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Underpotential deposition of lithium on aluminum in ultrahigh-vacuum environments

Article Abstract:

Research was conducted to examine the electrochemical characteristics of clean aluminum in LiClO4(PEO) solutions in ultrahigh vacuum using as electrodes both foils and thin films vapor deposited on boron-doped diamond layers supported on Si substrates. The study was motivated by a theory predicting that Li and Na underpotential deposition (UPD) shifts on low-inded Al single-crystal surfaces. Results revealed a clearly defined peak in the scan in the positive direction centered at ca. 0.90 V which is attribute to the stripping of UPD Li on Al.

Aluminum, Aluminum (Metal), Adsorption, Lithium, Lithium (Metal), Electrophoretic deposition, High temperature materials, Materials at high temperatures

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Structure, energetics, and dynamics of water adsorbed on the muscovite (001) surface: A molecular dynamics simulation

Article Abstract:

Molecular dynamics simulations at constant temperature and volume were performed for a series of model systems consisting of a two-layer muscovite slab, and 0 to 319 adsorbed H2O molecules, probing the atomistic structure and dynamics of surface aqueous films up to 3 nm in thickness. The simulations predict that a full molecular monolayer surface water coverage represents a relatively stable surface structure in terms of the lowest diffusional mobility of H2O molecules along the surface.

Structure, Muscovite

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Surface dynamics of coadsorbed CO and D(sub 2)O on Pt(100) in ultrahigh vacuum as studied by time-resolved infrared reflection absorption spectroscopy

Article Abstract:

The vibrational features of CO adsorbed on Pt(100) surfaces at saturation coverages exposed subsequently to various amounts of water at 105 K in ultrahigh vacuum were monitored by time-resolved infrared reflection absorption spectroscopy. The findings indicated that under the conditions of the experiments, the interfacial dynamics are relatively slow, involving a gradual rearrangement of adsorbed Co and D(sub 2)O on the surface to yield surface solvated CO.

Optical properties, Platinum compounds

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