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Mukut KM, Ganguly A, Goudeli E, Kelesidis GA, Roy SP. Internal Structure of Incipient Soot from Acetylene Pyrolysis Obtained via Molecular Dynamics Simulations. J Phys Chem A 2024; 128:5175-5187. [PMID: 38961739 DOI: 10.1021/acs.jpca.4c01548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2024]
Abstract
A series of reactive molecular dynamics simulations is used to study the internal structure of incipient soot particles obtained from acetylene pyrolysis. The simulations were performed using the ReaxFF potential at four different temperatures. The resulting soot particles are cataloged and analyzed to obtain statistics of their mass, volume, density, C/H ratio, number of cyclic structures, and other features. A total of 3324 incipient soot particles were analyzed in this study. Based on their structural characteristics, the incipient soot particles are classified into two classes, termed type 1 and type 2 incipient soot particles in this work. The radial distribution of density, cyclic (5-, 6-, or 7-member rings) structures, and C/H ratio inside the particles revealed a clear difference in the internal structure between type 1 and type 2 particles. These classes were further found to be well represented by the size of the particles, with smaller particles in type 1 and larger particles in type 2. The radial distributions of ring structures, density, and the C/H ratio indicated the presence of a dense core region in type 2 particles. In contrast, no clear evidence of the presence of a core was found in type 1 particles. In type 2 incipient soot particles, the boundary between the core and shell was found to be around 50-60% of the particle's radius of gyration.
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Affiliation(s)
- Khaled Mosharraf Mukut
- Department of Mechanical Engineering, Marquette University, Milwaukee, Wisconsin 53233, United States
| | - Anindya Ganguly
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3052, Australia
| | - Eirini Goudeli
- Department of Chemical Engineering, University of Melbourne, Parkville, Victoria 3052, Australia
| | - Georgios A Kelesidis
- Nanoscience and Advanced Materials Center (NAMC), Environmental and Occupational Health Science Institute, School of Public Health, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering, ETH Zürich, Zürich 8092, Switzerland
| | - Somesh P Roy
- Department of Mechanical Engineering, Marquette University, Milwaukee, Wisconsin 53233, United States
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Zhang M, Zhou B, Chen Y, Gong H. Kinetic Mechanism for Simulating the Temperature and Pressure Effect on the Explosive Decomposition of Acetylene by ReaxFF Molecular Dynamics. ChemistrySelect 2023. [DOI: 10.1002/slct.202204563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Affiliation(s)
- Minhua Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China
| | - Baofeng Zhou
- Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China
| | - Yifei Chen
- Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China
| | - Hao Gong
- Key Laboratory for Green Chemical Technology of Ministry of Education R&D Center for Petrochemical Technology Tianjin University Tianjin 300072 China
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Yuan H, Kong W, Xia J. Steered molecular dynamics and stability analysis on PAH dimerisation and condensation on fullerene and soot surfaces. Phys Chem Chem Phys 2021; 23:19590-19601. [PMID: 34524285 DOI: 10.1039/d1cp01019k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism of how a soot nucleus is impacted by polycyclic aromatic hydrocarbons (PAHs) and then grows through PAH condensation remains unclear. Using steered molecular dynamics (SMD), the non-bonding interaction between PAHs and soot was quantitatively studied using the free energy distribution during the dimerisation and condensation. The results showed that only two dimers (A7-A10 and 2 A10) remained stable at 1000 K. The simulations showed that PAH condensation on a fullerene should not be ignored in soot mass growth. For fullerenes with a diameter not less than 1.8 nm (C540), even A4 condenses at temperatures of 1500 K, and A10 condenses stably on the surface of fullerenes even at 2000 K. The effects of multilayers and hydrogenated fullerenes on the free energy of PAH condensation are different. The stability of PAH dimers and PAH condensation pairs was discussed through free energy and chemical equilibrium. The results show that larger dimers are more stable than small ones at flame temperatures. Condensation is far more important than nucleation in mass growth at flame temperatures. Furthermore, the larger the PAH is, the higher the transformation ratio of the PAH in condensation on soot and thus the more stable the condensation product is. Finally, both the stability analysis of an upper temperature limit for condensation and simulation results of ReaxFF-MD cross-confirm that pyrene stably condensates on a simplified nascent soot (C540) and a simulated soot (C658H319O9), respectively, at 1500 K, but not at higher temperatures over 1800 K.
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Affiliation(s)
- Hongliang Yuan
- Department of Mechanical and Aerospace Engineering & Institute of Energy Futures, Brunel University London, Uxbridge UB8 3PH, UK. .,Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China.,University of Chinese Academy of Sciences, Beijing 100039, China
| | - Wenjun Kong
- School of Astronautics, Beihang University, Beijing 100191, China.
| | - Jun Xia
- Department of Mechanical and Aerospace Engineering & Institute of Energy Futures, Brunel University London, Uxbridge UB8 3PH, UK.
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Lei T, Guo W, Liu Q, Jiao H, Cao DB, Teng B, Li YW, Liu X, Wen XD. Mechanism of Graphene Formation via Detonation Synthesis: A DFTB Nanoreactor Approach. J Chem Theory Comput 2019; 15:3654-3665. [DOI: 10.1021/acs.jctc.9b00158] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tingyu Lei
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Wenping Guo
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
| | - Qingya Liu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Haijun Jiao
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
| | - Dong-Bo Cao
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
| | - Botao Teng
- Key Lab of Advanced Catalytic Materials of Ministry of Education, College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Yong-Wang Li
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
| | - Xingchen Liu
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
| | - Xiao-Dong Wen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd., Huairou District, Beijing 101400, China
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Wen Y, Xue X, Long X, Zhang C. Cluster Evolution at Early Stages of 1,3,5-Triamino-2,4,6-trinitrobenzene under Various Heating Conditions: A Molecular Reactive Force Field Study. J Phys Chem A 2016; 120:3929-37. [DOI: 10.1021/acs.jpca.6b03795] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yushi Wen
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang, Sichuan 621900, China
| | - Xianggui Xue
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang, Sichuan 621900, China
| | - Xinping Long
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang, Sichuan 621900, China
| | - Chaoyang Zhang
- Institute of Chemical Materials, China Academy of Engineering Physics (CAEP), P.O. Box 919-311, Mianyang, Sichuan 621900, China
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