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Generation and Control of Electrohydrodynamic Flows in Aqueous Electrolyte Solutions
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Enhanced Heat Flow between Charged Nanoparticles and an Aqueous Electrolyte.

Reza Rabani1, Mohammad Hassan Saidi2, Ali Rajabpour3

  • 1Department of Mechanical Engineering, Karaj Branch, Islamic Azad University, Karaj 31499-68111, Iran.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 22, 2023
PubMed
Summary

Surface charge significantly enhances heat transfer between gold nanoparticles and electrolyte solutions, increasing interface thermal conductance threefold. This finding is crucial for applications like cancer therapy and solar energy conversion.

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Area of Science:

  • Interface Heat Transfer
  • Nanoparticle Science
  • Physical Chemistry

Background:

  • Heat transfer at nanoparticle-electrolyte interfaces is vital for applications such as cancer therapy, nanofluids, and solar energy.
  • The influence of surface charge and dissolved ions on this heat transfer remains largely unexplored.

Purpose of the Study:

  • To investigate the effect of surface charge and electrolyte ions on the interface thermal conductance of gold nanoparticles.
  • To quantify the enhancement in heat transfer due to nanoparticle surface charge.

Main Methods:

  • Utilized equilibrium molecular dynamics simulations to compute interface thermal conductance.
  • Simulated hydrophilic and hydrophobic charged gold nanoparticles immersed in an electrolyte solution.

Main Results:

  • A threefold increase in Kapitza conductance was observed for a nanoparticle surface charge of +320 mC/m² compared to uncharged nanoparticles.
  • The enhancement was largely independent of surface wettability, charge distribution, and salt concentration.
  • A master curve was developed relating Kapitza conductance enhancement to surface charge density.

Conclusions:

  • Increased Kapitza conductance is attributed to altered water density distribution and counterion accumulation near the charged nanoparticle surface.
  • Enhanced Coulombic interactions between the liquid and the charged nanoparticle contribute to improved heat transfer.
  • Provides insights into the role of ions in heat transfer phenomena at electrified surfaces.