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Zhang Y, Zeng S, Li J, Dai Y, Chen S, Zeng J. Molecular dynamics simulation of the interaction between monofluoronitrobenzene and Ti electrode. J Mol Graph Model 2024; 126:108644. [PMID: 37832341 DOI: 10.1016/j.jmgm.2023.108644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 09/24/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023]
Abstract
In the process of degradation of aqueous fluoro-nitrobenzene (FNB) solution by titanium (Ti) electrode, the interaction between aqueous FNB solution and Ti electrode has an important impact on the performance and catalytic performance of electrode materials. The interaction involves complex physical, chemical and physical chemical processes, however, the mechanism of action is still unclear. In this study, Materials Studio software was used to design and construct molecular models of the interactions between aqueous FNB (p-, m-, o-FNB) solutions and Ti electrode, and molecular dynamics (MD) simulation was carried out in the absence of applied electric field and external electric field of 0.02 V/Å, respectively. Density functional theory (DFT) method was used to calculate the frontier molecular orbitals of three FNB molecules. Based on the calculation and analysis of the interaction energy (ΔE), diffusion coefficient (D) and radial distribution function (RDF), the interaction mechanism was discussed. It provides a theoretical basis for further research and development of Ti electrode degradation of fluorine compounds. The results showed that the order of ΔE between the three different aqueous FNB solutions and Ti surface is m-FNB > p-FNB > o-FNB when there is no external electric field. Under electric field of 0.02 V/Å, the order is p-FNB > m-FNB > o-FNB. The substitution position of F has an important effect on the HOMO of the nitro group and the LUMO of C-H in the three FNB molecules, and also affects the chemical reaction activity. In the model system, the diffusivity of different FNB solutions with electric field is less than that without electric field. The presence of an external electric field makes the diffusion of water and FNB molecules more orderly. The analysis results of RDF show that the bonding interactions between different FNB molecules and Ti surface is not much different before 3.5 Å, and all of them are weak. At about 8 Å, FNB molecule forms a non-bond with Ti electrode. ΔE, D and RDF of the model system can be changed by applying a certain external electric field, and the results are in better agreement with the experimental results.
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Affiliation(s)
- Yan Zhang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Shuyu Zeng
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Jingwen Li
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Yong Dai
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Song Chen
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Jianping Zeng
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China; Department of Chemistry, Nanjing University of Science and Technology, Nanjing, 210094, China.
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Zhang K, Ge F, Tang F, Tan L, Qiu Y, Zhu X. A structure-property study for konjac glucomannan and guar galactomannan: Selective carboxylation and scale inhibition. Carbohydr Polym 2023; 299:120220. [PMID: 36876821 DOI: 10.1016/j.carbpol.2022.120220] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 10/09/2022] [Accepted: 10/10/2022] [Indexed: 11/07/2022]
Abstract
The effect of structural difference for konjac glucomannan (KGM) and guar galactomannan (GGM) on their physicochemical properties including selective carboxylation, biodegradation and scale inhibition was firstly investigated. Compared with GGM, KGM can be specially modified by amino acid to prepare carboxyl-functionalized polysaccharides. The structure-activity relationship explaining the difference in carboxylation activity and the anti-scaling abilities of polysaccharides and carboxylated derivatives were explored by static anti-scaling, iron oxide dispersion and biodegradation tests coupled with structural and morphological characterizations. KGM with linear structure was preferred for carboxylated modification by glutamic acid (KGMG) and aspartic acid (KGMA) while GGM with branched structure failed to accomplish that due to steric hindrance. GGM and KGM showed limited scale inhibition performance, which was probably attributed to the moderate adsorption and isolation effect of macromolecular stereoscopic structure. While KGMA and KGMG performed as effective and degradable inhibitors for CaCO3 scale with inhibitory efficiencies > 90 %.
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Affiliation(s)
- Kegui Zhang
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China
| | - Feng Ge
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China
| | - Fukai Tang
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China
| | - Lichao Tan
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China
| | - Yue Qiu
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China
| | - Xinsheng Zhu
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing 210042, China.
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Faydy ME, Benhiba F, Warad I, Saoiabi S, Alharbi A, Alluhaybi AA, Lakhrissi B, Abdallah M, Zarrouk A. Bisquinoline analogs as corrosion inhibitors for carbon steel in acidic electrolyte: Experimental, DFT, and molecular dynamics simulation approaches. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Barzic AI, Albu RM, Stoica I, Varganici CD, Hulubei C. Polyimides containing cycloaliphatic units and chalcogen atoms as alternative shielding coatings for solar cells. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04283-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Benali O, Zebida M, Benhiba F, Zarrouk A, Maschke U. Carbon steel corrosion inhibition in H2SO4 0.5 M medium by thiazole-based molecules: Weight loss, electrochemical, XPS and molecular modeling approaches. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127556] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Stoica I, Barzic AI, Albu RM, Rusu R, Damaceanu M. Alignment layers based on poly(oxadiazole‐naphthylimide)s: New aspects on tuning anisotropy of the surface morphology and adhesion via rubbing. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Iuliana Stoica
- “Petru Poni” Institute of Macromolecular Chemistry Iasi Romania
| | | | | | - Radu‐Dan Rusu
- “Petru Poni” Institute of Macromolecular Chemistry Iasi Romania
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Yang Y, Adhikari S, Xu G. Molecular simulation to discover rheological properties and soil‐binding ability of PHPA polymer on montmorillonite surface. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6827] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yu Yang
- School of Civil Engineering and Transportation South China University of Technology Guangzhou China
| | - Sanjeev Adhikari
- Department of Construction Management Kennesaw State University Kennesaw GA USA
| | - Guoyuan Xu
- School of Civil Engineering and Transportation South China University of Technology Guangzhou China
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Kirubakaran P, Wang K, Rosbottom I, Cross RBM, Li M. Understanding the Effects of a Polymer on the Surface Dissolution of Pharmaceutical Cocrystals Using Combined Experimental and Molecular Dynamics Simulation Approaches. Mol Pharm 2020; 17:517-529. [PMID: 31887053 DOI: 10.1021/acs.molpharmaceut.9b00955] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The molecular interactions between the surfaces of cocrystals [i.e., flufenamic acid and theophylline (FFA-TP), flufenamic acid and nicotinamide (FFA-NIC), and carbamazepine and nicotinamide (CBZ-NIC)] and the polymers [i.e., polyethylene glycol (PEG), polyvinylpyrrolidone (PVP), and copolymer of vinylpyrrolidone (60%)/vinyl acetate (40%) (PVP-VA)] were investigated through combined experimental and molecular dynamics simulation approaches to resolve the mechanisms of cocrystal dissolution and precipitation. It was found that adsorption of the polymers on the surfaces of cocrystals might prevent the precipitation of the parent drug and alter the dissolution rate. The effect of polymers on precipitation could be determined by the cocrystal dissolution rate, the interactions of polymers with the surfaces of cocrystals, the characters of the noncovalent bonds formed between the polymers and the cocrystal surfaces, and the mobility and conformation of the polymers. The etching experiments of single cocrystals revealed that FFA-NIC and CBZ-NIC appeared as surface precipitation cocrystals while FFA-TP could lead to bulk precipitation. Both PVP and PVP-VA were good precipitation inhibitors for FFA-NIC, and they could completely inhibit the recrystallization of FFA III on the surfaces of dissolving cocrystals. In addition, as the adsorption of the polymer was slower than dissolution rate of the cocrystals, PVP and PVP-VA could only partially inhibit the recrystallization of CBZ dihydrate on the surface of CBZ-NIC. While PEG had no inhibitory effect on the surface crystallization of FFA-NIC and CBZ-NIC, due to its weak interactions with the surfaces of the cocrystals, it enhanced the dissolution performance of FFA-TP. In contrast, PVP and PVP-VA reduced the dissolution rate of FFA-TP and subsequently undermined the performance of cocrystals. Taken together, the approach of combining experimental and molecular dynamics simulation provided insights into the mechanisms of cocrystal dissolution as well as the polymers acting as inhibitory excipients for precipitation/recrystallization, making contribution to the development of novel formulations.
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Affiliation(s)
| | - Ke Wang
- School of Pharmacy , De Montfort University , The Gateway , Leicester LE1 9BH , U.K
| | - Ian Rosbottom
- Department of Chemical Engineering , Imperial College London , London SW7 2BX , U.K
| | | | - Mingzhong Li
- School of Pharmacy , De Montfort University , The Gateway , Leicester LE1 9BH , U.K
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Tong ZF, Zhang YH, Xie YB. Interaction mechanism between copolymer inhibitor and β-dicalcium silicate surface based on molecular dynamics simulation. Mol Phys 2020. [DOI: 10.1080/00268976.2019.1597196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Zhi-Fang Tong
- College of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, People’s Republic of China
| | - Yu-Heng Zhang
- College of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, People’s Republic of China
| | - Yun-Bing Xie
- College of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, People’s Republic of China
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Gurina D, Surov O, Voronova M, Zakharov A, Kiselev M. Water Effects on Molecular Adsorption of Poly(N-vinyl-2-pyrrolidone) on Cellulose Nanocrystals Surfaces: Molecular Dynamics Simulations. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2155. [PMID: 31277517 PMCID: PMC6651292 DOI: 10.3390/ma12132155] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 06/25/2019] [Accepted: 07/03/2019] [Indexed: 12/31/2022]
Abstract
Models of interaction between a poly(N-vinyl-2-pyrrolidone) macromolecule and a fragment of Iβ-cellulose were built in a vacuum and water environment. The models were made to interpret the mechanism of interaction of the polymer and cellulose nanocrystals by the classical molecular dynamics method. The structural behavior of a poly(N-vinyl-2-pyrrolidone) macromolecule in water has been studied in terms of the radius of gyration, atom-atom radial distribution functions and number of hydrogen bonds. It was found that the polymer has a high affinity with the solvent and each monomer unit has on average 0.5 hydrogen bonds. The structural and energy characteristics of the polymer adsorption were investigated at different initial positions of the poly(N-vinyl-2-pyrrolidone) macromolecule relative to the cellulose fragment. It was observed that the polymer macromolecule was mainly adsorbed on the cellulose fragment in the globular form. Moreover, in the solvent the interaction of poly(N-vinyl-2-pyrrolidone) with the cellulose hydrophobic surface was stronger than that with the hydrophilic one. This study will show that the presence of water makes the interaction between the polymer and cellulose weaker than in a vacuum, and the polymer and cellulose mainly interact through their solvation shells.
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Affiliation(s)
- Darya Gurina
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| | - Oleg Surov
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| | - Marina Voronova
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia
| | - Anatoly Zakharov
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia
| | - Mikhail Kiselev
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia
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