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Tuesday, August 4, 2020 | History

2 edition of surface interaction of nitrogen and rhenium. found in the catalog.

surface interaction of nitrogen and rhenium.

David William Kammer

surface interaction of nitrogen and rhenium.

by David William Kammer

  • 182 Want to read
  • 35 Currently reading

Published .
Written in English

    Subjects:
  • Gases -- Absorption and adsorption.,
  • Nitrogen -- Fixation.,
  • Rhenium.

  • The Physical Object
    Paginationvii, 66 l.
    Number of Pages66
    ID Numbers
    Open LibraryOL16754519M

    Focusing on two atomically rough rhenium surfaces: Re() and Re(11 21), we reveal the dependence of their surface morphology on adsorbate coverage and . surface together with the dehydrated surface species. Crystalline Rq07 is not formed at high loadings and two slightly different surface rhenium oxide species are observed as a function of surface coverage. Both possess three terminal Re=O bonds and one bridging R+AI bond.

      The rhenium deposition solutions contained M ammonia perrhenate (NH 4 ReO 4), M sulfuric acid (H 2 SO 4), and various amounts of lithium chloride (LiCl). Rhenium free electrolytes comprising only LiCl and H 2 SO 4 were used to characterize the effects of LiCl on proton reduction. All chemicals were at least ACS grade and deionized. The microalgae’s surface was chemically functionalized with hybrid vitamin Bphotoactivatable molecules and the materials further loaded with highly active rhenium(I) tricarbonyl anticancer complexes. The constructs showed enhanced adherence to colorectal cancer (CRC) cells and slow release of the chemotherapeutic drugs.

    The oxidation of pure rhenium was examined from to °C in oxygen/argon mixtures. Linear weight-loss kinetics were observed. Gas pressures, flow rates, and temperatures were methodically varied to determine the rate-controlling steps. The reaction at and °C appeared to be controlled by a chemical-reaction step at the surface; whereas the higher-temperature reactions appeared to.   A deactivating behavior of TiO2 photocatalysts in NO2 oxidation to HNO3 was studied with use of TiO2 nanoparticulate thin films (− μm thick) under UV light illumination over 10 h. The photocatalytic activity was decreased with accumulation of HNO3 on the TiO2 surface. For thicker TiO2 films, the deactivation rate was found to be slower.


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Surface interaction of nitrogen and rhenium by David William Kammer Download PDF EPUB FB2

Adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86AAuthor: David William Kammer.

The interaction of nitrogen with rhenium received 7 February ; accepted 15 March R P H Gasser and R Thwaites, Physical Chemistry Laboratory, South Parks Road, Oxford The initial sticking probability of nitrogen on a clean rhenium filament was at and the uptake at saturation was about 10'4 molecules per sq by: The steady state surface concentration of nitrogen on rhenium is about ^ that on tungsten and does not vary much with rhenium temperature between and Flashing the covered rhenium wire, with the temperature rising at a controlled rate, indicated three binding states, two of which desorb be- tween and ; the other desorbing well above Cited by: Nitrogen.

The interaction of nitrogen with metal surfaces shows many of the same characteristics as those described above for oxygen. However, in general N 2 is less susceptible to dissociation as a result surface interaction of nitrogen and rhenium.

book the lower M-N bond strength and the substantial kinetic. Summary The interaction of room temperature nitrogen gas molecules with rhenium polycrystalline foil, Re(ll20) and Re() surfaces was studied in the temper- ature range of K.

Nitrogen molecules adsorb molecularly on the three surfaces at 80 K with binding energy which slightly increases from the Re() surface (24 kJ/mol) to Re(ll20) (29 kJ/mol on the a2 site) and to the Cited by: J. Chem. Soc. All Publications/Website. OR SEARCH CITATIONS. Re on the Re surface. In this study, we examine the interaction of rhenium with oxygen at temperatures from °C in O2/Ar mixtures.

Flow rates, gas pressures, and temperatures were methodically varied in order to determine the rate controlling steps. In addition, the microstructures after reaction were examined.

Reactions of N 2 + ion beams with the surface of polycrystalline rhenium foil over the range –3 eV have been studied by the techniques of x‐ray photoelectron spectroscopy (XPS) and thermal desorption spectrometry (TDS).

The reactions produce a nitride layer of the type ReN x, ⩽x⩽, with x varying as a function of ion kinetic energy and depth into the surface. Rhenium is the element No. 75 of the periodic table (period—6, group—7 (or VIIB), relates to transition metals) with the ground state level 6S5/2 and electron configuration 1s 2 2s 2 2p 6 3s 2.

It is noteworthy that, upon rhenium impregnation, the binding energy of pyridinic nitrogen shifts to the higher energy position from eV to eV (Fig.

3c), implying the coordination between rhenium and nitrogen in bipyridine. The increase of binding energy is ascribed to the decrease of electron cloud density of pyridine nitrogen, resulting from the transfer of electrons.

The degradation of a benzoylazo-complex of rhenium() in the presence of various tertiary phosphines leads to a series of nitrogen complexes of rhenium() having low (N [[triple bond, length as m-dash]] N). The interaction of aluminum with the ($$10\bar 10$$) rhenium surface was studied experimentally within a broad temperature range, – K.

Surface aluminide (SA) ReAl with a concentration. The interaction of copper with a rhenium() surface: structure, energetics, and growth modes.

Surface Science(), DOI: /S(99) D Schlatterbeck, M Parschau, K Christmann. Silver films grown on a rhenium() surface: a. The review presents synthetic approaches to modern rhenium-based catalysts. Creation of an active center is considered as a process of obtaining a nanoparticle or a molecule, immobilized within a matrix of the substrate.

Selective chemical routes to preparation of particles of rhenium alloys, rhenium oxides and the molecules of alkyltrioxorhenium, and their insertion into porous structure of.

Purchase Fluorine Chemistry V5 - 1st Edition. Print Book & E-Book. ISBN Rhenium nitride (ReNx) films were grown on ()-Si substrates by the reactive pulsed laser deposition (PLD) method using a high purity Re rod in an environment of molecular nitrogen. Restarted ammonia synthesis pro- ceeded on such a nitrogen-containing sur- face at an identical rate to that observed on the initially clean rhenium, and, as with iron, is probably due to resegregation of atomic nitrogen on the metal surface which had dissolved in the bulk metal during the synthesis reaction (5).

Surface Pen sold separately for Surface Go 2, Surface Go, Surface Pro X, Surface Laptop 3, Surface Pro 7, Surface Book 3 and Surface Book 2. 1 System software uses significant storage space.

Available storage is subject to change based on system software updates and apps usage. 1 GB = 1 Gigabyte. 1 TB = 1, g: nitrogen  rhenium. We have studied the interaction of carbon monoxide with a Re() surface between and K by means of low-energy electron diffraction (LEED), temperature-programmed thermal desorption, and work function change (Δφ) measurements.

We find two (temperature-dependent) interaction/reaction channels: At K, CO forms molecular (α) states with binding energies between 95 and kJ/mol. @article{osti_, title = {SURFACE TENSION OF REFRACTORY METALS}, author = {Radcliffe, S V and Udin, H}, abstractNote = {>An electron-bombardment heating technique was applied to the measurement of the surface tension of solid niobium by a modification of the Udin method.

The value obtdined is dynes cm/sup -1/ at deg C in a vacuum of approx 10/sup -5/ mm. The interaction of rhenium oxide with the support has been studied by a number of characterisation techniques, resulting in a detailed picture of the structure of the supported rhenium oxide.Nitrogen adsorption/desorption isotherms and BET specific surface area were measured at liquid nitrogen temperature with a Micromeritics TriStar surface area and porosity analyser.

The presence of unreduced small cobalt/rhenium-containing oxidic clusters and/or a strong cobalt/rhenium interaction with the silica aerogel support can be.To obtain the specific surface area, a, from n m, Brunauer, Emmett and Teller followed Emmett and Brunauer [9] in assuming the completed monolayer to be in a close-packed state.

In spite of the perceived theoretical limitations of the BET model, the BET-nitrogen method soon became established as a standard procedure for surface area determination.