ON THE ORIGIN OF THE HIGH DENSITY OF LIQUID CYCLOHEXANE
A. V. Anikeenko, N. N. Medvedev
Keywords: molecular dynamics, structure of simple liquids, molecular liquids, liquid alkanes
Pages: 513-519
Abstract
Cyclohexane and 2,3-dimethylbutane molecules are the most compact among saturated С6-hydrocarbons. They have a similar size and are arranged in the liquid phase like atoms in simple liquids. However, the cyclohexane density is higher approximately by 20% than that of 2,3-dimethylbutane. The reasons of this distinction are discussed. It can be explained within the concepts of the physics of simple liquids. According to them, a small variation of the radius of a particle hard core or the pair interaction energy can lead to appreciable changes in the structure and density of a liquid. The obtained results give grounds to discard the explanations based exclusively on the features of the shape of the given molecules.
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