Free energy, entropy and heat capacity of the hydrophobic interaction as a function of pressure

Article Abstract:

Molecular dynamics simulations of a methane pair in water are used to calculate the thermodynamic properties of the hydrophobic interaction as a function of pressure. The results reveal two important characteristics of the hydrophobic effect, the large entropy decrease and the large heat capacity increase, are lost at pressures around 5 kbar. It is concluded that the free energy, volume and entropy changes are consistent with the corresponding changes for the pressure denaturation of proteins.

Usage, Molecular dynamics, Thermodynamics

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Anomalous preservation of pure methane hydrate at 1 atm

Article Abstract:

The controlled decomposition and phase stability of methane at one atm on pure, polycrystalline methane hydrate, over the temperature range of 193-200 K, as it dissociates to methane gas and water is described. The results show the dependency of methane hydrate stability on its pressure-temperature-time (P-T-t) path before and during the dissociation process.

Observations, Dissociation, Dissociation reactions, Atomic properties

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Dissociation conditions of methane hydrate in mesoporous silica gels in wide ranges of pressure and water content

Article Abstract:

The temperature of methane hydrate dissociation in silica mesopores is monitored within a wide range f pressures from 10 MPa to 1 GPa. It is concluded that the shape of hydrate particles replicates a host space of pores and may have a complex shape.

Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Silica, Hydrates, Silicon dioxide

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