Ordered Oxide Surfaces on Metals: Chromium Oxide

Pancotti, A.; Siervo, Abner de; Carazzolle, Marcelo Falsarella; Landers, Richard; Kleiman, G. G.

doi:10.1007/s11244-011-9628-7

Cited by 15 publications

(25 citation statements)

References 50 publications

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“…The 2p3/2 peak for unoxidised chromium metal would be expected to occur around 574 eV 6 . From the XPS results here, it is difficult to ascertain whether or not some level of hydroxide is also present, as the reported values for Cr(III) in Cr2O3 and Cr(OH)3 in the literature are very similar; binding energies around 576.8 eV are quoted for the 2p3/2 peak of both [48][49][50] , with 586.2 eV and 587.3 eV for the 2p1/2 of the oxide and hydroxide respectively 50 . It would seem probable that both species are present here given the values obtained.…”

Section: Xpsmentioning

confidence: 74%

Using Neutron Reflectometry to Discern the Structure of Fibrinogen Adsorption at the Stainless Steel/Aqueous Interface

et al. 2016

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Neutron reflectometry has been successfully used to study adsorption on a stainless steel surface by means of depositing a thin steel film on silicon. The film was characterized using XPS (X-ray photoelectron spectroscopy), TOF-SIMS (time-of-flight secondary ion mass spectrometry) and GIXRD (grazing incidence X-ray diffraction), demonstrating the retention both of austenitic phase and of the required composition for 316L stainless steel. The adsorption of fibrinogen from a physiologically-relevant solution onto the steel surface was studied using neutron reflectometry and QCM (quartz crystal microbalance) and compared to that on a deposited chromium oxide surface. It was found that the protein forms an irreversibly-bound layer at low concentrations, with maximum protein concentration a distance of around 20 Å from the surface. Evidence for a further diffuse reversibly-bound layer forming at higher concentrations was also observed. Both the structure of the layer revealed by the neutron reflectometry data and the high water retention predicted by the QCM data suggest that there is a significant extent of protein unfolding upon adsorption. A lower extent of adsorption was seen on the chromium surfaces, although the adsorbed layer structures were similar, suggesting comparable adsorption mechanisms.

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Section: Xpsmentioning

confidence: 74%

Using Neutron Reflectometry to Discern the Structure of Fibrinogen Adsorption at the Stainless Steel/Aqueous Interface

et al. 2016

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“…31,37 Among the transition metal ultrathin oxide films, Cr oxide is one of the less investigated (see, for instance, Refs. [38][39][40][41][42]. Chromium oxide forms stable phases in the bulk with different structures, stoichiometry, and properties.…”

Section: Introductionmentioning

confidence: 99%

Self-organized chromium oxide monolayers on Fe(001)

et al. 2013

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The oxygen-saturated Fe(001)-p(1 × 1)O surface has been used as a template to stabilize two-dimensional Cr oxides on Fe(001). Cr deposition at 400 • C leads to two different well-ordered phases, depending on the amount of Cr deposited. In the submonolayer regime a novel c(4 × 2) overlayer self-assembles on the Fe(001)-p(1 × 1)O surface, saturating for a coverage of about 0.75 monolayers. This phase becomes unstable for higher coverages, when a ( √ 5 × √ 5)R27 • superstructure emerges. The structural and electronic details of the two one-layer-thick oxides are studied by combining high-resolution scanning tunneling microscopy, low-energy electron diffraction, Auger electron spectroscopy, and density functional theory.

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“…Cr atoms in the Cr 2 O 3 layer are tetrahedrally coordinated by the oxygen atoms, packed in a hexagonal close packing (hcp) unit cell, whose axial ratio a:c is known to be 1:2.74 (4.96 Å :13.6 Å ) [16]. On the other hand, the structure of CuCrO 2 , delafossite, consists of a layer of linearly arranged copper atoms and octahedrally coordinated chromium atoms [17].…”

Section: Wettability Of Stainless Steel Having An Oxide Layer On the mentioning

confidence: 99%

Effect of oxygen on the wettability of 304L stainless steel by liquid Ag–Cu eutectic alloy

Kang

Han²,

Kim³

2015

J Mater Sci

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In order to suggest brazing conditions of 304L stainless steel with Ag-Cu eutectic alloy containing oxygen, a wetting test and sandwich brazing test were performed. During the wetting tests, the contact angle slightly decreased with increasing temperature. In addition, as the oxygen content in the Ag-Cu alloy was controlled between 0.0212 and 0.0415 wt%, the contact angle became as low as about 70°-75°at 1093 K. From the sandwich brazing tests, with the oxygen-free Ag-Cu alloy, a number of macroscopic scale defects were observed, whereas the Ag-Cu alloy containing 0.0415 wt% oxygen showed a sound interface with the base metal. This may be caused by the removal or modification of the Cr 2 O 3 oxide layer on the stainless steel surface by soluble oxygen and copper. The current experiments suggest that stainless steel brazing is possible with the Ag-Cu eutectic alloy by controlling the oxygen content without high vacuum application.

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Ordered Oxide Surfaces on Metals: Chromium Oxide

Abstract: We present X-ray photoelectron spectroscopy (XPS) and X-ray photoelectron diffraction (XPD) investigations of ordered chromium oxide ultrathin films prepared on a Pd(111) single-crystal surface.

Cited by 15 publications

References 50 publications

Using Neutron Reflectometry to Discern the Structure of Fibrinogen Adsorption at the Stainless Steel/Aqueous Interface

Using Neutron Reflectometry to Discern the Structure of Fibrinogen Adsorption at the Stainless Steel/Aqueous Interface

Self-organized chromium oxide monolayers on Fe(001)

Effect of oxygen on the wettability of 304L stainless steel by liquid Ag–Cu eutectic alloy

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