The molecular-level relationship between the properties of liquid water molecules and orientational order

Young In Jhon, Kyoung Tai No, Mu Shik Jhon

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The relationship between the orientational (tetrahedral) order (q) of an individual liquid water molecule and its various properties such as Voronoi volume, potential energy, kinetic energy, and nearest neighbors was thoroughly examined using molecular dynamics simulations of TIP5P model at 278, 298, and 318 K. By constructing Voronoi polyhedra (VP), we found that the average volume of water molecules classified according to q decreased monotonically as q increased, while the surface of VP increased in the range of high q. Kinetic energy was almost invariant but potential energy decreased monotonously as q increased. The volumes of molecules having a very large q increased as temperature decreased, implying a possible density maximum phenomena. Using time correlation functions, it was shown that total energy rather than potential energy was a more significant factor in the determination of the orientational order. With varying temperature, the relation between the properties of central molecules and those of nearest neighbor molecules were investigated. It required a very systematic cooperative motion to obtain LDL (low-density liquid) formed by ordering. It was supposed that density maximum phenomena should be accomplished by the growth of LDL and HDL (high-density liquid) of low quality with a consistent population of HDL and a drop of LDL of high quality as temperature lowered.

Original languageEnglish
Pages (from-to)160-166
Number of pages7
JournalFluid Phase Equilibria
Volume244
Issue number2
DOIs
Publication statusPublished - 2006 Jun 20

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Molecules
Water
Liquids
liquids
Potential energy
water
molecules
potential energy
Kinetic energy
polyhedrons
kinetic energy
Temperature
Molecular dynamics
temperature
molecular dynamics
Computer simulation
simulation
energy

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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abstract = "The relationship between the orientational (tetrahedral) order (q) of an individual liquid water molecule and its various properties such as Voronoi volume, potential energy, kinetic energy, and nearest neighbors was thoroughly examined using molecular dynamics simulations of TIP5P model at 278, 298, and 318 K. By constructing Voronoi polyhedra (VP), we found that the average volume of water molecules classified according to q decreased monotonically as q increased, while the surface of VP increased in the range of high q. Kinetic energy was almost invariant but potential energy decreased monotonously as q increased. The volumes of molecules having a very large q increased as temperature decreased, implying a possible density maximum phenomena. Using time correlation functions, it was shown that total energy rather than potential energy was a more significant factor in the determination of the orientational order. With varying temperature, the relation between the properties of central molecules and those of nearest neighbor molecules were investigated. It required a very systematic cooperative motion to obtain LDL (low-density liquid) formed by ordering. It was supposed that density maximum phenomena should be accomplished by the growth of LDL and HDL (high-density liquid) of low quality with a consistent population of HDL and a drop of LDL of high quality as temperature lowered.",
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The molecular-level relationship between the properties of liquid water molecules and orientational order. / Jhon, Young In; No, Kyoung Tai; Jhon, Mu Shik.

In: Fluid Phase Equilibria, Vol. 244, No. 2, 20.06.2006, p. 160-166.

Research output: Contribution to journalArticle

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