Surface and Tribological Chemistry of Water and Carbon Dioxide on Copper Surfaces

Furlong, Octavio Javier; Li, Zhenjun; Gao, Feng

doi:10.1007/s11249-008-9349-7

Cited by 11 publications

(6 citation statements)

References 36 publications

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“…Additional adsorbing species can greatly complicate the surface reactions. Coadsorption of water and carbon dioxide onto Cu formed hydroxyl, formate, and methoxy species with H 2 O providing the hydrogen [45,46]. In addition to reactions with other species, dissociation of water is important as molecular hydrogen has been shown to make steel more brittle and prone to fracture [47].…”

Section: Environmental Effect On Friction and Wear Of Metalsmentioning

confidence: 99%

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

et al. 2015

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Tribology involves not only two-body contacts of two solid materials-a substrate and a counter-surface; it often involves three-body contacts whether the third body is intentionally introduced or inevitably added during the sliding or rubbing. The intentionally added third body could be lubricant oil or engineered nanomaterial used to mitigate the friction and wear of the sliding contact. The inevitably added third body could be wear debris created from the substrate or the counter surface during sliding. Even in the absence of any solid third-body between the sliding surfaces, molecular adsorption of water or organic vapors from the surrounding environment can dramatically alter the friction and wear behavior of solid surfaces tested in the absence of lubricant oils. This review article covers the last case: the effects of molecular adsorption on sliding solid surfaces both inevitably occurring due to the ambient test and intentionally introduced as a solution for engineering problems. We will review how adsorbed molecules can change the course of wear and friction, as well as the mechanical and chemical behavior, of a wide range of materials under sliding conditions.

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Section: Environmental Effect On Friction and Wear Of Metalsmentioning

confidence: 99%

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

et al. 2015

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“…The literature includes experimental and theoretical studies in diverse research areas such as heterogeneous catalysis (Refs. [1,2] are examples of recent publications), meteorology [3,4], geology [5,6], physical chemistry [7,8], solar energy conversion [9][10][11], pharmacy [12], atmospheric chemistry [13], electrochemistry [14,15], tribology [16,17], and corrosion science [18,19]. Advancements in experimental and computational techniques have resulted in considerable progress in our fundamental view of water-solid interactions, and the research field has been summarized in a few most comprehensive reviews [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Volta Potential Evolution of Intermetallics in Aluminum Alloy Microstructure Under Thin Aqueous Adlayers: A combined DFT and Experimental Study

et al. 2018

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In this work, first-principle density functional theory (DFT) was used to calculate the work function and Volta potential differences between aluminum alloy matrix and two intermetallic phases (Mg 2 Si and Al 2 Cu) with varying surface terminations as a function of adhering monolayers (ML) of water. The calculated data were compared with experimental local Volta potential data obtained by the scanning Kelvin probe force microscopy (SKPFM) on a commercial aluminum alloy AA6063-T5 in atmospheric environments with varying relative humidity (RH). The calculations suggest that the surface termination has a major effect on the magnitude and polarity of the Volta potential of both intermetallic phases (IMP's). The Volta potential difference between the IMP's and the aluminum matrix decreases when the surface is gradually covered by water molecules, and may further change as a function of adhering ML's of water. This can lead to nobility inversions of the IMP's relative to the aluminum matrix. The measured Volta potential difference between both IMP's and their neighboring matrix is dependent on RH. Natural oxidation in ambient indoor air for 2 months led to a nobility inversion of the IMP's with respect to the aluminum matrix, with the intermetallics showing anodic nature already in dry condition. The anodic nature of Al 2 Cu remained with the introduction of RH, whereas Mg 2 Si became cathodic at high RH, presumably due to de-alloying of Mg and oxide dissolution. The DFT calculations predicted an anodic character of both IMP's in reference to the oxidized aluminum matrix, being in good agreement with the SKPFM data. The DFT and SKPFM data were discussed in light of understanding localized corrosion of aluminum alloys under conditions akin to atmospheric exposure.

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“…In particular, the lubrication of sliding copper−copper interfaces in electrical motors − provides a particular challenge. Gas-phase lubricants based on water vapor have been used to reduce friction and wear, − but they tend to lead to asymmetric wear rates and failure at higher temperatures. , The following explores the chemistry of dimethyl disulfide (DMDS) on copper surfaces to establish whether it is sufficiently reactive to potentially form a tribofilm near room temperature as required for lubrication of the sliding copper−copper contact in an electric motor. These experiments will provide the background information for ultimately examining the frictional properties of dialkyl disulfides in ultrahigh vacuum (UHV) − and are thus carried out on both a Cu(111) single crystal substrate and copper foils, since the latter type of sample will eventually be examined in the UHV tribometer rather than single crystal samples.…”

Section: Introductionmentioning

confidence: 99%

The Surface Chemistry of Dimethyl Disulfide on Copper

Furlong

Miller

et al. 2010

Langmuir

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The surface chemistry of dimethyl disulfide (DMDS) is studied on a Cu(111) single crystal and a polished copper foil in ultrahigh vacuum as a basis for understanding its tribological chemistry using a combination of temperature-programmed desorption (TPD), reflection-absorption infrared spectroscopy (RAIRS), and X-ray photoelectron spectroscopy (XPS). Low-energy electron diffraction reveals that the polished foil becomes ordered on heating in vacuo and displays identical surface chemistry to that found on the Cu(111) surface. Dimethyl disulfide reacts with the copper surface at 80 K to form thiolate species. Heating the surface to ∼230 K causes a small portion of the thiolate species to decompose to form methyl groups adsorbed on the surface. Further heating results in methane and C(2) hydrocarbon desorption at ∼426 K, due to a reaction of adsorbed methyl species, to completely remove carbon from the surface and to deposit atomic sulfur.

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Surface and Tribological Chemistry of Water and Carbon Dioxide on Copper Surfaces

Cited by 11 publications

References 36 publications

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

Vapors in the ambient—A complication in tribological studies or an engineering solution of tribological problems?

Volta Potential Evolution of Intermetallics in Aluminum Alloy Microstructure Under Thin Aqueous Adlayers: A combined DFT and Experimental Study

The Surface Chemistry of Dimethyl Disulfide on Copper

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