**4. Conclusion**

 Complete wettability profiles of charged surfaces can be generated using zeta potential measurements. Unlike the commonly employed methods, the novel technique is able to study wettability in situ alteration. In the case of calcium carbonate and crude oil, the tolerance of the reservoir rock surface was observed while transitioning from a water-wet to an oil-wet surface. In this chapter, a comprehensive insight for the mechanism of inhibition of asphaltenes by inhibitors was provided. Moreover, a detailed discussion is provided on the role of asphaltene in wettability alteration, by stating the mechanism it follows in order to form multilayer adsorption.

#### *Wettability and Interfacial Phenomena - Implications for Material Processing*

 According to literature, factors such as temperature, pressure, and pH have an effect on reservoir rock wettability. Therefore, further research can be carried out in order to study the effect of these factors on the wettability alteration process. Moreover, as the wettability study using zeta potential measurements is a novel technique, various other studies, in which traditional wettability methods were used, can be carried out with this approach. Additionally, a similar analysis can be carried out with different types of reservoir rocks, and wettability profiles can be generated.
