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Issue 31, 2017
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Surface hydration drives rapid water imbibition into strongly hydrophilic nanopores

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Abstract

The imbibition of liquids into nanopores plays a critical role in numerous applications, and most prior studies focused on imbibition due to capillary flows. Here we report molecular simulations of the imbibition of water into single mica nanopores filled with pressurized gas. We show that, while capillary flow is suppressed by the high gas pressure, water is imbibed into the nanopore through surface hydration in the form of monolayer liquid films. As the imbibition front moves, the water film behind it gradually densifies. Interestingly, the propagation of the imbibition front follows a simple diffusive scaling law. The effective diffusion coefficient of the imbibition front, however, is more than ten times larger than the diffusion coefficient of the water molecules in the water film adsorbed on the pore walls. We clarify the mechanism for the rapid water imbibition observed here.

Graphical abstract: Surface hydration drives rapid water imbibition into strongly hydrophilic nanopores

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Publication details

The article was received on 01 Apr 2017, accepted on 03 Jul 2017 and first published on 03 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP02115A
Citation: Phys. Chem. Chem. Phys., 2017,19, 20506-20512
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    Surface hydration drives rapid water imbibition into strongly hydrophilic nanopores

    C. Fang and R. Qiao, Phys. Chem. Chem. Phys., 2017, 19, 20506
    DOI: 10.1039/C7CP02115A

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