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Nanomaterials
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Nanoscale Heat Transfer Phenomena: Ballisticity, Rectification, Collective Modes, Thermohydrodynamics, Coherence
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Nanoscale Heat Transfer Phenomena: Ballisticity, Rectification, Collective Modes, Thermohydrodynamics, Coherence

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (15 March 2024) | Viewed by 3804

Special Issue Editors

Dr. Termentzidis Konstantinos

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Guest Editor
Laboratoire CETHIL UMR 5008, CNRS, INSA of Lyon, Un. Claude-Bernard Lyon 1, LyonTech la Doua Campus, Bat Sadi Carnot, INSA de LYON, 9 Rue de la Physique, 69100 Villeurbanne, France
Interests: heat transfer models and simulations; nanostructured semiconductors; thermal conductivity; atomistic simulations
Special Issues, Collections and Topics in MDPI journals
Dr. Giorgia Fugallo

E-Mail Website
Guest Editor
Laboratoire de thermique et énergie de Nantes, LTeN, UMR 6607 CNRS, École Polytechnique de l'Université de Nantes Site de la Chantrerie - Rue Christian Pauc BP 50609, CEDEX 3, 44306 Nantes, France
Interests: thermal-radiative properties; IR-VIS-UV spectroscopy; semiconductors materials; multilayers and 2D materials; ab initio; many body and classical numerical simulations
Dr. Yangyu Guo

E-Mail Website
Guest Editor
School of Energy Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Harbin 150001, China
Interests: quantum/coherent heat transport; phonon hydrodynamics; extremely near-field heat transport
Dr. F. Xavier Alvarez

E-Mail Website
Guest Editor
Department of physics, Universitat Autónoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
Interests: hydrodynamic thermal transport; ballistic transport; transport processes; nonequilibrium thermodynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The thermal transport differs significantly in nanostructures and nanostructured materials compared to their bulk state. In the last two decades, both computational and experimental studies have revealed several new phenomena like phonon confinement, blocking/focusing, or coherent, collective thermo-hydrodynamics, as well as rectification effects and new regimes like ballistic or quasi-ballistic related to like-Levy phonon flights. Observations showed that the Fourier’s Law or even the Boltzmann’s Transport Equation cannot capture these phenomena, as there is a breakdown of the macroscopic well-established heat dissipation theory due to the relative comparison of the phonon mean free paths/coherence length with the characteristic dimensions of the nanostructures and the presence of interfaces and free surfaces.

This Special Issue in Nanomaterials will attempt to cover the most recent advances in “Nanoscale Heat Transfer Phenomena” and both experimental and theoretical evidences of ballistic transport, rectification, phonon collective modes, Levy phonon flights, and classical thermohydrodynamics.

We look forward to receiving your contributions.

Dr. Termentzidis Konstantinos
Dr. Giorgia Fugallo
Dr. Yangyu Guo
Dr. F. Xavier Alvarez
Guest Editors

Manuscript Submission Information

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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. Nanomaterials 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 2900 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

  • nanostructures
  • nanostructured materials
  • phonon confinement
  • coherence
  • collective modes
  • anharmonicity
  • thermohydrodynamics
  • rectification effects
  • ballistic or quasi-ballistic regime
  • experimental and theoretical studies

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Published Papers (2 papers)

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Research

16 pages, 3896 KiB  
Article
Super-Suppression of Long-Wavelength Phonons in Constricted Nanoporous Geometries
by P. Alex Greaney, S. Aria Hosseini, Laura de Sousa Oliveira, Alathea Davies and Neophytos Neophytou
Nanomaterials 2024, 14(9), 795; https://doi.org/10.3390/nano14090795 - 3 May 2024
Viewed by 1271
Abstract
In a typical semiconductor material, the majority of the heat is carried by long-wavelength, long-mean-free-path phonons. Nanostructuring strategies to reduce thermal conductivity, a promising direction in the field of thermoelectrics, place scattering centers of size and spatial separation comparable to the mean free [...] Read more.
In a typical semiconductor material, the majority of the heat is carried by long-wavelength, long-mean-free-path phonons. Nanostructuring strategies to reduce thermal conductivity, a promising direction in the field of thermoelectrics, place scattering centers of size and spatial separation comparable to the mean free paths of the dominant phonons to selectively scatter them. The resultant thermal conductivity is in most cases well predicted using Matthiessen’s rule. In general, however, long-wavelength phonons are not as effectively scattered as the rest of the phonon spectrum. In this work, using large-scale molecular-dynamics simulations, non-equilibrium Green’s function simulations, and Monte Carlo simulations, we show that specific nanoporous geometries that create narrow constrictions in the passage of phonons lead to anticorrelated heat currents in the phonon spectrum. This effect results in super-suppression of long-wavelength phonons due to heat trapping and reductions in the thermal conductivity to values well below those predicted by Matthiessen’s rule. Full article
(This article belongs to the Special Issue Nanoscale Heat Transfer Phenomena: Ballisticity, Rectification, Collective Modes, Thermohydrodynamics, Coherence)
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11 pages, 3069 KiB  
Article
Super-Ballistic Width Dependence of Thermal Conductivity in Graphite Nanoribbons and Microribbons
by Xin Huang, Satoru Masubuchi, Kenji Watanabe, Takashi Taniguchi, Tomoki Machida and Masahiro Nomura
Nanomaterials 2023, 13(12), 1854; https://doi.org/10.3390/nano13121854 - 13 Jun 2023
Cited by 1 | Viewed by 2059
Abstract
The super-ballistic temperature dependence of thermal conductivity, facilitated by collective phonons, has been widely studied. It has been claimed to be unambiguous evidence for hydrodynamic phonon transport in solids. Alternatively, hydrodynamic thermal conduction is predicted to be as strongly dependent on the width [...] Read more.
The super-ballistic temperature dependence of thermal conductivity, facilitated by collective phonons, has been widely studied. It has been claimed to be unambiguous evidence for hydrodynamic phonon transport in solids. Alternatively, hydrodynamic thermal conduction is predicted to be as strongly dependent on the width of the structure as is fluid flow, while its direct demonstration remains an unexplored challenge. In this work, we experimentally measured thermal conductivity in several graphite ribbon structures with different widths, from 300 nm to 1.2 µm, and studied its width dependence in a wide temperature range of 10–300 K. We observed enhanced width dependence of the thermal conductivity in the hydrodynamic window of 75 K compared to that in the ballistic limit, which provides indispensable evidence for phonon hydrodynamic transport from the perspective of peculiar width dependence. This will help to find the missing piece to complete the puzzle of phonon hydrodynamics, and guide future attempts at efficient heat dissipation in advanced electronic devices. Full article
(This article belongs to the Special Issue Nanoscale Heat Transfer Phenomena: Ballisticity, Rectification, Collective Modes, Thermohydrodynamics, Coherence)
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