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1.
XAS study of thermal and hydrothermal stability of two iron containing molecular sieves
Mojca Rangus, Iztok Arčon, Alojz Kodre, Tadeja Birsa Čelič, Jana Padežnik Gomilšek, Nataša Zabukovec Logar, 2010, final research report

Found in: ključnih besedah
Summary of found: ...rentgenska absorpcija, spektroskopija, Fe EXAFS, ...
Keywords: rentgenska absorpcija, spektroskopija, Fe EXAFS
Published: 15.10.2013; Views: 2710; Downloads: 10
URL Fulltext (0,00 KB)

2.
Absolute determination of the X-ray absorption coefficient of barium in the L region using a liquid absorption cell
Alojz Kodre, Jana Padežnik Gomilšek, Robert Hauko, Martin Šala, Iztok Arčon, 2013, original scientific article

Found in: ključnih besedah
Summary of found: ...barij, atomski absorpcijski presek, absorpcijski robovi L, EXAFS, ...
Keywords: barij, atomski absorpcijski presek, absorpcijski robovi L, EXAFS
Published: 15.10.2013; Views: 3597; Downloads: 69
URL Fulltext (0,00 KB)

3.
Structural and magnetic properties of Fe-doped BaTiO [sub] 3 ceramics
I. Mikulska, 2014, doctoral dissertation

Found in: ključnih besedah
Summary of found: ...barijev titanat, kisikova vrzel, Fe rob K EXAFS, XANES, disertacije, ...
Keywords: barijev titanat, kisikova vrzel, Fe rob K EXAFS, XANES, disertacije
Published: 22.01.2015; Views: 2615; Downloads: 203
URL Fulltext (0,00 KB)
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4.
X-ray absorption spectroscopy and related techniques
Iztok Arčon, Alojz Kodre, Jana Padežnik Gomilšek, 2004, original scientific article

Abstract: In the extensive field of X-ray diagnostic techniques, nowadays mostly implemented on synchrotron X-ray sources, the X-ray absorption methods offer a relatively simple tool for structural analysis of materials. The advantage of the methods is the sensitivity to chemical species and the insensitivity to the long-range order. An overview of various detection techniques is given together with the discussion of accuracy of the method with regard to the spatial resolution and the possible contamination by intra-atomic contributions, the multielectron photoexcitations.
Found in: ključnih besedah
Summary of found: ...X-žarki, absorpcija, EXAFS, XANES, ...
Keywords: X-žarki, absorpcija, EXAFS, XANES
Published: 10.07.2015; Views: 1994; Downloads: 11
URL Fulltext (0,00 KB)

5.
High-resolution X-ray absorption spectrometry of atomic vapors
Iztok Arčon, Jana Padežnik Gomilšek, Alojz Kodre, Andrej Mihelič, 2004, original scientific article

Abstract: A measurement of an x-ray absorption spectrum of a monatomic sample yields pure atomic absorption essential for the EXAFS (Extended X-ray Absorption FineStructure) analysis in cases of a weak structural signal. A construction of an absorption cell to contain vapor sample takes into account specific properties of the investigated element. Metal-vapor absorption cells for the elements K, zn, Rb, Cd, Cs, and Hg are presented and comments are made on the use of materials and the operating mechanisms of the cells.
Found in: ključnih besedah
Summary of found: ...yields pure atomic absorption essential for the EXAFS (Extended X-ray Absorption FineStructure) analysis in cases...
Keywords: X-žarki, absorpcija, EXAFS, absorpcijske celice
Published: 10.07.2015; Views: 2149; Downloads: 8
URL Fulltext (0,00 KB)

6.
Operando (micro) XAFS analysis
Katarina Vogel-Mikuš, Robert Dominko, Iztok Arčon, 2016, published scientific conference contribution abstract (invited lecture)

Abstract: In the talk the principles of XAS methods were presented with practical examples which illustrate the possibilities and advanced approaches for their use in structural analysis of different types of materials. The emphasis will be on to the use of XAS spectroscopy in operando mode and in combination with X-ray microscopy.
Found in: ključnih besedah
Summary of found: ...X-ray absorption spectroscopy, X-ray microscopy, EXAFS, XANES, opearndo mode...
Keywords: X-ray absorption spectroscopy, X-ray microscopy, EXAFS, XANES, opearndo mode
Published: 25.03.2016; Views: 2395; Downloads: 38
.pdf Fulltext (18,40 MB)

7.
Removal of manganese in batch and fluidized bed systems using beads of zeolite a as adsorbent
Bojana Obradovic, Nataša Novak Tušar, Iztok Arčon, Janez Kovač, Mina Jovanovic, Nevenka Rajić, 2016, original scientific article

Abstract: In this study the uptake capacity of Mn(II) ions by zeolite A beads was investigated for different initial Mn concentration (100e400 mg Mn dm^-3) in batch mode at 25e55 C. The obtained adsorption capacity varying from 30 to 50 mg Mn g^-1 demonstrated a high affinity of zeolite A towards Mn(II) present in solutions. Kinetic studies indicated the intra-particle diffusion as the rate limiting step up to 45 C with apparent diffusivities in the range (1.2e2.0) x 10^-13 m2 s^-1 and the activation energy of 21.9 kJ mol^-1, which implies strong interactions between the zeolite A and Mn ions. At 55 C ion-exchange became the rate limiting step. The adsorption isotherms were studied at 25 C showing that the Mn adsorption is the best described by the Langmuir model suggesting a homogenous zeolite surface. XPS analysis of the Mnloaded beads showed that there is no surface accumulation of Mn but an almost uniform Mn distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was followed by the Mn(II) oxidation and oxide formation. Regeneration of the spent zeolite was examined in 8 adsorption/desorption cycles by a chelating Na2EDTA in a fluidized column. It has been found that zeolite A beads could be reused for at least 4 cycles with satisfactory Mn(II) adsorption efficiencies of about 70%.
Found in: ključnih besedah
Summary of found: ...distribution inside zeolite A, whereas XANES and EXAFS suggested that the adsorption of Mn(II) was...
Keywords: Zeolite A Manganese Adsorption kinetics EXAFS/XANES XPS
Published: 01.04.2016; Views: 2008; Downloads: 0
.pdf Fulltext (1,27 MB)

8.
Specific EXAFS tools in analysis of MoSI nanowires
Anton Meden, Alojz Kodre, Iztok Arčon, Jana Padežnik Gomilšek, Dragan Mihailović, 2006, original scientific article

Abstract: Specific EXAFS tools in analysis of MoSI nanowires
Found in: ključnih besedah
Keywords: EXAFS, MoSI, nanocevke, struktura
Published: 17.05.2016; Views: 1603; Downloads: 8
URL Fulltext (0,00 KB)

9.
X-ray absorption spectroscopy studies of the room-temperature ferromagnetic Fe-doped 6H-BaTiO[sub]3
I. Mikulska, Matjaž Valant, Iztok Arčon, Darja Lisjak, 2015, original scientific article

Found in: ključnih besedah
Summary of found: ...magnetni polprevodniki, barijev titan, EXAFS, ...
Keywords: magnetni polprevodniki, barijev titan, EXAFS
Published: 16.06.2016; Views: 1912; Downloads: 58
URL Fulltext (0,00 KB)

10.
XAS and micro-XRF analysis of mono and bi-metallic exopolysaccharide (FePd-EPS) bio-generated by K. oxytoca
Franco Baldi, Katarina Vogel-Mikuš, Michele Gallo, Oreste Piccolo, Stefano Paganelli, Iztok Arčon, 2016, published scientific conference contribution abstract

Abstract: Bacteria Klebsiella oxytoca (DSM 29614) secret a specific exopolysaccharide (EPS) in the presence of Fe(III)-citrate, as sole carbon and energy source, and produces after 7 days an iron gel precipitate (Fe-EPS) [1]. In the presence of palladium or other metal species, the culture of K. oxytoca can produce other mono or bimetal species (Pd-EPS, FePd-EPS) [2]. These bio-materials may be used as green biogenerated catalysts or for other biotechnological purposes. In this work we present the analysis of the morphology and the chemical state of the metals in mono and bi-metallic (Fe-EPS, Pd-EPS, FePd-EPS) complexes, by a combination of micro X-ray fluorescence, X-ray absorption spectroscopy methods (XANES and EXAFS), and transmission electron microscopy. The results show that iron in monometallic Fe-EPS and bimetalic FePd-EPS is in the mineralized form of iron oxides/hydroxides, predominantly in the form of Fe3+, with a small amount of Fe2+ in the structure, as a mixture of different nano-crystalline iron oxides and hydroxides. Palladium on the other hand is found as Pd(0) in the form of metallic nanoparticles with fcc structure in both, bi-metallic (FePd-EPS) and mono-metallic (Pd-EPS) species. In bi-metallic species Pd and Fe nanoparticles agglomerate in larger clusters, but they remain spatially separated. Access to the SR facilities at ESRF (beamline ID21, project LS-2225), DESY (beamline C) Hamburg (project I-20110511 EC) and ELETTRA (beamline XAFS, project 20115112) is acknowledged.
Found in: ključnih besedah
Summary of found: ...fluorescence, X-ray absorption spectroscopy methods (XANES and EXAFS), and transmission electron microscopy. The results show...
Keywords: Klebsiella oxytoca, Fe, Pd, XANES, EXAFS, exopolysaccharide, FePd-EPS
Published: 28.06.2016; Views: 2512; Downloads: 0
.pdf Fulltext (388,27 KB)

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