Article
Nanoscience & Nanotechnology
Zhengfang Wang, Zijian Wu, Najla AlMasoud, Ling Weng, Taghrid S. Alomar, Zeinhom M. El-Bahy, Mingpeng He, Changjie Yang, Mingqi Sun, Priyanka Wasnik, Handong Li, Hassan Algadi, Sri Hari Kumar Annamareddy, Deepak Sridhar
Summary: Establishing a synergistic thermal conductivity network with multi-walled carbon nanotubes (MWCNT) and alumina (Al2O3) and a continuous hexagonal boron nitride (h-BN) thermal conductivity network significantly improved the thermal conductivity (lambda) of the composite. The composite, with MWCNT content of 0.5 wt%, Al2O3 content of 0.5 wt%, and h-BN content of 30 wt%, achieved a lambda of 3.36 W/mK. Additionally, the composite exhibited good insulation properties, with a conductivity value of only 3.21 x 10(-9) S/cm at an h-BN content of 30 wt% and MWCNT content of 0.5 wt%. This composite has potential applications in electronic packaging.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Satoru Konabe
Summary: This study investigates the exciton effect on the shift current in single-walled boron-nitride nanotubes using effective mass theory combined with the Bethe-Salpeter equation. The findings indicate that the shift current is enhanced by the exciton effect compared to free electron-hole pairs, and that the direction of the shift current is determined by the chiral index of the nanotube even in the presence of excitons. A simple explanation is provided on why the chiral index determines the direction of the shift current from a bond structure viewpoint via the Rice-Mele model.
Article
Chemistry, Multidisciplinary
Zhiliang Pan, Yi Tao, Yang Zhao, Matthew L. Fitzgerald, James R. McBride, Lei Zhu, Deyu Li
Summary: The contact thermal resistance between individual boron nitride nanotubes is largely determined by reflection of ballistic phonons, but can be influenced by the presence of a poly(vinylpyrrolidone) interlayer. The interlayer can either enhance or reduce the contact thermal resistance by converting the transport mechanism from ballistic phonon dominated to diffusion through the interlayer. This study provides insights into the design of high thermal conductivity boron nitride nanotube-polymer composites.
Article
Chemistry, Multidisciplinary
Yusuke Nakanishi, Shinpei Furusawa, Yuta Sato, Takumi Tanaka, Yohei Yomogida, Kazuhiro Yanagi, Wenjin Zhang, Hiroshi Nakajo, Soma Aoki, Toshiaki Kato, Kazu Suenaga, Yasumitsu Miyata
Summary: The structural diversity and chemical variations of single-walled transition metal dichalcogenide nanotubes templated by boron nitride nanotubes are reported. This template reaction provides a universal platform for studying the chirality-dependent properties of one-dimensional nanotubes with different electronic structures.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Zhenzhen Ou, Feng Gao, Lingjian Zhu, Huaijun Zhao, Zihan Xun
Summary: An electric-insulated heat-conducted material with specific properties has been studied and its practicality has been proven through experiments. By optimizing the filler fraction and working conditions, the best ratio has been determined for high voltage power encapsulation.
Article
Nanoscience & Nanotechnology
Maryam Zarghami Dehaghani, Omid Farzadian, Konstantinos Kostas, Fatemeh Molaei, Christos Spitas, Amin Hamed Mashhadzadeh
Summary: Controlling thermal conductivity of nanostructures is crucial for tailor-made nanodevices. This study focuses on modeling biphenylene/hexagonal Boron-Nitride (biphenylene/h-BN) superlattice nanoribbons and investigates the effects of length and superlattice period on thermal conductivity. The results show that the superlattice nanostructure has significantly lower thermal conductivity compared to pristine h-BN and biphenylene nanosheets, offering potential applications in thermoelectric and thermal insulation materials.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Physical
Xiao Zhang, Wei Tan, Tian Carey, Bo Wen, Delong He, Adrees Arbab, Alex Groombridge, Fiona Smail, Jean de La Verpilliere, Chengning Yao, Yanchun Wang, Xiaojun Wei, Huaping Liu, Sishen Xie, Felice Torrisi, Michael De Volder, Weiya Zhou, Adam Boies
Summary: This study focuses on the in-situ construction of CNT-based 3D heat conduction networks with different directional performances to enhance the thermal conductivity of polymer composites. By using confined-growth techniques and aligned hBN, the composites with isotropic and anisotropic thermal conductivity were successfully achieved.
Article
Chemistry, Multidisciplinary
Jing Wang, Haihong Ma, Fengmei Ren, Zhengfa Zhou, Weibing Xu
Summary: Heat dissipation has become a key problem for highly integrated and miniaturized electronic components. In this study, a new strategy for preparing electronic potting materials with high thermal conductivity, good flowability and low coefficient of linear thermal expansion (CLTE) was presented by modifying the surface of spherical alumina and preparing a high alumina loading precursor of silicone potting adhesive.
Article
Engineering, Multidisciplinary
Wang Yang, Yifan Wang, Yun Li, Can Gao, Xiaojuan Tian, Ni Wu, Zishuo Geng, Sai Che, Fan Yang, Yongfeng Li
Summary: By coating boron nitride nanosheets and carbon nanotubes on a commercial polyurethane foam skeleton, a three-dimensional network structure composite with enhanced thermal and mechanical properties was constructed for potential application in electronic packaging.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Manufacturing
Jianwei Zhou, Zhongxun Yu, Yarong Lv, Ce Wang, Ping Hu, Yong Liu
Summary: This study proposes a novel strategy to construct thermally conductive networks using boron nitride nanosheets-multiwalled carbon nanotubes/poly(vinyl alcohol) nanocomposites. The resulting nanocomposites exhibit excellent in-plane thermal conductivity and heat dissipation capacity, providing inspiration for the preparation of composites with high thermal conductivity.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Physical
Nataliya A. Sakharova, Jorge M. Antunes, Andre F. G. Pereira, Bruno M. Chaparro, Jose Fernandes
Summary: This study investigated the elastic properties of chiral and non-chiral single-walled boron nitride nanotubes across a wide range of chiral indices and diameters using a three-dimensional finite element model. The impact of input parameters on numerical simulation results was extensively explored, and the elastic properties of single-walled boron nitride nanotubes were compared with those of single-walled carbon nanotubes.
Article
Chemistry, Multidisciplinary
Jun Yang, Zhijie Chen, Longyi Liang, Zhiwen Guan, Junwen Ren
Summary: This study reports on epoxy composites enhanced by ternary fillers of boron nitride nanosheets (BNNSs), multiwalled carbon nanotubes (MWCNTs), and silica (SiO2) nanoparticles. The obtained composites exhibit high thermal conductivity, improved mechanical strength, and low dielectric properties, providing guidance for optimizing the design of high-performance materials.
Article
Engineering, Manufacturing
Li Fan, Shuai Zhang, Guojie Zhao, Qiang Fu
Summary: A novel fibrillated hybrid skeleton (f-AO@BNNS skeleton) was prepared to enhance the thermal conductivity of polymer-based electronic packaging materials, achieving a high thermal conductivity composite through long-range phonon transferring highway with macroscopically interconnected fiber and microscopically oriented BNNSs.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Taoqing Huang, Fubao Yang, Tian Wang, Jun Wang, Yongwei Li, Jiping Huang, Min Chen, Limin Wu
Summary: This study presents a novel design strategy to enhance the performance of thermal interface materials by improving the filler assembly structure. The flexible composite film with ladder-structured boron nitride nanosheet (BNNS) skeleton structure exhibits high thermal conductivity and electrical insulation.
APPLIED MATERIALS TODAY
(2022)
Article
Energy & Fuels
Shuying Wu, Qiyan Chen, Dandan Chen, Deqi Peng, Ying Ma
Summary: Dispersion of hexagonal boron nitride nanosheets into phase change materials can significantly enhance the thermal conductivity of composites. Increasing the layer number and size of h-BN can effectively improve the thermal conductivity of the composites.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Multidisciplinary
Yixuan Xue, Jin-Wu Jiang
Summary: Kapitza resistance is crucial for the thermal stability of the interface between the ceramic top coat and the thermal growth oxide layer in thermal barrier coating structure. Results show that changes in chemical bonds induced by pressure can reduce Kapitza resistance.
ACTA MECHANICA SOLIDA SINICA
(2022)
Article
Materials Science, Multidisciplinary
Fangyan Zhu, Jiantao Leng, Jin-Wu Jiang, Tienchong Chang, Tongyi Zhang, Huajian Gao
Summary: This article develops a unified theoretical framework for tangential entropic forces (TEFs) in low-dimensional materials and provides explicit analytical solutions as well as machine learning approximation solutions. This concept could serve as one of the founding pillars of nanomechanics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Thermodynamics
Yong-Mei Zhang, Mauro Antezza, Jian-Sheng Wang
Summary: The presence of interlayer interactions in twisted bilayer graphene (TBG) enhances several characteristics, including the optical and electronic properties. A series of double magic angles have been theoretically investigated in TBG. The thermal radiation from TBG can be tuned to the far infrared range by changing twist angles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Applied
Li-Kai Wan, Yi-Xuan Xue, Jin-Wu Jiang, Harold S. S. Park
Summary: Lateral heterostructures of graphene/hexagonal boron nitride exhibit unique electronic and optical properties, and the mechanical properties of the interface play a crucial role in their stability. Through molecular dynamics simulations and machine learning, a study on the fracture properties of the interface in these heterostructures was conducted. It was found that the shape of the interface significantly affects the fracture stress and strain, and a machine learning model was able to identify the strongest interfaces. The findings also revealed the importance of interface roughness and chemical bond strength in determining interface strength, and the correlation between fracture properties and thermal conductivity.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Hangbo Zhou, Gang Zhang, Jian-Sheng Wang, Yong-Wei Zhang
Summary: We investigate the anharmonic phonon scattering across a weakly interacting interface and find that the contribution from anharmonic three-phonon scatterings can be described by a temperature-dependent Landauer formula. Surprisingly, in the weak coupling limit, the transmission due to anharmonic phonon scattering increases indefinitely with temperature, which is not the case for two-phonon processes. We further reveal that anharmonic effects dominate over harmonic processes even at room temperature in real heterogeneous interfaces, emphasizing the importance of anharmonicity in weakly interacting systems.
Article
Chemistry, Physical
Chuan-Xin Cui, Jin-Wu Jiang
Summary: In this study, the mechanical properties of different phases of CsPbI3 under finite deformation were investigated using reactive molecular dynamics simulations. Anisotropy in Young's modulus and Poisson's ratio was observed in the linear elastic region. The orthorhombic phase showed lower hardness and higher flexibility compared to the tetragonal and cubic phases, leading to higher susceptibility to stress. The average atomic charge decreased with increasing strain and concentrated at cracks during fracture progression. Additionally, negative Poisson's ratio was found in the xz-direction during finite deformation of the tetragonal and orthorhombic phases, which could be explained by the Pb-I-Pb angle perpendicular to the xy-plane. These findings provide valuable insights into the mechanical behavior and fracture characteristics of CsPbI3 perovskite, with implications for designing perovskite-based devices for various applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Zhao-Xia Qu, Bing-Shen Wang, Jin-Wu Jiang
Summary: The ideal gas law fails to describe the structural parameters of graphene bubbles due to the extremely high pressure inside. To address this issue, an improved van der Waals equation with a quadratic nonlinear term of gas density is proposed, providing an accurate description for the shape of graphene and MoS2 bubbles, as confirmed by molecular dynamics simulations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Physics, Multidisciplinary
Jian-Sheng Wang, Jiebin Peng, Zu-Quan Zhang, Yong-Mei Zhang, Tao Zhu
Summary: This article discusses the description and modeling of transport phenomena in electron systems coupled via scalar or vector photons. It is divided into three parts: scalar photons (Coulomb interactions), transverse photons (described by vector potentials), and the phi = 0 or temporal gauge, which is a complete theory of electrodynamics. The nonequilibrium Green's function (NEGF) formalism is used as a tool to study steady-state transport, with the advantage of going beyond fluctuational electrodynamics (FE) due to its generality. Several examples are provided, including heat transfer between graphene sheets, light emission from a double quantum dot, and emission of energy, momentum, and angular momentum from a graphene nanoribbon. All calculations are based on a generalization of the Meir-Wingreen formula, with materials properties represented by photon self-energy and coupled with the Keldysh equation and the solution to the Dyson equation.
FRONTIERS OF PHYSICS
(2023)
Article
Thermodynamics
Yixuan Xue, Harold S. Park, Jin-Wu Jiang
Summary: In this study, we demonstrate that the interfacial thermal resistance in graphene/fullerene/graphene sandwiches can be switchable and show a step-like change by varying the number of fullerenes. This switchable phenomenon is achieved by a structural transition between the graphene layers. The study also shows that mechanical strain or temperature variation can achieve the same switchable effect. This work highlights the potential application of sandwich-like nanoscale heterostructures in switchable thermal devices.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Yixuan Xue, Jin-Wu Jiang, Harold S. Park
Summary: Fullerene-based sandwiches with controllable physical properties offer new possibilities for advancing thermoelectricity. This study investigates the structural transformations of the sandwich structure and reveals the critical area ratios at which the fullerene pattern changes from circular to rectangular and the graphene layers become separated. These findings provide important insights into the mechanisms driving fullerene-based sandwich transformation, facilitating the design of future electronic and energy storage applications.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Thermodynamics
Zhao-Xia Qu, Jin-Wu Jiang
Summary: This study derives an analytic formula for the effect of bubbles on the length variation of the MoS2 layer in van der Waals layered structures. It is found that the nonlinear plate theory with the generalized van der Waals equation provides the most accurate description for the bubble effect. The analytic formula shows that bubbles can cause strong thermal contraction for few-layer MoS2 with increasing temperature, which is verified by molecular dynamic simulations.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Multidisciplinary Sciences
Yang Chen, Fangyan Zhu, Jiantao Leng, Tianquan Ying, Jin- Wu Jiang, Quan Zhou, Tienchong Chang, Wanlin Guo, Huajian Gao
Summary: This study reports a mechanism capable of controllably driving directed motion of any nanoo-bjects in both solid and liquid forms. The driving force originates from the difference in atomic fluctuations of the substrate behind and ahead of the object, and it can be flexibly tuned based on the amplitude and frequency of the substrate.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Physical
Yu Li, Jin-Wu Jiang
Summary: Single-walled carbon nanotubes (SWCNTs) have high thermal conductivity, benefiting their use in high-performance electronic devices. The buckling stability of SWCNTs is improved by fullerene encapsulation, which also affects the thermal conductivity. We conducted molecular dynamics simulations to study the effect of fullerene encapsulation on thermal conductivity and found that vacancy defects weaken the coupling strength between the nanotube shell and the fullerene. This effect is more significant for narrower SWCNTs than for thicker ones.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Yu Li, Jin-Wu Jiang
Summary: This study investigates the mechanisms of structural transitions in carbon peapods and the effects of vacancy defects, using machine-learned potentials. The developed potentials accurately reproduce experimental carbon structures and provide insights into the development of novel carbon allotropes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Zhao-Xia Qu, Jin-Wu Jiang
Summary: The presence of bubbles has a considerable impact on reducing the interfacial thermal conductance of van der Waals layered structures, with nanobubbles potentially resulting in a reduction of up to 53%.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
