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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

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Active Solid-State Nanopores: Self-Driven Flows/Chaos at the Liquid-Gas Nanofluidic Interface.

Vinitha Johny^1,2,3, Siddharth Ghosh^1,2,3,4,5

¹International Center for Nanodevices, INCeNSE-TBI, Indian Institute of Science Campus, Bangalore 560 012, Karnataka, India.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 29, 2023

Summary

We discovered self-driven fluid flow in nanoscale pores, leading to chaotic motion and a novel "active solid-state nanopore" concept for switching flow states. This advances understanding of fluid dynamics and enables new applications.

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Area of Science:

Nanofluidics
Fluid Dynamics
Interface Phenomena

Background:

Investigating fluid behavior at the nanoscale is crucial for developing advanced technologies.
Understanding liquid-gas interfaces in confined spaces presents unique challenges.
External forces are typically required to drive flow in micro/nanofluidic systems.

Purpose of the Study:

To comprehensively study self-driven flow dynamics at the liquid-gas interface in nanofluidic pores without external forces.
To analyze Rayleigh-Taylor instability phenomena in sub-100 nm pores.
To introduce and explore the concept of an
active solid-state nanopore
with self-driven flow switching capabilities.

Main Methods:

Theoretical modeling to derive a flow velocity equation.
Computational simulations for validation and analysis of mass transfer efficiency.
Experimental observation of nanoscale chaotic fluid motion.

Main Results:

A validated flow velocity equation for self-driven nanofluidic systems.
Demonstration of self-driven flow switching in an
active solid-state nanopore
without mechanical parts.
Observation of nanoscale chaos in fluid dynamics, distinct from macroscopic turbulence.

Conclusions:

Self-driven nanofluidics offers a new paradigm for fluid control at the liquid-gas interface.
The
active solid-state nanopore
concept has potential for applications in sensing, healthcare, and energy.
This research bridges the understanding of classical and quantum fluid dynamics in confined environments.