The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter
The critical point affects the coexistence behavior of the vapor-liquid equilibrium densities. The length of the critical influence zone is under debate because for some properties, like shear viscosity, the extension is only a few degrees, while for others, such as the density order parameter, the...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | Advances in Condensed Matter Physics |
| Online Access: | http://dx.doi.org/10.1155/2015/258601 |
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| author | Jose Luis Rivera Homero Nicanor-Guzman Roberto Guerra-Gonzalez |
| author_facet | Jose Luis Rivera Homero Nicanor-Guzman Roberto Guerra-Gonzalez |
| author_sort | Jose Luis Rivera |
| collection | DOAJ |
| description | The critical point affects the coexistence behavior of the vapor-liquid equilibrium densities. The length of the critical influence zone is under debate because for some properties, like shear viscosity, the extension is only a few degrees, while for others, such as the density order parameter, the critical influence zone covers up to hundreds of degrees below the critical temperature. Here we show that, for ethane, the experimental critical influence zone covers a wide zone of tens of degrees (below the critical temperature) down to a transition temperature, at which the apparent critical influence zone vanishes, and the transition temperature can be predicted through a pressure analysis of the coexisting bulk liquid phase, using a simple molecular potential. The liquid phases within the apparent critical influence zone show low densities, making them behave internally like their corresponding vapor phases. Therefore, Molecular Dynamics simulations reveal that the experimentally observed wide extension of the critical influence zone is the result of a vapor-like effect due to low bulk liquid phase densities. |
| format | Article |
| id | doaj-art-8bb2515509ee4c1b895ca0a343e2026f |
| institution | Kabale University |
| issn | 1687-8108 1687-8124 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Condensed Matter Physics |
| spelling | doaj-art-8bb2515509ee4c1b895ca0a343e2026f2025-02-03T01:21:37ZengWileyAdvances in Condensed Matter Physics1687-81081687-81242015-01-01201510.1155/2015/258601258601The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order ParameterJose Luis Rivera0Homero Nicanor-Guzman1Roberto Guerra-Gonzalez2Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, 58000 Morelia, MICH, MexicoFacultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, 58000 Morelia, MICH, MexicoFacultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, 58000 Morelia, MICH, MexicoThe critical point affects the coexistence behavior of the vapor-liquid equilibrium densities. The length of the critical influence zone is under debate because for some properties, like shear viscosity, the extension is only a few degrees, while for others, such as the density order parameter, the critical influence zone covers up to hundreds of degrees below the critical temperature. Here we show that, for ethane, the experimental critical influence zone covers a wide zone of tens of degrees (below the critical temperature) down to a transition temperature, at which the apparent critical influence zone vanishes, and the transition temperature can be predicted through a pressure analysis of the coexisting bulk liquid phase, using a simple molecular potential. The liquid phases within the apparent critical influence zone show low densities, making them behave internally like their corresponding vapor phases. Therefore, Molecular Dynamics simulations reveal that the experimentally observed wide extension of the critical influence zone is the result of a vapor-like effect due to low bulk liquid phase densities.http://dx.doi.org/10.1155/2015/258601 |
| spellingShingle | Jose Luis Rivera Homero Nicanor-Guzman Roberto Guerra-Gonzalez The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter Advances in Condensed Matter Physics |
| title | The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter |
| title_full | The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter |
| title_fullStr | The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter |
| title_full_unstemmed | The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter |
| title_short | The Intramolecular Pressure and the Extension of the Critical Point’s Influence Zone on the Order Parameter |
| title_sort | intramolecular pressure and the extension of the critical point s influence zone on the order parameter |
| url | http://dx.doi.org/10.1155/2015/258601 |
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