April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
Symposium Supporters
2024 MRS Spring Meeting
EN07.06.01

Phonon Transport of Disordered Materials with Nanostructures

When and Where

Apr 24, 2024
8:45am - 9:15am
Room 327, Level 3, Summit

Presenter(s)

Co-Author(s)

Junichiro Shiomi1

The University of Tokyo1

Abstract

Junichiro Shiomi1

The University of Tokyo1
Phonon engineering of crystalline materials by nanostructures has made great progress in the past decades, and the next non-trivial challenge is how to engineer phonons in disordered materials. We have studied nanostructured amorphous materials such as amorphous superlattices [1] and amorphous phononic crystals (amorphous thin films with holes) [2]. There, by applying the Allen-Feldmann theory, which divided heat carrier into propagons, diffusons, and locons, we found that not only the transport of propagons but also that of diffusons is effectively hindered by the nanostructure interfaces. To gain further direct insight, inelastic x-ray scattering was performed. Partially disordered materials are also of great interest from an academic and industrial point of view. This includes materials consisting of crystalline and amorphous portions, e.g., polycrystals with disordered interfaces. Disordered grain boundaries have been found experimentally to selectively inhibit phonon transport rather than electron transport. Furthermore, a black box model of disordered silicon grain boundaries was successfully performed, revealing that the main structural factors that determine transport are different for phonons and electrons [3]. Crystalline materials with distorted lattices, such as cellulose nanofibers, are also interesting. The thermal conductivity of cellulose nanofibers was found to be greatly enhanced by controlling the arrangement of the constituent cellulose nanofibrils and the hydrogen bonds between the fibrils [4].<br/><br/>[1] Y. Liao, S. Iwamoto, M. Sasaki, M. Goto, J. Shiomi, Nano Energy 84, 105903 (2021).<br/>[2] N. Tambo, Y. Liao, C. Zhou, E. M. Ashley, K. Takahashi, P. F. Nealey, Y. Naito, J. Shiomi, Science Advances 6, eabc0075 (2022).<br/>[3] C. Lortaraprasert, J. Shiomi, npj Computational Materials 8, 219 (2022).<br/>[4] G. Wang, M. Kudo, K. Daicho, S. Harish, B. Xu, C. Shao, Y. Lee, Y. Liao, N. Matsushima, T. Kodama, F. Lundell, L. D. Sooderberg, T. Saito, J. Shiomi, Nano Letters 23, 1144-1151 (2023).

Keywords

thermal conductivity

Symposium Organizers

Woochul Kim, Yonsei University
Sheng Shen, Carnegie Mellon University
Sunmi Shin, National University of Singapore
Sebastian Volz, The University of Tokyo

Session Chairs

Yee Kan Koh
Jaeyun Moon

In this Session