By K.L. Mittal, Dinesh O. Shah
Investigates the position and dynamics of surfactants and their resolution homes. deals the newest examine and advancements within the figuring out of surfactant habit in options.
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Additional resources for Adsorption and Aggregation of Surfactants in Solution
The residual oil in the porous media in which it is trapped. Once mobilized by an ultralow interfacial tension, the oil ganglia must coalesce to form a continuous oil bank. The coalescence of oil droplets has been shown to be enhanced by a very low interfacial viscosity in the system. The incorporation of these two critical factors into a suitable surfactant system for oil recovery was crucial in developing the surfactant–polymer ﬂooding process for enhanced oil recovery from petroleum reservoirs.
Molecular Interactions at Interfaces 27 adsorbed on Lewis acid sites. 8). Nonionic PAA was found to adsorb onto hematite and alumina but not onto silica at pH 3. Adsorption experiments were not conducted above pH 3 because PAA becomes ionized and the adsorption is dominated by electrostatic interactions. Having developed the fundamental knowledge base on the role of surface molecular architecture in polymer adsorption and the surface site–polymer functional group correlation, the next logical step was to use these fundamentals in ‘‘real’’ particulate systems, which contain heterogeneous surfaces with impurities that in some cases may foil selective adsorption schemes.
Figure 19 shows scanning electron microscope (SEM) images of sintered pellets produced by the two methods. It is evident that the pellets prepared from the nanoparticles produced by the microemulsion method showed 30–100 times larger grain size, less porosity, and higher density as compared with the samples prepared by conventional precipitation of aqueous solutions of these salts. A possible explanation for these effects is that nanoparticles, because of their extremely small size and large surface area, can disintegrate very quickly and allow diffusion of atoms to the site of the growing grains to support the growth process of the grains.