scholarly journals On the mechanism of rapid metal exchange between thiolate-protected gold and gold/silver clusters: a time-resolved in situ XAFS study

2018 ◽  
Vol 20 (7) ◽  
pp. 5312-5318 ◽  
Author(s):  
Bei Zhang ◽  
Olga V. Safonova ◽  
Stephan Pollitt ◽  
Giovanni Salassa ◽  
Annelies Sels ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Silver Clusters ◽  
Metal Exchange ◽  
Time Resolved ◽  
X Ray ◽  
Gold Silver ◽  
In Situ Xafs ◽  
Metal Exchange Reaction ◽  
X Ray Absorption

The fast metal exchange reaction between Au38 and AgxAu38−x nanoclusters has been studied by time resolved in situ X-ray absorption spectroscopy.

Kinetic analysis of Ag particle redispersion into ZSM-5 in the presence of coke using in situ XAFS

2021 ◽  
Author(s):  
Kazumasa Murata ◽  
Junya Ohyama ◽  
Atsushi Satsuma
Keyword(s):  
Fine Structure ◽  
Kinetic Analysis ◽  
X Ray ◽  
Xafs Spectroscopy ◽  
Absorption Fine ◽  
Ag Particles ◽  
In Situ Xafs ◽  
Ag Particle ◽  
X Ray Absorption

In the present study, the redispersion behavior of Ag particles on ZSM-5 in the presence of coke was observed using in situ X-ray absorption fine structure (XAFS) spectroscopy.

scholarly journals Tandem X-ray absorption spectroscopy and scattering for in situ time-resolved monitoring of gold nanoparticle mechanosynthesis

2020 ◽  
Vol 56 (71) ◽  
pp. 10329-10332 ◽  
Author(s):  
Paulo F. M. de Oliveira ◽  
Adam A. L. Michalchuk ◽  
Ana Guilherme Buzanich ◽  
Ralf Bienert ◽  
Roberto M. Torresi ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Absorption Spectroscopy ◽  
Mechanochemical Synthesis ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption

A new tandem approach combines XRD and XANES for time-resolved in situ monitoring of the mechanochemical synthesis of gold nanoparticles.

In situ time resolved studies of hydride and deuteride formation in Pd/C electrodes via energy dispersive X-ray absorption spectroscopy

2005 ◽  
Vol 7 (2) ◽  
pp. 366-372 ◽  
Author(s):  
A. Rose ◽  
O. South ◽  
I. Harvey ◽  
S. Diaz-Moreno ◽  
J. R. Owen ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Energy Dispersive ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption

X-Ray Absorption Spectroscopy as an in-situ Tool in Materials Science

1997 ◽  
Vol 502 ◽  
Author(s):  
T. Ressler ◽  
Joe Wong ◽  
W. Metz
Keyword(s):  
Absorption Spectroscopy ◽  
Materials Science ◽  
Ex Situ ◽  
Structural Studies ◽  
Time Resolved ◽  
X Ray ◽  
Complementary Techniques ◽  
X Ray Absorption ◽  
Established Technique

ABSTRACTIn addition to being an established technique for ex-situ structural studies, x-ray absorption spectroscopy (XAS) has recently been realized to be a powerful tool for in-situ time-resolved investigations in materials science. This paper describes two complementary techniques: quick-scanning EXAFS (QEXAFS) and energy-dispersive XAS (DXAS) which offer time resolution in the seconds and milliseconds range, respectively. Formation of a heterogeneous catalyst from a solid-state reaction of a precursor is presented as an example of a time-resolved XAS application.

scholarly journals In situ time-resolved dispersive X-ray absorption fine structure analysis of BaTiO3–LiCoO2 composites for lithium ion batteries

2016 ◽  
Vol 124 (6) ◽  
pp. 659-663 ◽  
Author(s):  
Takashi TERANISHI ◽  
Yumi YOSHIKAWA ◽  
Ryota MIYAHARA ◽  
Hidetaka HAYASHI ◽  
Akira KISHIMOTO ◽  
...  
Keyword(s):  
Fine Structure ◽  
Lithium Ion Batteries ◽  
Structure Analysis ◽  
Lithium Ion ◽  
Time Resolved ◽  
X Ray ◽  
Absorption Fine ◽  
Fine Structure Analysis ◽  
X Ray Absorption

A dispenser–reactor apparatus applied forin situXAS monitoring of Pt nanoparticle formation

2015 ◽  
Vol 22 (3) ◽  
pp. 736-744 ◽  
Author(s):  
Jocenir Boita ◽  
Marcus Vinicius Castegnaro ◽  
Maria do Carmo Martins Alves ◽  
Jonder Morais
Keyword(s):  
Photoelectron Spectroscopy ◽  
Metallic Nanoparticles ◽  
Pt Nanoparticles ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Two Stages ◽  
X Ray Absorption

In situtime-resolved X-ray absorption spectroscopy (XAS) measurements collected at the PtL3-edge during the synthesis of Pt nanoparticles (NPs) in aqueous solution are reported. A specially designed dispenser–reactor apparatus allowed for monitoring changes in the XAS spectra from the earliest moments of Pt ions in solution until the formation of metallic nanoparticles with a mean diameter of 4.9 ± 1.1 nm. By monitoring the changes in the local chemical environment of the Pt atoms in real time, it was possible to observe that the NPs formation kinetics involved two stages: a reduction-nucleation burst followed by a slow growth and stabilization of NPs. Subsequently, the synthesized Pt NPs were supported on activated carbon and characterized by synchrotron-radiation-excited X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS). The supported Pt NPs remained in the metallic chemical state and with a reduced size, presenting slight lattice parameter contraction in comparison with the bulk Pt values.

The materials science X-ray beamline BL8 at the DELTA storage ring

2009 ◽  
Vol 16 (2) ◽  
pp. 264-272 ◽  
Author(s):  
Dirk Lützenkirchen-Hecht ◽  
Ralph Wagner ◽  
Ulrich Haake ◽  
Anke Watenphul ◽  
Ronald Frahm
Keyword(s):  
Materials Science ◽  
Photon Flux ◽  
Acquisition Time ◽  
Optical Components ◽  
Time Resolved ◽  
X Ray ◽  
Heavy Loads ◽  
Vacuum Systems ◽  
X Ray Absorption

The hard X-ray beamline BL8 at the superconducting asymmetric wiggler at the 1.5 GeV Dortmund Electron Accelerator DELTA is described. This beamline is dedicated to X-ray studies in the spectral range from ∼1 keV to ∼25 keV photon energy. The monochromator as well as the other optical components of the beamline are optimized accordingly. The endstation comprises a six-axis diffractometer that is capable of carrying heavy loads related to non-ambient sample environments such as, for example, ultrahigh-vacuum systems, high-pressure cells or liquid-helium cryostats. X-ray absorption spectra from several reference compounds illustrate the performance. Besides transmission measurements, fluorescence detection for dilute sample systems as well as surface-sensitive reflection-mode experiments have been performed. The results show that high-quality EXAFS data can be obtained in the quick-scanning EXAFS mode within a few seconds of acquisition time, enabling time-resolved in situ experiments using standard beamline equipment that is permanently available. The performance of the new beamline, especially in terms of the photon flux and energy resolution, is competitive with other insertion-device beamlines worldwide, and several sophisticated experiments including surface-sensitive EXAFS experiments are feasible.

Phase Transition Analysis between LiFePO4and FePO4by In-Situ Time-Resolved X-ray Absorption and X-ray Diffraction

2013 ◽  
Vol 160 (5) ◽  
pp. A3061-A3065 ◽  
Author(s):  
Yuki Orikasa ◽  
Takehiro Maeda ◽  
Yukinori Koyama ◽  
Taketoshi Minato ◽  
Haruno Murayama ◽  
...  
Keyword(s):  
Phase Transition ◽  
X Ray Diffraction ◽  
Transition Analysis ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Absorption
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