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正明 山谷 - One of the best experts on this subject based on the ideXlab platform.
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radiation polymerizable Functional Group containing preparation and the radiation polymerizable Functional Group containing organosilyl amine organosilyl amine
2008Co-Authors: 和弘 土田, 正明 山谷Abstract:A method of producing an organosilylamine containing a radiation-polymerizable Functional Group that is useful as a surface treatment agent is provided. The method includes reacting an organosilylamine containing a haloalkyl Group, and at least one salt having a radiation-polymerizable Functional Group selected from the Group consisting of alkali metal salts of organic acids having a radiation-polymerizable Functional Group and alkaline earth metal salts of organic acids having a radiation-polymerizable Functional Group, at a temperature within a range from 50 to 150°C. An organosilylamine containing a radiation-polymerizable Functional Group composed of a specific silazane unit is also provided.
N. Marchand - One of the best experts on this subject based on the ideXlab platform.
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Functional Group composition of organic aerosol from combustion emissions and secondary processes at two contrasted urban environments
Atmospheric environment, 2013Co-Authors: I. El Haddad, N. Marchand, B. D'anna, J. L. Jaffrezo, Henri WorthamAbstract:The quantification of major Functional Groups in atmospheric organic aerosol (OA) provides a constraint on the types of compounds emitted and formed in atmospheric conditions. This paper presents Functional Group composition of organic aerosol from two contrasted urban environments: Marseille during summer and Grenoble during winter. Functional Groups were determined using a tandem mass spectrometry approach, enabling the quantification of carboxylic (RCOOH), carbonyl (RCOR'), and nitro (RNO2) Functional Groups. Using a multiple regression analysis, absolute concentrations of Functional Groups were combined with those of organic carbon derived from different sources in order to infer the Functional Group contents of different organic aerosol fractions. These fractions include fossil fuel combustion emissions, biomass burning emissions and secondary organic aerosol (SOA). Results clearly highlight the differences between Functional Group fingerprints of primary and secondary OA fractions. OA emitted from primary sources is found to be moderately Functionalized, as about 20 carbons per 1000 bear one of the Functional Groups determined here, whereas SOA is much more Functionalized, as in average 94 carbons per 1000 bear a Functional Group under study. Aging processes appear to increase both RCOOH and RCOR' Functional Group contents by nearly one order of magnitude. Conversely, RNO2 content is found to decrease with photochemical processes. Finally, our results also suggest that other Functional Groups significantly contribute to biomass smoke and SOA. In particular, for SOA, the overall oxygen content, assessed using aerosol mass spectrometer measurements by an 0:C ratio of 0.63, is significantly higher than the apparent 0:C* ratio of 0.17 estimated based on Functional Groups measured here. A thorough examination of our data suggests that this remaining unexplained oxygen content can be most probably assigned to alcohol (ROH), organic peroxides (ROOH), organonitrates (RONO2) and/or organosulfates (ROSO3H). (C) 2013 Elsevier Ltd. All rights reserved.
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Functional Group composition of ambient and source organic aerosols determined by tandem mass spectrometry
Atmospheric Chemistry and Physics, 2010Co-Authors: J. Dron, I. El Haddad, J. L. Jaffrezo, Henri Wortham, B. Temime-roussel, N. MarchandAbstract:The Functional Group composition of various organic aerosols (OA) is investigated using a recently developed analytical approach based on atmospheric pressure chemical ionisation-tandem mass spectrometry (APCI-MS/MS). The determinations of three Functional Groups contents are performed quantitatively by neutral loss (carboxylic and carbonyl Groups, R-COOH and R-CO-R' respectively) and precursor ion (nitro Groups, R-NO2) scanning modes of a tandem mass spectrometer. Major organic aerosol sources are studied: vehicular emission and wood combustion for primary aerosol sources; and a secondary organic aerosol (SOA) produced through photooxidation of o-xylene. The results reveal significant differences in the Functional Group contents of these source aerosols. The laboratory generated SOA is dominated by carbonyls while carboxylics are preponderate in the wood combustion particles. On the other hand, vehicular emissions are characterised by a strong nitro content. The total amount of the three Functional Groups accounts for 1.7% (vehicular) to 13.5% (o-xylene photooxidation) of the organic carbon. Diagnostic Functional Group ratios are then used to tentatively discriminate sources of particles collected in an urban background environment located in an Alpine valley (Chamonix, France) during a strong winter pollution event. The three Functional Groups under study account for a total Functionalisation rate of 2.2 to 3.8% of the organic carbon in this ambient aerosol, which is also dominated by carboxylic moieties. In this particular case study of a deep alpine valley during winter, we show that the nitro- and carbonyl-to-carboxylic diagnostic ratios can be a useful tool to discriminate sources. In these conditions, the total OA concentrations are highly dominated by wood combustion OA. This result is confirmed by an organic markers source apportionment approach which assess a wood burning organic carbon contribution of about 60%. Finally, examples of Functional Group mass spectra of all aerosols under study are presented, and additional perspectives offered by the mass spectra in terms of OA characterisation are discussed.
Steven T Diver - One of the best experts on this subject based on the ideXlab platform.
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Functional Group scope in the methylene free tandem enyne metathesis
Organic Letters, 2006Co-Authors: Brian P Peppers, Amol A Kulkarni, Steven T DiverAbstract:The methylene-free ring synthesis of 1,3-cyclohexadienes has been expanded to include a diverse set of Functional Group-rich terminal and internal alkynes.
Stephen E Rankin - One of the best experts on this subject based on the ideXlab platform.
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fluorocarbon and hydrocarbon Functional Group incorporation into nanoporous silica employing fluorinated and hydrocarbon surfactants as templates
Microporous and Mesoporous Materials, 2010Co-Authors: Gifty Oseiprempeh, Hans-joachim Lehmler, Annefrances Miller, Barbara L Knutson, Stephen E RankinAbstract:Abstract Ordered mesoporous hydrocarbon Functionalized ( n -decyl) silica samples are synthesized by the ‘one-pot’ (direct) synthesis method using two cationic fluorinated surfactants, C 6 F 13 C 2 H 2 NC 5 H 5 Cl (HFOPC) and C 8 F 17 C 2 H 2 NC 5 H 5 Cl (HFDePC), and a typical hydrocarbon surfactant, C 16 H 33 N(CH 3 ) 3 Br (CTAB), as templates. The properties of the materials are compared to those of silica samples Functionalized with a fluorocarbon Functional Group, heptadecafluoro-1,1,2,2-tetrahydro-decyl, whose fluorocarbon separating ability was reported earlier [33] . The pore characteristics, organic loading, and wetting properties of the resulting materials are determined for the following combinations of surfactant/Functional Groups: hydrocarbon/hydrocarbon, hydrocarbon/fluorocarbon, fluorocarbon/hydrocarbon and fluorocarbon/fluorocarbon. Synthesis using the longer chain fluoro-surfactant (HFDePC) template results in the highest incorporation of both n -decyl and fluorocarbon Functional Groups, with a corresponding loss of long-range pore order in the fluorinated material. Materials synthesized using the HFOPC template have very low levels of Functional Group incorporation compared to the HFDePC-templated materials. CTAB-templated materials display greater long-range pore order than the fluorocarbon templated materials. The incorporation of the fluorocarbon Functional precursor is more effective (on a % yield basis) than the hydrocarbon Functional precursor for silica materials synthesized using CTAB. Similarly, the use of fluorinated surfactant templates enhances fluorocarbon incorporation relative to hydrocarbon incorporation in the mesoporous material. Solubility of the precursors ( n -decyltriethoxysilane and heptadecafluoro-1,1,2,2-tetrahydro-decyltriethoxysilane) in the synthesis medium and favorable aggregation behavior of the alkane/fluoroalkane Functional Groups with the surfactant micelles improves the incorporation of the Functional Group.
和弘 土田 - One of the best experts on this subject based on the ideXlab platform.
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radiation polymerizable Functional Group containing preparation and the radiation polymerizable Functional Group containing organosilyl amine organosilyl amine
2008Co-Authors: 和弘 土田, 正明 山谷Abstract:A method of producing an organosilylamine containing a radiation-polymerizable Functional Group that is useful as a surface treatment agent is provided. The method includes reacting an organosilylamine containing a haloalkyl Group, and at least one salt having a radiation-polymerizable Functional Group selected from the Group consisting of alkali metal salts of organic acids having a radiation-polymerizable Functional Group and alkaline earth metal salts of organic acids having a radiation-polymerizable Functional Group, at a temperature within a range from 50 to 150°C. An organosilylamine containing a radiation-polymerizable Functional Group composed of a specific silazane unit is also provided.
