Edwin E. Tucker

Vapor pressure studies of hydrophobic interactions. formation of benzene-benzene and cyclohexane-cyclohexanol dimers in dilute aqueous solution

AbstractA new, highly sensitive vapor pressure apparatus has been used to study very dilute solutions of benzene, of cyclohexane, and of mixtures of cyclohexane and cyclohexanol in water at temperatures from 15 to 45°C. The results have been used to calculate the enthalpy, free energy, and heat capacity of transfer of benzene and of cyclohexane from the vapor phase into water at infinite dilution. Values of the equilibrium constant and the enthalpy change have been determined for the reactions(A)

Study of the stability of 1:1 complexes between aliphatic alcohols and β-cyclodextrins in aqueous solution

2{\text{ benzene = (benzene)}}_{\text{2}}

Solubilization of hydrocarbons by surfactant micelles and mixed micelles

and(B)

Use of polyelectrolyte-surfactant complexes in colloid-enhanced ultrafiltration

{\text{cyclohexane + cyclohexanol = cyclohexane }} \cdot {\text{ cyclohexanol}}

Use of visible spectral displacement method to determine the concentration of surfactants in aqueous solution

occurring in dilute aqueous solution. Of particular interest is the result that the enthalpy of dimerization is positive for the two association reactions [4.0±1.0 kcal-mol−1 for reaction (A) and 3.45±0.16 kcal-mol−1 for reaction (B) at 25°C]. The heat capacity change for reaction (B) is −61±39 cal-K−1-mol−1. The results are discussed in relation to current theories and descriptions of hydrophobic interactions.

Ion-Expulsion Ultrafiltration to Remove Chromate from Wastewater

Abstract Accurate vapor pressure-solubility data have been obtained for aqueous solutions of sodium octyl sulfate (SOS) and cyclohexane at 25°C. The results indicate a large variation in the extent of solubilization of cyclohexane by SOS as the surfactant concentration is varied from 0.09 to 0.25 M . A mass action model has been used to infer formation constants for the SOS micelle, the 1:1 complex between SOS and cyclohexane, and species in which one or more cyclohexane molecules are solubilized within the micelle. The free energy change for transferring the first cyclohexane molecule into the micelle is more negative than that for adding successive cyclohexane molecules.