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Li H, Zhu Y, Chu M, Dong H, Zhang G. Thermal conductivity of irregularly shaped nanoparticles from equilibrium molecular dynamics. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2024; 36:345703. [PMID: 38684162 DOI: 10.1088/1361-648x/ad44f9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
The computation of thermal conductivity for finite nanoparticulate systems, particularly those of irregular shapes, poses significant challenges. The nonequilibrium molecular dynamics (NEMD) methods has been extensively utilized in numerous prior studies for the computation of thermal conductivity of nanoparticles. One of our recent works (Donget al2021Phys. Rev.B103035417) proposed that equilibrium molecular dynamics (EMD) methods can be used for the simulation of thermal conductivity of finite-scale systems and demonstrated their equivalence to NEMD methods. In this study, we investigated the application of the (EMD) approach for the computation of thermal conductivity in zero-dimensional nanoparticles. In our initial step, we merged both methodologies to substantiate the equivalence in thermal conductivity calculation for cube and cylinder nanoparticles. After filtering the data, we confirmed the usefulness of EMD for evaluating the thermal conductivity of zero-dimensional materials. The NEMD method faces challenges in accurately predicting thermal conductivity in nanoparticle systems with a varying cross-sectional area along the transport direction, whereas EMD methods can be utilized to estimate thermal conductivity when the volume is known. In a subsequent study, we used the state-of-the-art machine learning potential to calculate the thermal conductivity of spherical nanoparticles and compared the results with those obtained using the classical Tersoff potential. Ultimately, we predicted the thermal conductivity of nanoparticles with various geometries in all directions. Our findings collectively demonstrate the simplicity and effectiveness of employing EMD methods for calculating thermal conductivity in nanoparticle systems, thereby opening up new avenues for investigating thermal transport properties in particle systems as well as nanopders.
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Affiliation(s)
- Hongfei Li
- Department of Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - Yuanxu Zhu
- Department of Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
| | - MengFan Chu
- College of Miami, Henan University, Kaifeng 475004, People's Republic of China
| | - Haikuan Dong
- College of Physical Science and Technology, Bohai University, Jinzhou 121013, People's Republic of China
| | - Guohua Zhang
- Department of Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
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Tian H, Yao Z, Li Z, Guo J, Liu L. Unlocking More Potentials in Two-Dimensional Space: Disorder Engineering in Two-Dimensional Amorphous Carbon. ACS NANO 2023; 17:24468-24478. [PMID: 38015075 DOI: 10.1021/acsnano.3c09593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
The theory of the nature of glass has been described as the deepest but unsolved problem in solid state theory. The fundamental understanding of the structural characteristics of glassy materials and disorder-property correspondence remains incomplete due to difficulties in fully characterizing disordered structures in three-dimensional materials. Recently, two-dimensional amorphous materials were treated as an atomic-level playground to uncover previously unknown structure-property relationships in vitreous materials. Here, we summarize recent research on one prototypical material, two-dimensional amorphous carbon, including atomic structural characterizations, controllable synthesis, exotic properties, and application potentials. Fundamental discrepancies only induced by the amorphous nature, when compared with crystalline materials, will be highlighted. Finally, we discuss the restricted definition of two-dimensional amorphous carbon, existing challenges, and future research directions.
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Affiliation(s)
- Huifeng Tian
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Zhixin Yao
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China
| | - Zhenjiang Li
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Junjie Guo
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China
| | - Lei Liu
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
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Fan Z, Wang Y, Ying P, Song K, Wang J, Wang Y, Zeng Z, Xu K, Lindgren E, Rahm JM, Gabourie AJ, Liu J, Dong H, Wu J, Chen Y, Zhong Z, Sun J, Erhart P, Su Y, Ala-Nissila T. GPUMD: A package for constructing accurate machine-learned potentials and performing highly efficient atomistic simulations. J Chem Phys 2022; 157:114801. [DOI: 10.1063/5.0106617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present our latest advancements of machine-learned potentials (MLPs) based on the neuroevolution potential (NEP) framework introduced in [Fan et al., Phys. Rev. B 104, 104309 (2021)] and their implementation in the open-source package GPUMD.We increase the accuracy of NEP models both by improving the radial functions in the atomic-environment descriptor using a linear combination of Chebyshev basis functions and by extending the angular descriptor with some four-body and five-body contributions as in the atomic cluster expansion approach.We also detail our efficient implementation of the NEP approach in graphics processing units as well as our workflow for the construction of NEP models, and we demonstrate their application in large-scale atomistic simulations.By comparing to state-of-the-art MLPs, we show that the NEP approach not only achieves above-average accuracy but also is far more computationally efficient.These results demonstrate that the GPUMD package is a promising tool for solving challenging problems requiring highly accurate, large-scale atomistic simulations.To enable the construction of MLPs using a minimal training set, we propose an active-learning scheme based on the latent space of a pre-trained NEP model.Finally, we introduce three separate Python packages, GPYUMD, CALORINE, and PYNEP, which enable the integration of GPUMD into Python workflows.
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Affiliation(s)
- Zheyong Fan
- School of Mathematics and Physics, Bohai University, China
| | | | - Penghua Ying
- School of Science, Harbin Institute of Technology Shenzhen, China
| | - Keke Song
- University of Science and Technology Beijing, China
| | | | | | | | - Ke Xu
- Xiamen University, Xiamen University, China
| | | | | | | | - Jiahui Liu
- University of Science and Technology Beijing, China
| | | | - Jianyang Wu
- Department of Physics, Xiamen University, China
| | - Yue Chen
- Mechanical Engineering, University of Hong Kong Department of Mechanical Engineering, Hong Kong
| | - Zheng Zhong
- Harbin Institute of Technology, Shenzhen, Harbin Institute of Technology, China
| | - Jian Sun
- Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, China
| | | | - Yanjing Su
- Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, China
| | - Tapio Ala-Nissila
- Department of Applied Physics, Aalto University Department of Applied Physics, Finland
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Salvalaglio M, Voigt A, Huang ZF, Elder KR. Mesoscale Defect Motion in Binary Systems: Effects of Compositional Strain and Cottrell Atmospheres. PHYSICAL REVIEW LETTERS 2021; 126:185502. [PMID: 34018767 DOI: 10.1103/physrevlett.126.185502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 06/12/2023]
Abstract
The velocity of dislocations is derived analytically to incorporate and predict the intriguing effects induced by the preferential solute segregation and Cottrell atmospheres in both two-dimensional and three-dimensional binary systems of various crystalline symmetries. The corresponding mesoscopic description of defect dynamics is constructed through the amplitude formulation of the phase-field crystal model, which has been shown to accurately capture elasticity and plasticity in a wide variety of systems. Modifications of the Peach-Koehler force as a result of solute concentration variations and compositional stresses are presented, leading to interesting new predictions of defect motion due to effects of Cottrell atmospheres. These include the deflection of dislocation glide paths, the variation of climb speed and direction, and the change or prevention of defect annihilation, all of which play an important role in determining the fundamental behaviors of complex defect network and dynamics. The analytic results are verified by numerical simulations.
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Affiliation(s)
- Marco Salvalaglio
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
- Dresden Center for Computational Materials Science, TU Dresden, 01062 Dresden, Germany
| | - Axel Voigt
- Institute of Scientific Computing, TU Dresden, 01062 Dresden, Germany
- Dresden Center for Computational Materials Science, TU Dresden, 01062 Dresden, Germany
| | - Zhi-Feng Huang
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA
| | - Ken R Elder
- Department of Physics, Oakland University, Rochester, Michigan 48309, USA
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Shi L, Ma X, Li M, Zhong Y, Yang L, Yin W, He X. Molecular dynamics simulation of phonon thermal transport in nanotwinned diamond with a new optimized Tersoff potential. Phys Chem Chem Phys 2021; 23:8336-8343. [PMID: 33875998 DOI: 10.1039/d1cp00399b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The inaccuracy of the most widely used potentials in calculating the phonon transport of sp3 carbon materials hinders the use of molecular dynamics simulations for revealing the underlying mechanism of phonon transport in diamond and related materials. Here, we introduce an optimized Tersoff potential by optimizing the parameters to fit the experimentally determined phonon dispersion in diamond along the high-symmetry directions. Molecular dynamics simulations are performed using this new potential to investigate the phonon thermal transport in flawless and nanotwinned diamond. The simulation results show that while the phonon lifetimes of nanotwinned diamond are slightly lower than those of the flawless one, the phonon group velocities of nanotwinned diamond are obviously lower than those of diamond. The present results indicate that the twin boundaries in diamond are ineffective in scattering the phonons and the lower thermal conductivity of the nanotwinned diamond mainly originates from the lower group velocities due to its reduced structural rigidity.
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Affiliation(s)
- Liping Shi
- Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150080, China.
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Archer AJ, Ratliff DJ, Rucklidge AM, Subramanian P. Deriving phase field crystal theory from dynamical density functional theory: Consequences of the approximations. Phys Rev E 2019; 100:022140. [PMID: 31574721 DOI: 10.1103/physreve.100.022140] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Indexed: 06/10/2023]
Abstract
Phase field crystal (PFC) theory is extensively used for modeling the phase behavior, structure, thermodynamics, and other related properties of solids. PFC theory can be derived from dynamical density functional theory (DDFT) via a sequence of approximations. Here, we carefully identify all of these approximations and explain the consequences of each. One approximation that is made in standard derivations is to neglect a term of form ∇·[n∇Ln], where n is the scaled density profile and L is a linear operator. We show that this term makes a significant contribution to the stability of the crystal, and that dropping this term from the theory forces another approximation, that of replacing the logarithmic term from the ideal gas contribution to the free energy with its truncated Taylor expansion, to yield a polynomial in n. However, the consequences of doing this are (i) the presence of an additional spinodal in the phase diagram, so the liquid is predicted first to freeze and then to melt again as the density is increased; and (ii) other periodic structures, such as stripes, are erroneously predicted to be thermodynamic equilibrium structures. In general, L consists of a nonlocal convolution involving the pair direct correlation function. A second approximation sometimes made in deriving PFC theory is to replace L with a gradient expansion involving derivatives. We show that this leads to the possibility of the density going to zero, with its logarithm going to -∞ while being balanced by the fourth derivative of the density going to +∞. This subtle singularity leads to solutions failing to exist above a certain value of the average density. We illustrate all of these conclusions with results for a particularly simple model two-dimensional fluid, the generalized exponential model of index 4 (GEM-4), chosen because a DDFT is known to be accurate for this model. The consequences of the subsequent PFC approximations can then be examined. These include the phase diagram being both qualitatively incorrect, in that it has a stripe phase, and quantitatively incorrect (by orders of magnitude) regarding the properties of the crystal phase. Thus, although PFC models are very successful as phenomenological models of crystallization, we find it impossible to derive the PFC as a theory for the (scaled) density distribution when starting from an accurate DDFT, without introducing spurious artifacts. However, we find that making a simple one-mode approximation for the logarithm of the density distribution lnρ(x) rather than for ρ(x) is surprisingly accurate. This approach gives a tantalizing hint that accurate PFC-type theories may instead be derived as theories for the field lnρ(x), rather than for the density profile itself.
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Affiliation(s)
- Andrew J Archer
- Department of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Daniel J Ratliff
- Department of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | | | - Priya Subramanian
- School of Mathematics, University of Leeds, Leeds LS2 9JT, United Kingdom
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Dong H, Hirvonen P, Fan Z, Ala-Nissila T. Heat transport in pristine and polycrystalline single-layer hexagonal boron nitride. Phys Chem Chem Phys 2018; 20:24602-24612. [DOI: 10.1039/c8cp05159c] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unusual thermal transport in polycrystalline h-BN prepared by phase field crystal model is revealed by large-scale molecular dynamics simulations.
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Affiliation(s)
- Haikuan Dong
- School of Mathematics and Physics
- Bohai University
- Jinzhou 121000
- China
| | - Petri Hirvonen
- QTF Centre of Excellence
- Department of Applied Physics
- Aalto University
- FI-00076 Aalto
- Finland
| | - Zheyong Fan
- School of Mathematics and Physics
- Bohai University
- Jinzhou 121000
- China
- QTF Centre of Excellence
| | - Tapio Ala-Nissila
- QTF Centre of Excellence
- Department of Applied Physics
- Aalto University
- FI-00076 Aalto
- Finland
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