Alkane films on water: stability and wetting transitions

作者：Boinovich L B^*; Emel'yanenko A M

来源：Russian Chemical Bulletin, 2008, 57(2): 263-273.

DOI：10.1007/s11172-008-0041-8

• surface forces
• van der Waals interactions
• image forces
• wetting films
• contact angles
• pentane
• hexane
• heptane

Types of surface forces determining the disjoining pressure isotherms of wetting films of low-molecular-weight alkanes on water surface are discussed. The van der Waals forces in alkane interlayers at different temperatures were calculated using a combination of exact equations of the Dzyaloshinsky-Lifshitz-Pitaevsky macroscopic theory and the multi-oscillator model for representation of the dielectric permittivity spectra of contacting bodies. Taking account of competitive action of the van der Waals and image forces allows one not only to reproduce specific features of wetting in the systems studied at different temperatures, but also to describe quantitatively the contact angles and the experimentally observed isotherms of polymolecular adsorption. The experimentally detected wetting transition in the water-pentane-vapor system was rationalized using the results of calculations mentioned above and the Derjaguin-Frumkin theory of wetting.

• 出版日期2008-2