Article
Thermodynamics
Jialin Tang, Guotai Li, Qi Wang, Jiongzhi Zheng, Lin Cheng, Ruiqiang Guo
Summary: Layered materials with highly anisotropic thermal conductivity are important for various applications. The understanding of anisotropic thermal transport in layered materials relies on atomistic simulations, but existing methods have limitations in computational efficiency or accuracy. In this study, a machine learning interatomic potential (MLIP) within the Gaussian approximation potential (GAP) framework is introduced to accurately predict the thermal properties of layered hexagonal boron nitride (h-BN). The GAP successfully predicts the highly anisotropic phonon transport properties and thermal conductivity of bulk h-BN with reduced computational cost. The effect of four-phonon scattering on the thermal conductivity of h-BN is investigated, showing an increase in thermal conductivity reduction with temperature.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Materials Science, Multidisciplinary
Leonardo Garro Mena, Keith L. Hohn
Summary: The study investigates the catalytic activity of hexagonal boron nitride (hBN) in relation to hydroxylated sites, finding that some boric acid dehydrates on the hBN surface to produce borated hBN (hBNO). The research also demonstrates that the storage environment of samples can affect boric acid detection.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Fanghong Yang, Xiaopeng Sun, Xing Zhang, Zhanhai Yao
Summary: The study shows that by reacting h-BN with sulfonyl chloride at room temperature, active groups can be generated, which can then be used to introduce PEG through a DielsAlder reaction. This improves the dispersibility and compatibility of h-BN in epoxy resin matrix, leading to enhanced thermal conductivity of the composites.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Youzhe Yang, Jun Ma, Jie Yang, Yingyan Zhang
Summary: Graphene, hexagonal boron nitride (h-BN), and their heterostructures are considered promising thermal interface materials due to their excellent thermal properties. This study investigates the thermal conductivity of three-dimensional GBN van der Waals heterostructures through simulations and explores various techniques to modulate the thermal conductivity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Huibin Sun, Yunlei Jiang, Renjie Hua, Runhua Huang, Lei Shi, Yuan Dong, Suxia Liang, Jing Ni, Chi Zhang, Ruoyu Dong, Yingru Song
Summary: Graphene/BN heterostructures exhibit significant thermal rectification behavior, and the rectification ratio increases with the system length. This phenomenon is attributed to the mismatch of out-of-plane phonon vibration modes at the interface. This two-dimensional heterostructure shows promise for thermal management.
Review
Materials Science, Multidisciplinary
Lulu An, Yuanlie Yu, Qiran Cai, Srikanth Mateti, Lu Hua Li, Ying Ian Chen
Summary: The urgent need for ultrahigh thermally conductive materials in the electronics industry has led to the exploration of hexagonal boron nitride nano-sheets (BNNSs) as an ideal choice. This article provides a comprehensive review of various fabrication methods for BNNSs, discusses the impact of BNNS properties on their thermally conductive properties, and explores the use of BNNSs as fillers in polymer-based materials. The aim of this review is to inspire new fabrication methods and improvements for BNNS/polymer composites and promote their practical application as thermal transport/dissipation materials.
PROGRESS IN MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Chen Chen, Yang Hang, Hui Shan Wang, Yang Wang, Xiujun Wang, Chengxin Jiang, Yu Feng, Chenxi Liu, Eli Janzen, James H. Edgar, Zhipeng Wei, Wanlin Guo, Weida Hu, Zhuhua Zhang, Haomin Wang, Xiaoming Xie
Summary: The bandgap of hBN nanoribbons (BNNRs) can be changed by spatial/electrostatic confinement. Water adsorption greatly reduces the bandgap of zigzag-oriented BNNRs (zBNNRs) and can tune their conductance and optical bandgaps.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Xin Wu, Qiang Han
Summary: This study systematically investigated the phonon thermal transport across multilayer Gr/h-BN vdW heterostructures, revealing important findings on the structural configuration and external modulation at the Gr/h-BN interface. It uncovers the physical mechanisms underlying the changes in the interfacial thermal conductance (ITC) and suggests directions for its modulation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Manufacturing
Miracle Hope Adegun, Kit-Ying Chan, Jie Yang, Harun Venkatesan, Eunyoung Kim, Heng Zhang, Xi Shen, Jinglei Yang, Jang-Kyo Kim
Summary: Anisotropic boron nitride nanosheet (BNNS)/polyvinyl alcohol composite aerogels with an aligned porous structure are developed using freeze-casting technique. The optimized BNNS content in the composite aerogel exhibits an ultralow thermal conductivity of 20.3 mW/mK in the through-thickness direction, a high solar-weighted reflectance of 95.0% and a high emittance of above 93%. These exceptional thermo-optical properties make the composite aerogel promising for energy saving in buildings as superinsulating envelopes.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Igor Aharonovich, Jean-Philippe Tetienne, Milos Toth
Summary: Hexagonal boron nitride (hBN) has emerged as a fascinating platform for exploring quantum emitters and their applications. This Mini Review discusses the unique properties of hBN quantum emitters and highlights progress in their implementation in practical devices, specifically in engineering and integrating with scalable photonic resonators. It also highlights the discovery of spin defects in hBN and their potential utility for quantum sensing.
Article
Polymer Science
Li Liu, Ying Li, Xianglei Yu, Jinghong Du, Jiamin Zhang, Junpeng Li, Guoyou Gan
Summary: This study proposes a new hard-template approach for the construction of a three-dimensional hexagonal boron nitride foam (3D-BN). The 3D-BN is then filled with poly-dimethylsiloxane (PDMS) to create composites with high thermally conductivities and good insulating properties. The results show that the 3D-BN is the fundamental factor in improving the thermal conductivity of the composites.
Article
Nanoscience & Nanotechnology
Vidur Raj, Dipankar Chugh, Lachlan E. Black, M. M. Shehata, Li Li, Felipe Kremer, Daniel H. Macdonald, Hark Hoe Tan, Chennupati Jagadish
Summary: Research has shown that wafer-scale, few monolayers thick hBN as a passivation layer can significantly improve solar cell performance, with a relatively low interface defect density and potential for high-quality passivation. hBN-based passivation layers are especially useful in cases where the growth of lattice-matched passivation layers is complicated.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Review
Engineering, Manufacturing
Wentong Wu, Mingsheng Zheng, Feng Liu, Yan-Hui Song, Maochang Liu, Zhi-Min Dang
Summary: This review systematically summarizes the research progress and application of hexagonal boron nitride nanosheet (h-BNNS) as a thermally conductive filler. It provides an overview of the preparation approaches of h-BNNS, discusses the heat conduction mechanism, and elaborates on methods for improving the thermal conductivity of composites made of h-BNNS and polymers. The review also introduces the applications of these composite materials and prospects the future challenges of insulating and thermally conductive materials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Ceramics
Tsung-Pin Tasi, Chien-Te Hsieh, Hsi-Chi Yang, Kuan-Chien Liu, Yun-Rui Huang, Yasser Ashraf Gandomi, Bikash Chandra Mallick
Summary: This study investigates the thermal resistance and fire retardancy of composite thin films composed of functionalized h-BN nanosheets deposited on stainless steel foils and fabrics. The addition of h-BN nanosheets improves the thermal shielding and fire retardancy of the construction coatings, serving as an efficient thermal insulating barrier. The design of h-BN-filled coatings paves the way for preparing environmentally friendly construction materials.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Johannes E. Froech, Lesley P. Spencer, Mehran Kianinia, Daniel D. Totonjian, Minh Nguyen, Andreas Gottscholl, Vladimir Dyakonov, Milos Toth, Sejeong Kim, Igor Aharonovich
Summary: Color centers in hexagonal boron nitride (hBN) have shown efficient coupling to bullseye cavities, demonstrating a 6.5-fold enhancement in boron vacancy spin defects. Through finite-difference time-domain modeling, emission dipole orientation and enhanced contrast in optically detected magnetic resonance readout have been elucidated. This paves the way for integrating hBN spin defects with photonic resonators for a scalable spin-photon interface.
Article
Physics, Condensed Matter
Randy S. Fishman, Lucas Lindsay, Satoshi Okamoto
Summary: We calculate the orbital angular momentum (OAM) of magnons at the high symmetry points of ferromagnetic (FM) and antiferromagnetic (AF) honeycomb lattices with Dzyaloshinskii-Moriya (DM) interactions. For the FM lattice, in the absence of DM interactions, the OAM values at the corners of the Brillouin zone are alternately +/- 3h/16 for both magnon bands. The presence of DM interactions breaks this degeneracy and changes the OAM values significantly. For the AF lattice, the OAM values at the corners of the Brillouin zone depend on the anisotropy kappa and are independent of the DM interaction.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Energy & Fuels
Youcheng Jiang, Shangzhi Song, Mengjuan Mi, Lixuan Yu, Lisha Xu, Puqing Jiang, Yilin Wang
Summary: Thermal management is crucial for electronic devices, and carbon based thermal interface materials (TIMs) have gained great attention. In this study, we developed a graphene carbon nanotube composite film with improved electrical and thermal conductivities. The composite film showed enhanced properties due to the interlayer interaction and prevention of slipping between graphene layers by the added carbon nanotubes. The rGO/CNT(4:1) composite film exhibited the best performance with high electrical and in-plane thermal conductivities. This composite film has potential applications in improving heat dissipation in electronics.
Article
Chemistry, Multidisciplinary
Dezhao Huang, Qiangsheng Sun, Zeyu Liu, Shen Xu, Ronggui Yang, Yanan Yue
Summary: The authors developed a tip-enhanced Raman thermometry approach to study thermal transport at nanoscale hotspots and predicted the phonon mean free path through a combination of experiments and simulations.
Article
Materials Science, Multidisciplinary
Yu Pang, Yongheng Li, Ziyan Gao, Xin Qian, Xueyun Wang, Jiawang Hong, Puqing Jiang
Summary: In this study, the thermal conductivity of h-ErMnO3 single crystals with different vortex domain walls (DWs) was investigated using time-domain thermoreflectance (TDTR). It was found that the vortex DWs can effectively suppress the thermal conductivity along and perpendicular to the c-axis of the crystals. A phonon scattering model was used to explain the mechanism of thermal transport manipulated by the vortex DWs. These findings not only provide an essential understanding of heat transport in multiferroics with vortex DWs but also pave the way for their application in next-generation ferroelectric devices.
MATERIALS TODAY PHYSICS
(2023)
Article
Physics, Applied
Zeyu Xiang, Yu Pang, Xin Qian, Ronggui Yang
Summary: Characterizing spatially varying thermal conductivities is crucial for understanding the structure-property relation in various thermal functional materials. This study presents a machine-learning-based method for directly extracting depth-dependent thermal conductivity profiles from pump-probe phase signals. The proposed method demonstrates excellent performance in accurately reproducing different types of thermal conductivity profiles and shows potential for depth-dependent thermal property mapping.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yiteng Tu, Xinyu Tan, Guiguang Qi, Xiongbo Yang, Xiqiao Ouyang, Wensheng Yan, Weiwei Hu, Jialin Geng, Ronggui Yang
Summary: Daytime radiative cooling, a passive cooling technology, has attracted significant interest due to its zero energy consumption and zero greenhouse gas emissions. We propose a spectrally selective coating based on tri-cyclodecane dimethanol diacrylate (DCPDA) monomer, which can be fabricated with simple and scalable methods. The coated glass exhibits high transmissivity in the visible wavelengths and high thermal emissivity in the atmospheric window. Outdoor cooling tests demonstrate the sub-ambient cooling capability of the coating applied to aluminum sheets, making it a promising solution for transparent radiative cooling applications.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Yuchi Chen, Qiangqiang Huang, Te-Huan Liu, Xin Qian, Ronggui Yang
Summary: This study used molecular dynamics simulations to predict the thermopower of the redox pairs Fe(CN)6(3-)/Fe(CN)6(4-) and Fe3+/Fe2+, and found excellent agreement with experimental values. It was discovered that the thermopower of Fe3+/Fe2+ can be increased from 1.7+/-0.4 mV/K to 3.8+/-0.5 mV/K by increasing the acetone to water fraction. This increase was attributed to the intercalation of acetone molecules into the first solvation shell of Fe2+ at high acetone fractions.
Article
Thermodynamics
Qiangqiang Huang, Yuchi Chen, Xin Qian, Ronggui Yang
Summary: The utilization of low-grade heat sources has been a long-standing challenge due to the limited temperature difference. This study shows that coupling a thermally regenerative electrochemically cycled flow battery with radiative coolers can enhance the energy density and generate additional operating temperature difference. The model also captures the effects of mass transfer and electrochemical kinetics on power density and efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Chemistry, Inorganic & Nuclear
Duncan H. Moseley, Rinkle Juneja, Luke L. Daemen, Ilya Sergueev, Rene Steinbruegge, Olaf Leupold, Yongqiang Cheng, Valentino R. Cooper, Lucas Lindsay, Michelle K. Kidder, Michael E. Manley, Raphael P. Hermann
Summary: This study investigates the lattice dynamics and vibrational properties of alpha-Sb2O4 and beta-Sb2O4 compounds. It suggests that the alpha phase is more stable due to nonstoichiometric proportions of Sb-III and Sb-V.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Hongkun Li, Tribhuwan Pandey, Yi Jiang, Xiaokun Gu, Lucas Lindsay, Yee Kan Koh
Summary: In this work, the origins of anisotropic heat transport in van der Waals (vdW) materials are investigated. Experimental measurements and first-principles calculations reveal that even when the speeds of sound are roughly isotropic, the thermal conductivity of the material is lower along the c-axis compared to the in-plane axes. The main contributor to this anisotropic heat transport is found to be the anisotropy in heat capacity due to the optical phonon dispersion and frequency disparity in different directions.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hao Zhang, Yongsheng Ji, Yonggang Yao, Long Qie, Zhiheng Cheng, Zhihao Ma, Xin Qian, Ronggui Yang, Chenghang Li, Yaqing Guo, Yifei Yuan, Haoyu Xiao, Haiping Yang, Jing Ma, Jun Lu, Yunhui Huang
Summary: Battery recycling is becoming increasingly important due to the widespread use of Li-ion batteries. Direct recycling methods have advantages of high-purity material recovery and lower environmental impact, but most methods are complex and have low yield. This study presents a transient recycling approach with high efficiency for battery materials, achieving a recovery ratio of over 97% and intact metal foil of nearly 100% through shock-type or rolled-over heating.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yu Pang, Jinjin Liu, Xuanhui Fan, Haobo Yang, Jie Zhu, Zhiwei Wang, Yugui Yao, Xin Qian, Ronggui Yang
Summary: This paper reports the thermal conductivity of RbV3Sb5 and CsV3Sb5, which exhibit three-dimensional charge density wave phase transitions. The in-plane thermal conductivities are moderate at room temperature, while the cross-plane thermal conductivities are extremely low. A unique temperature dependence and peak in cross-plane thermal conductivity are observed.
Article
Thermodynamics
Qianru Jia, Yuanyuan Zhou, Xun Li, Lucas Lindsay, Li Shi
Summary: This study presents advances in the measurement of the intrinsic thermal conductivity of individual multi-walled CNT samples using a multi-probe measurement method. The sample-thermometer thermal interface resistance is directly measured and the temperature distribution along the contacted sample segment is modeled. The results reveal diffusive phonon transport in these multi-walled CNT samples and show that the measured thermal conductivity increases with temperature. Additionally, the differential electro-thermal bridge measurement method enhances the signal-to-noise ratio and reduces the measurement uncertainty.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Green & Sustainable Science & Technology
Weiping Xu, Sihong Gong, Ningsheng Wang, Wenbo Zhao, Hongle Yin, Ronggui Yang, Xiaobo Yin, Gang Tan
Summary: Radiative cooling technology, using a membrane with spectrum-selective optical properties, has been shown to effectively reduce temperatures in grain storage warehouses. Field testing in Hangzhou, China demonstrated temperature reductions of up to 9.8°C and 4°C in headspace and grain respectively. By creating a building model, it was found that significant electricity savings and temperature reductions can be achieved without the use of air conditioning.