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- W2077615441 abstract "Most of the environmentally important processes occur at the specific hydrated mineral faces. Their rates and mechanisms are in part controlled by the interfacial electrostatics, which can be quantitatively described by the point of zero potential (PZP). Unfortunately, the PZP value of specific crystal face is very difficult to be experimentally determined. Here we show that PZP can be extracted from a single-crystal electrode potentiometric titration, assuming the stable electrochemical cell resistivity and lack of specific electrolyte ions sorption. Our method is based on determining a common intersection point of the electrochemical cell electromotive force at various ionic strengths, and it is illustrated for a few selected surfaces of rutile, hematite, silver chloride, and bromide monocrystals. In the case of metal oxides, we have observed the higher PZP values than those theoretically predicted using the MultiSite Complexation Model (MUSIC), that is, 8.4 for (0 0 1) hematite (MUSIC-predicted ∼6), 8.7 for (1 1 0) rutile (MUSIC-predicted ∼6), and about 7 for (0 0 1) rutile (MUSIC-predicted 6.6). In the case of silver halides, the order of estimated PZP values (6.4 for AgCl < 6.5 for AgBr) agrees well with sequence estimated from the silver halide solubility products; however, the halide anions (Cl−, Br−) are attracted toward surface much stronger than the Ag+ cations. The observed PZPs sequence and strong anions affinity toward silver halide surface can be correlated with ions hydration energies. Presented approach is the complementary one to the hysteresis method reported previously [P. Zarzycki, S. Chatman, T. Preočanin, K.M. Rosso, Langmuir 27 (2011) 7986–7990]. A unique experimental characterization of specific crystal faces provided by these two methods is essential in deeper understanding of environmentally important processes, including migration of heavy and radioactive ions in soils and groundwaters." @default.
- W2077615441 created "2016-06-24" @default.
- W2077615441 creator A5063969240 @default.
- W2077615441 creator A5069714764 @default.
- W2077615441 date "2012-03-01" @default.
- W2077615441 modified "2023-09-26" @default.
- W2077615441 title "Point of zero potential of single-crystal electrode/inert electrolyte interface" @default.
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- W2077615441 doi "https://doi.org/10.1016/j.jcis.2011.12.068" @default.
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