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Chen J, Warner MJ, Sikora B, Kiddle D, Coverdell D, Allam O, Kohl PA, Jang SS. The selective heating effect of microwave irradiation on a binary mixture of water and polyethylene oxide: a molecular dynamics simulation approach. Phys Chem Chem Phys 2023; 25:12522-12531. [PMID: 37133822 DOI: 10.1039/d3cp00349c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
In this study, we investigate the molecular mechanisms of a microwave-driven selective heating process by performing molecular dynamics simulations for three different systems including pure water, pure polyethylene oxide (PEO), and water-PEO mixed systems in the presence of a microwave with two different intensities of electric field such as 0.001 V Å-1 and 0.01 V Å-1 at a frequency of 100 GHz. First, from performing molecular dynamics simulations of CO and CO2 in the presence of the microwave, it is confirmed that the molecular dipole moment is responsible for the rotational motion induced by the oscillating electric field. Second, by analyzing the MD simulations of the pure water system, we discover that the dipole moment of water exhibits a time lag with respect to the microwave. During the heating process, however, the temperature, kinetic, and potential energies increase synchronously with the oscillating electric field of the microwave, showing that the heating of the water system is caused by the molecular reaction of water to the microwave. Comparing the water-PEO mixed system to the pure water and pure PEO systems, the water-PEO mixed system has a higher heating rate than the pure PEO system but a lower heating rate than the pure water system. Therefore, we conclude that heating the water-PEO mixed system is driven by water molecules selectively activated by microwave irradiation. We also calculate the diffusion coefficients of water molecules and PEO chains by describing their mean square displacements, demonstrating that the diffusion coefficients are increased in the presence of microwaves for both water and PEO in pure and mixed systems. Lastly, during the microwave heating process, the structures of the water-PEO mixed system are altered as a function of the intensity of electric field, which is mainly driven by the response of water molecules.
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Affiliation(s)
- Junhe Chen
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, 30332-0245, USA.
| | - Matthew J Warner
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0100, USA
| | - Benjamin Sikora
- Department of Energy's Kansas City National Security Campus managed by Honeywell, 14520 Botts Road, Kansas City, MO 64147, USA
| | - Daniel Kiddle
- Department of Energy's Kansas City National Security Campus managed by Honeywell, 14520 Botts Road, Kansas City, MO 64147, USA
| | - Danielle Coverdell
- Department of Energy's Kansas City National Security Campus managed by Honeywell, 14520 Botts Road, Kansas City, MO 64147, USA
| | - Omar Allam
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, 30332-0245, USA.
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive NW, Atlanta, Georgia 30332-0405, USA
| | - Paul A Kohl
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0100, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, 30332-0245, USA.
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Wang D, Qin H, Qin Q, Liu XY, Li L. Theoretical study on degradation mechanism of ornidazole on anatase TiO2(101) and (001) surfaces. NEW J CHEM 2020. [DOI: 10.1039/c9nj05659a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The degradation mechanism of one new emerging pollutant ornidazole (ONZ) on TiO2surface is explored using DFT calculations.
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Affiliation(s)
- Danyang Wang
- College of Chemistry and Material Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Haichuan Qin
- College of Chemistry and Material Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Qiaoqiao Qin
- College of Chemistry and Material Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Xiang-Yang Liu
- College of Chemistry and Material Science
- Sichuan Normal University
- Chengdu 610068
- China
| | - Laicai Li
- College of Chemistry and Material Science
- Sichuan Normal University
- Chengdu 610068
- China
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