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Updated: Sep 10, 2025
10:11
Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
Published on: April 19, 2021
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Interfacial Thermal Transport over Solid-Liquid Interfaces Mediated by Heterogeneous Self-Assembled Monolayers: A
Qing-Yao Luo1,2, Donatas Surblys1, Gota Kikugawa1
1Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
The Journal of Physical Chemistry. B
|August 20, 2025
Summary
Optimizing nanodevice thermal management requires careful design of self-assembled monolayers (SAMs). Stiffer, densely packed heterogeneous SAMs significantly reduce interfacial thermal resistance (ITR) by increasing liquid contact area.
Area of Science:
- Materials Science
- Nanotechnology
- Computational Physics
Background:
- Interfacial thermal management is crucial for nanodevice efficiency.
- Self-assembled monolayers (SAMs) with heterogeneous chain lengths offer a promising strategy for improving thermal transport at solid-liquid interfaces.
- Limited research exists on the impact of SAM properties on interfacial thermal resistance (ITR).
Purpose of the Study:
- To systematically investigate the influence of liquid-induced SAM stiffness and patterned densities of heterogeneous SAMs on ITR.
- To explore these effects across various SAM-liquid affinities at gold-polymer liquid interfaces.
- To provide molecular-level insights for designing effective thermal management strategies.
Main Methods:
- Utilized nonequilibrium molecular dynamics (MD) simulations.
- Examined SAM-mediated gold-polymer liquid interfaces.
- Investigated systems with varying SAM-liquid affinities and heterogeneous SAM arrangements.
Main Results:
- Hydrophobic alkanethiol SAMs, being stiffer, preserved structure and increased liquid contact area, leading to lower ITR.
- Hydrophilic poly(ethylene glycol) (PEG)-COOH SAMs, being softer, showed limited ITR reduction, especially at high affinities.
- Liquid adsorption density and hydrogen bonding were identified as key factors influencing ITR.
Conclusions:
- Dense arrangements of alternating stiff SAM lengths are recommended for minimizing ITR.
- SAM stiffness is a critical parameter for molecular design in patterned SAM surfaces.
- These findings are vital for advancing thermal management in nanodevices with solid-liquid interfaces.
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