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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Termolecular chemistry facilitated by radical-radical recombinations and its impact on flame speed predictions
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Structure and Kinetics of Organic Acid Radicals Formed in Reaction with • OH Radicals
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Dynamics of Ion Pairing in Dilute Aqueous HCl Solutions by Spectroscopic Measurements of Hydroxyl Radical Conversion into Dichloride Radical Anions
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How Radical Are ?Radical? Photocatalysts? A Closed-Shell Meisenheimer Complex Is Identified as a Sup
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Taming the Chlorine Radical: Enforcing Steric Control over Chlorine-Radical-Mediated C?H Activation
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Structural basis for non-radical catalysis by TsrM, a radical SAM methylase
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A unified reaction network on the formation of five-membered ringed polycyclic aromatic hydrocarbons (PAHs) and their role in ring expansion processes through radical–radical reactions
Exploiting a chemical microreactor in combination with an isomer-selective product identification through fragment-free photoionization utilizing tunable vacuum ultraviolet (VUV) light in tandem with the detection of the ionized molecules by a high resolution reflection time-of-flight mass spectrometer (Re-TOF-MS), the present investigation reveals molecular mass growth processes to four distinct polycyclic aromatic hydrocarbons carrying two six- and one five-membered ring (C 13 H 10 ): 3H-cyclopenta[a]naphthalene, 1H-cyclopenta[b]naphthalene, 1H-cyclopenta[a]naphthalene, and fluorene in the gas phase. Temperatures of 973 and 1023 K simulating conditions in combustion settings along with circumstellar envelopes of carbon-rich stars and planetary nebulae. These reactions highlight the importance of methyl-substituted aromatic reactants (biphenyl, naphthalene) which can be converted to the methylene (–CH 2 ˙) motive by hydrogen abstraction or photolysis. Upon reaction with acetylene, methylene-substituted aromatics carrying a hydrogen atom at the ortho position of the ring can be then converted to cyclopentadiene-annulated aromatics thus providing a versatile pathway to five-membered ring aromatics at elevated temperatures.
Effect of Impurities on Radical Formation in Gibbsite Radiolysis
The generation and stabilization of gamma radiation-induced hydrogen atoms in gibbsite (Al(OH)3) nanoplates is directly related to the nature of residual ions from synthetic precursors used, whether nitrates or chlorides. The concentration of hydrogen atoms trapped in the interstitial layers of gibbsite is lower and decays faster in comparison to boehmite (AlOOH), which could affect the waste management of these materials.
Gas phase radical-radical chain reactions: Hydrocarbon growth without requiring reactivation.
Abstract not provided.
The role of radical-radical chain-propagating pathways in the phenyl + propargyl reaction.
Abstract not provided.
Radical-radical chain reactions: Low-pressure gas-phase aromatic growth.
Abstract not provided.