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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Manipulating thermal resistance at the solid-fluid interface through monolayer deposition.

Mohammad Rashedul Hasan1, Truong Quoc Vo2, BoHung Kim1

  • 1School of Mechanical Engineering, University of Ulsan Daehak-ro 93, Namgu Ulsan 680-749 South Korea bohungk@ulsan.ac.kr.

RSC Advances
|May 6, 2022
PubMed
Summary
This summary is machine-generated.

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Adding a monolayer to solid substrates significantly impacts heat transfer. Monolayer atomic mass is the primary factor influencing interfacial thermal resistance, or Kapitza resistance, regardless of particle interactions.

Area of Science:

  • Materials Science
  • Thermodynamics
  • Computational Physics

Background:

  • Heat transfer at solid-fluid interfaces is crucial for many applications.
  • Interfacial thermal resistance (Kapitza resistance) governs heat flow across dissimilar materials.
  • Monolayer coatings can modify interfacial properties, but their precise impact on heat transfer is not fully understood.

Purpose of the Study:

  • To investigate the effect of monolayer properties on heat transfer at a solid-fluid interface.
  • To quantify the influence of monolayer atomic mass and inter-particle interaction energy on Kapitza resistance.
  • To elucidate the underlying mechanisms governing heat transfer modulation by monolayers.

Main Methods:

  • Non-equilibrium molecular dynamics simulations were employed.

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  • System parameters included a solid substrate, a fluid, and a monolayer coating.
  • Monolayer properties varied: atomic mass (m_M) and interaction energy (ε_MM).

    • Main Results:

    • Interfacial thermal resistance (Kapitza resistance) is significantly affected by monolayer insertion.
    • Kapitza length increases monotonically with increasing monolayer atomic mass (m_M), independent of ε_MM.
    • Fluid adsorption has a secondary role compared to monolayer properties in altering Kapitza resistance.

    Conclusions:

    • Monolayer atomic mass is a dominant factor determining Kapitza resistance at the solid-fluid interface.
    • The observed trends can be explained by analyzing phonon spectrum overlap via vibrational density of states.
    • A fourth-order polynomial function describes the combined effect of m_M and ε_MM on Kapitza resistance.