Search results for: MS EXAFS

• Nano-structured Pt embedded in acidic salts of heteropolymolybdate matrices: MS EXAFS study

  Publication

  • A. Witkowska
  • S. Dsoke
  • R. Marassi
  • A. DiCicco

  - NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS - Year 2015

  A structural study of Pt nano-catalysts is presented in the paper. The innovation in the case of the considered catalytic materials resides in the use a meso-microporous inorganic matrix of heteropolyacid salt of composition X2.5H0.5YMo12O40 where X = Rb, Cs and Y = P, Si as a catalyst support. Metallic nanoparticles were created by platinum ions reduction in a hot H2/Argon stream and were mainly located into matrix pores. As the...

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• Nano-structured Pt embedded in the acidic salts of heteropolymolybdate matrices: MS XAFS study

  Publication

  • A. Witkowska
  • S. Dsoke
  • R. Marassi
  • A. Di Cicco

  - Synchrotron Radiation in Natural Science - Year 2014

  Multiple-scattering extended X-ray absorption fine structure (MS EXAFS) study combined with TEM and XRD analysis of a novel Pt-based catalyst operating at low temperature fuel cells (FCs) is presented. Innovation in the case of the considered catalyst resides in the use of a porous inorganic matrix of acidic heteropolymolybdate salts as a catalyst support. Obtained results show the relation between the matrix composition and the...

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• Local ordering of nano-structured Pt probed by multiple-scattering XAFS

  Publication

  • A. Witkowska
  • A. Di Cicco
  • E. Principi

  - PHYSICAL REVIEW B - Year 2007

  W pracy przedstawiono wyniki analizy MS EXAFS krystalicznej platyny i nanostruktur platyny (klastry o rozmiarach od 1nm do 7nm). Rezultaty analizy masowej platyny (uwzględniające rozkłady dwu i trój-ciałowe) są zgodne z wcześniejszymi danymi strukturalnymi i wibracyjnymi i stały się podstawą do realistycznej analizy EXAFS nanocząstek Pt realizownej w połączeniu z wynikami pomiarów TEM, SEM i XRD. Badaniom poddano nanocząstki Pt...

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• Advances in mass spectrometry for iron speciation in plants

  Publication

  • G. AlChoubassi
  • J. Aszyk
  • P. Pisarek
  • K. Bierla
  • L. Ouerdane
  • J. Szpunar
  • R. Łobiński

  - TRAC-TRENDS IN ANALYTICAL CHEMISTRY - Year 2018

  Iron is an important nutrient essential for plants and critical for human health. The state-of-the art of methods for iron speciation in cereal grains and plant fluids is critically reviewed. Particular attention is given to the latest developments in the coupling of HPLC with the parallel ICP MS and electrospray ionization (ESI) MS/MS detection, usually QTOF MS or Q-Orbitrap MS, for the identification and quantification of iron...