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Acta Phys. Chim. Sin.  2011, Vol. 27 Issue (12): 2779-2785    DOI: 10.3866/PKU.WHXB20112779
Car-Parrinello Molecular Dynamics Simulations of Microstructure Properties of Liquid Water, Methanol and Ethanol
ZENG Yong-Ping, ZHU Xiao-Min, YANG Zheng-Hua
College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu Province, P. R. China
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Abstract  Car-Parrinello molecular dynamics (CPMD) calculations were performed on the solvent structure properties of water, methanol, and ethanol. The results show that the first O…O peaks of the radial distribution functions (RDFs) in the three systems are 0.278 nm for water, 0.276 nm for methanol, and 0.275 nm for ethanol. The first O…H peaks of the radial distribution functions (RDFs) in the three systems are at 0.178 nm for water, 0.176 nm for methanol, and 0.177 nm for ethanol. This indicates that the hydrophobic groupings (hydrogen, methyl, and ethyl) have little influence on the first peak position. However, the intensity of the RDFs increases from water to methanol and ethanol. The spatial distribution functions show that the oxygen and hydrogen atoms of other solvent molecules have characteristic orientations on the reference molecules in these systems. The results are in agreement with the first sharp peak of the radial distribution functions. We analyzed the hydrogen bonds using a statistical method. The results show that the average hydrogen bond numbers are 3.62 for water, 1.99 for methanol, and 1.87 for ethanol. Therefore, different hydrogen-bonded network structures are formed for liquid water, methanol, and ethanol via hydrogen bonds.

Key wordsWater      Methanol      Ethanol      CPMD      Microstructure     
Received: 02 August 2011      Published: 06 September 2011
MSC2000:  O645  

The project was supported by the National Natural Science Foundation of China (20806064).

Corresponding Authors: ZENG Yong-Ping     E-mail:
Cite this article:

ZENG Yong-Ping, ZHU Xiao-Min, YANG Zheng-Hua. Car-Parrinello Molecular Dynamics Simulations of Microstructure Properties of Liquid Water, Methanol and Ethanol. Acta Phys. Chim. Sin., 2011, 27(12): 2779-2785.

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