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1,043 Matching Results
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1,043
Functional Carbon Capsules Supporting Ruthenium Nanoclusters for Efficient Electrocatalytic 99TcO4-/ReO4 Removal from Acidic and Alkaline Nuclear Wastes
Article describes how the selective removal of the β-emitting pertechnetate ion (99TcO4−) from nuclear waste streams is technically challenging. In this article, a practical approach is proposed for the selective removal of 99TcO4− (or its surrogate ReO4−) under extreme conditions of high acidity, alkalinity, ionic strength, and radiation field.
Date:
September 10, 2023
Creator:
Liu, Xiaolu; Xie, Yinghui; Li, Yang; Hao, Mengjie; Chen, Zhongshan; Yang, Hui et al.
Object Type:
Article
System:
The UNT Digital Library
A Novel ppb-Level Sensitive and Highly Selective Europium-Based Diketone Luminescent Sensor for the Quantitative Detection of Aluminum Ions in Water Samples
Article describes how a novel Eu(tta)3([4,4′-(t-bu)2-2,2′-bpy)] complex (tta-thenoyltrifluoroacetone), a ratiometric luminescent-based optical sensor for the quantitative determination of aluminum ion, is synthesized and characterized using XRD and 1H NMR. The sensor reported here is tested for 11 common cations and shows no interference on sensitivity. According to the authors, this is the first known Eu-based luminescence sensor that successfully exhibited the ability to detect aluminum ions in ppb levels in aqueous environments.
Date:
November 6, 2023
Creator:
Rajitha Perera, Nawagamu A. K.; Shankar, Sindhu K.; Archambault, Cynthia M.; Nesterov, Vladimir N.; Marpu, Sreekar; Yan, Hao et al.
Object Type:
Article
System:
The UNT Digital Library
Enhanced Corrosion Resistance and Surface Wettability of PVDF/ZnO and PVDF/TiO2 Composite Coatings: A Comparative Study
Article describes how this study aims to enhance the practical performance of PVDF/ZnO and PVDF/TiO2 composite coatings known for their distinctive properties. The coatings, applied through spray coating with PVDF and ZnO or TiO2 nanoparticles on glass, steel, and aluminum substrates, underwent a comprehensive evaluation.
Date:
October 4, 2023
Creator:
Mohamed, Adel M. A.; Alateyah, Abdulrahman I.; Hasan, Hosam; Matli, Penchal Reddy; El-Sayed Seleman, Mohamed M.; Ahmed, Essam et al.
Object Type:
Article
System:
The UNT Digital Library
Symmetry breaking charge transfer leading to charge separation in a far-red absorbing bisstyryl-BODIPY dimer
Article describes how symmetry breaking charge transfer is one of the important photo-events occurring in photosynthetic reaction centers that is responsible for initiating electron transfer leading to a long-lived charge-separated state and has been successfully employed in light-to-electricity converting optoelectronic devices. In this study, the authors report a newly synthesized, far-red absorbing and emitting BODIPY-dimer to undergo symmetry-breaking charge transfer leading to charge-separated states of appreciable lifetimes in polar solvents.
Date:
December 15, 2023
Creator:
Yahagh, Aida; Kaswan, Ram R.; Kazemi, Shahrzad; Karr, Paul A. & D'Souza, Francis
Object Type:
Article
System:
The UNT Digital Library
Computational study of the gas-phase reactions of sulfuric acid with OH(ΠJ), O(3PJ), Cl(2P) and O(1D2) radicals
This article is about how rate coefficients for reactions of H2SO4 with OH, O(3P) and Cl radicals over 160–298 K were estimated computationally. The authors propose kOH = 8.5 × 10-14 exp(-50 K/T), kO = 1.1 × 10-12 exp(-5012 K/T) and kCl = 3.1 × 10-9 exp(-3314 K/T) cm3 molecule-1 s−1.
Date:
December 27, 2021
Creator:
Marshall, Paul & Burkholder, James B. (James Bart), 1954-
Object Type:
Article
System:
The UNT Digital Library
Experimental and Modeling Study of Water Time Histories during H2S-N2O Combustion in a Shock Tube
Article describes how, in the present study, the water formation was followed by laser absorption with N2O as an oxidant, instead of O2. Three H2S/N2O mixtures diluted in 98% Ar were studied to cover the following range of equivalence ratios: 0.5, 1.0, and 2.0, over a wide range of temperatures (1580–1940 K) around atmospheric pressure.
Date:
June 7, 2023
Creator:
Cooper, Sean P.; Marshall, Paul; Mathieu, Olivier; Pinzón, Laura T.; Mulvihill, Clayton R. & Glarborg, Peter
Object Type:
Article
System:
The UNT Digital Library
Measurement of the Intramolecular Hydrogen-Shift Rate Coefficient for the CH3SCH2OO Radical Between 314 and 433 K
Article describes how the intramolecular hydrogen-shift rate coefficient of the CH3SCH2O2 (methylthiomethylperoxy, MSP) radical, a product formed in the oxidation of dimethyl sulfide (DMS), was measured using a pulsed laser photolysis flow tube reactor coupled to a high-resolution time-of-flight chemical ionization mass spectrometer that measured the formation of the DMS degradation end product HOOCH2SCHO. Measurements performed over the temperature range of 314–433 K yielded a hydrogen-shift rate coefficient of k1(T) = (2.39 ± 0.7) × 109 exp(−(7278 ± 99)/T) s–1 Arrhenius expression and a value extrapolated to 298 K of 0.06 s–1.
Date:
March 2, 2023
Creator:
Assaf, Emmanuel; Finewax, Zachary; Marshall, Paul; Veres, Patrick R.; Neuman, Andrew & Burkholder, James B. (James Bart), 1954-
Object Type:
Article
System:
The UNT Digital Library
Re-evaluation of rate constants for the reaction N2H4 (+ M) ⇄ NH2 + NH2 (+ M)
Article describes how rate constants for the dissociation/recombination reaction N2H4 (+ M) ⇄ NH2 + NH2 (+ M) are determined by a combination of quantum-chemical calculations and statistical unimolecular rate theory. Implications of the present re-evaluated rate constants for the modeling of high temperature ammonia oxidation kinetics are discussed, showing an only small influence of their precise values on the overall properties of the process.
Date:
October 4, 2023
Creator:
Cobos, Carlos J.; Glarborg, Peter; Marshall, Paul & Troe, Jürgen
Object Type:
Article
System:
The UNT Digital Library
Probing High-Temperature Amine Chemistry: Is the Reaction NH3 + NH2 ⇄ N2H3 + H2 Important?
Article describes how the reaction NH3 + NH2 ⇄ N2H3 + H2 (R1) has been identified as a key step to explain experimental results for pyrolysis and oxidation of ammonia. In the present work, the reaction was studied by ab initio theory and by reinterpretation of experimental data.
Date:
March 14, 2023
Creator:
Marshall, Paul & Glarborg, Peter
Object Type:
Article
System:
The UNT Digital Library
Reactions of hydrazine with the amidogen radical and atomic hydrogen
Article describes how the rate coefficient k1 for NH2 + N2H4 was measured to be (5.4 ± 0.4) × 10−14 cm3 molecule−1 s−1 at 296 K. The authors then describe how a combination of experiment and theory leads to a recommended rate coefficient for hydrogen abstraction of k1 = 6.3 × 10−23 T3.44 exp(+289 K/T) cm3 molecule−1 s−1.
Date:
June 7, 2023
Creator:
Gao, Yide; Alecu, I. M.; Hashemi, Hamid; Glarborg, Peter & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library
Re-examination of the N2O+O reaction
This article is about how the reaction of N20 with O is a key step in consumption of nitrous oxide in thermal processes. In the present work ,the authors re-examined a wide range of experiments relevant for the N2O+O reaction through kinetic modeling, paying attention to the impact of artifacts such as impurities and surface reactions.
Date:
July 27, 2023
Creator:
Glarborg, Peter; Allingham, Johanne S.; Skov, Alexander B.; Hashemi, Hamid & Marshall, Paul
Object Type:
Article
System:
The UNT Digital Library