Calculation of the surface potential and surface charge density by measurement of the three-phase contact angle

Detection of ion adsorption at solid–liquid interfaces using internal reflection ellipsometry

“…At pH 3, silica surfaces are essentially uncharged because this is close to the point of zero charge [30]. At pH 10, the silanol groups are largely deprotonated and the silica surface carries a negative charge [31]. To compensate this charge, cations need to adsorb to the interfaces.…”

Derivation of a pH Dependent Solid-Liquid Interfacial Tension and Theoretical Interpretation of the Physicochemistry of Dewetting in the CO2-Brine-Silica System

“…33and Eq. (36)) , developed in our studies, using surface charge and surface potential dependence on aqueous solution pH theoretically explain the coupling of the thermodynamic contact angle to surface potential and surface charge density (Horiuchi et al, 2012).. Therefore, our models ((Eq.…”

“…8shows that the surface charge density, positive below the point of zero charge pH and negative above the point of zero charge pH, is pH dependent (Kosmulski , 2011). Also, by electrostatic theory, a given surface charge density will give rise to a surface potential (Horiuchi, et al, 2012).…”

Measuring Electric Charge and Molecular Coverage on Electrode Surface from Transient Induced Molecular Electronic Signal (TIMES)

“…Because of the importance of surface charge density to surface chemistry, extensive molecular dynamic simulations have been performed to calculate the surface charge density for solutions of different ionic composition and pH value 3,4 ; and many attempts have been made to experimentally measure this and other related quantities 5,6 . So far atomic force microscopy (AFM) 7–11 , surface plasmonic resonance 12,13 , streaming potential 14–18 , and contact angle titration 19–21 are among the most studied techniques that can produce information related to the surface charge density although none of the existing methods, to our best knowledge, can easily and directly measure the polarity and amount of surface charge in the natural environment where surface reactions take place.…”

“…Hence the streaming potential technique is more suitable for comparing surface properties between different surface modifications and studying zeta potential dependence on pH value and ionic strength of the solution 15,16 . In addition to the above methods, people have also measured contact angles to determine the surface charge density at the liquid/solid interface 19–21 . By combining the Young-Lippmann equation with the Guoy-Chapman model for electrical double layer, the dependence of surface potential and surface charge density on the solution pH value has been studied 19 .…”