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Nanofluidic transport governed by the liquid/vapour interface.
Jongho Lee1, Tahar Laoui2, Rohit Karnik1
1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
Nature Nanotechnology
|March 18, 2014
Summary
Water transport across nanopores is limited by molecular reflection at liquid/vapor interfaces. This study quantifies water condensation probability, crucial for nanofluidic device design.
Area of Science:
- Nanofluidics
- Physical Chemistry
- Materials Science
Background:
- Liquid/vapour interfaces are critical in many systems but poorly understood.
- Their role in mass transport through nanoporous membranes is an active area of research.
- Understanding these interfaces is key to developing novel applications.
Purpose of the Study:
- To systematically investigate the influence of liquid/vapour interfaces on water transport in osmosis membranes.
- To determine the condensation probability of water molecules at these interfaces.
- To define the conditions under which these interfaces govern nanofluidic transport.
Main Methods:
- Experimental investigation of water transport across apposing liquid menisci in hydrophobic nanopores.
- Measurement of molecular reflection and condensation probabilities.
- Systematic variation of temperature to study its effect on condensation.
Main Results:
- Mass transport is limited by molecular reflection from the liquid/vapour interface below a specific length scale.
- This limitation depends on nanopore transmission probability and water condensation probability.
- Water condensation probability decreases with increasing temperature, from 0.36 ± 0.21 at 30 °C to 0.18 ± 0.09 at 60 °C.
Conclusions:
- Liquid/vapour interfaces play a crucial role in governing nanofluidic transport.
- The findings provide a quantitative understanding of water condensation at interfaces.
- This research has implications for nanofluidic devices, biological systems, and porous media.
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