Journal
NANO LETTERS
Volume 20, Issue 12, Pages 8965-8971Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04331
Keywords
thereto-osmosis; interfacial flow; nanofluidics; molecular dynamics
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Funding
- National Natural Science Foundation of China [51888103, 52025061]
- Royal Society-Newton Advanced Fellowship grant [NAF\R1\191163]
- U.S. National Science Foundation [CHE-1900510]
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Thermo-osmosis driven by temperature gradients generally requires two liquid reservoirs at different temperatures connected by porous bodies or capillaries. We demonstrate, by molecular dynamics simulation, a new phenomenon toward nanoscale thermo-osmosis. Upon heating at a certain region of a nanochannel, multiple nanoscale convective layers are formed and can be manipulated to generate a net fluid transport from one reservoir to another, even without a temperature difference between them. A net unidirectional fluid transport with different rates can be achieved by precisely controlling location of the heated region. The net fluid transport can be enhanced further by tuning liquid-wall interactions. The demonstrated phenomenon provides a strategy for enhancing fluid mixing, which is often inefficient in nanoscale flows. Our finding is promising for chip-level cooling. The heat generated by chips can be employed to produce asymmetric temperature gradients in channels through proper configuration. Coolant liquids can thus be circulated without extra pumps.
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