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3D Nanoparticle Tracking Inside the Silver Nanofluid.

Saeid Vafaei1

  • 1Mechanical Engineering Department, Bradley University, Peoria, IL 61625, USA.

Nanomaterials (Basel, Switzerland)
|February 28, 2020
PubMed
Summary

Researchers observed silver nanoparticles moving in nanofluids for the first time. This movement is likely caused by Marangoni flow, driven by surface tension gradients near the triple line.

Keywords:
nanofluidnanoparticletracking nanoparticles three-dimensionally (3D)

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Area of Science:

  • Nanotechnology
  • Fluid Dynamics
  • Surface Science

Background:

  • Understanding nanoparticle behavior in nanofluids is crucial for various applications.
  • Previous studies have not documented the intrinsic movement of silver nanoparticles within nanofluids.

Purpose of the Study:

  • To investigate and document the movement of silver nanoparticles in nanofluids.
  • To identify the underlying mechanisms responsible for observed nanoparticle motion.

Main Methods:

  • Microscopic observation using a 100X lens.
  • Incorporation of fluorescent nanoparticles for enhanced tracking.
  • Three-dimensional tracking of coated nanoparticles with a Delta Vision Elite inverted optical microscope.

Main Results:

  • Direct observation of continuous silver nanoparticle movement within the nanofluid.
  • Identification of Marangoni flow, generated by surface tension gradients at the triple line, as a probable cause.
  • Observed ring phenomenon when nanoparticle movement was minimal.

Conclusions:

  • Marangoni flow, driven by surfactant segregation and resulting surface tension gradients, explains silver nanoparticle movement.
  • The study provides novel insights into nanoparticle dynamics in nanofluids.
  • The ring phenomenon is associated with reduced nanoparticle mobility.