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Snap-through in Graphene Nanochannels: With Application to Fluidic Control.

Shuping Jiao¹, Mingchao Liu²

¹Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematics and Mechanics, School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China.

ACS Applied Materials & Interfaces

|December 23, 2020

Summary

Researchers explored flow-induced snap-through in wrinkled graphene nanochannels. This phenomenon allows passive control of water transport and selective ion/molecule filtration, paving the way for advanced membrane technologies.

Keywords:

flexible wrinkles fluidic control graphene nanochannel molecule selection snap-through

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Area of Science:

Materials Science
Nanotechnology
Fluid Dynamics

Background:

Water transport in graphene nanochannels is crucial for filtration technology.
Elastic instabilities, like snap-through, influence fluid flow in larger systems.
The effect of wrinkled graphene structures on water transport and filtration efficiency is not well understood.

Purpose of the Study:

To investigate flow-induced snap-through in graphene nanochannels.
To explore the application of this phenomenon in passive fluid flow control and ion/molecule selection.
To understand how flexible, wrinkled graphene structures impact water transport and filtration.

Main Methods:

Molecular simulations combined with theoretical analysis.
Introduction of a flexible arch within a graphene nanochannel.
Observation and analysis of the snap-through transition triggered by fluid flux.

Main Results:

Observed snap-through of the graphene arch due to varying fluid flux.
Critical snap transition velocity depends non-monotonically on channel and arch geometry.
Demonstrated reversible snap-through by securing the arch ends.

Conclusions:

Flow-induced snap-through in graphene nanochannels can passively control fluid flow.
This mechanism shows potential for ion/molecule selection in filtration.
Results suggest applications in designing foul-resistant, reusable filter membranes.