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Heat Transport and Thermophysical Properties in Nanomaterials
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Heat Transport and Thermophysical Properties in Nanomaterials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 4654

Special Issue Editors

Prof. Dr. Bingyang Cao

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Guest Editor
School of Aerospace Engineering, Tsinghua University, Beijing, China
Interests: nanoscale heat transport; thermal functional materials; advanced thermal managements
Prof. Dr. Ming Hu

E-Mail Website
Guest Editor
Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA
Interests: computational materials physics; thermal science; machine learning; materials design
Dr. Sergey Sobolev

E-Mail Website
Guest Editor
Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
Interests: materials physics; thermodynamics; materials science

Special Issue Information

Dear Colleagues,

Heat transport at the nanoscale plays a critical role in energy, informational and communication, advanced materials, manufacturing, vehicles, and aerospace areas in which nanomaterials have been widely involved. Beyond the classical Fourier’s law for diffusive heat conduction at the normal scale, nanoscale heat transport may refer to size-induced ballistic effects, phonon hydrodynamics for normal scattering, coherence considering wave nature of phonons, and thermal waves for superfast heating. Interfaces are demonstrated to not only supply additional scattering and resistance but also be able to rectify heat flows depending on the flow directions. The thermal conductivity of nanomaterials can be decreased or enhanced compared with their bulk counterparts. Thermal functional materials can be achieved with high, low, even tunable thermophysical properties, which will benefit thermal management technologies. Theoretical, numerical, and experimental efforts in methodology have been made toward the understanding and control of heat transport at the nanoscale. The aim of this Special Issue is to provide a platform for researchers to disseminate and review recent advances as well as up-to-date progresses in the nanoscale heat transport areas. The topics of interest are expected to cover heat transport physics in nanostructures, thermophysical properties of nanomaterials, thermal functional materials and their applications, related methodologies, etc.

Prof. Dr. Bingyang Cao
Prof. Dr. Ming Hu
Prof. Dr. Sergey Sobolev
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanoscale heat transport
  • non-Fourier’s heat conduction
  • thermal conductivity of nanostructures
  • thermal functional materials
  • nanoscale thermal management

Published Papers (3 papers)

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Research

11 pages, 2574 KiB  
Article
Rapid Multicomponent Alloy Solidification with Allowance for the Local Nonequilibrium and Cross-Diffusion Effects
by Sergey L. Sobolev, Mikhail G. Tokmachev and Yuri R. Kolobov
Materials 2023, 16(4), 1622; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16041622 - 15 Feb 2023
Cited by 2 | Viewed by 1059
Abstract
Motivated by the fast development of various additive manufacturing technologies, we consider a mathematical model of re-solidification of multicomponent metal alloys, which takes place after ultrashort (femtosecond) pulse laser melting of a metal surface. The re-solidification occurs under highly nonequilibrium conditions when solutes [...] Read more.
Motivated by the fast development of various additive manufacturing technologies, we consider a mathematical model of re-solidification of multicomponent metal alloys, which takes place after ultrashort (femtosecond) pulse laser melting of a metal surface. The re-solidification occurs under highly nonequilibrium conditions when solutes diffusion in the bulk liquid cannot be described by the classical diffusion equation of parabolic type (Fick law) but is governed by diffusion equation of hyperbolic type. In addition, the model takes into account diffusive interaction between different solutes (nonzero off-diagonal terms of the diffusion matrix). Numerical simulations demonstrate that there are three main re-solidification regimes, namely, purely diffusion-controlled with solute partition at the interface, partly diffusion-controlled with weak partition, and purely diffusionless and partitionless. The type of the regime governs the final composition of the re-solidified material, and, hence, may serve as one of the main tools to design materials with desirable properties. This implies that the model is expected to be useful in evaluating the most effective re-solidification regime to guide the optimization of additive manufacturing processing parameters and alloys design. Full article
(This article belongs to the Special Issue Heat Transport and Thermophysical Properties in Nanomaterials)
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15 pages, 1100 KiB  
Article
Heat Transport on Ultrashort Time and Space Scales in Nanosized Systems: Diffusive or Wave-like?
by S. L. Sobolev and Weizhong Dai
Materials 2022, 15(12), 4287; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15124287 - 17 Jun 2022
Cited by 10 | Viewed by 1266
Abstract
The non-Fourier effects, such as wave-like temperature propagation and boundary temperature jumps, arise in nanosized systems due to the multiple time and space scales nature of out-of-equilibrium heat transport. The relaxation to equilibrium occurs in successive time and space scales due to couplings [...] Read more.
The non-Fourier effects, such as wave-like temperature propagation and boundary temperature jumps, arise in nanosized systems due to the multiple time and space scales nature of out-of-equilibrium heat transport. The relaxation to equilibrium occurs in successive time and space scales due to couplings between different excitations, whose relaxation times have different physical meanings and may differ significantly in magnitude. The out-of-equilibrium temperature evolution is described by a hierarchy of partial differential equations of a higher order, which includes both the diffusive and wave modes of heat transport. The critical conditions of transition from wave to diffusive modes are identified. We demonstrate that the answer to the question concerning which of these modes would be detected by experimental measurements may also depend on the accuracy of the experimental setup. Comparisons between the proposed approach and other non-Fourier models, such as the Guyer–Krumhansl and Jeffreys type, are carried out. The results presented here are expected to be useful for the theoretical and experimental treatment of non-Fourier effects and particularly heat wave phenomena in complex nanosized systems and metamaterials. Full article
(This article belongs to the Special Issue Heat Transport and Thermophysical Properties in Nanomaterials)
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14 pages, 1195 KiB  
Article
Electron Heat Source Driven Heat Transport in GaN at Nanoscale: Electron–Phonon Monte Carlo Simulations and a Two Temperature Model
by Anish Muthukunnil Joseph and Bingyang Cao
Materials 2022, 15(5), 1651; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15051651 - 23 Feb 2022
Cited by 12 | Viewed by 1726
Abstract
The thermal energy transport in semiconductors is mostly determined by phonon transport. However in polar semiconductors like GaN electronic contribution to the thermal transport is non-negligible. In this paper, we use an electron–phonon Monte Carlo (MC) method to study temperature distribution and thermal [...] Read more.
The thermal energy transport in semiconductors is mostly determined by phonon transport. However in polar semiconductors like GaN electronic contribution to the thermal transport is non-negligible. In this paper, we use an electron–phonon Monte Carlo (MC) method to study temperature distribution and thermal properties in a two-dimensional GaN computational domain with a localized, steady and continuous electron heat source at one end. Overall, the domain mimics the two-dimensional electron gas (2DEG) channel of a typical GaN high electron mobility transistor (HEMT). High energy electrons entering the domain from the source interact with the phonons, and drift under the influence of an external electric field. Cases of the electric field being uniform and non-uniform are investigated separately. A two step/temperature analytical model is proposed to describe the electron as well as phonon temperature profiles and solved using the finite difference method (FDM). The FDM results are compared with the MC results and found to be in good agreement. Full article
(This article belongs to the Special Issue Heat Transport and Thermophysical Properties in Nanomaterials)
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