Kinetics of dissolution of ZnO, MgO and their solid solutions in aqueous sulphuric acid solutions

Guśpiel, J.; Riesenkampf, W.

doi:10.1016/0304-386x(93)90035-c

Cited by 22 publications

(9 citation statements)

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“…The identical IEP was observed for all compositions from Sn000Zn to Sn0010Zn ( Figure 3A), which indicates no compositional changes in the surfaces, but the electric conductivity of the dispersions increases for the NP that contained ZnO ( Figure 3B). The water solubility SnO 2 is notably low 35 compared with ZnO, 53,54 which can be solubilized from the NP surfaces and increase the electrical conductibility of the dispersion. However, the IEP significantly changes for concentrations above 0.11 mol% of ZnO (Sn0010Zn) and becomes more basic (Figures 4A and 4B): the IEP changes to 6.3 and 7.6 for 4.52% and 9.12%, respectively.…”

Section: Chemical Composition Of Interfacesmentioning

confidence: 99%

Surface and grain‐boundary excess of ZnO‐doped SnO₂ nanopowders by the selective lixiviation method

2017

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The primary characteristic of nanopowders is the high surface area and consequently high fraction of atoms on the interfaces, which changes the energy of the system. The additive distribution in the nanopowder interfaces is a fundamental aspect to control the energy, particle size, and final properties of nanopowders. In this work, the surface excess was determined using a selective lixiviation method, where a low‐water‐soluble oxide, SnO2, was used as the matrix, and a high‐water‐soluble oxide, ZnO, was used as the additive. The X‐ray photoelectron spectroscopy (XPS) analysis confirmed that ZnO segregated on SnO2 surfaces. However, after acid lixiviation the same analysis showed an undetectable surface concentration of ZnO. The evaluation of the nanostructure change and surface composition enables us to calculate the heat of segregation for the grain boundary (ΔHsegnormalgb=−47.2kJ·mol−1) and surface (ΔHsegnormals=−36.4kJ·mol−1) and the interface energy reduction because of segregation. At low‐ZnO concentrations, the additive solubilizes in the bulk and promotes particle growth. However, the segregation to the grain boundary and surface determines the relative stability of each interface, which promotes hard agglomeration and particle size stabilization at intermediated ZnO amounts. At high‐ZnO concentrations, the surface segregation stabilizes the solid‐gas interface and decreases the agglomeration and final particle size.

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Section: Chemical Composition Of Interfacesmentioning

confidence: 99%

Surface and grain‐boundary excess of ZnO‐doped SnO₂ nanopowders by the selective lixiviation method

2017

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“…The detailed description of the analysis of the experimental data, that were obtained by rotating disc electrode can be found in zembura's [12] and Guspiel's [13,14] works.…”

Section: Discussion Of the Resultsmentioning

confidence: 99%

Kinetics of Corrosion Process in H2SO4 and HNO3 Aqueous Solutions of Lead Free Sn-Ag-Cu Solder Alloys

Guśpiel

Wierzbicka-Miernik

Reczyński

2016

Archives of Metallurgy and Materials

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KInEtIcs of corrosIon procEss In H2so4 and Hno3 aquEous solutIons of lEad frEE sn-ag-cu soldEr alloysThis paper presents the results of the corrosion resistance of Sn-Ag-Cu alloys in air-saturated aqueous solutions containing NO3 -, SO4 2-ions, whose concentration was equivalent to their contents in acid rains and in concentrations 10 -100 times higher. The Ag, Cu and Sn concentrations in the corrosive media were determined using the Atomic Absorption Spectrometry. The specific dissolution rate and corrosion current were derived using the a rotating disc technique. The corrosion rate of SnAg-Cu alloys depends on pH of the examined solutions and on the concentration of oxygen near the phase boundary. In the whole range of concentrations of the applied H2SO4 + HNO3 mixtures of acids, the pure Sn was more corrosion resistant than eutectic alloy as well as the near eutectic one, following the sequence: Sn>Sn3.66Ag0.91Cu>3.8Ag0.7Cu.

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“…The validity of the model for the CO 2 data was tested by comparing experimental magnesium dissolution profiles with the linear relationship predicted by Eq. (6). Verification of the model is illustrated in Fig.…”

Section: Kinetic Model Confirmationmentioning

confidence: 99%

“…Guśpiel and Riesenkampf [6] also investigated MgO dissolution by sulfuric acid using a rotating disk technique. Dissolution of disk shaped sintered MgO pellets was measured over a temperature range of 0-70°C and acid concentrations in the range of 0.5 mM to 2.0 M. At low acid concentrations range (b 0.5 mM) MgO dissolution was controlled by proton diffusion.…”

Section: Introductionmentioning

confidence: 99%

“…Of special interest to the present study was the conclusion that MgO dissolution starts with a rapid reaction with water to form a Mg(OH) 2 layer on the crystal surface and the dissolution rate is controlled by the rate of Mg(OH) 2 dissolution. Several studies examined MgO acid dissolution by the rotating disk technique [4][5][6]. According to Fruhwirth et al [4] dissolution rate measurements of MgO crystals in a rotating disk system indicate the following controlling mechanisms; At pH b 5 the dissolution is controlled by proton surface attack:…”

Section: Introductionmentioning

confidence: 99%

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Design model for magnesium ions re-mineralization of desalinated water by dissolution of magnesia pellets

et al. 2015

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Kinetics of dissolution of ZnO, MgO and their solid solutions in aqueous sulphuric acid solutions

Cited by 22 publications

References 5 publications

Surface and grain‐boundary excess of ZnO‐doped SnO₂ nanopowders by the selective lixiviation method

Surface and grain‐boundary excess of ZnO‐doped SnO₂ nanopowders by the selective lixiviation method

Kinetics of Corrosion Process in H2SO4 and HNO3 Aqueous Solutions of Lead Free Sn-Ag-Cu Solder Alloys

Design model for magnesium ions re-mineralization of desalinated water by dissolution of magnesia pellets

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Kinetics of dissolution of ZnO, MgO and their solid solutions in aqueous sulphuric acid solutions

Cited by 22 publications

References 5 publications

Surface and grain‐boundary excess of ZnO‐doped SnO2 nanopowders by the selective lixiviation method

Surface and grain‐boundary excess of ZnO‐doped SnO2 nanopowders by the selective lixiviation method

Kinetics of Corrosion Process in H2SO4 and HNO3 Aqueous Solutions of Lead Free Sn-Ag-Cu Solder Alloys

Design model for magnesium ions re-mineralization of desalinated water by dissolution of magnesia pellets

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Surface and grain‐boundary excess of ZnO‐doped SnO₂ nanopowders by the selective lixiviation method

Surface and grain‐boundary excess of ZnO‐doped SnO₂ nanopowders by the selective lixiviation method