Dynamic X-Ray Diffraction Computed Tomography Reveals Real-Time Insight into Catalyst Active Phase Evolution

2011 ◽  
Vol 123 (43) ◽  
pp. 10330-10334 ◽  
Author(s):  
Simon D. M. Jacques ◽  
Marco Di Michiel ◽  
Andrew M. Beale ◽  
Taha Sochi ◽  
Matthew G. O'Brien ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Real Time ◽  
Active Phase ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Insight Into

Back Cover: Dynamic X-Ray Diffraction Computed Tomography Reveals Real-Time Insight into Catalyst Active Phase Evolution (Angew. Chem. Int. Ed. 43/2011)

2011 ◽  
Vol 50 (43) ◽  
pp. 10255-10255 ◽  
Author(s):  
Simon D. M. Jacques ◽  
Marco Di Michiel ◽  
Andrew M. Beale ◽  
Taha Sochi ◽  
Matthew G. O'Brien ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Real Time ◽  
Active Phase ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Back Cover ◽  
Insight Into

Rücktitelbild: Dynamic X-Ray Diffraction Computed Tomography Reveals Real-Time Insight into Catalyst Active Phase Evolution (Angew. Chem. 43/2011)

2011 ◽  
Vol 123 (43) ◽  
pp. 10437-10437 ◽  
Author(s):  
Simon D. M. Jacques ◽  
Marco Di Michiel ◽  
Andrew M. Beale ◽  
Taha Sochi ◽  
Matthew G. O'Brien ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Real Time ◽  
Active Phase ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Insight Into

Dynamic X-Ray Diffraction Computed Tomography Reveals Real-Time Insight into Catalyst Active Phase Evolution

2011 ◽  
Vol 50 (43) ◽  
pp. 10148-10152 ◽  
Author(s):  
Simon D. M. Jacques ◽  
Marco Di Michiel ◽  
Andrew M. Beale ◽  
Taha Sochi ◽  
Matthew G. O'Brien ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Real Time ◽  
Active Phase ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Insight Into

Examples of Hydrothermal Titration and Real Time X-Ray Diffraction in the Synthesis of Open Frameworks

1996 ◽  
Vol 453 ◽  
Author(s):  
J. B. Parise ◽  
K. Tan ◽  
P. Norby ◽  
Y. Ko ◽  
C. Cahill
Keyword(s):  
Real Time ◽  
Ammonium Hydroxide ◽  
Continuous Exposure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthetic Strategy ◽  
X Ray Scattering ◽  
Different Temperatures ◽  
Imaging Plates ◽  
Insight Into

AbstractHydrothermal titration (HTT) techniques represent a new synthetic strategy for the production of open frameworks. As an example, initial digestion of amorphous GeS2 in the presence of tetraethyl ammonium hydroxide (TEAOH) at 100°C is followed by injection of Ag+ into this mixture to condense the [Ge4S10]4− clusters and form a framework consisting of 8-ring channels bounded by alternating GeS-clusters and Ag+. The rational use of this apparatus depends upon determining the timing of injection. Insight into the changes occurring during reactant digestion is provided by real time synchrotron X-ray powder diffraction. Changes in the the system dimethylamine-Sb-S have been followed in real time at different temperatures. The transformation from mixtures of DMA, Sb and S to the known open phase DMA-SbS-SB8 was followed by observing monochromatic X-ray scattering detected on an imaging plates over a 8 hr period with one continuous exposure.

scholarly journals Design of next-generation ceramic fuel cells and real-time characterization with synchrotron X-ray diffraction computed tomography

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Tao Li ◽  
Thomas M. M. Heenan ◽  
Mohamad F. Rabuni ◽  
Bo Wang ◽  
Nicholas M. Farandos ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Fuel Cells ◽  
Real Time ◽  
Next Generation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ceramic Fuel ◽  
Ceramic Fuel Cells

scholarly journals Mining Wastes of an Albite Deposit as Raw Materials for Vitrified Mullite Ceramics

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 232
Author(s):  
Pedro J. Sánchez-Soto ◽  
Eduardo Garzón ◽  
Luis Pérez-Villarejo ◽  
George N. Angelopoulos ◽  
Dolores Eliche-Quesada
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Phase Evolution ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Mining Wastes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Value

In this work, an examination of mining wastes of an albite deposit in south Spain was carried out using X-ray Fluorescence (XRF), X-ray diffraction (XRD), particle size analysis, thermo-dilatometry and Differential Thermal Analysis (DTA) and Thermogravimetric (TG) analysis, followed by the determination of the main ceramic properties. The albite content in two selected samples was high (65–40 wt. %), accompanied by quartz (25–40 wt. %) and other minor minerals identified by XRD, mainly kaolinite, in agreement with the high content of silica and alumina determined by XRF. The content of Na2O was in the range 5.44–3.09 wt. %, being associated with albite. The iron content was very low (<0.75 wt. %). The kaolinite content in the waste was estimated from ~8 to 32 wt. %. The particle size analysis indicated values of 11–31 wt. % of particles <63 µm. The ceramic properties of fired samples (1000–1350 °C) showed progressive shrinkage by the thermal effect, with water absorption and open porosity almost at zero at 1200–1250 °C. At 1200 °C, the bulk density reached a maximum value of 2.38 g/cm3. An abrupt change in the phase evolution by XRD was found from 1150 to 1200 °C, with the disappearance of albite by melting in accordance with the predictions of the phase diagram SiO2-Al2O3-Na2O and the system albite-quartz. These fired materials contained as main crystalline phases quartz and mullite. Quartz was present in the raw samples and mullite was formed by decomposition of kaolinite. The observation of mullite forming needle-shape crystals was revealed by Scanning Electron Microscopy (SEM). The formation of fully densified and vitrified mullite materials by firing treatments was demonstrated.

scholarly journals A Study of Thin Film Resistors Prepared Using Ni-Cr-Si-Al-Ta High Entropy Alloy

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Ruei-Cheng Lin ◽  
Tai-Kuang Lee ◽  
Der-Ho Wu ◽  
Ying-Chieh Lee
Keyword(s):  
Annealing Temperature ◽  
Phase Evolution ◽  
Amorphous Structure ◽  
High Entropy Alloy ◽  
X Ray Diffraction ◽  
Temperature Coefficient Of Resistance ◽  
X Ray ◽  
High Entropy ◽  
Transmission Electron ◽  
Thin Film Resistors

Ni-Cr-Si-Al-Ta resistive thin films were prepared on glass and Al2O3substrates by DC magnetron cosputtering from targets of Ni0.35-Cr0.25-Si0.2-Al0.2casting alloy and Ta metal. Electrical properties and microstructures of Ni-Cr-Si-Al-Ta films under different sputtering powers and annealing temperatures were investigated. The phase evolution, microstructure, and composition of Ni-Cr-Si-Al-Ta films were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Auger electron spectroscopy (AES). When the annealing temperature was set to 300°C, the Ni-Cr-Si-Al-Ta films with an amorphous structure were observed. When the annealing temperature was at 500°C, the Ni-Cr-Si-Al-Ta films crystallized into Al0.9Ni4.22, Cr2Ta, and Ta5Si3phases. The Ni-Cr-Si-Al-Ta films deposited at 100 W and annealed at 300°C which exhibited the higher resistivity 2215 μΩ-cm with −10 ppm/°C of temperature coefficient of resistance (TCR).

scholarly journals Investigation of Solvatomorphism and Its Photophysical Implications for Archetypal Trinuclear Au3(1-Methylimidazolate)3

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4404
Author(s):  
Shengyang Guan ◽  
David C. Mayer ◽  
Christian Jandl ◽  
Sebastian J. Weishäupl ◽  
Angela Casini ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Density Functional ◽  
Bulk Material ◽  
Variable Temperature ◽  
Active Phase ◽  
Solvent Free ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aurophilic Interactions

A new solvatomorph of [Au3(1-Methylimidazolate)3] (Au3(MeIm)3)—the simplest congener of imidazolate-based Au(I) cyclic trinuclear complexes (CTCs)—has been identified and structurally characterized. Single-crystal X-ray diffraction revealed a dichloromethane solvate exhibiting remarkably short intermolecular Au⋯Au distances (3.2190(7) Å). This goes along with a dimer formation in the solid state, which is not observed in a previously reported solvent-free crystal structure. Hirshfeld analysis, in combination with density functional theory (DFT) calculations, indicates that the dimerization is generally driven by attractive aurophilic interactions, which are commonly associated with the luminescence properties of CTCs. Since Au3(MeIm)3 has previously been reported to be emissive in the solid-state, we conducted a thorough photophysical study combined with phase analysis by means of powder X-ray diffraction (PXRD), to correctly attribute the photophysically active phase of the bulk material. Interestingly, all investigated powder samples accessed via different preparation methods can be assigned to the pristine solvent-free crystal structure, showing no aurophilic interactions. Finally, the observed strong thermochromism of the solid-state material was investigated by means of variable-temperature PXRD, ruling out a significant phase transition being responsible for the drastic change of the emission properties (hypsochromic shift from 710 nm to 510 nm) when lowering the temperature down to 77 K.

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