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Surface Bubble Growth in Plasmonic Nanoparticle Suspension.

Qiushi Zhang1, Robert Douglas Neal2, Dezhao Huang1

  • 1Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States.

ACS Applied Materials & Interfaces
|May 14, 2020
PubMed
Summary

Microbubble growth dynamics are faster in nanoparticle suspensions due to volumetric heating. This finding enhances applications in microfluidics and photothermal energy conversion by enabling tunable bubble growth rates.

Keywords:
bubble growth dynamicsgold nanoparticles (NPs)microbubblesphotothermalplasmon resonancepulsed laservolumetric heating

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Plasmonic heating is typically used to generate surface microbubbles on pre-deposited plasmonic structures.
  • Understanding microbubble dynamics is crucial for applications in microfluidics, catalysis, micropatterning, and photothermal energy conversion.

Purpose of the Study:

  • To investigate the growth dynamics of surface microbubbles generated in plasmonic nanoparticle (NP) suspensions.
  • To compare bubble growth rates in NP suspensions with those in pure water using surface plasmonic structures.

Main Methods:

  • Generating surface microbubbles in plasmonic nanoparticle suspensions using laser heating.
  • Analyzing bubble growth rates and correlating them with nanoparticle concentration, laser power, and dissolved gas levels.

Main Results:

  • Observed significantly faster microbubble growth rates in nanoparticle suspensions compared to pure water.
  • Identified volumetric heating around the bubble, caused by nanoparticles, as the primary reason for enhanced growth.
  • Demonstrated that bubble growth rates are tunable by adjusting nanoparticle concentration, laser power, and dissolved gas concentration.

Conclusions:

  • Volumetric heating in nanoparticle suspensions offers a more efficient mechanism for microbubble generation and growth than surface heating.
  • The tunable nature of microbubble growth in NP suspensions opens new possibilities for precise control in various applications.
  • This research provides a foundation for optimizing plasmonic heating applications through nanoparticle engineering.