Wetting of solids

The basic mechanism for surfactants to enhance solubility and dissolution is the ability of surface-active molecules to aggregate and form micelles [35], While the mathematical models used to describe surfactant-enhanced dissolution may differ, they all incorporate micellar transport. The basic assumption underlying micelle-facilitated transport is that no enhanced dissolution takes place below the critical micelle concentration of the surfactant solution. This assumption is debatable, since surfactant molecules below the critical micelle concentration may improve the wetting of solids by reducing the surface energy. 

The wetting of solid surfaces is very apparent when considering the difference between Teflon and metal surfaces. To understand the degree of wetting between the liquid, L, and the solid, S, it is convenient to rewrite Equation 5.3 as follows ... 

Effect of Wetting of Solids by the Polymer. Much work has been done on the effect of a filler on a rubbery material, using materials... 

Mixing The reorientation of particles relative to one another to achieve uniformity or randomness. This process can include wetting of solids by a liquid phase, dispersion of discrete particles, or deagglomeration into a continuous phase. Heating and cooling via indirect conduction may be used in this operation to facilitate phase mixing or stabilization. 

Zettlemoyer, A.C., 1965. Immersional wetting of solid surfaces. Industrial and Engng. Chemistry, 57 27-36. 

Surface and interfacial energy are important because of their controlling influence on such practical applications as spinning, polymer adhesion, and stability of dispersions and wetting of solids by liquids. 

Ishimov, V. I., Hlinov, V. V. and Esin, O. A. (1971) in Kinetics of Wetting of Solid Oxides by Liquid Metals / Physical Chemistry of Surface Phenomena in Melts, Kiev, Naukova Dumka, p. 213 (in Russian)... 

Zisman critical surface tension of wetting of solid (aj,... 

In chocolate coating, the liquid phase is an oil (cocoa butter). The addition of lecithin aids the wetting of solid cocoa particles by this oil, most probably by lowering This lowers the viscosity of the heterogenous mass as well as giving a smoother mouthfeel to the final product. 

The wetting of solid surfaces by liquids has been studied for many years, both theoretically and experimentally. Useful reviews of this work include those by de Gennes [1], Dietrich [2], Adamson (Chapters 10, 13, and 16 in [3]), and Sullivan and Telo de Gama [4]. Before beginning a discussion of this phenomenon in the case of vapors condensed onto solid carbons, it is helpful to summarize some general features of wetting. Thus, the characteristics of the wetting of solids by liquids will be briefly described in this introductory section, to be followed by a discussion of some of the experimental and simulation studies of vapors on carbon surfaces. 

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