Naslov
Charging of solid surface/aqueous interface: Surface potential measurements

Autori
Preočanin, Tajana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Workshop “Innovative surfaces and materials”

Mjesto i datum
Primošten, Hrvatska, 28.08.2016. - 31.08.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Electrical interfacial layer ; surface charging ; surface potential measurements ; colloid particles

Sažetak
Electrostatic potential at the inner surface plane is the consequence of the charge (ion/electron) transfer at the electrical interfacial layer and is therefore one of the main parameters characterizing the interface [1]. Inner surface potential could be measured by Single Crystal Electrodes (SCrE) [2] and provide information on the state of charged groups bound to the surface. In addition, together with adsorption and electrokinetic data, inner surface potential may serve in evaluation of equilibrium parameters. For some metal oxide crystal planes the measured surface potential and electrokinetic potential give unexpected results [3]. While the measured inner surface potential is zero, the electrokinetic measurements for the same particular crystal plane provide a higher (absolute) values of the zeta potential. This finding could be explained by considering the pH dependent charging of the interfacial water layer via protonation or deprotonation, resulting in the presence of physically adsorbed hydronium or hydroxide ions. While the pH of the electrolyte solution affects the electrokinetic behavior but not the surface potential, the specific adsorption of strongly bound ions to oxide surfaces affect both the inner surface and zeta-potentials. The SCrE is the framework to study the more complex, environmentally significant, charge transfers occurring at the charged interfaces.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA