Interfacial properties of nonionic surfactants and decane-surfactant microemulsions at the silica-water interface. An ellipsometry and surface Force Study

Article Abstract:

The interfacial behavior of nonionic surfactants and surfactant-decane microemulsions at the silica-water interface from micellar solutions and water-rich tricomponent C(sub n)E(sub m)-decane-water microemulsions is discussed. The variations sometimes seen in force profiles measured on different glass surfaces is interpreted as being caused either by the very small changes in the interaction strength between adsorbed surfactant headgroups and the glass surface or by defects of the adsorbed layer resulting from the 'topochemical' heterogeneity of the glass surface.

Properties

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Heat capacity changes accompanying micelle formation upon burial of hydrophobic tail of nonionic surfactants

Article Abstract:

The heat of micellization deltaH(sub m) for five nonionic surfactants was measured as a function of temperature by using an isothermal titration calorimeter. The findings reveal that the heat capacity upon micellization is directly proportional to the removal of water accessible nonpolar surface area.

Industrial Gas Manufacturing, Industrial gases, Hydrogen, Electric properties, Micelles

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Comparison of the DSC curves obtained for aqueous solutions of nonionic and ionic surfactants

Article Abstract:

Interpretations of the differential scanning calorimetry (DSC) curves that are obtained for aqueous solutions of three nonionic surfactants are reported. A simple two-state model that is used to describe the data for nonionic surfactants could be used to describe similar data for ionic surfactants.

Ionic solutions, Calorimetry

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