Influence of weak microwaves on spatial collision and energy distribution of water molecules

Gou, Dezhi; Liu, Ying; Shi, Hongxiao

doi:10.1016/j.chemphys.2020.110977

Cited by 15 publications

(5 citation statements)

References 57 publications

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“…This study sheds light on the relationship between several MW parameters, such as the output watts, and several mineralization peptide parameters, such as the amount of precipitation. In future studies, we will use computational chemistry to investigate the direct relationship among MWs, peptide sequences and mineralization 25 , 26 and compare them to wet experimental results. Our findings may aid in the treatment of teeth and bones and the development of organic–inorganic nanobiomaterials.…”

Section: Discussionmentioning

confidence: 99%

Effect of linearly polarized microwaves on nanomorphology of calcium carbonate mineralization using peptides

Usui

Ozaki

Hirao

et al. 2023

Sci Rep

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Microwaves are used for diverse applications such as mobile phones, ovens, and therapy devices. However, there are few reports on the effects of microwaves on diseases other than cancer, and on physiological processes. Here, we focused on CaCO3 mineralization as a model of biomineralization and attempted to elucidate the effect of microwaves on CaCO3 mineralization using peptides. We conducted AFM, ζ potential, HPLC, ICP-AES, and relative permittivity measurements. Our findings show that microwaves alter the nanomorphology of the CaCO3 precipitate, from sphere-like particles to string-like structures. Furthermore, microwaves have little effect on the mineralization when the mineralization ability of a peptide is high, but a large effect when the precipitation ability is low. Our findings may be applicable to not only the treatment of teeth and bones but also the development of organic–inorganic nanobiomaterials. This methodology can be expanded to other molecular/atomic reactions under various microwave conditions to alter reaction activity parameters.

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Section: Discussionmentioning

confidence: 99%

Effect of linearly polarized microwaves on nanomorphology of calcium carbonate mineralization using peptides

Usui

Ozaki

Hirao

et al. 2023

Sci Rep

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“…In addition, microwaves can change the spatial conformation between peptides and solvent molecules by weakening the hydrogen bond interactions . The essence of the above results is the interactions between polar molecules and microwave fields. , Our previous work has reported that microwave polarization can change the spatial collision probability of water molecules in the direction of the electric field and the energy distributions, where the fraction of intermediate energy molecules increases while the fraction of high-energy molecules decreases . In this study, the spatial orientation and kinetic energy of reactive site collision between reactants in chemical reaction under microwave irradiation will be further researched.…”

Section: Introductionmentioning

confidence: 88%

“…Experiments have provided substantial evidence for the existence of the microwave nonthermal effect. As for a theoretical research, the physical mechanism of the microwave nonthermal effect is also being further understood and improved. − Early, a reliable viewpoint about the microwave nonthermal effect is that microwave can speed up the overall reaction rate by promoting the diffusion of reactant molecules . Then, the effective intramolecular potential energy surface under the action of microwave field shows that the nonthermal effect caused by potential distortion exists in the intramolecular reaction .…”

Section: Introductionmentioning

confidence: 99%

Investigation of Spatial Orientation and Kinetic Energy of Reactive Site Collision between Benzyl Chloride and Piperidine: Novel Insight into the Microwave Nonthermal Effect

et al. 2022

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Microwave nonthermal effect in chemical reactions is still an uncertain problem. In this work, we have studied the spatial orientation and kinetic energy of reactive site collision between benzyl chloride and piperidine molecules in substitution reaction under microwave irradiation using the molecular dynamics simulation. Our results showed that microwave polarization can change the spatial orientation of reactive site collision. Collision probability between the Cl atom of the C–Cl group of benzyl chloride and the H atom of the N–H group of piperidine increased by up to 33.5% at an effective spatial solid angle (θ, φ) of (100∼110°, 170∼190°) under microwave irradiation. Also, collision probability between the C atom of the C–Cl group of benzyl chloride and the N atom of the N–H group of piperidine also increased by up to 25.6% at an effective spatial solid angle (θ, φ) of (85∼95°, 170∼190°). Moreover, the kinetic energy of collision under microwave irradiation was also changed, that is, for the collision between the Cl atom of the C–Cl group and the H atom of the N–H group, the fraction of high-energy collision greater than 6.39 × 10–19 J increased by 45.9 times under microwave irradiation, and for the collision between the C atom of the C–Cl group and the N atom of the N–H group, the fraction of high-energy collision greater than 6.39 × 10–19 J also increased by 29.2 times. Through simulation, the reaction rate increased by 34.4∼50.3 times under microwave irradiation, which is close to the experimental increase of 46.3 times. In the end, spatial orientation and kinetic energy of molecular collision changed by microwave polarization are summarized as the microwave postpolarization effect. This effect provides a new insight into the physical mechanism of the microwave nonthermal effect.

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“…The essence of the microwave nonthermal effect is the effect of polar molecules under microwave polarization which has nothing to do with thermal effect. Before this, we have found that microwaves can change the spatial collision direction and energy distribution of water molecules . Under the microwave polarization, the collision probability along the electric field direction increases by 5%, and the proportion of molecules with higher collision energy decreases by 6%.…”

Section: Introductionmentioning

confidence: 96%

“…Before this, we have found that microwaves can change the spatial collision direction and energy distribution of water molecules. 18 Under the microwave polarization, the collision probability along the electric field direction increases by 5%, and the proportion of molecules with higher collision energy decreases by 6%. Then, we also investigated the influence of microwaves on chemical reactions and found that microwaves also can change the collision orientation and kinetic energy of reactive site between benzyl chloride and piperidine.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Research of Spatial Orientation and Kinetic Energy of Active Site Collision of Carnosine under Weak Microwave Irradiation

et al. 2022

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The molecular mechanism of the microwave nonthermal effect is still not clear. This work investigated the spatial orientation and kinetic energy of active site collision of carnosine, a natural bioactive dipeptide, under the weak microwave irradiation using the molecular dynamics simulation. Our results showed the influences of the temperature, microwave intensity, microwave frequency, and microwave polarization mode (linear polarization and circular polarization) on the spatial orientation and kinetic energy of active site collision of carnosine. First, under the constant intensity and frequency of linear polarization microwave irradiation, the increment of the collision probability between the 6N atom of carnosine and the 28H atom of the other carnosine at effective space angle decreases from 85.0% to 3.5% with increasing temperature. Second, with the increase of microwave intensity, the change of spatial orientation and kinetic energy becomes more and more significant. However, the change of circular polarization microwaves on the spatial orientation and kinetic energy of collision is weaker than that of linear polarization. Third, under the constant intensity of linear polarization microwave irradiation, the collision probability between the 6N atom and the 28H atom at effective space angle decreases from 70.2% to 14.7% with increasing frequency. Finally, under the microwave polarization, the spatial orientation and kinetic energy of molecular collision are changed, which is summarized as the microwave postpolarization effect (MWPPE). The dependence of MWPPE on temperature, microwave intensity, microwave frequency, and polarization mode is very complicated. In the end, this effect can provide a new insight into the molecular mechanism of the microwave nonthermal effect.

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Influence of weak microwaves on spatial collision and energy distribution of water molecules

Cited by 15 publications

References 57 publications

Effect of linearly polarized microwaves on nanomorphology of calcium carbonate mineralization using peptides

Effect of linearly polarized microwaves on nanomorphology of calcium carbonate mineralization using peptides

Investigation of Spatial Orientation and Kinetic Energy of Reactive Site Collision between Benzyl Chloride and Piperidine: Novel Insight into the Microwave Nonthermal Effect

Molecular Dynamics Research of Spatial Orientation and Kinetic Energy of Active Site Collision of Carnosine under Weak Microwave Irradiation

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