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Strong Transient Flows Generated by Thermoplasmonic Bubble Nucleation.

Steven Jones1, Daniel Andrén1, Tomasz J Antosiewicz2

  • 1Department of Physics, Chalmers University of Technology, 41296 Gothenburg, Sweden.

ACS Nano
|December 8, 2020
PubMed
Summary
This summary is machine-generated.

We developed a new method using light-activated nanoantennas to create strong, controlled fluid flow transients in microfluidics. This breakthrough enables high-throughput applications in chemistry and life sciences.

Keywords:
Stokesletactive-manipulationbubblesflow generationthermoplasmonics

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Area of Science:

  • Microfluidics
  • Nanophotonics
  • Fluid Dynamics

Background:

  • Localized fluid flow control is crucial for microfluidic devices.
  • Efficient mass transport is essential for miniaturized systems in chemistry and life sciences.

Purpose of the Study:

  • To demonstrate a robust method for generating and quantifying strong flow transients.
  • To utilize light-induced vapor bubble nucleation on plasmonic nanoantennas for fluid actuation.

Main Methods:

  • Spatially isolated plasmonic nanoantennas were excited by light.
  • Vapor bubble nucleation was used to drive fluid flow.
  • Flow dynamics and viscosity dependence were analyzed.

Main Results:

  • Achieved peak flow speeds of millimeters per second in water.
  • Demonstrated modulation rates up to approximately 100 Hz.
  • Identified rapid bubble expansion as the primary driver of the flow transient.

Conclusions:

  • The developed methodology offers precise control over microfluidic flows.
  • The system supports high-throughput applications in various scientific fields.
  • The flow generation mechanism is primarily driven by bubble dynamics, not solely thermocapillary effects.