X-ray Absorption Spectroscopy and Coherent X-ray Diffraction Imaging for Time-Resolved Investigation of the Biological Complexes: Computer Modelling towards the XFEL Experiment

<div>The development of time-resolved in situ approaches for monitoring mechanochemical</div><div>transformations has revolutionized the field of mechanochemistry. Currently, the established in</div><div>situ approaches greatly limit the scope of investigations that are possible. Here we develop a new</div><div>approach to simultaneously follow the evolution of bulk atomic and electronic structure during a</div><div>mechanochemical synthesis. This is achieved by coupling two complementary synchrotron-based</div><div>X-ray methods: X-ray absorption spectroscopy and X-ray diffraction. We apply this method to</div><div>investigate the bottom-up mechanosynthesis of technologically important Au nanoparticles in the</div><div>presence of three different reducing agents. Moreover, we demonstrate how X-ray absorption</div><div>spectroscopy offers unprecedented insight into the early stage generation of growth species (e.g.</div><div>monomers and clusters), which lead to the subsequent formation of nanoparticles. These</div><div>processes are beyond the detection capabilities of diffraction methods. The approach is general,</div><div>and not limited to monitoring NP mechanosynthesis. This combined X-ray approach paves the</div><div>way to new directions in mechanochemical research of advanced electronic materials.</div>

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Electrochemical Oxidation and Reduction Processes of Platinum Nanoparticles Probed by Time-resolved High-energy X-ray Diffraction and X-ray Absorption Spectroscopy

ECS Meeting Abstracts ◽

10.1149/ma2006-01/5/302 ◽

2006 ◽

Keyword(s):

Electrochemical Oxidation ◽

Absorption Spectroscopy ◽

Platinum Nanoparticles ◽

High Energy ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray ◽

Reduction Processes ◽

X Ray Absorption

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Expanding the Mechanochemical Toolbox: Combining X-Ray Absorption Spectroscopy and Scattering for in Situ Time-Resolved Monitoring of Gold Nanoparticle Mechanosynthesis

10.26434/chemrxiv.12290756.v1 ◽

2020 ◽

Author(s):

Paulo F M de Oliveira ◽

Adam Michalchuk ◽

Ana de Oliveira Guilherme Buzanich ◽

Ralf Bienert ◽

Roberto M. Torresi ◽

...

Keyword(s):

Absorption Spectroscopy ◽

Electronic Materials ◽

Early Stage ◽

X Ray Diffraction ◽

Time Resolved ◽

Subsequent Formation ◽

X Ray ◽

Detection Capabilities ◽

X Ray Absorption

<div>The development of time-resolved in situ approaches for monitoring mechanochemical</div><div>transformations has revolutionized the field of mechanochemistry. Currently, the established in</div><div>situ approaches greatly limit the scope of investigations that are possible. Here we develop a new</div><div>approach to simultaneously follow the evolution of bulk atomic and electronic structure during a</div><div>mechanochemical synthesis. This is achieved by coupling two complementary synchrotron-based</div><div>X-ray methods: X-ray absorption spectroscopy and X-ray diffraction. We apply this method to</div><div>investigate the bottom-up mechanosynthesis of technologically important Au nanoparticles in the</div><div>presence of three different reducing agents. Moreover, we demonstrate how X-ray absorption</div><div>spectroscopy offers unprecedented insight into the early stage generation of growth species (e.g.</div><div>monomers and clusters), which lead to the subsequent formation of nanoparticles. These</div><div>processes are beyond the detection capabilities of diffraction methods. The approach is general,</div><div>and not limited to monitoring NP mechanosynthesis. This combined X-ray approach paves the</div><div>way to new directions in mechanochemical research of advanced electronic materials.</div>

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In Situ Investigation of the Thermal Decomposition of Ammonium Tetrathiomolybdate Using Combined Time-Resolved X-ray Absorption Spectroscopy and X-ray Diffraction

Chemistry of Materials ◽

10.1021/cm980716h ◽

1998 ◽

Vol 10 (11) ◽

pp. 3737-3745 ◽

Cited By ~ 38

Author(s):

Richard I. Walton ◽

Andrew J. Dent ◽

Simon J. Hibble

Keyword(s):

Thermal Decomposition ◽

Absorption Spectroscopy ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray ◽

In Situ Investigation ◽

Ammonium Tetrathiomolybdate ◽

X Ray Absorption

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Time resolved X-ray absorption spectroscopy studies of metalloenzymes reveal mechanistic information beyond kinetics

Acta Crystallographica Section A Foundations of Crystallography ◽

10.1107/s0108767302092553 ◽

2002 ◽

Vol 58 (s1) ◽

pp. c188-c188

Author(s):

I. Sagi ◽

G. Rosenblum ◽

O. Kleifeld ◽

A. Frenkel

Keyword(s):

Absorption Spectroscopy ◽

Time Resolved ◽

X Ray ◽

Spectroscopy Studies ◽

X Ray Absorption

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The Relative Merits of Oxides of Hafnium, Cerium and Thorium as Surrogates for Plutonium Oxide in Calcium Phosphate Ceramics

MRS Proceedings ◽

10.1557/proc-1193-79 ◽

2009 ◽

Vol 1193 ◽

Cited By ~ 1

Author(s):

B. L. Metcalfe ◽

S. K. Fong ◽

L. A. Gerrard ◽

I. W. Donald ◽

E. S. Welch ◽

...

Keyword(s):

Calcium Phosphate ◽

Calcination Temperature ◽

Cerium Oxide ◽

Absorption Spectroscopy ◽

Hafnium Oxide ◽

Intermediate Level ◽

X Ray Diffraction ◽

X Ray ◽

X Ray Absorption ◽

Additional Phase

AbstractThe choice of surrogate for plutonium oxide for use during the initial stages of research into the immobilization of intermediate level pyrochemical wastes containing plutonium andamericium oxides in a calcium phosphate host has been investigated by powder X-ray diffraction and X-ray absorption spectroscopy. Two non-radioactive surrogates, hafnium oxide and cerium oxide, together with radioactive thorium oxide were compared. Similarities in behaviour were observed for all three surrogates when calcined at the lowest temperature, 750°C but differences became more pronounced as the calcination temperature was increased to 950°C. Although some reaction occurred between all the surrogates and the host to form a substituted whitlockite phase, increasing the temperature led to a significant increase in the cerium reaction and the formation of an additional phase, monazite. Additionally it was observed that the cerium became increasingly trivalent at higher temperatures.

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