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Andreeva NA, Chaban VV. Self-healing in dielectric capacitors: a universal method to computationally rate newly introduced energy storage designs. Phys Chem Chem Phys 2024. [PMID: 39569946 DOI: 10.1039/d4cp03988b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2024]
Abstract
Metalized-film dielectric capacitors provide lump portions of energy on demand. While the capacities of various capacitor designs are comparable in magnitude, their stabilities make a difference. Dielectric breakdowns - micro-discharges - routinely occur in capacitors due to the inevitable presence of localized structure defects. The application of polymeric dielectric materials featuring flexible structures helps obtain more uniform insulating layers. At the modern technological level, it is impossible to completely avoid micro-discharges upon device exploitation. Every micro-discharge results in the formation of a soot channel, which is empirically known to exhibit a semiconductor behavior. Because of its capability to conduct electricity, the emerged soot channels harm the subsequent capacitor performance and decrease the amount of stored energy. The accumulation of the soot throughout a dielectric capacitor ultimately results in irreversible overall failure. We have developed a universal method for predicting the composition and evaluating the properties of the decomposition products obtained after the dielectric breakdown of a metalized film capacitor. This method applies to both existing and newly developed designs of capacitors. In our work, we compared samples based on polypropylene (PP), polyethylene terephthalate (PET), polycarbonate (PC), and Kapton. We found that the decomposition of the PP-based composition yields the greatest number of gaseous products. The corresponding soot has the lowest electrical conductivity compared to other samples. The smallest fraction of gaseous products and the highest conductivity corresponded to the Kapton-based system. According to the electrical conductivity, the obtained soot samples have been ranked in the following order: PP < PET < PC < Kapton. The resulting gas phase content is as follows: PP (12.3 wt%) > PC (6.4 wt%) > PET (6.2 wt%) > Kapton (5.1 wt%). The obtained results are in agreement with the experimental data on the self-healing efficiency of metalized-film capacitors. The novel method qualitatively correctly rates the performances of the known capacitors. The method relies on various electronic-structure simulations and potential landscape explorations. The reported advances open an impressive avenue to computationally probe thousands of hypothetical capacitor designs and boost engineering practices.
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Affiliation(s)
- Nadezhda A Andreeva
- Peter the Great St. Petersburg Polytechnic University, Saint Petersburg, Russia.
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Ghazoyan HH, Grigoryan ZL, Markarian SA, Chaban VV. Dimethyl Sulfoxide Heavily Extends Homogeneous Regions of the Propionitrile/DMSO/Water Mixtures. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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3
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Excited-state proton transfer reaction of a pyrenylurea derivative in the ionic liquid 1-ethyl-3-methylimidazolium acetate. Chem Phys Lett 2023. [DOI: 10.1016/j.cplett.2023.140342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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4
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Performance of supported metal catalysts in the dimethyl carbonate production by direct synthesis using CO2 and methanol. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101721] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Tan L, Zhu J, Zhou M, He X, Zhang S. The effect of imidazolium and phosphonium ionic liquids on toluene absorption studied by a molecular simulation. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112054] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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In-situ capturing of fluorine with CaO for accelerated defluorination roasting of lepidolite in a fluidized bed reactor. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.05.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Wang X, Jing Y, Liu H, Yao Y, Shi C, Xiao J, Wang S, Jia Y. Extraction of lithium from salt lake brines by bis[(trifluoromethyl)sulfonyl]imide-based ionic liquids. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.07.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Okoromoba OE, Li Z, Robertson N, Mashuta MS, Couto UR, Tormena CF, Xu B, Hammond GB. Achieving regio- and stereo-control in the fluorination of aziridines under acidic conditions. Chem Commun (Camb) 2018; 52:13353-13356. [PMID: 27782265 DOI: 10.1039/c6cc07855a] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We developed an efficient fluorination protocol that converts easily accessible aziridines into β-fluoroamines, which are important motifs in biologically active molecules. In contrast with traditional fluorination approaches, DMPU-HF has shown both higher reactivity and regioselectivity and good functional group tolerance; thus, a wide scope of β-fluoroamines can now be accessed conveniently. The stereochemical behavior of the ring opening depends on the substitution pattern of the aziridine substrate.
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Affiliation(s)
- Otome E Okoromoba
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA.
| | - Zhou Li
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA.
| | - Nicole Robertson
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA.
| | - Mark S Mashuta
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA.
| | - Uenifer R Couto
- Institute of Chemistry, University of Campinas, São Paulo 13083-970, Brazil.
| | - Cláudio F Tormena
- Institute of Chemistry, University of Campinas, São Paulo 13083-970, Brazil.
| | - Bo Xu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 2999 North Renmin Lu, Shanghai 201620, China.
| | - Gerald B Hammond
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA.
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Vieira MO, Monteiro WF, Ligabue R, Seferin M, Chaban VV, Andreeva NA, do Nascimento JF, Einloft S. Ionic liquids composed of linear amphiphilic anions: Synthesis, physicochemical characterization, hydrophilicity and interaction with carbon dioxide. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.06.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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The evaluation and validation of copper (II) force field parameters of the Auxiliary Activity family 9 enzymes. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.04.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Khalili B, Rimaz M. Does interaction between an amino acid anion and methylimidazolium cation lead to a nanostructured ion pairs of [Mim][AA] as an ionic liquid? J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.077] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bernard FL, Polesso BB, Cobalchini FW, Donato AJ, Seferin M, Ligabue R, Chaban VV, do Nascimento JF, Dalla Vecchia F, Einloft S. CO2 capture: Tuning cation-anion interaction in urethane based poly(ionic liquids). POLYMER 2016. [DOI: 10.1016/j.polymer.2016.08.095] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Huang HL, Huang HH, Wei YJ. Chemical structure of extracted copper from scrap Cu/ITO thin films in a room temperature ionic liquid containing iodine/iodide. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.04.049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Solvation of the morpholinium cation in acetonitrile. Effect of an anion. J Mol Model 2016; 22:26. [DOI: 10.1007/s00894-015-2896-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 12/21/2015] [Indexed: 10/22/2022]
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Chevrot G, Fileti EE, Chaban VV. Enhanced stability of the model mini-protein in amino acid ionic liquids and their aqueous solutions. J Comput Chem 2015; 36:2044-51. [PMID: 26250927 DOI: 10.1002/jcc.24042] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 07/10/2015] [Accepted: 07/15/2015] [Indexed: 01/15/2023]
Abstract
Using molecular dynamics simulations, the structure of model mini-protein was thoroughly characterized in the imidazolium-based amino acid ionic liquids and their aqueous solutions. Complete substitution of water by organic cations and anions further results in hindered conformational flexibility of the mini-protein. This observation suggests that amino acid-based ionic liquids are able to defend proteins from thermally induced denaturation. We show by means of radial distributions that the mini-protein is efficiently solvated by both solvents due to a good mutual miscibility. Amino acid-based anions prevail in the first coordination sphere of positively charged sites of the mini-protein whereas water molecules prevail in the first coordination sphere of negatively charged sites of the mini-protein.
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Affiliation(s)
- Guillaume Chevrot
- Department of Physics, Chemistry and Pharmacy, MEMPHYS-Center for Biomembrane Physics, University of Southern Denmark, Campusvej 55, Odense, 5230, Denmark
| | - Eudes Eterno Fileti
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, 12231-280, São José dos Campos, São Paulo, Brazil
| | - Vitaly V Chaban
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo, 12231-280, São José dos Campos, São Paulo, Brazil
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Chaban VV, Prezhdo OV. Are Fluorination and Chlorination of Morpholinium-Based Ionic Liquids Favorable? J Phys Chem B 2015; 119:9920-4. [DOI: 10.1021/acs.jpcb.5b05121] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vitaly V. Chaban
- Instituto
de Ciência e Tecnologia, Universidade Federal de São Paulo, 12231-280 São José dos Campos, SP Brazil
| | - Oleg V. Prezhdo
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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