Enthalpy-entropy compensation in the effects of urea on hydrophobic interactions

Article Abstract:

The enthalpic and entropic contributions to the neopentane pair potentials of mean force (PMFs) and also its significance for understanding the driving forces responsible for thermodynamically favorable neopentane contact and solvent-separated distances in urea solution are discussed. The results have shown that a solute-solvent and solvent-solvent decomposition of enthalpies and entropies of solute association in solution has provided an improved atomic-scale picture of the contributions of solute-solvent interactions and an improved atomic-scale picture of molecular-scale driving forces for solute-solute association.

Observations, Thermodynamics, Chemical properties, Hydrophobic effect

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Importance of excluded volume on the solvation of urea in water

Article Abstract:

The molecular dynamics simulations are used to probe the concentration-dependent solvation of urea in water. The results suggest that urea denaturation is a subtle combination of hydrogen bond forming ability and its excluded volume, implying that the qualitative mechanism of denaturation might be similar. It proposed that the denaturation efficiency of polar nonelectrolytes, such as urea, is determined by the ability of the cosolute to form hydrogen bonds with the polypeptide chain, which depends on its size.

Analysis, Molecular dynamics, Solvation

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Effect of urea and alkylureas on micelle formation by a nonionic surfactant with short hydrophobic tail at 25 degree C

Article Abstract:

The effect of urea, N-monomethylurea, and N,N'-dimethylurea on the micellization of the nonionic ethoxylated tenside pentaethyleneglycolmonohexyl ether (C6H5) was investigated through intradiffusion coefficient measurements t 25 degree C. The presence of the additive causes an almost linear increase in the critical micellar composition, while a decrease in the aggregation number occurs.

Electric properties, Micelles, Alkyl groups

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