Temperature dependence of the excess volumes of binary mixtures containing cyclohexane + some higher n-alkanes

Article Abstract:

Temperature dependence has been studied in excess volumes of binary mixtures containing cyclohexane and some higher n-alkanes. Seven temperatures in the 283.15-313.15 K range were made at atmospheric pressure. A regular negative pattern was found for each of the three sets of the binary system involving cyclohexane with n-dodecane, n-tetradecane and n-hexadecane. Progogine-Flory-Patterson theory has been used for calculation of three types of contributions, free volume, interactional, and internal pressure.

Egypt, Observations, Alkanes, Cyclohexane

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Self-assembling capsules

Article Abstract:

Solvation effects or nucleation by guests were found to control the behavior and functions of molecular assemblies. The energetics of the complexes invariably pit intermolecular forces such as, the van der Waals interactions and hydrogen bonds host against the decreased freedom of the included guest. It was observed that special entropic effects resulted when one solvent molecule is present in the capsules and is displaced by the guest molecule.

Hydrogen bonding, Hydrogen bonds, Nucleation, Nucleation (Chemistry)

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Optical absorption spectrum of solvated electrons in pure tert-butanol: effect of temperature

Article Abstract:

The optical absorption of solvated electrons in pure tert-butanol decreases as the temperature of the solvent rises, due to a decrease in free ion yield and in the dielectric permittivity of the solvent. The value of the energy at the absorption maximum, E(sub)Amax, at 299 degrees K is 155 zJ and, at 338 degrees K, is 112 zJ.

Butanol, Tertiary butyl alcohol, Photoabsorption

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