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Träfflista för sökning "WFRF:(Besenbacher Flemming) srt2:(2008)"

Sökning: WFRF:(Besenbacher Flemming) > (2008)

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1.
  • Mosegaard, Lene, et al. (författare)
  • Reactivity of LiBH4: In situ synchrotron radiation powder X-ray diffraction study
  • 2008
  • Ingår i: Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 112:4, s. 1299-1303
  • Tidskriftsartikel (refereegranskat)abstract
    • Lithium tetrahydridoboranate (LiBH4) may be a potentially interesting material for hydrogen storage, but in order to absorb and desorb hydrogen routinely and reversibly, the kinetics and thermodynamics need to be improved significantly. A priori, this material has one of the highest theoretical gravimetric hydrogen contents, 18.5 wt%, but unfortunately for practical applications, hydrogen release occurs at too high temperature in a non-reversible way. By means of in situ synchrotron radiation powder X-ray diffraction (SR-PXD), the interaction between LiBH4 and different additives-SiO2, TiCl3, LiCl, and Au - is investigated. It is found that silicon dioxide reacts with molten LiBH4 and forms Li2SiO3 or Li4SiO4 at relatively low amounts of SiO2, e.g., with 5.0 and 9.9 mol % SiO2 in LiBH4, Whereas, for higher amounts of SiO2 (e.g., 25.5 mol %), only the Li2SiO3 phase is observed. Furthermore, we demonstrate that a solid-state reaction occurs between LiBH4 and TiCl3 to form LiCl at room temperature. At elevated temperatures, more LiCl is formed simultaneously with a decrease in the diffracted intensity from TiCl3. Lithium chloride shows some solubility in solid LiBH4 at T > 100 degrees C. This is the first report of substituents that accommodate the structure of LiBH4 by a solid/solid dissolution reaction. Gold is found to react with molten LiBH4 forming a Li-Au alloy with CuAu3-type structure. These studies demonstrate that molten LiBH4 has a high reactivity, and finding a catalyst for this H-rich system may be a challenge.
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2.
  • Schnadt, Joachim, et al. (författare)
  • Extended One-Dimensional Supramolecular Assembly on a Stepped Surface
  • 2008
  • Ingår i: Physical Review Letters. - 1079-7114. ; 100
  • Tidskriftsartikel (refereegranskat)abstract
    • 2,6-naphthalene-dicarboxylic acid was adsorbed on a Ag(110) surface with an average terrace width of only some tens of a nm. Scanning tunneling microscopy shows that the adsorbates self-assemble into one-dimensional mesoscale length chains. These extend over several hundred nanometers and thus the structure exhibits an unprecedented tolerance to monatomic surface steps. Density functional theory and x-ray photoelectron spectroscopy explain the behavior by a strong intermolecular hydrogen bond plus a distinct template-mediated directionality and a high degree of molecular backbone flexibility. ©2008 The American Physical Society
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3.
  • Weigelt, Sigrid, et al. (författare)
  • Formation of trioctylamine from octylamine on Au(111)
  • 2008
  • Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 1520-5126 .- 0002-7863. ; 130:16, s. 5388-5388
  • Tidskriftsartikel (refereegranskat)abstract
    • The adsorption of octylamine on Au(111) under ultrahigh vacuum conditions is investigated. The molecules surprisingly undergo a thermally activated chemical reaction, resulting in formation of trioctylamine as confirmed both by X-ray photoelectron spectroscopy (XPS) and by comparison to the scanning tunneling microscopy (STM) signature of trioctylamine deposited directly onto the surface.
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  • Resultat 1-3 av 3

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