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Related Experiment Video

Updated: Jan 25, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Low-Frequency In-Plane Phonons Dominate Thermal Transport in Montmorillonite: Machine-Learning Molecular Dynamics

Chao Zhang^1,2,3,4, Bo Xu¹, Jing Wan⁵

¹School of Water Conservancy and Transportation/Yellow River Laboratory/Underground Engineering Research Institute, Zhengzhou University, Zhengzhou 450001, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 24, 2026

Summary

Montmorillonite

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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

Published on: December 5, 2025

Area of Science:

Geophysics
Materials Science
Computational Chemistry

Background:

Montmorillonite (MMT) is crucial for permafrost thermophysical properties.
Cryogenic experimental challenges limit understanding of MMT thermal transport.
Classical molecular dynamics has limitations at low temperatures.

Purpose of the Study:

Develop a high-precision, data-driven model for MMT thermal conductivity.
Investigate MMT thermal transport mechanisms using advanced computational methods.
Provide theoretical insights for permafrost stability and cold-region engineering.

Main Methods:

Integrated neuroevolution potential (NEP) framework with active learning.
Employed nonequilibrium molecular dynamics, homogeneous nonequilibrium molecular dynamics, and spectral heat current.
Systematically simulated and compared MMT thermal conductivity.

Main Results:

MMT thermal conductivity is 4.28 W m⁻¹ K⁻¹ at 300 K.
In-plane phonons (>85%) and low-frequency modes (<20 THz) dominate thermal transport.
Increased temperature reduces thermal conductivity due to enhanced phonon-phonon scattering.

Conclusions:

The NEP model accurately predicts thermal conductivity for complex minerals like MMT.
Thermal transport is governed by dispersive, long-lived, low-frequency in-plane phonons.
Findings offer a theoretical basis for permafrost thermal stability and cold-region engineering.