, Cyril Picard, Gérard Vigier, Elisabeth Charlaix. Giant osmotic pressure in the forced wetting of hydrophobic nanopores. Physical Review Letters, American Physical Society, 2015, pp.036101. ⟨10.1103/PhysRevLett.115.036101⟩. ⟨hal-01170620v2⟩

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