Dehydrogenation kinetics of air-exposed MgH2/Mg2Cu and MgH2/MgCu2 studied with in situ X-ray powder diffraction

2005 ◽  
Vol 82 (3) ◽  
pp. 515-521 ◽  
Author(s):  
A. Andreasen ◽  
M.B. Sørensen ◽  
R. Burkarl ◽  
B. Møller ◽  
A.M. Molenbroek ◽  
...  
Keyword(s):  
Powder Diffraction ◽  
X Ray ◽  
Dehydrogenation Kinetics ◽  
Kinetics Of

In situsimultaneous Raman/high-resolution X-ray powder diffraction study of transformations occurring in materials at non-ambient conditions

2007 ◽  
Vol 40 (4) ◽  
pp. 684-693 ◽  
Author(s):  
Enrico Boccaleri ◽  
Fabio Carniato ◽  
Gianluca Croce ◽  
Davide Viterbo ◽  
Wouter van Beek ◽  
...  
Keyword(s):  
Solid State ◽  
High Resolution ◽  
Powder Diffraction ◽  
Added Value ◽  
Experimental Setup ◽  
Ambient Conditions ◽  
X Ray ◽  
Uv Lamp ◽  
Kinetics Of

Materials containing disordered moieties and/or amorphous or liquid-like phases or showing surface- or defect-related phenomena constitute a problem with respect to their characterization using X-ray powder diffraction (XRPD), and in many cases Raman spectroscopy can provide useful complementary information. A novel experimental setup has been designed and realized for simultaneousin situRaman/high-resolution XRPD experiments, to take full advantage of the complementarities of the two techniques in investigating solid-state transformations under non-ambient conditions. The added value of the proposed experiment is the perfect synchronization of the two probes with the reaction coordinate and the elimination of possible bias caused by different sample holders and conditioning modes used in `in situbut separate' approaches. The setup was tested on three solid-state transformations: (i) the kinetics of the fluorene–TCNQ solid-state synthesis, (ii) the thermal swelling and degradation of stearate–hydrotalcite, and (iii) the photoinduced (2 + 2)-cyclization of (E)-furylidenoxindole. These experiments demonstrated that, even though the simultaneous Raman/XRPD experiment is more challenging than separate procedures, high-resolution XRPD and Raman data can be collected. A gas blower allows studies from room temperature to 700 K, and 100 K can be reached using a nitrogen cryostream. The flexibility of the experimental setup allows the addition of ancillary devices, such as a UV lamp used to study photoreactivity.

Kinetics of Methane Hydrate Decomposition Studied via in Situ Low Temperature X-ray Powder Diffraction

2013 ◽  
Vol 117 (17) ◽  
pp. 3593-3598 ◽  
Author(s):  
S. Michelle Everett ◽  
Claudia J. Rawn ◽  
David J. Keffer ◽  
Derek L. Mull ◽  
E. Andrew Payzant ◽  
...  
Keyword(s):  
Low Temperature ◽  
Powder Diffraction ◽  
Methane Hydrate ◽  
X Ray ◽  
Hydrate Decomposition ◽  
Kinetics Of

Dehydrogenation kinetics of pure and nickel-doped magnesium hydride investigated by in situ time-resolved powder X-ray diffraction

2006 ◽  
Vol 31 (14) ◽  
pp. 2052-2062 ◽  
Author(s):  
T JENSEN ◽  
A ANDREASEN ◽  
T VEGGE ◽  
J ANDREASEN ◽  
K STAHL ◽  
...  
Keyword(s):  
Magnesium Hydride ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Dehydrogenation Kinetics ◽  
Kinetics Of

Kinetics of the Decomposition of Crocidolite Asbestos: A Preliminary Real-Time X-Ray Powder Diffraction Study

2004 ◽  
Vol 443-444 ◽  
pp. 291-294 ◽  
Author(s):  
A.F. Gualtieri ◽  
D. Levy ◽  
M. Dapiaggi ◽  
E. Belluso
Keyword(s):  
Real Time ◽  
Powder Diffraction ◽  
Ion Diffusion ◽  
Kcal Mole ◽  
X Ray ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Rate Limiting ◽  
Kinetics Of

This work is a preliminary kinetic study of the crocidolite decomposition followed in situ at high temperature using real time conventional powder diffraction and DTA in the temperature range 720-795 °C. The data analysis using the Avrami models indicates that the rate limiting step of the reaction is monodimensional ion diffusion (n=0.5) with an activation energy of 129 (10)kcal/mole.

Kinetics of ${\rm MgB}_{2}$ Formation Studied by in-situ Synchrotron X-Ray Powder Diffraction

2007 ◽  
Vol 17 (2) ◽  
pp. 2757-2760 ◽  
Author(s):  
A.B. Abrahamsen ◽  
J-C. Grivel ◽  
N.H. Andersen ◽  
J. Homeyer ◽  
K. Saksl
Keyword(s):  
Powder Diffraction ◽  
X Ray ◽  
Kinetics Of

Monitoring Polymer-Assisted Mechanochemical Cocrystallisation Through in Situ X-Ray Powder Diffraction

2020 ◽  
Author(s):  
Luzia S. Germann ◽  
Sebastian T. Emmerling ◽  
Manuel Wilke ◽  
Robert E. Dinnebier ◽  
Mariarosa Moneghini ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Powder Diffraction ◽  
Reaction Rate ◽  
Polymer Additives ◽  
Time Resolved ◽  
X Ray

Time-resolved mechanochemical cocrystallisation studies have so-far focused solely on neat and liquid-assisted grinding. Here, we report the monitoring of polymer-assisted grinding reactions using <i>in situ</i> X-ray powder diffraction, revealing that reaction rate is almost double compared to neat grinding and independent of the molecular weight and amount of used polymer additives.<br>

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

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