Naslov
Surface potential at ice/water interface

Autori
Preočanin, Tajana ; Čop, Ana ; Lützenkirchen, Johannes ; Kallay, Nikola

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Faraday discussion 141: Water- From Interfaces to the Bulk, Poster Abstracts / - Edinburgh : Faraday division, RCS, 2008, P35-P35

Skup
Faraday discussion 141: Water- From Interfaces to the Bulk

Mjesto i datum
Edinburgh, Ujedinjeno Kraljevstvo, 27.08.2008. - 29.08.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ice; surface potential; water; interface; electrical interfacial layer

Sažetak
Ice surface in water is charged due to exchange of protons between surface and bulk water molecules: ≡ OH2 + H3O+ → ≡ OH3+ + H2O ; Kp ≡ OH2 + H2O → ≡ OH– + H3O+ ; Kd Another possible reaction is transfer of hydronium and hydroxide ions from the bulk phase to the interface: H3O+ → ≡ OH3+ ; KH OH– → ≡ OH– ; KOH Electrokinetic measurements1 resulted in the isoelectric point of ice at pHiep ≈ 3, while potentiometric experiments1, 2 showed that surface potential Ψ 0 is lower than the Nernstian potential. The pHiep values of numerous inert materials in aqueous environment, such as oil, teflon and air, were found to be low, i.e. between 2.5 and 3.5, so that it was concluded that the similar charging mechanism takes place3. Electrokinetic and potentiometric data for ice/water are presented. Evaluation of parameters characterizing the equilibrium at aqueous solid/liquid interface is described.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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