Kun Wang, Gui-wu Lu, Guang-gang Zhou, Hong-wang Yang, Dong-dong Su. Molecular Dynamics Study on Microstructure of Potassium Dihydrogen Phosphates Solution[J]. Chinese Journal of Chemical Physics , 2010, 23(2): 160-164. doi: 10.1088/1674-0068/23/02/160-164
Citation: Kun Wang, Gui-wu Lu, Guang-gang Zhou, Hong-wang Yang, Dong-dong Su. Molecular Dynamics Study on Microstructure of Potassium Dihydrogen Phosphates Solution[J]. Chinese Journal of Chemical Physics , 2010, 23(2): 160-164. doi: 10.1088/1674-0068/23/02/160-164

Molecular Dynamics Study on Microstructure of Potassium Dihydrogen Phosphates Solution

doi: 10.1088/1674-0068/23/02/160-164
Funds:  This work was supported by the Key Project from Education Ministry of China (No.108023).
  • Received Date: 2009-10-13
  • Molecular dynamics simulations were carried out to study the internal energy and microstruc-ture of potassium dihydrogen phosphates (KDP) solution at different temperatures. The water molecule was treated as a simple-point-charge model, while a seven-site model for the dihydrogen phosphate ion was adopted. The internal energy functions and the radial dis-tribution functions of the solution were studied in detail. An unusually large local particle number density fluctuation was observed in the system at saturation temperature. It has been found that the specific heat of oversaturated solution is higher than that of unsaturated solution, which indicates the solution experiences a crystallization process below saturation temperature. The radial distribution function between the oxygen atom of water and the hydrogen atom of the dihydrogen phosphate ion shows a very strong hydrogen bond struc-ture. There are strong interactions between potassium cation and oxygen atom of dihydrogen phosphate ion in KDP solution, and much more ion pairs were formed in saturated solution.
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Molecular Dynamics Study on Microstructure of Potassium Dihydrogen Phosphates Solution

doi: 10.1088/1674-0068/23/02/160-164
Funds:  This work was supported by the Key Project from Education Ministry of China (No.108023).

Abstract: Molecular dynamics simulations were carried out to study the internal energy and microstruc-ture of potassium dihydrogen phosphates (KDP) solution at different temperatures. The water molecule was treated as a simple-point-charge model, while a seven-site model for the dihydrogen phosphate ion was adopted. The internal energy functions and the radial dis-tribution functions of the solution were studied in detail. An unusually large local particle number density fluctuation was observed in the system at saturation temperature. It has been found that the specific heat of oversaturated solution is higher than that of unsaturated solution, which indicates the solution experiences a crystallization process below saturation temperature. The radial distribution function between the oxygen atom of water and the hydrogen atom of the dihydrogen phosphate ion shows a very strong hydrogen bond struc-ture. There are strong interactions between potassium cation and oxygen atom of dihydrogen phosphate ion in KDP solution, and much more ion pairs were formed in saturated solution.

Kun Wang, Gui-wu Lu, Guang-gang Zhou, Hong-wang Yang, Dong-dong Su. Molecular Dynamics Study on Microstructure of Potassium Dihydrogen Phosphates Solution[J]. Chinese Journal of Chemical Physics , 2010, 23(2): 160-164. doi: 10.1088/1674-0068/23/02/160-164
Citation: Kun Wang, Gui-wu Lu, Guang-gang Zhou, Hong-wang Yang, Dong-dong Su. Molecular Dynamics Study on Microstructure of Potassium Dihydrogen Phosphates Solution[J]. Chinese Journal of Chemical Physics , 2010, 23(2): 160-164. doi: 10.1088/1674-0068/23/02/160-164

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