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Sökning: WFRF:(Norrby T)

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  • Norrby, T., et al. (författare)
  • EALs for hydropower applications : Part 2 turbine oil development and field testing
  • 2006
  • Ingår i: Automotive and industrial lubrication. ; , s. 144-
  • Konferensbidrag (refereegranskat)abstract
    • Research regarding environmentally adapted lubricants results of the research performed at LuleÃ¥ University of Technology were positive. Thus, the formulation work of an environmentally adapted lubricant for hydropower applications started. A change to a synthetic ester based lubricant would give technical advantages as well as environmental benefits. The initial tests were conducted on the base fluid. Two turbine oils were developed, Turb Way SE and TurbWay SE LV, for hydropower applications. Oxidation tests were performed in both the RPVOT (ASTM D 2272) and in TOST (ASTM D 943). The stability of the turbine oil was > 20 times better than tested environmentally adapted hydraulic fluids. Field tests were conducted in a full scale turbine at Porjus hydropower plant to confirm the promising results obtained from the research in the tilting thrust bearing rig. 
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  • Racys, D. T., et al. (författare)
  • Pd-eta(3)-C6H9 complexes of the Trost modular ligand: high nuclearity columnar aggregation controlled by concentration, solvent and counterion
  • 2015
  • Ingår i: Chemical Science. - : Royal Society of Chemistry (RSC). - 2041-6520 .- 2041-6539. ; 6:10, s. 5793-5801
  • Tidskriftsartikel (refereegranskat)abstract
    • Under optimised conditions, the Trost modular ligand (TML) series induces high levels of asymmetric induction in an extraordinarily wide range of reactions involving palladium pi-allyl intermediates. Prior mechanistic investigations into reactions involving Pd-eta(3)-C6H9 intermediates have focussed on the monomeric 13-membered ring formed via P, P-chelation of the ligand to Pd. However, it is also recognised that ring-opening oligomerisation provides a pool of high nuclearity Pd-eta(3)-C6H9 species that, by affording a low level, or even the opposite sense, of asymmetric induction relative to the mononuclear species, are responsible for a reduction in selectivity under non-optimised conditions. Herein we describe an investigation by NMR spectroscopy, molecular mechanics, molecular dynamics, and small-angle neutron scattering (SANS), of a Pd-eta(3)-C6H9 cation bearing the 1,2-diaminocyclohexane TML ligand (2). Using both nondeuterated and perdeuterated (D-47) isotopologues of the resulting complexes ([1](+)), we show that a two-stage oligomerisation-aggregation process forms self assembled cylindrical aggregates of very high nuclearity (up to 56 Pd centres). We also investigate how concentration, solvent and counter-anion all modulate the extent of oligomerisation.
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