Chlorine abstraction by laser pyrolysis of W(CO)6; a mild route to gas-phase organic radical chemistry

1998 ◽  
pp. 703-704 ◽  
Author(s):  
Grant R. Allen ◽  
Noel D. Renner
Keyword(s):  
Gas Phase ◽  
Organic Radical ◽  
Laser Pyrolysis ◽  
Radical Chemistry

ChemInform Abstract: Radical Chemistry in the Gas Phase

ChemInform ◽  
2012 ◽  
Vol 43 (37) ◽  
pp. no-no
Author(s):  
Christian Alcaraz ◽  
Ingo Fischer ◽  
Detlef Schroeder
Keyword(s):  
Gas Phase ◽  
Radical Chemistry

Laser pyrolysis of carbon-nitrogen gas-phase compounds: An attempted approach to carbon nitride formation

Carbon ◽  
1998 ◽  
Vol 36 (5-6) ◽  
pp. 795-800 ◽  
Author(s):  
R. Alexandrescu ◽  
S. Cojocaru ◽  
A. Crunteanu ◽  
S. Petcu ◽  
R. Cireasa ◽  
...  
Keyword(s):  
Gas Phase ◽  
Carbon Nitride ◽  
Nitrogen Gas ◽  
Laser Pyrolysis ◽  
Nitride Formation

scholarly journals Photochemistry Aspects of the Laser Pyrolysis Addressing the Preparation of Oxide Semiconductor Photocatalysts

2008 ◽  
Vol 2008 ◽  
pp. 1-11 ◽  
Author(s):  
R. Alexandrescu ◽  
I. Morjan ◽  
F. Dumitrache ◽  
M. Scarisoreanu ◽  
I. Soare ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Gas Phase ◽  
Anatase Phase ◽  
Iron Pentacarbonyl ◽  
Oxide Semiconductor ◽  
Iron Oxide Particles ◽  
Gamma Iron ◽  
Laser Pyrolysis ◽  
Synthesis Of Nanoparticles ◽  
Versatile Tool

The laser pyrolysis is a powerful and a versatile tool for the gas-phase synthesis of nanoparticles. In this paper, some fundamental and applicative characteristics of this technique are outlined and recent results obtained in the preparation of gamma iron oxide (γ-Fe2O3) and titania (TiO2) semiconductor nanostructures are illustrated. Nanosized iron oxide particles (4 to 9 nm diameter values) have been directly synthesized by the laser-induced pyrolysis of a mixture containing iron pentacarbonyl/air (as oxidizer)/ethylene (as sensitizer). Temperature-dependent Mossbauer spectroscopy shows that mainly maghemite is present in the sample obtained at higher laser power. The use of selectedFe2O3samples for the preparation of water-dispersed magnetic nanofluids is also discussed.TiO2nanoparticles comprising a mixture of anatase and rutile phases were synthesized via the laser pyrolysis ofTiCl4- (vapors) based gas-phase mixtures. High precursor concentration of the oxidizer was found to favor the prevalent anatase phase (about 90%) in the titania nanopowders.

scholarly journals Aqueous chemistry and its role in secondary organic aerosol (SOA) formation

2010 ◽  
Vol 10 (21) ◽  
pp. 10521-10539 ◽  
Author(s):  
Y. B. Lim ◽  
Y. Tan ◽  
M. J. Perri ◽  
S. P. Seitzinger ◽  
B. J. Turpin
Keyword(s):  
Organic Acids ◽  
Gas Phase ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Water Soluble ◽  
Base Catalysis ◽  
Radical Reactions ◽  
Oh Radicals ◽  
Aqueous Chemistry ◽  
Radical Chemistry

Abstract. There is a growing understanding that secondary organic aerosol (SOA) can form through reactions in atmospheric waters (i.e., clouds, fogs, and aerosol water). In clouds and wet aerosols, water-soluble organic products of gas-phase photochemistry dissolve into the aqueous phase where they can react further (e.g., with OH radicals) to form low volatility products that are largely retained in the particle phase. Organic acids, oligomers and other products form via radical and non-radical reactions, including hemiacetal formation during droplet evaporation, acid/base catalysis, and reaction of organics with other constituents (e.g., NH4+). This paper provides an overview of SOA formation through aqueous chemistry, including atmospheric evidence for this process and a review of radical and non-radical chemistry, using glyoxal as a model precursor. Previously unreported analyses and new kinetic modeling are reported herein to support the discussion of radical chemistry. Results suggest that reactions with OH radicals tend to be faster and form more SOA than non-radical reactions. In clouds these reactions yield organic acids, whereas in wet aerosols they yield large multifunctional humic-like substances formed via radical-radical reactions and their O/C ratios are near 1.

ChemInform Abstract: The Renaissance of Organic Radical Chemistry - Deja Vu All over Again

ChemInform ◽  
2014 ◽  
Vol 45 (31) ◽  
pp. no-no
Author(s):  
Corey R. J. Stephenson ◽  
Armido Studer ◽  
Dennis P. Curran
Keyword(s):  
Organic Radical ◽  
Radical Chemistry ◽  
Deja Vu ◽  
Déjà Vu

Unusual gas-phase isomers of simple organic radical cations

1983 ◽  
Vol 46 ◽  
pp. 235-238 ◽  
Author(s):  
Willem J. Bouma ◽  
John K. MacLeod ◽  
Ross H. Nobes ◽  
Leo Radom
Keyword(s):  
Gas Phase ◽  
Radical Cations ◽  
Organic Radical
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