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Liquids flowing on solid surfaces experience a friction force. Whereas solid
friction is familiar to anyone gifted with the sense of touch, liquid friction
is much more exotic. Although it was long believed to be infinite, meaning that
interfacial liquid molecules stick to solid surfaces, we have known for a few
decades that this is not the case and that some materials show extreme liquid
slippage, which implies a dramatic enhancement of nanoscale pipes' permeability
to liquid flows. Harnessing liquid friction bears the promise of
high-efficiency membrane separation processes, heat recovery systems, or blue
energy harvesting, turning it into a highly strategic field to reduce carbon
emissions and meet the climate emergency.
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