Wettability of water-how is it? Gel by definition contains water. If it is dried, it becomes a sol. For sols, you can determine the zeta potential. The zeta potential characterizes fine particles in a dispersed system. Wetability characterizes the surface of macrophase or dry powder. It is impossible to measure the wettability of nanoparticles in an already existing disperse system. Therefore, as you can see, there is no connection of the zeta potential and wettability.

thanks Dr. Yuri.

Sorry for a late answer - I saw your question at random. Further to Yuri's answer, you can measure zeta potential of surfaces from streaming potential measurements, it is not just a property of dispersed particles. I'm not sure you can determine wettability from the zeta potential, but the two in combination are pretty useful for understanding what is happening at a surface. Can't you measure the wettability of your gel directly?

Hi Hesamoddin Rabiee !

The relationship between zeta potential and water wettability has been discussed by various authors, such as:

Bassioni and Taqvi (2015), "Wettability Studies Using Zeta Potential Measurements"

Taqvi and Bassioni (2019), "Understanding Wettability through Zeta Potential Measurements"

Collini et al (2020), "Zeta potential in intact carbonates at reservoir conditions and its impact on oil recovery during controlled salinity waterflooding"

Current understanding of the literature suggests that generally when the absolute value of zeta potential, in the presence of brine only, is higher than 30 mV, it is considered to be water-wet and hence more recovery is anticipated. However, there is no absolute correct value. It can be compared among two different brines also. I hope my answer would help in your research. Please feel free to contact me for further discussion. Thanks.

Faisal Ur Rahman Awan In your recommended 2019 article, the phenomenon of wettability without proof equates to zeta potential.

Daniel James Johnson The gel cannot be wetted with water as it contains water. The wettability of the xerogel or otherwise dried gel can be determined.