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Open research questions in Thermal properties of materials

174 gap statements mined from Thermal properties of materials papers in our 7.9M-paper local library, which holds 2,038 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • Future work will focus on cross-potential benchmarking, larger model lengths and independent interfacial configurations, followed by multiscale and experimental validation in bulk cementitious composites. The main limitations of the present study are the use of a single ReaxFF parameterization and finite-size RNEMD extrapolation.

    Interfacial Thermal Transport and Phonon Scattering of Graphene and Graphene Oxide Embedded in Calcium Silicate Hydrate: A Molecular Dynamics Study · 2026 · DOI

  • The conventional view that thermal transport capability is spatially uniform throughout the system is challenged by recent experiments. A fundamental understanding of nanoscale hotspot thermal transport is lacking. The effects and mechanisms of hotspot spacing on thermal transport are not well understood.

    Non-uniform thermal conductivity in nanoscale multiple hotspot systems · 2026 · DOI

  • Despite notable progress, several challenges remain before BNNSs can be widely adopted in industrial thermal management technologies. Scalable synthesis of large-area, high quality BNNSs. Achieving large-scale production of BNNSs with ultrathin thickness, large lateral size, and high structural integrity remains a central challenge for their practical deployment in advanced thermal management and electronic systems.

    Hexagonal Boron Nitride Nanosheets: Properties, Preparation and Applications in Thermal Management · 2026 · DOI

  • Specifically, we explored the effects of phonon/magneton quantization on ITC in ultra-low-temperature or topological interfaces and established standards for uncertainty analysis in experimental measurements (e.g., laser spot size calibration, thermal model error correction) to improve data comparability.

    Interface Thermal Resistance in Heterostructures of Micro–Nano Power Devices: Current Status and Future Challenges · 2025 · DOI

  • The paper identifies the limited thermal conductivity of polymer materials as a research gap. The lack of effective methods to improve thermal conductivity is also a gap. The paper aims to address this gap by investigating hybrid fillers.

    Enhanced Thermal Conductivity of High-Density Polyethylene Composites with Hybrid Fillers of Flaky and Spherical Boron Nitride Particles · 2024 · DOI

  • The paper identifies the gap in current methods, which require high filler content and compromise mechanical properties. It also identifies the need for a viable approach to enhance thermal conductivity in polymer composites.

    Enhancing Thermal Conductivity in Polymer Composites through Molding-Assisted Orientation of Boron Nitride · 2024 · DOI

  • Traditional thermal management strategies have limitations, such as inflexibility and high weight. There is a need for novel thermal conductive materials that can meet the evolving demands of the electronics sector. The development of a 3D structural thermal conductive network using DIW printing technology addresses this gap.

    DIW-Printed Thermal Management PDMS Composites with 3D Structural Thermal Conductive Network of h-BN Platelets and Al2O3 Nanoparticles · 2024 · DOI

  • However, the effect of polarization direction on thermal transport is still not well understood.

    Polarization flip induced phonon branch decoupling and significant suppression of thermal transport behavior in α − In 2 Se 3 · 2025 · DOI

  • However, a comprehensive theoretical understanding of the structural dependence of thermal transport and the underlying microscopic mechanisms is lacking.

    Density dependence of thermal conductivity in nanoporous and amorphous carbon with machine-learned molecular dynamics · 2025 · DOI

  • Type-I clathrate solids have attracted significant interest due to their ultralow thermal conductivities and subsequent promise for thermoelectric applications, yet the mechanisms underlying these properties are not well understood.

    Strong anharmonicity dictates ultralow thermal conductivities of type-I clathrates · 2025 · DOI

  • However, a general metric for quickly characterizing the contributions to interfacial thermal conductance from elastic and inelastic phonon scattering processes is lacking.

    Metric for quantifying elastic and inelastic thermal transport at interfaces · 2024 · DOI

  • To address this open question, we have systematically investigated the effects of tensile strain on the \ensuremath{\kappa} of graphene using the exact solution of the Peierls-Boltzmann transport equation based on the first-principles interatomic force constants combined with machine learning assisted molecular dynamics simulations.

    Convergent thermal conductivity in strained monolayer graphene · 2024 · DOI

  • However, the underlying cause of this low lattice thermal conductivity in the lightweight ${\mathrm{Mg}}_{3}{\mathrm{Sb}}_{2}$ remains unclear.

    Realizing high phonon anharmonicity in layered Mg 3 Sb 2 : A temperature-dependent optical phonon study · 2024 · DOI

  • However, the relationship between twist angle and phonon hydrodynamics remains insufficiently explored.

    Numerical evaluation of the effect of the twist angle on phonon hydrodynamics in twisted bilayer graphene · 2024 · DOI

  • However, experimental thermal conductivity data in this regime are scarce and often limited to specific materials and geometries.

    Cryogenic thermal transport properties from accelerated first-principles calculations: Role of boundary and isotope scattering · 2024 · DOI

  • However, a rigorous demonstration and microscopic origin of this behavior are still lacking.

    Unusual temperature dependence of thermal conductivity due to phonon resonance scattering by point defects in cubic BN · 2024 · DOI

  • The current understanding of interfacial heat transport remains incomplete. The dependence of ITC on the transition layer thickness and atomic structures is not well understood.

    Achieving optimal GaN/SiC interfacial thermal conductance via ultrathin alloy interlayers for high-power device cooling · 2026 · DOI

  • Traditional thermal interface materials are inadequate for efficient heat dissipation due to their low thermal conductivity. There is a need for the development of new materials and structures that can provide high thermal conductivity and electromagnetic interference shielding performance.

    Trunk-branch-inspired carbon fiber scaffolds with boron nitride network for heat dissipation and electromagnetic interference shielding · 2026 · DOI

  • In this comprehensive review, we have thoroughly examined the development of TCPCs, detailing the advancements in this field, elucidating the thermal conduction mechanisms of these materials, and discussing factors that influence their thermal properties, such as the inherent characteristics of the polymers, interface thermal resistance, and thermal performance of fillers.

    Thermal Conductive Polymer Composites: Recent Progress and Applications · 2024 · DOI

  • Their practical use can be limited by their thermal transport properties, which have proven challenging to determine accurately, both from a theoretical and experimental perspective.

    Microscopic understanding of the in-plane thermal transport properties of 2H transition metal dichalcogenides · 2024 · DOI

  • However, the temperature-dependent phonon properties, especially the anharmonicity at high temperatures, are poorly understood.

    High-order phonon anharmonicity and thermal conductivity in GaN · 2024 · DOI

  • The study only considers a limited set of point defects. The simulations are performed at a fixed concentration of 0.46%. The paper does not account for other types of defects or impurities.

    Thermal Transport in Defective Uranium Nitride: Effects of Point Defects, Anharmonicity, and Electronic Contributions · 2026

  • Investigating the effects of different hotspot sizes and spacings on thermal transport. Exploring the application of the local thermal conductivity in various electronic devices. Studying the thermal transport in systems with multiple hotspots of different sizes and shapes.

    Non-uniform thermal conductivity in nanoscale multiple hotspot systems · 2026 · DOI

  • Investigating the effects of varying BN content on the thermal conductivity of PS/BN composites, - Examining the mechanical properties of PS/BN composites with different molding parameters, - Studying the long-term stability of the thermal conductivity of PS/BN…

    Enhancing Thermal Conductivity in Polymer Composites through Molding-Assisted Orientation of Boron Nitride · 2024 · DOI

  • Simulating time evolutions of specific models on small-scale quantum computers. Checking the non-Abelian ETH's predictions for thermalization in the presence of non-Abelian symmetries. Deriving a fluctuation-dissipation relation for SU(2)-symmetric systems.

    Numerical evidence for the non-Abelian eigenstate thermalization hypothesis · 2026 · DOI

Most-cited papers in Thermal properties of materials

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Open questions raised by papers listed on this page include: (1) Future work will focus on cross-potential benchmarking, larger model lengths and independent interfacial configurations, followed by multiscale and experimental validation in bulk cementitious composites (“Interfacial Thermal Transport and Phonon Scattering of Graphene and Graphene…”, 2026); (2) A fundamental understanding of nanoscale hotspot thermal transport is lacking (“Non-uniform thermal conductivity in nanoscale multiple hotspot systems”, 2026); (3) The dependence of ITC on the transition layer thickness and atomic structures is not well understood (“Achieving optimal GaN/SiC interfacial thermal conductance via ultrathin alloy…”, 2026); (4) There is a need for the development of new materials and structures that can provide high thermal conductivity and electromagnetic interference shielding performance (“Trunk-branch-inspired carbon fiber scaffolds with boron nitride network for…”, 2026); (5) The effect of polarization direction on thermal transport is still not well understood (“Polarization flip induced phonon branch decoupling and significant suppression…”, 2025). 174 gap statements have been mined from Thermal properties of materials papers in our 7.9M-paper local library, which holds 2,038 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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