Results 21 to 30 of about 194,922 (371)
Discovery of Fluorine in Cool Extreme Helium Stars [PDF]
Astrophys.J.648:L143-L146,2006, 2006 Neutral fluorine (F I) lines are identified in the optical spectra of cool EHe stars. These are the first identification of F I lines in a star's spectrum, and provide the first measurement of fluorine abundances in EHe stars. The results show that fluorine is overabundant in EHe stars.
arxiv +1 more source
Fluorination of Uranium Metal by Fluorine Gas [PDF]
Journal of Nuclear Science and Technology, 1972 A study has been made on the fluorination of uranium metal chips to UF6 with fluorine gas in the temperature range of 100° to 400°C. The formation of UF6 was influenced by the concentration and the flow rate of fluorine gas and by the reaction temperature. The reaction occurred apparently above 200°C.
Taneaki Yahata, Matae Iwasaki
openaire +2 more sources
Chemical Reviews, 2018 New methods for preparation of tailor-made fluorine-containing compounds are in extremely high demand in nearly every sector of chemical industry. The asymmetric construction of quaternary C-F stereogenic centers is the most synthetically challenging and,
Yi Zhu +8 more
semanticscholar +1 more source
Pd/SAPO-34 passive NO x adsorbers: Stable Pd ion adsorption sites in six-member rings
Materials Research Express, 2021 Pd/zeolites with chabazite (CHA) topology are effective passive NO _x adsorbers (PNAs), which are promising for the removal of NO _x from diesel exhausts during cold start to meet increasingly stringent emission regulations.
Nana Zhang +7 more
doaj +1 more source
Nature Chemistry, 2010 Herbert Roesky relates how the small, highly electronegative fluorine atom unveiled the chemical reactivity of noble gases and found many practical applications. but it can also render organic compounds highly toxic or pollutants.
openaire +4 more sources
Theoretical insights on designing of difluoramino compounds
FirePhysChem, 2022 In order to screen out novel energetic compounds with excellent comprehensive properties and provide theoretical guidance for design researcher, a series of difluoroamino energetic compounds were designed by combining energetic molecular scaffolds and ...
Peng Lian +5 more
doaj
Nanomaterials, 2023 Exploring non-precious metal-based catalysts for oxygen reduction reactions (ORR) as a substitute for precious metal catalysts has attracted great attention in recent times.
Jun Dong +6 more
doaj +1 more source
Detection of fluorine in hot Extreme Helium Stars [PDF]
, 2020 The main objective of this paper is to explore abundances of fluorine in hot Extreme Helium Stars (EHes). Overabundance of fluorine is a characteristic feature for cool EHes and R Coronae Borealis (RCB) stars and further enforces their close connection. For hot EHes this relationship with the cooler EHes, based on their fluorine abundance is unexplored.
arxiv +1 more source
Tuning Hydrogen Adsorption and Electronic Properties from Graphene to Fluorographone [PDF]
Phys. Rev. Materials 4, 074005 (2020), 2020 Graphene functionalization by hydrogen and fluorine has been proposed as a route to modulate its reactivity and electronic properties. However, until now, proposed systems present degradation and limited hydrogen adsorption capacity. In this study, combining first-principles calculations based on density functional theory (DFT) and reactive molecular ...
arxiv +1 more source
FirePhysChem, 2022 In order to explore novel high-energy and green oxidants, oxygen-rich clusters O4−/0 and O6−/0 were investigated by laser-vaporization source, mass spectrometry and theoretical calculations.
Bin Yang +5 more
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