Magnesium salts and oxide: an XPS overview

Ardizzone, S.; Bianchi, Claudia L.; Fadoni, M.; Vercelli, Barbara

doi:10.1016/s0169-4332(97)00180-3

Cited by 284 publications

(149 citation statements)

References 26 publications

Supporting

Mentioning

122

Contrasting

Order By: Relevance

“…The peak at 531 eV is attributed to bulk oxygen of Mg(OH) 2 , while that centered at 533 eV is associated with the chemisorbed oxygen species on surface. [24] O 1s spectrum for PM36h is similar to that of PM18h. Comparatively, PM0h shows an additional peak associated with the oxygen species in CO 3 2 at 534.4 eV, which can be resolved into three peaks.…”

Section: Thermodynamic Stablity Of Hexagonal Mg(oh) 2 Nanoflakesmentioning

confidence: 59%

Kinetic Control of Hexagonal Mg(OH)₂ Nanoflakes for Catalytic Application of Preferential CO Oxidation

Chen

et al. 2017

Chin. J. Chem.

View full text Add to dashboard Cite

Controlling the growth of nanocrystals is one of the most challenged issues in current catalytic field, which helps to further understand the size and morphology related behaviors for catalytic applications. In this work, we investigated the plane growth kinetics of Mg(OH) 2 for catalytic application in preferential CO oxidation. Nanoflakes were synthesized through hydrothermal method. The morphology and structure of nanoflakes were characterized by TEM, SEM, and XRD. By varying the reaction temperature and time, Mg(OH) 2 nanoflakes underwent an anisotropic growth. Benefited from the Ostwald ripening process, the thickness of nanoflake corresponding to the (110) plane of Mg(OH) 2 was tuned from 7.6 nm to 24.0 nm, while the diameter of (001) plane increased from 18.2 nm to 30.2 nm. The grain growth kinetics for the thickness was well described in terms of an equation, D 5 ＝7.6 5 ＋6.9×10 8 exp(28.14/RT). After depositing Pt nanoparticles onto these Mg(OH) 2 nanoflakes, an excellent catalytic performance was achieved for preferential CO oxidation in H 2 -rich streams with a wide temperature window from 140 ℃ to 240 ℃ for complete CO conversion due to the interaction between Pt and hydroxyl groups. The findings reported here would be helpful in discovering novel catalysts for application of proton exchange membrane fuel cells.

show abstract

Section: Thermodynamic Stablity Of Hexagonal Mg(oh) 2 Nanoflakesmentioning

confidence: 59%

Kinetic Control of Hexagonal Mg(OH)₂ Nanoflakes for Catalytic Application of Preferential CO Oxidation

Chen

et al. 2017

Chin. J. Chem.

View full text Add to dashboard Cite

show abstract

“…5a shows Mg 2p and Ag 3d XPS spectra of corrosion layer of T4 treated Mg2Ag. For magnesium corrosion products of all materials, the Mg 2p peak spreads from 47.0 eV to 52.8 eV, which can be fitted by Mg(OH) 2 at 49.3 eV and MgO at 50.3 eV (Ardizzone et al, 1997). Besides, Mg-CO 3 and Mg-PO 4 bindings were also present.…”

Section: Corrosion Products Analysismentioning

confidence: 87%

Antibacterial biodegradable Mg-Ag alloys

Tie¹,

Feyerabend²,

Muller³

et al. 2013

eCM

197

124

View full text Add to dashboard Cite

The use of magnesium alloys as degradable metals for biomedical applications is a topic of ongoing research and the demand for multifunctional materials is increasing. Hence, binary Mg-Ag alloys were designed as implant materials to combine the favourable properties of magnesium with the well-known antibacterial property of silver. In this study, three Mg-Ag alloys, Mg2Ag, Mg4Ag and Mg6Ag that contain 1.87 %, 3.82 % and 6.00 % silver by weight, respectively, were cast and processed with solution (T4) and aging (T6) heat treatment.The metallurgical analysis and phase identification showed that all alloys contained Mg4Ag as the dominant β phase. After heat treatment, the mechanical properties of all Mg-Ag alloys were significantly improved and the corrosion rate was also significantly reduced, due to presence of silver. Mg(OH) 2 and MgO present the main magnesium corrosion products, while AgCl was found as the corresponding primary silver corrosion product. Immersion tests, under cell culture conditions, demonstrated that the silver content did not significantly shift the pH and magnesium ion release. In vitro tests, with both primary osteoblasts and cell lines (MG63, RAW 264.7), revealed that Mg-Ag alloys show negligible cytotoxicity and sound cytocompatibility. Antibacterial assays, performed in a dynamic bioreactor system, proved that the alloys reduce the viability of two common pathogenic bacteria, Staphylococcus aureus (DSMZ 20231) and Staphylococcus epidermidis (DSMZ 3269), and the results showed that the killing rate of the alloys against tested bacteria exceeded 90%. In summary, biodegradable Mg-Ag alloys are cytocompatible materials with adjustable mechanical and corrosion properties and show promising antibacterial activity, which indicates their potential as antibacterial biodegradable implant materials.

show abstract

“…After CO 2 exposure a well developed peak appears at a binding energy 290 eV for the Ar + -irradiated sample while the non-irradiated one displays a very weak peak at the same binding energy: C 1s/Si 2p ratio is 3 to 5 times higher for the irradiated sample. This peak is characteristic of carbonates (Ardizzone et al 1997). This experiment thus suggests an elevated chemical reactivity for the irradiated sample.…”

Section: Chemical Reactivity After Irradiationmentioning

confidence: 93%

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Gengembre

Frere²,

Grimblot

et al. 2008

A&A

View full text Add to dashboard Cite

Aims. Olivine surfaces have been subjected to low-energy ion irradiation with H + , He + and Ar + at energies within the keV range in order to simulate the effects of energetic gas-grain interactions within shocked regions of the interstellar medium. Methods. The induced modifications in the chemical composition and the bonding configuration of the upper and the near surface regions were monitored in situ by X-ray photoelectron spectroscopy (XPS). The associated morphological evolution of the samples was studied by atomic force microscopy (AFM). Results. Results show that the surface chemistry evolves during irradiation with a noticeable Mg enrichment relative to Si. This evolution is interpreted as coming from magnesium atom diffusion driven by the electric field caused by the positive ion implantation. The iron valence state is also strongly affected by irradiation, with reduction occurring at relatively high fluxes. However, at low fluxes the iron is found to oxidise from Fe 2+ to Fe 3+ due to a charge transfer between the incident positive ions and the iron in the sample. The atomic force microscopy results show that the surface roughness tends to increase with irradiation and that this roughness influences the surface chemical reactivity of the grains, as shown by the enhanced formation of carbonate on the surfaces when they are exposed to a CO 2 atmosphere. The implications for the evolution of interstellar dust include an enhanced dust catalytic activity. These effects would arise from modification under irradiation of the surface reactivity and an increase in the available grain surface area.

show abstract

Magnesium salts and oxide: an XPS overview

Cited by 284 publications

References 26 publications

Kinetic Control of Hexagonal Mg(OH)₂ Nanoflakes for Catalytic Application of Preferential CO Oxidation

Kinetic Control of Hexagonal Mg(OH)₂ Nanoflakes for Catalytic Application of Preferential CO Oxidation

Antibacterial biodegradable Mg-Ag alloys

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Contact Info

Product

Resources

About

Magnesium salts and oxide: an XPS overview

Cited by 284 publications

References 26 publications

Kinetic Control of Hexagonal Mg(OH)2 Nanoflakes for Catalytic Application of Preferential CO Oxidation

Kinetic Control of Hexagonal Mg(OH)2 Nanoflakes for Catalytic Application of Preferential CO Oxidation

Antibacterial biodegradable Mg-Ag alloys

Chemical and morphological evolution of a silicate surface under low-energy ion irradiation

Contact Info

Product

Resources

About

Kinetic Control of Hexagonal Mg(OH)₂ Nanoflakes for Catalytic Application of Preferential CO Oxidation

Kinetic Control of Hexagonal Mg(OH)₂ Nanoflakes for Catalytic Application of Preferential CO Oxidation