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Liu C, Aguirre NF, Cawkwell MJ, Batista ER, Yang P. Efficient Parameterization of Density Functional Tight-Binding for 5 f-Elements: A Th-O Case Study. J Chem Theory Comput 2024; 20:5923-5936. [PMID: 38990696 PMCID: PMC11270830 DOI: 10.1021/acs.jctc.4c00145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 06/23/2024] [Accepted: 06/26/2024] [Indexed: 07/13/2024]
Abstract
Density functional tight binding (DFTB) models for f-element species are challenging to parametrize owing to the large number of adjustable parameters. The explicit optimization of the terms entering the semiempirical DFTB Hamiltonian related to f orbitals is crucial to generating a reliable parametrization for f-block elements, because they play import roles in bonding interactions. However, since the number of parameters grows quadratically with the number of orbitals, the computational cost for parameter optimization is much more expensive for the f-elements than for the main group elements. In this work we present a set of efficient approaches for mitigating the hurdle imposed by the large size of the parameter space. A novel group-by-orbital correction functions for two-center bond integrals was developed. With this approach the number of parameters is reduced, and it grows linearly with the number of elements, maintaining the accuracy and the number of parameters, in the case of f elements, by more than 40%. The parameter optimization step was accelerated by means of the mini-batch BFGS method. This method allows parameter optimizations with much larger training sets than other single batch methods. A stochastic optimizer was employed that helped overcome shallow local minima in the objective function. The proposed algorithm was used to parametrize the DFTB Hamiltonian for the Th-O system, which was subsequently applied to the study of ThO2 nanoparticles. The training set consisted of 6322 unique structures, which is barely feasible with conventional optimization methods. The optimized parameter set, LANL-ThO, displays good agreement with DFT-calculated properties such as energies, forces, and structures for both clusters and bulk ThO2. Benefiting from the fewer number of parameters and lower computational costs for objective function evaluations, this new approach shows its potential applications in DFTB parametrization for elements with high angular momentum, which present a challenge to conventional methods.
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Affiliation(s)
- Chang Liu
- Theoretical Division, Los Alamos
National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Néstor F. Aguirre
- Theoretical Division, Los Alamos
National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Marc J. Cawkwell
- Theoretical Division, Los Alamos
National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Enrique R. Batista
- Theoretical Division, Los Alamos
National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Ping Yang
- Theoretical Division, Los Alamos
National Laboratory, Los Alamos, New Mexico 87545, United States
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Zhou J, Wang J, Tang S, Li Z, Xu Y, Niu X. Simulations on coal water slurry gasification by molecular dynamics method with ReaxFF. J Mol Model 2024; 30:213. [PMID: 38884874 DOI: 10.1007/s00894-024-06017-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Accepted: 06/10/2024] [Indexed: 06/18/2024]
Abstract
CONTEXT Coal water slurry (CWS) is a new type of liquid coal product with low pollution, which is mainly used in the chemical industry to produce syngas (CO + H2). It is of great significance to study the microscopic mechanism of CWS gasification reaction for improving the efficiency of coal gasification. In this paper, the method of molecular dynamics based on reaction force fields (ReaxFF-MD) is used to study the gasification process of CWS/O2 system at different temperatures. The results show that, in the range of 1600-2400 K, the macromolecular network structure of lignite is decomposed into a large number of small molecular structures and a small number of light tar free radical fragments, and the types and quantities of reaction products increased rapidly. At 2400-4000 K, the free radical fragments of light tar are further decomposed and reacted with gasification agents, but the types and quantities of reaction products have little change. At 3600 K, a full gasification reaction occurred in the system, and the content of syngas is the highest. METHODS The model was established and optimized by Materials Studio (MS) software. Based on ReaxFF-MD method, Lammps software was used to simulate the gasification process of CWS/O2 system, and the reaction force field files containing C, H, O, N, and S element were used. By calculating the activation energy of gasification reaction, the rationality of the model and calculation method was illustrated. The post-processing of the results was implemented using OVITO, ChemDraw software, and self-programmed Python scripts.
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Affiliation(s)
- Junjie Zhou
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Juan Wang
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Songzhen Tang
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China.
| | - Zhicong Li
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Yanyan Xu
- School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Xin Niu
- Henan Zhonghong Coal Group Co., Ltd., Pingdingshan, 467000, Henan, China
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Wu Y, Tian Z, Li B, Gu J, Yuan H, Liu W, Ge H. Quantum chemical study on the catalytic debromination mechanism of brominated epoxy resins. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:132943. [PMID: 38141316 DOI: 10.1016/j.jhazmat.2023.132943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 10/06/2023] [Accepted: 11/04/2023] [Indexed: 12/25/2023]
Abstract
The study employed Density Functional Theory (DFT) to investigate the catalytic debromination mechanism of brominated epoxy resins (BERs) by iron (Fe) and copper (Cu) catalysts. By introducing electric field (EF), intramolecular electron transfer and polarization effects on BERs debromination were explored and experimentally validated. Results indicated that the bond dissociation energy (BDE) of the C-Br bond was 312.27 kJ/mol without catalysis, while with Fe, Cu, and EF, it was 114.47 kJ/mol, 94.85 kJ/mol, and 292.59 kJ/mol, respectively, enhancing reactivity. EF parallel to the C-Br bond and oriented toward the C atom, altered electrostatic potential and dipole moment around C-Br bond, leading to 68.60% and 50.19% increment in electronic contribution difference and molecule polarity, respectively, thereby reducing the C-Br BDE. Fe and Cu facilitated electron transfers with BERs, inducing reactions between their negative electrostatic potentials and Br's positive potential, changing electron sharing, resulting in 19.87% and 12.11% increase in polarity, respectively, and further BDE reduction. Structural modifications by the EF and catalysts also intensified van der Waals forces with bromine atoms and decreased spatial hindrance, collectively making C-Br bond breakage easier. Experiments revealed the EF enhanced BERs' debromination efficiency but hindered Fe/Cu's catalysis at lower temperatures.
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Affiliation(s)
- Yufeng Wu
- Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China
| | - Zhongxun Tian
- Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China
| | - Bin Li
- Institute of Circular Economy, Beijing University of Technology, Beijing 100124, PR China; Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China.
| | - Jing Gu
- Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences, Guangzhou 510070, PR China
| | - Haoran Yuan
- Guangzhou Institute of Energy Conversion, The Chinese Academy of Sciences, Guangzhou 510070, PR China
| | - Weijun Liu
- School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, PR China
| | - Huijie Ge
- Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China
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Xiong Z, Li K, Bu Y, Liang Z, Zhang H, Liao H, Zhou F, Zhang J. The evolution of atomistic structure and mechanical property of coke in the gasification process with CO 2 and H 2O at different temperatures: A ReaxFF molecular dynamics study. J Mol Model 2023; 29:372. [PMID: 37955718 DOI: 10.1007/s00894-023-05773-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Accepted: 10/26/2023] [Indexed: 11/14/2023]
Abstract
CONTEXT An atomistic coke carbon model was constructed to simulate the structural evolution in the gasification and stretching process. The coke model was placed in a box with different CO2/H2O content to investigate the evolution of the atomistic structure of coke during the gasification. It was found that different atmospheric concentrations had different effects on the structure and reaction sites of the coke model. The CO2 molecules tended to dissolve on the surface of coke and disrupt its surface structure, while H2O molecules were more likely to enter the coke model to disrupt the internal structure. For tensile simulation, it was found that CO2 and H2O had different effects on the tensile resistance of the coke model. Controlling the composition content of the reaction gas can effectively influence the tensile strength of the coke model. By revealing the behavior of coke model at the micro scale, it provides a theoretical basis for the industrial coke application process. METHODS Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) was used to conduct the molecular dynamics using the reactive force field (ReaxFF). The atomistic model of coke carbon was constructed using the well-known annealing and quenching method, and its composition is determined according to the element analysis of industrial coke. The structural evolution in the gasification with CO2/H2O and the stretching process were analyzed in detail. Molecular dynamics simulations with reactive force field (ReaxFF-MD) were used to simulate the coke dissolution reaction under CO2/H2O atmosphere and the coke stretching process. The atmosphere ratio was modified to investigate the changes in coke structure under different atmosphere conditions. The Packmol software was used to place gas and coke models into the same box. During the reaction process, the Ovito software was used to perform corresponding visualization analysis on the changes in the atomic structure of coke.
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Affiliation(s)
- Zixin Xiong
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China
| | - Kejiang Li
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China.
| | - Yushan Bu
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China
| | - Zeng Liang
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China
| | - Hang Zhang
- Modern Technology and Education Centre, North China University of Science and Technology, Tangshan, Tangshan, 063009, People's Republic of China
| | - Haotian Liao
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China
| | - Feng Zhou
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China
| | - Jianliang Zhang
- School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Haidian District, 30 Xueyuan Rd, Beijing, 100083, People's Republic of China
- School of Chemical Engineering, The University of Queensland, St Lucia, QLD, 4072, Australia
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Yan Y, Xu J, Liu S, Wang M, Yang C. Reactive force-field MD simulation on the pyrolysis process of phenolic with various cross-linked and branched structures. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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6
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Oxidation decomposition mechanism of hexamethyldisiloxane. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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8
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Cao R, Zhou R, Liu Y, Ma D, Wang J, Guan Y, Yao Q, Sun M. Research on the pyrolysis characteristics and mechanisms of waste printed circuit boards at fast and slow heating rates. WASTE MANAGEMENT (NEW YORK, N.Y.) 2022; 149:134-145. [PMID: 35728477 DOI: 10.1016/j.wasman.2022.06.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 05/24/2022] [Accepted: 06/12/2022] [Indexed: 06/15/2023]
Abstract
The pyrolysis treatment of waste printed circuit boards (WPCBs) shows great potential for sustainable treatment and hazard reduction. In this work, based on thermogravimetry (TG), pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), and density functional theory (DFT), the thermal weight loss, product distribution, and kinetics of WPCBs pyrolysis were studied by single-step and multi-step pyrolysis at fast (600 °C/min) and slow (10 °C/min) heating rates. The heating rates of TG and Py-GC/MS were the same for each group of experiments. In addition, the bond dissociation energy (BDE) of WPCBs polymer monomers was calculated by DFT method. Compared with slow pyrolysis, the final weight loss of fast pyrolysis is reduced by 0.76 wt%. The kinetic analysis indicates that the activation energies of main pyrolysis stages range from 98.29 kJ/mol to 177.59 kJ/mol. The volatile products of fast pyrolysis are mainly phenols and aromatics. With the increase of multi-step pyrolysis temperature, the order of the escaping volatiles is phenols, hydrocarbyl phenols, aromatics, and benzene (or diphenyl phenol). The pyrolysis residue of WPCBs may contains phenolics and polymers. Based on the free radical reactions, the mechanism and reaction pathways of WPCBs pyrolysis were deduced by the DFT. Moreover, a large amount of benzene is produced by pyrolysis, and its formation mechanism was elaborated.
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Affiliation(s)
- Rui Cao
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China
| | - Ruishi Zhou
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China
| | - Yongqi Liu
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China
| | - Duo Ma
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China
| | - Jing Wang
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China
| | - Yulei Guan
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China
| | - Qiuxiang Yao
- School of Science, Xijing University, Xi'an Key Laboratory of Advanced Photo-electronics Materials and Energy Conversion Device, Xi'an 710123, Shaanxi, China.
| | - Ming Sun
- School of Chemical Engineering, Northwest University, International Science & Technology Cooperation Base of MOST for Clean Utilization of Hydrocarbon Resources, Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, Shaanxi, China.
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9
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Ji J, Zhu W. Structural stability and initial decomposition mechanisms of BTF crystal induced by vacancy defects: a computational study. CrystEngComm 2022. [DOI: 10.1039/d2ce00503d] [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
Density functional tight binding (DFTB) and DFTB-based molecular dynamics (DFTB-MD) were used to study the effects of vacancy defects on the structure, stability, and initial decomposition mechanisms of condensed phase...
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10
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Ji J, Zhu W. Thermal decomposition mechanisms of benzotrifuroxan:2,4,6-trinitrotoluene cocrystal using quantum molecular dynamics simulations. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138820] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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12
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Pyrolysis and carbonization of polyvinyl chloride under electric field: A computational study. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Xing X, Niu X, Liu Y, Yang C, Wang S, Li Y, Jing X. In-depth understanding on the early stage of phenolic resin thermal pyrolysis through ReaxFF-molecular dynamics simulation. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2021.109534] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Wang Y, Yao S, Wang W, Qiu C, Zhang J, Deng S, Dong H, Wu C, Wang J. Pyrolysis of vulcanized styrene-butadiene rubber via ReaxFF molecular dynamics simulation. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.10.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Ji J, Wang K, Zhu S, Zhu W. Structure, intermolecular interactions, and dynamic properties of NTO crystals with impurity defects: a computational study. CrystEngComm 2021. [DOI: 10.1039/d0ce01670e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Frontier orbitals distribute in the position of impurity molecules, whose adjacent NTO molecules begin to decompose first.
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Affiliation(s)
- Jincheng Ji
- Institute for Computation in Molecular and Materials Science
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- China
| | - Kun Wang
- Institute for Computation in Molecular and Materials Science
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- China
| | - Simin Zhu
- Institute for Computation in Molecular and Materials Science
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- China
| | - Weihua Zhu
- Institute for Computation in Molecular and Materials Science
- School of Chemical Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- China
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Dethan JFN, Swamy V. Tensile properties of hydrogenated hybrid graphene–hexagonal boron nitride nanosheets: a reactive force field study. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1810854] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Jacob F. N. Dethan
- Faculty of Science and Technology, Universitas Buddhi Dharma, Tangerang, Indonesia
- School of Engineering, Monash University Malaysia, Bandar Sunway, Malaysia
| | - Varghese Swamy
- School of Engineering, Monash University Malaysia, Bandar Sunway, Malaysia
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17
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Dantanarayana V, Nematiaram T, Vong D, Anthony JE, Troisi A, Nguyen Cong K, Goldman N, Faller R, Moulé AJ. Predictive Model of Charge Mobilities in Organic Semiconductor Small Molecules with Force-Matched Potentials. J Chem Theory Comput 2020; 16:3494-3503. [DOI: 10.1021/acs.jctc.0c00211] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Varuni Dantanarayana
- Department of Chemistry, University of California—Davis, Davis, California 95616, United States
- Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Tahereh Nematiaram
- Department of Chemistry and Materials Innovation Factory, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Daniel Vong
- Department of Materials Science and Engineering, University of California—Davis, Davis, California 95616, United States
| | - John E. Anthony
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Alessandro Troisi
- Department of Chemistry and Materials Innovation Factory, University of Liverpool, Liverpool L69 3BX, United Kingdom
| | - Kien Nguyen Cong
- Department of Physics, University of South Florida, Tampa, Florida 33620, United States
| | - Nir Goldman
- Lawrence Livermore National Laboratory, Livermore, California 94550, United States
- Department of Chemical Engineering, University of California—Davis - Davis, California 95616, United States
| | - Roland Faller
- Department of Chemical Engineering, University of California—Davis - Davis, California 95616, United States
| | - Adam J. Moulé
- Department of Chemical Engineering, University of California—Davis - Davis, California 95616, United States
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Deng S, Zhuo H, Wang Y, Leng S, Zhuang G, Zhong X, Wei Z, Yao Z, Wang JG. Multiscale Simulation on Product Distribution from Pyrolysis of Styrene-Butadiene Rubber. Polymers (Basel) 2019; 11:polym11121967. [PMID: 31795514 PMCID: PMC6960849 DOI: 10.3390/polym11121967] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 11/08/2019] [Accepted: 11/20/2019] [Indexed: 11/26/2022] Open
Abstract
Pyrolysis of styrene-butadiene rubber receives renewed attention due to its application in tackling the waste tire disposal problem while allowing energy recovery. The density functional theory calculation (DFT) and ReaxFF molecular dynamics simulation (MD) are adopted to study the pyrolysis process with the variation of temperature and pressure. The bond dissociation energies of intramonomer and intermonomer bonds in trimers with different linking methods are calculated by DFT, where the bond with low energy tends to break during the pyrolysis process. The following MD simulation shows the pyrolysis product distribution of chain segments in styrene-butadiene rubber, where bond breaking positions in MD agree well with corresponding results in DFT and experiment. The next nearest neighbor bonds (single bonds) connected with double bond or benzene usually have lower dissociation energies than other single bonds and prone to break during the pyrolysis process. And thus, the intermonomer bonds tend to break at relatively low temperatures (around 650 K in experiment) prior to intramonomer bonds, which result in the emergence of monomers. With the temperature increase, intramonomer bonds are broken and thus large fragments are further pyrolyzed into small ones (e.g., C2 and C). Besides, the pressure strongly influences the product distribution, where high pressures promote the occurrence of secondary reactions.
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Affiliation(s)
- Shengwei Deng
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
- Correspondence: (S.D.); (S.L.); (J.-g.W.)
| | - Han Zhuo
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Yinbin Wang
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Shuai Leng
- Qingdao Ecostar Intelligent Equipment Co., Ltd., Qingdao 266400, China
- Correspondence: (S.D.); (S.L.); (J.-g.W.)
| | - Guilin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Xing Zhong
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Zhongzhe Wei
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Zihao Yao
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
| | - Jian-guo Wang
- Institute of Industrial Catalysis, College of Chemical Engineering, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China
- Correspondence: (S.D.); (S.L.); (J.-g.W.)
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19
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Khajeh A, Chen Z, Kim SH, Martini A. Effect of Ambient Chemistry on Friction at the Basal Plane of Graphite. ACS APPLIED MATERIALS & INTERFACES 2019; 11:40800-40807. [PMID: 31578847 DOI: 10.1021/acsami.9b13261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Graphite is widely used as a solid lubricant due to its layered structure, which enables ultralow friction. However, the lubricity of graphite is affected by ambient conditions and previous studies have shown a sharp contrast between frictional behavior in vacuum or dry environments compared to humid air. Here, we studied the effect of organic gaseous species in the environment, specifically comparing the adsorption of phenol and pentanol vapor. Atomic force microscopy experiments and reactive molecular dynamics simulations showed that friction was larger with phenol than with pentanol. The simulation results were analyzed to test multiple hypotheses to explain the friction difference, and it was found that mechanically driven chemical bonding between the tip and phenol molecules plays a critical role. Bonding increases the number of phenol molecules in the contact, which increases the adhesion as well as the number of atoms in registry with the topmost graphene layer acting as a pinning site to resist sliding. The findings of this research provide insight into how the chemistry of the operating environment can affect the frictional behavior of graphite and layered materials more generally.
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Affiliation(s)
- Arash Khajeh
- Department of Mechanical Engineering , University of California Merced , 5200 N. Lake Road , Merced , California 95343 , United States
| | - Zhe Chen
- Department of Chemical Engineering and Materials Research Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Seong H Kim
- Department of Chemical Engineering and Materials Research Institute , Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Ashlie Martini
- Department of Mechanical Engineering , University of California Merced , 5200 N. Lake Road , Merced , California 95343 , United States
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20
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Mniszewski SM, Perriot R, Rubensson EH, Negre CFA, Cawkwell MJ, Niklasson AMN. Linear Scaling Pseudo Fermi-Operator Expansion for Fractional Occupation. J Chem Theory Comput 2018; 15:190-200. [DOI: 10.1021/acs.jctc.8b00887] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Susan M. Mniszewski
- Computer, Computational, and Statistical Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Romain Perriot
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Emanuel H. Rubensson
- Division of Scientific Computing, Department of Information Technology, Uppsala University, Box 337, SE-751 05 Uppsala, Sweden
| | - Christian F. A. Negre
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Marc J. Cawkwell
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Anders M. N. Niklasson
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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21
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Kroonblawd MP, Pietrucci F, Saitta AM, Goldman N. Generating Converged Accurate Free Energy Surfaces for Chemical Reactions with a Force-Matched Semiempirical Model. J Chem Theory Comput 2018. [PMID: 29543444 DOI: 10.1021/acs.jctc.7b01266] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We demonstrate the capability of creating robust density functional tight binding (DFTB) models for chemical reactivity in prebiotic mixtures through force matching to short time scale quantum free energy estimates. Molecular dynamics using density functional theory (DFT) is a highly accurate approach to generate free energy surfaces for chemical reactions, but the extreme computational cost often limits the time scales and range of thermodynamic states that can feasibly be studied. In contrast, DFTB is a semiempirical quantum method that affords up to a thousandfold reduction in cost and can recover DFT-level accuracy. Here, we show that a force-matched DFTB model for aqueous glycine condensation reactions yields free energy surfaces that are consistent with experimental observations of reaction energetics. Convergence analysis reveals that multiple nanoseconds of combined trajectory are needed to reach a steady-fluctuating free energy estimate for glycine condensation. Predictive accuracy of force-matched DFTB is demonstrated by direct comparison to DFT, with the two approaches yielding surfaces with large regions that differ by only a few kcal mol-1.
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Affiliation(s)
- Matthew P Kroonblawd
- Physical and Life Sciences Directorate , Lawrence Livermore National Laboratory , Livermore , California 94550 , United States
| | - Fabio Pietrucci
- Sorbonne Université, Muséum National d'Histoire Naturelle , UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC , F-75005 Paris , France
| | - Antonino Marco Saitta
- Sorbonne Université, Muséum National d'Histoire Naturelle , UMR CNRS 7590, IRD, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC , F-75005 Paris , France
| | - Nir Goldman
- Physical and Life Sciences Directorate , Lawrence Livermore National Laboratory , Livermore , California 94550 , United States.,Department of Chemical Engineering , University of California , Davis , California 95616 , United States
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22
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Bal KM, Neyts EC. Direct observation of realistic-temperature fuel combustion mechanisms in atomistic simulations. Chem Sci 2016; 7:5280-5286. [PMID: 30155178 PMCID: PMC6020539 DOI: 10.1039/c6sc00498a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 05/04/2016] [Indexed: 11/29/2022] Open
Abstract
Advanced accelerated molecular dynamics simulations provide a detailed atomic-level picture of combustion at realistic temperatures and pressures.
Atomistic simulations can in principle provide an unbiased description of all mechanisms, intermediates, and products of complex chemical processes. However, due to the severe time scale limitation of conventional simulation techniques, unrealistically high simulation temperatures are usually applied, which are a poor approximation of most practically relevant low-temperature applications. In this work, we demonstrate the direct observation at the atomic scale of the pyrolysis and oxidation of n-dodecane at temperatures as low as 700 K through the use of a novel simulation technique, collective variable-driven hyperdynamics (CVHD). A simulated timescale of up to 39 seconds is reached. Product compositions and dominant mechanisms are found to be strongly temperature-dependent, and are consistent with experiments and kinetic models. These simulations provide a first atomic-level look at the full dynamics of the complicated fuel combustion process at industrially relevant temperatures and time scales, unattainable by conventional molecular dynamics simulations.
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Affiliation(s)
- Kristof M Bal
- Department of Chemistry , University of Antwerp , Universiteitsplein 1 , 2610 Antwerp , Belgium .
| | - Erik C Neyts
- Department of Chemistry , University of Antwerp , Universiteitsplein 1 , 2610 Antwerp , Belgium .
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23
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Zhong Y, Jing X, Wang S, Jia QX. Behavior investigation of phenolic hydroxyl groups during the pyrolysis of cured phenolic resin via molecular dynamics simulation. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2015.11.017] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Bian C, Wang S, Liu Y, Jing X. Thermal stability of phenolic resin: new insights based on bond dissociation energy and reactivity of functional groups. RSC Adv 2016. [DOI: 10.1039/c6ra07597e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Based on bisphenol-F-like model molecules, the bond dissociation energies and Fukui function were calculated to interpret the relationship between the atomistic structure and thermal properties of the phenolic resin.
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Affiliation(s)
- Cheng Bian
- Department of Applied Chemistry
- School of Science
- Xi'an Jiaotong University
- Xi'an
- China
| | - Shujuan Wang
- Department of Applied Chemistry
- School of Science
- Xi'an Jiaotong University
- Xi'an
- China
| | - Yuhong Liu
- Department of Chemical Engineering
- School of Chemical Engineering and Technology
- Xi'an Jiaotong University
- Xi'an
- China
| | - Xinli Jing
- Department of Applied Chemistry
- School of Science
- Xi'an Jiaotong University
- Xi'an
- China
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25
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Failure of single phenolic chains and cross-links: Energetics, mechanisms, and alternative linker design. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.10.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Goldman N, Fried LE, Koziol L. Using Force-Matched Potentials To Improve the Accuracy of Density Functional Tight Binding for Reactive Conditions. J Chem Theory Comput 2015; 11:4530-5. [DOI: 10.1021/acs.jctc.5b00742] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nir Goldman
- Physical
and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Laurence E. Fried
- Physical
and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Lucas Koziol
- Physical
and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
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27
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Ahubelem N, Shah K, Moghtaderi B, Page AJ. Quantum Chemical Molecular Dynamics Simulations of 1,3-Dichloropropene Combustion. J Phys Chem A 2015; 119:9307-16. [PMID: 26252869 DOI: 10.1021/acs.jpca.5b06446] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxidative decomposition of 1,3-dichloropropene was investigated using quantum chemical molecular dynamics (QM/MD) at 1500 and 3000 K. Thermal oxidation of 1,3-dichloropropene was initiated by (1) abstraction of allylic H/Cl by O2 and (2) intra-annular C-Cl bond scission and elimination of allylic Cl. A kinetic analysis shows that (2) is the more dominant initiation pathway, in agreement with QM/MD results. These QM/MD simulations reveal new routes to the formation of major products (H2O, CO, HCl, CO2), which are propagated primarily by the chloroperoxy (ClO2), OH, and 1,3-dichloropropene derived radicals. In particular, intra-annular C-C/C-H bond dissociation reactions of intermediate aldehydes/ketones are shown to play a dominant role in the formation of CO and CO2. Our simulations demonstrate that both combustion temperature and radical concentration can influence the product yield, however not the combustion mechanism.
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Affiliation(s)
- Nwakamma Ahubelem
- Newcastle Institute for Energy and Resources, The University of Newcastle , Callaghan, NSW 2308, Australia
| | - Kalpit Shah
- Newcastle Institute for Energy and Resources, The University of Newcastle , Callaghan, NSW 2308, Australia
| | - Behdad Moghtaderi
- Newcastle Institute for Energy and Resources, The University of Newcastle , Callaghan, NSW 2308, Australia
| | - Alister J Page
- Newcastle Institute for Energy and Resources, The University of Newcastle , Callaghan, NSW 2308, Australia
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28
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Bian C, Wang Y, Wang S, Zhong Y, Liu Y, Jing X. Influence of borate structure on the thermal stability of boron-containing phenolic resins: A DFT study. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2015.05.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Suleimanov YV, Green WH. Automated Discovery of Elementary Chemical Reaction Steps Using Freezing String and Berny Optimization Methods. J Chem Theory Comput 2015; 11:4248-59. [DOI: 10.1021/acs.jctc.5b00407] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yury V. Suleimanov
- Computation-based
Science and Technology Research Center, Cyprus Institute, 20
Kavafi Street, Nicosia 2121, Cyprus
- Department
of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - William H. Green
- Department
of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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30
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Döntgen M, Przybylski-Freund MD, Kröger LC, Kopp WA, Ismail AE, Leonhard K. Automated Discovery of Reaction Pathways, Rate Constants, and Transition States Using Reactive Molecular Dynamics Simulations. J Chem Theory Comput 2015; 11:2517-24. [DOI: 10.1021/acs.jctc.5b00201] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Malte Döntgen
- Chair of Technical Thermodynamics, ‡Aachener Verfahrenstechnik, Faculty
of Mechanical
Engineering, §AICES Graduate School, RWTH Aachen University, 52062 Aachen, Germany
| | - Marie-Dominique Przybylski-Freund
- Chair of Technical Thermodynamics, ‡Aachener Verfahrenstechnik, Faculty
of Mechanical
Engineering, §AICES Graduate School, RWTH Aachen University, 52062 Aachen, Germany
| | - Leif C. Kröger
- Chair of Technical Thermodynamics, ‡Aachener Verfahrenstechnik, Faculty
of Mechanical
Engineering, §AICES Graduate School, RWTH Aachen University, 52062 Aachen, Germany
| | - Wassja A. Kopp
- Chair of Technical Thermodynamics, ‡Aachener Verfahrenstechnik, Faculty
of Mechanical
Engineering, §AICES Graduate School, RWTH Aachen University, 52062 Aachen, Germany
| | - Ahmed E. Ismail
- Chair of Technical Thermodynamics, ‡Aachener Verfahrenstechnik, Faculty
of Mechanical
Engineering, §AICES Graduate School, RWTH Aachen University, 52062 Aachen, Germany
| | - Kai Leonhard
- Chair of Technical Thermodynamics, ‡Aachener Verfahrenstechnik, Faculty
of Mechanical
Engineering, §AICES Graduate School, RWTH Aachen University, 52062 Aachen, Germany
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31
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Jiang K, Zhang N, Zhang H, Wang J, Qian M. Investigation on the Gas-phase decomposition of trichlorfon by GC-MS and theoretical calculation. PLoS One 2015; 10:e0121389. [PMID: 25856549 PMCID: PMC4391870 DOI: 10.1371/journal.pone.0121389] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Accepted: 01/31/2015] [Indexed: 11/29/2022] Open
Abstract
The gas phase pyrolysis of trichlorfon was investigated by the on-line gas chromatography – mass spectrometry (GC-MS) pyrolysis and theoretical calculations. Two reaction channels were proposed in the pyrolytic reaction, by analyzing the detected pyrolytic products in the total ion chromatography, including 2,2,2-trichloroacetaldehyde, dimethyl phosphite, and dichlorvos. Theoretical calculations showed that there is an intramolecular hydrogen bond between the hydroxyl group and the phosphate O atom in trichlorfon, through which the hydroxyl H atom can be easily transferred to phosphate O atom to trigger two pyrolytic channels. In path-a, migration of H atom results in direct decomposition of trichlorfon to give 2,2,2-trichloroacetaldehyde and dimethyl phosphite in one step. In path-b, migration of H atom in trichlorfon is combined with formation of the O-P bond to give an intermediate, followed by HCl elimination to afford dichlorvos. Path-a is kinetically more favorable than path-b, which is consistent with the GC-MS results.
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Affiliation(s)
- Kezhi Jiang
- Key Laboratory of Organosilicon Chemistry and Material Technology, Hangzhou Normal University, Hangzhou, Zhejiang, China
| | - Ningwen Zhang
- Key Laboratory of Organosilicon Chemistry and Material Technology, Hangzhou Normal University, Hangzhou, Zhejiang, China
| | - Hu Zhang
- MOA Key Lab for Pesticide Residue Detection, Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang, China
| | - Jianmei Wang
- MOA Key Lab for Pesticide Residue Detection, Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang, China
| | - Mingrong Qian
- MOA Key Lab for Pesticide Residue Detection, Institute of Quality and Standard for Agro-products, Zhejiang Academy of Agricultural Sciences, Hangzhou, Zhejiang, China
- * E-mail:
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32
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33
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Gao N, Jiang X, Liu YH. Dipropargyl ether bisphenol A based boron-containing polymer: synthesis, characterization and molecular dynamics simulations of the resulting pyrolysis and carbonization. RSC Adv 2015. [DOI: 10.1039/c4ra12694g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The time evolution of major pyrolysis products including small-molecule species of a dipropargyl ether bisphenol A based novel boron-containing polymer was examined via ReaxFF-MD simulation (Color code: C, grey; O, red; H, white; B, yellow).
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Affiliation(s)
- N. Gao
- Department of Chemical Engineering
- School of Chemical Engineering and Technology
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - X. Jiang
- Department of Chemical Engineering
- School of Chemical Engineering and Technology
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Y. H. Liu
- Department of Chemical Engineering
- School of Chemical Engineering and Technology
- Xi'an Jiaotong University
- Xi'an 710049
- China
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34
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Goldman N, Bastea S. Nitrogen Oxides As a Chemistry Trap in Detonating Oxygen-Rich Materials. J Phys Chem A 2014; 118:2897-903. [DOI: 10.1021/jp501455z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nir Goldman
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue L-288, Livermore, California 94550, United States
| | - Sorin Bastea
- Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue L-288, Livermore, California 94550, United States
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35
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36
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Nian J, Gao P, Wang Y, Guo Z, Liu W. Theoretical investigation of atomic oxygen erosion mechanisms of 1,3-didecyl cyclopentane, 1,3-dioctyldodecyl cyclopentane and alkylated cyclopentane. RSC Adv 2014. [DOI: 10.1039/c4ra07582j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Atomic oxygen erosion mechanisms of 1,3-didecyl cyclopentane, 1,3-dioctyldodecyl cyclopentane and alkylated cyclopentane.
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Affiliation(s)
- Jingyan Nian
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000, China
| | - Ping Gao
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000, China
| | - Yongcheng Wang
- College of Chemistry and Chemical Engineering
- Northwest Normal University
- Lanzhou 730070, China
| | - Zhiguang Guo
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000, China
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials and Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
| | - Weimin Liu
- State Key Laboratory of Solid Lubrication
- Lanzhou Institute of Chemical Physics
- Chinese Academy of Sciences
- Lanzhou 730000, China
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37
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Bauschlicher CW, Qi T, Reed EJ, Lenfant A, Lawson JW, Desai TG. Comparison of ReaxFF, DFTB, and DFT for Phenolic Pyrolysis. 2. Elementary Reaction Paths. J Phys Chem A 2013; 117:11126-35. [DOI: 10.1021/jp408113w] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Charles W. Bauschlicher
- Mail Stop 230-3, Entry Systems and Technology Division, NASA Ames Research Center, Moffett
Field, California 94035, United States
| | - Tingting Qi
- Department
of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | - Evan J. Reed
- Department
of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States
| | - Antonin Lenfant
- Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States and
- Department of Computer Science, Institut Supérieur d’Electronique de Paris, 28 Rue Notre-Dame des Champs, 75006 Paris, France
| | - John W. Lawson
- Mail Stop
234, Thermal Protection Materials Branch, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Tapan G. Desai
- Advanced Cooling
Technologies, Inc., Lancaster, Pennsylvania 17601, United States
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