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10 results for “Thermal decomposition”
Long term response of arctic tussock tundra to thermal erosion features: A modeling analysis. Tussock tundra regrowth after a thermal erosion event: Simulation J - doubled Phase II decomposition
The Multiple Element Limitation (MEL) model is used to simulate the recovery of Alaskan arctic tussock tundra to thermal erosion features (TEFs) caused by permafrost thaw and mass wasting. TEFs could be significant to regional carbon (C) and nutrient budgets because permafrost soils contain large stocks of soil organic matter (SOM) and TEFs are expected to become more frequent as climate warms. These simulations deal only with recovery following TEF stabilization and do not address initial losses of C and nutrients during TEF formation. To capture the variability among and within TEFs, we simulate a range of post-stabilization conditions by varying the initial size of SOM pools and nutrient supply rates. This file contains the results for 100 years of tussock tundra recovery after a thermal erosion event. This simulation is of TEF recovery with doubled Phase II soil organic matter decomposition compared to the base simulation. Data is presented for day 250 of each year.
Long term response of arctic tussock tundra to thermal erosion features: A modeling analysis. Tussock tundra regrowth after a thermal erosion event: Simulation I - doubled Phase I decomposition
The Multiple Element Limitation (MEL) model is used to simulate the recovery of Alaskan arctic tussock tundra to thermal erosion features (TEFs) caused by permafrost thaw and mass wasting. TEFs could be significant to regional carbon (C) and nutrient budgets because permafrost soils contain large stocks of soil organic matter (SOM) and TEFs are expected to become more frequent as climate warms. These simulations deal only with recovery following TEF stabilization and do not address initial losses of C and nutrients during TEF formation. To capture the variability among and within TEFs, we simulate a range of post-stabilization conditions by varying the initial size of SOM pools and nutrient supply rates. This file contains the results for 100 years of tussock tundra recovery after a thermal erosion event. This simulation is of TEF recovery with doubled Phase I soil organic matter decomposition compared to the base simulation. Data is presented for day 250 of each year.
Thermal decomposition data of uranium containing microspheres produced via internal gelation and ammonium diuranate powder
<p>A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the thermal decomposition behaviour in the NH<sub>3</sub> − UO<sub>3</sub> − H<sub>2</sub>O class of materials.</p> <p>One compound was prepared according to a typical ammonium diuranate precipitation reaction, and could be identified as 3UO<sub>3</sub>·NH<sub>3</sub>·5H<sub>2</sub>O. Microspheres prepared by the sol-gel method via internal gelation were associated to the composition 3UO<sub>3</sub>·2NH<sub>3</sub>·4H<sub>2</sub>O under the specified conditions.</p> <p>The products were analysed using the techniques listed below, the resulting data are part of this dataset.</p> <ul> <li>TGA, combined with EGA-MS (<em>T<sub>max</sub></em> = 1300 °C, heating rate = 2 °C/min)</li> <li>TG-DSC, combined with EGA-MS (<em>T<sub>max</sub></em> = 1300 °C, heating rate = 10 °C/min)</li> <li>ambient XRD (dried products after synthesis)</li> <li><em>in-situ</em> high temperature XRD (including initial and final scans, taken at 35 °C) <ul> <li><em>T<sub>max</sub></em> for 3UO<sub>3</sub>·NH<sub>3</sub>·5H<sub>2</sub>O = 1300 °C; <em>T<sub>max</sub></em> for 3UO<sub>3</sub>·2NH<sub>3</sub>·4H<sub>2</sub>O = 650 °C</li> <li>Samples measured directly on a Pt/Rh heating strip (Pt/Rh phase visible in patterns, blank scan included)</li> </ul> </li> </ul>
Data of uranyl-, Nd-, Ce-hydrolysis and their mixtures induced by thermal decomposition of urea
<p>The hydrolysis of UO<sub>2</sub><sup>2+</sup>, Nd<sup>III</sup> , Ce<sup>III</sup> and Ce<sup>IV</sup> cations, induced by thermal decomposition of urea, was studied. Moreover, we investigated binary mixtures of uranyl and the lanthanides, as well as ternary mixtures of uranyl and both lanthanides using Ce<sup>III</sup> or Ce<sup>IV</sup>. The impact of the urea content and the temperature on the reaction kinetics and the formed precipitate was evaluated and the results are in depth discussed in <a href="https://doi.org/10.1002/ejic.202100453">our article</a>, some results are also summarised in <a href="https://doi.org/10.5281/zenodo.5034714">this presentation</a>.</p> <p>Uranyl ions precipitated as ammonium diuranate (ADU) with different stoichiometry under the applied conditions. Nd<sup>III</sup> and Ce<sup>III</sup> cations showed a comparable pH evolution during hydrolysis and <em>Ln</em>CO<sub>3</sub>OH products were identified, whereas Ce<sup>IV</sup> hydrolysed at a lower pH and formed nanocrystalline CeO<sub>2</sub>. Depending on the urea content, a partial co-precipitation was observed for mixtures of UO<sub>2</sub><sup>2+</sup> and Nd<sup>III</sup>. The products of Ce<sup>III</sup> and Ce<sup>IV</sup> hydrolysis were also identified in the precipitates of binary uranyl and cerium mixtures. For ternary U/Nd/Ce mixtures, a simultaneous precipitation of Nd<sup>III</sup> and Ce<sup>III</sup> and a partial incorporation of the <em>Ln</em> phase into the ADU phase was observed, whereas the presence of Ce<sup>IV</sup>/CeO<sub>2</sub> resulted in three individual phases. The precipitation reaction was followed by monitoring the pH evolution and the metal concentration in the supernatant, applying UV/Vis and ICP-MS. The formed precipitates were characterised by XRD and SEM.</p> <p>The data accrued during the study are part of this data set. Please note that the provision of this dataset is based on a voluntary basis. You are welcome to use the data from this set in your work. If you do so and publish resulting findings, please cite our work as required by the license.</p>
Effect of long-term aging on graphene oxide: structure and thermal decomposition
<p>FTIR, XRD, Raman, AFM, XPS were used to characterize graphene oxide aged for 2 years. The results showed that after aging, the C/O ratio of graphene oxide increased from 1.96 to 2.76, but the type of oxygen-containing functional groups did not change. In addition to oxygen-containing functional groups, the content of -CH3, -CH2- and physically adsorbed water also decreased. The change in the structure is manifested by the reduction of the average interlayer distance from 1.320 nm to 1.134 nm. Moreover, ID/IG increased from 0.95 to 1.03, indicating that the defect density in the carbon skeleton increased after aging. The thermal decomposition process of graphene oxide and its decomposition products were analyzed by thermogravimetric combined with Infrared spectroscopy. When the temperature exceeds 60°C, the infrared signal of CO2 produced by the decomposition of graphene oxide can be detected. After aging, the decomposition peak temperature of graphene oxide decreased from 216 to 195°C. The amount of CO2 produced in the decomposition products is almost unchanged, while the amount of CO and H2O produced decreases, and the amount of SO2 produced decreases significantly. The OH radicals and heat accumulated during the decomposition process may in turn accelerate the decomposition rate, leading to a thermal runaway process at 216°C.</p>
Thermal adaptation of microbial respiration persists throughout long-term soil carbon decomposition
<p>The microbial respiration data supporting the main findings of the study titled 'Thermal adaptation of microbial respiration persists throughout long-term soil carbon decomposition'. Mass-specific microbial respiration was consistently lower under higher long-term incubation temperatures, suggesting the occurrence and persistence of microbial thermal adaptation in long-term soil carbon decomposition.</p>
Effect of long-term aging on graphene oxide: structure and thermal decomposition
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Characterization of the Shape Anisotropy of Superparamagnetic Iron Oxide Nanoparticles during Thermal Decomposition
<p>Magnetosomes are near-perfect intracellular magnetite nanocrystals found in magnetotactic bacteria. Their synthetic imitation, known as superparamagnetic iron oxide nanoparticles (SPIONs), have found applications in a variety of (nano)medicinal fields such as magnetic resonance imaging contrast agents, multimodal imaging and drug carriers. In order to perform these functions in medicine, shape and size control of the SPIONs is vital. We sampled SPIONs at ten-minutes intervals during the high-temperature thermal decomposition reaction. Their shape (sphericity and anisotropy) and geometric description (volume and surface area) were retrieved using three-dimensional imaging techniques, which allowed to reconstruct each particle in three dimensions, followed by stereological quantification methods. The results, supported by small angle X-ray scattering characterization, reveal that SPIONs initially have a spherical shape, then grow increasingly asymmetric and irregular. A high heterogeneity in volume at the initial stages makes place for lower particle volume dispersity at later stages. The SPIONs settled into a preferred orientation on the support used for transmission electron microscopy imaging, which hides the extent of their anisotropic nature in the axial dimension, there by biasing the interpretation of standard 2D micrographs. This information could be feedback into the design of the chemical processes and the characterization strategies to improve the current applications of SPIONs in nanomedicine.</p>
Experimental raw data for "Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine"
<p>LICENSE: These data are made available under the Public Domain Dedication and License v1.0 whose full text can be found at: http://opendatacommons.org/licenses/pddl/1.0/</p> <p><br> This is the repository of all experimental raw data used in the Scientific Reports publication "Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine" by Daniel Dittmann, Paul Eisentraut, Caroline Goedecke, Yosri Wiesner, Martin Jekel, Aki Sebastian Ruhl, and Ulrike Braun.</p> <p>It includes<br> - overview_measurements.xlsx and overview_measurements.ods containing a list of all TGA experiments (TGA, TGA-FTIR, TED-GC-MS, and ramp-kinetics)<br> - TED-GC-MS.zip containing gas chromatography-mass spectrometry experimtent files for the Chemstation and OpenChrom<br> - TGA.zip containing thermogravimetric analyses raw data on evolved gas analyses experiments (TGA-FTIR and TED-GC-MS)<br> - TGA_kinetics.zip containing thermogravimetric analyses raw data on decomposition kinetic experiments (ramp-kinetics)<br> - TGA-FTIR.zip containing Fourier-transform infrared spectroscopy series files for OMNIC<br> - XRF.zip containing x-ray flourescence data on elemental composition</p>
Thermal decomposition of hexamethylenetetramine: mechanistic study and identification of reaction intermediates via a computational and NMR approach
<p>FID of the NMR spectra of the manuscript entitled: Thermal decomposition of hexamethylenetetramine: mechanistic study and identification of reaction intermediates via a computational and NMR approach</p>
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