Article
Physics, Multidisciplinary
Luyi Sun, Fangyuan Zhai, Zengqiang Cao, Xiaoyu Huang, Chunsheng Guo, Hongyan Wang, Yuxiang Ni
Summary: Anderson localization of phonons was observed in aperiodic boron nitride/carbon nanotube superlattices. The coexistence of aperiodicity and interfacial mixing was found to decrease thermal conductivity, while anharmonicity destroyed phonon localization at high temperatures. This work provides insights for designing thermoelectric materials with low thermal conductivity.
Article
Thermodynamics
Yingguang Liu, Yatao Li, Kaibo Shen, Yujun Qiu, Jing Xie
Summary: Utilizing different nanostructures can effectively control phonons transport of macrostructures, benefiting thermoelectric energy harvesting and microelectronic thermal management. This study aims to reduce the thermal conductivity of Si/Ge superlattices by embedding germanium nanoparticles (GNPs). Non-equilibrium molecular dynamics method is used to investigate the thermal transport properties of this structure. Results show that embedding NPs can significantly reduce the thermal conductivity of superlattices, but the reduction effect diminishes when the particle number exceeds half of the superlattice's periods. The effects of temperature, system length, particle size, and number on the thermal conductivity are also explored. The thermal transport properties of the system are revealed through calculations and analysis of phonons parameters such as density of states, participation ratio, mean free paths, and spectral heat flow.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Nanoscience & Nanotechnology
Prabudhya Roy Chowdhury, Jingjing Shi, Tianli Feng, Xiulin Ruan
Summary: Bismuth telluride (Bi2Te3) and its alloys with antimony telluride (Sb2Te3) are known as the best thermoelectric materials at room temperature. Recent studies have shown high thermoelectric performance in Bi2Te3-Sb2Te3 nanostructures, but computational studies on phonon transport across these nanostructures are limited.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Shiyang He, Jun Yang, Amin Bahrami, Xiang Zhang, Ran He, Martin Hantusch, Sebastian Lehmann, Kornelius Nielsch
Summary: Surface modification with Sb2O5 thin films improves the performance of thermoelectric materials by reducing thermal conductivity and increasing zT values. The deposition of just 5 cycles of Sb2O5 layer results in a significant decrease in ictot and a 12% increase in maximum zT values.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Physics, Multidisciplinary
Liu Ying-Guang, Xue Xin-Qiang, Zhang Jing-Wen, Ren Guo-Liang
Summary: This study investigates the effects of interfacial atomic mixing on thermal conductivity in Si/Ge single interface and superlattice structures through molecular dynamics simulation. The results show that mixing a few layers of atoms can enhance the thermal conductivity, but the presence of mixing interfaces significantly reduces the thermal conductivity when the system length is large, possibly due to the disruption of phonon coherent transport.
ACTA PHYSICA SINICA
(2022)
Article
Materials Science, Ceramics
Hao Zhao, Baoyin Xu, Zhanhui Ding, Yanfeng Xue, Jing Yang, Wei Zhao, Yongfeng Li, Bin Yao, Hongdong Li, Yucheng Lan
Summary: By fabricating porous structures, the thermal conductivity of Bismuth telluride was reduced, leading to improved thermoelectric properties. The study showed that porous (Bi,Sb)2Te3 materials with increased porosity and pore size had significantly lower thermal conductivity. This method of preparing porous thermoelectric materials has potential for enhancing thermoelectric performances.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
Hamid Khan, Yaseen Iqbal, Matiullah Khan, Yi Zeng
Summary: The phonon density of states and thermal conductivity of La2Zr2O7 and Gd2Zr2O7 were tuned to improve thermal insulation properties. Simulation based on density functional theory showed that doping Gd in La2Zr2O7 can modify the band structure and introduce Gd d states into the band gap, leading to changes in the phonon density of states curves. Among the simulated models, the system with a Gd/La ratio of 0.454 provided the minimum thermal conductivity.
PHYSICA B-CONDENSED MATTER
(2021)
Review
Thermodynamics
Sudhir Kumar Pathak, Rajat Kumar, Varun Goel, A. K. Pandey, V. V. Tyagi
Summary: This study summarizes the recent advancements in the thermal performance of nanofluid-charged heat pipes used for various thermal management applications. It discusses the preparation, characterization, and stability enhancement methods of nanofluids. The study found that a porous coating on the wick surface contributes to a decrease in thermal resistance, and nanofluid-charged heat pipes perform best at a filling ratio of 50-70%. The heat transfer coefficient of heat pipes increases by 20-25% with nanofluids compared to distilled water. The higher thermal conductivity and increased nucleation sites of nanofluids improve the thermal efficiency of heat pipes.
APPLIED THERMAL ENGINEERING
(2022)
Article
Physics, Applied
Georgia T. Papadakis, Christopher J. Ciccarino, Lingling Fan, Meir Orenstein, Prineha Narang, Shanhui Fan
Summary: In this study, a theory of a thermal switch based on resonant coupling of three photonic resonators is presented, utilizing the extreme tunability and low-loss resonances observed in the dielectric function of monolayer hexagonal boron nitride under controlled strain. The proposed strain-controlled h-BN-based thermal switch modulates the thermal conductance by more than an order of magnitude, achieving a contrast ratio in the thermal conductance of 98% in a deep-subwavelength nanostructure.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Physical
Anze Hubma, Franci Merzel
Summary: This article presents a new method for efficiently and accurately determining thermal conductivity in liquids. The method combines analytical solutions based on Fourier's law and nonequilibrium MD simulations to find the optimal agreement. The applicability of this method is demonstrated using liquid argon and two water models.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Thermodynamics
Mohammad Hemmat Esfe, Mousa Rejvani, Davood Toghraie
Summary: The article discusses the efficiency of nanofluids and the thermal performance factor, using Artificial Neural Networks for modeling and predicting experimental data. The results show that ANN has better agreement with experimental data in estimating data at high Reynolds numbers.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
O. Farzadian, F. Yousefi, C. Spitas, K. Kostas
Summary: In this study, non-equilibrium molecular dynamics simulations were used to investigate phonon heat transport in a two-dimensional superlattice with equal-sized domains of graphene and phagraphene. It was found that the minimum thermal conductivity occurred at a superlattice period of 12.85 nm for ribbons, with a value of 155 W/mK. The minimum thermal conductivity of graphene-phagraphene superlattices is approximately 5% of pure graphene thermal conductivity and 50% of phagraphene thermal conductivity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Sarah Salloum, Georg Bendt, Markus Heidelmann, Kateryna Loza, Samaneh Bayesteh, M. Sepideh Izadi, Patrick Kawulok, Ran He, Heike Schlorb, Nicolas Perez, Heiko Reith, Kornelius Nielsch, Gabi Schierning, Stephan Schulz
Summary: The phase-pure ternary solutions of tetradymite-type materials (BixSb1-x)(2)Te-3 (x=0.25; 0.50; 0.75) were successfully synthesized using an ionic liquid approach. The nanoparticles were characterized by various techniques, and the impact of different processing methods on the thermoelectric properties was demonstrated, showing significant differences in Seebeck coefficient, electrical and thermal conductivity.
Article
Materials Science, Multidisciplinary
S. Pailhes, V. M. Giordano, S. R. Turner, P. -F Lory, C. Candolfi, M. de Boissieu, H. Euchner
Summary: Exploiting the structural complexity of crystals at the scale of their unit cell is a well-established strategy in the search for efficient materials for energy conversion. The discovery of clathrates with exceptionally low lattice thermal conductivity but essentially unaffected and tunable electronic properties has revealed the potential of this strategy. The thermal conductivity of clathrates behaves similarly to glasses, but its origin is fundamentally different.
RESULTS IN PHYSICS
(2023)
Article
Multidisciplinary Sciences
Liujun Xu, Jinrong Liu, Guoqiang Xu, Jiping Huang, Cheng- Wei Qiu
Summary: In an active thermal lattice composed of a stationary solid matrix and rotating solid particles, giant thermal chirality is generated by breaking the Onsager reciprocity relation through rotation, which is about two orders of magnitude larger than ever reported. Anisotropic thermal chirality is achieved by breaking the rotation invariance of the active lattice, bringing effective thermal conductivity to a region unreachable by the thermal Hall effect.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Thermodynamics
Jihoon Jeong, Ke Chen, Emily S. Walker, Nilabh Roy, Feng He, Philip Liu, C. Grant Willson, Michael Cullinan, Seth R. Bank, Yaguo Wang
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2018)
Article
Materials Science, Multidisciplinary
Wenzhi Wu, Zhijun Chai, Yachen Gao, Degui Kong, Feng He, Xianghai Meng, Yaguo Wang
OPTICAL MATERIALS EXPRESS
(2017)
Article
Multidisciplinary Sciences
Xiaochuan Xu, Xiaorui Zheng, Feng He, Zheng Wang, Harish Subbaraman, Yaguo Wang, Baohua Jia, Ray T. Chen
SCIENTIFIC REPORTS
(2017)
Article
Optics
Shen Qu, Mao-Bin Hu, Yaguo Wang, Tingjie Song
OPTICS COMMUNICATIONS
(2018)
Article
Materials Science, Multidisciplinary
Xianghai Meng, Yongjian Zhou, Ke Chen, Richard H. Roberts, Wenzhi Wu, Jung-Fu Lin, Ray T. Chen, Xiaochuan Xu, Yaguo Wang
ADVANCED OPTICAL MATERIALS
(2018)
Article
Nanoscience & Nanotechnology
Ke Chen, Anupam Roy, Amritesh Rai, Hema C. P. Movva, Xianghai Meng, Feng He, Sanjay K. Banerjee, Yaguo Wang
Article
Thermodynamics
Ke Chen, Xianghai Meng, Feng He, Yongjian Zhou, Jihoon Jeong, Nathanial Sheehan, Seth R. Bank, Yaguo Wang
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2018)
Article
Thermodynamics
Jihoon Jeong, Xianghai Meng, Ann Kathryn Rockwell, Seth R. Bank, Wen-Pin Hsieh, Jung-Fu Lin, Yaguo Wang
NANOSCALE AND MICROSCALE THERMOPHYSICAL ENGINEERING
(2019)
Article
Physics, Multidisciplinary
Xianghai Meng, Tribhuwan Pandey, Jihoon Jeong, Suyu Fu, Jing Yang, Ke Chen, Akash Singh, Feng He, Xiaochuan Xu, Jianshi Zhou, Wen-Pin Hsieh, Abhishek K. Singh, Jung-Fu Lin, Yaguo Wang
PHYSICAL REVIEW LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Xianghai Meng, Akash Singh, Rinkle Juneja, Yanyao Zhang, Fei Tian, Zhifeng Ren, Abhishek K. Singh, Li Shi, Jung-Fu Lin, Yaguo Wang
ADVANCED MATERIALS
(2020)
Article
Physics, Applied
Feng He, Emily S. Walker, Yongjian Zhou, Raul D. Montano, Seth R. Bank, Yaguo Wang
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Applied
Yongjian Zhou, Wen-Pin Hsieh, Chao-Chih Chen, Xianghai Meng, Fei Tian, Zhifeng Ren, Li Shi, Jung-Fu Lin, Yaguo Wang
Summary: In this study, we observed a non-monotonic dependence of thermal conductivity on pressure in boron arsenide, which is a result of several competing effects, including defect-phonon scattering and modification of structural defects under high pressure.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Manufacturing
Nilabh K. Roy, Obehi G. Dibua, William Jou, Feng He, Jihoon Jeong, Yaguo Wang, Michael A. Cullinan
JOURNAL OF MICRO AND NANO-MANUFACTURING
(2018)
Article
Nanoscience & Nanotechnology
Ke Chen, Rudresh Ghosh, Xianghai Meng, Anupam Roy, Joon-Seok Kim, Feng He, Sarah C. Mason, Xiaochuan Xu, Jung-Fu Lin, Deji Akinwande, Sanjay K. Banerjee, Yaguo Wang
NPJ 2D MATERIALS AND APPLICATIONS
(2017)
Article
Nanoscience & Nanotechnology
Ke Chen, Anupam Roy, Amritesh Rai, Amithraj Valsaraj, Xianghai Meng, Feng He, Xiaochuan Xu, Leonard F. Register, Sanjay Banerjee, Yaguo Wang
ACS APPLIED MATERIALS & INTERFACES
(2018)
