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4.875 Aktuelle Fachpublikationen zum Thema temperature

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Dehalogenation of functionalized alkyl halides in water at room temperature

21.10.2014 | Nicholas A. Isley; Matt S. Hageman; Bruce H. Lipshutz, Green Chemistry, 2014

Alkyl bromides and chlorides can be reduced to the corresponding hydrocarbons utilizing zinc in the presence of an amine additive. The process takes place in water at ambient temperatures, enabled by a commercially available designer surfactant. The reaction medium can be readily recycled, and ...

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Living Supramolecular Compounds: Influence of Multiple Hydrogen Bond Connection on Molecular Configuration of Monophosphate or Pyrophosphate Thiamine with Anions or Coordination Anions

20.10.2014 | Xiao Xi Zhang, Rui Zhang, Qiao Sun, Si Yue Wei, Xue Ting Xu, Ji Xiao Wang, Feng Ying Bai, Yong Heng Xing, Zeitschrift für anorganische und allgemeine Chemie, 2014

Abstract Three supramolecular compounds with monophosphate or pyrophosphate esters of thiamine, namely, [TPPH+·CF3SO3·H2O] (1), [TMPH+·(CdCl4)0.5·2H2O] (2), and [TMPH+·NO3·2.5H2O] (3) (TPP = thiamine pyrophosphate, TMP = thiamine monophosphate) were synthesized in methanol or water systems at ...

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Separation of Peanut Protein by Reverse Micelles: Optimization of the Forward Extraction

18.10.2014 | Xiaoyan Zhao, Jun Chen, Xiangyan Chen, Xianchang Wang, Yifeng Wang, Journal of Food Processing and Preservation, 2014

Abstract Bis(2‐ethylhexyl) sodium sulfosuccinate (AOT) reverse micelles were applied to extract the protein from peanut cake. In this study, the effect of temperature, amounts of peanut cake flour, particle size of peanut cake flour, pH, water content (W0), KCl concentration and time on the ...

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Reaction Kinetics of Carbon Dioxide (CO2) Absorption in Sodium Salts of Taurine and Proline Using a Stopped‐Flow Technique

18.10.2014 | Ahmed Sodiq, Aravind V. Rayer, Akinola A. Olanrewaju, Mohammad R. M. Abu Zahra, International Journal of Chemical Kinetics, 2014

ABSTRACT The pseudo–first‐order reaction rate constants (k0, s−1) for the reaction of carbon dioxide in aqueous solutions of sodium taurate (NaTau) and sodium prolinate (NaPr) were measured using a stopped‐flow technique at a temperature range of 298–313 K. The solutions concentration varied ...

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Fabrication and characterization of novel hyperbranched polyimides with excellent organosolubility, thermal and mechanical properties

18.10.2014 | Wenqiu Chen, Quantao Li, Quanyuan Zhang, Zushun Xu, Xianbao Wang, Changfeng Yi, Journal of Applied Polymer Science, 2014

ABSTRACT A series of amine‐terminated and anhydride‐terminated hyperbranched polyimides (HBPIs) were successfully prepared with various commercial dianhydrides and a novel BB′2‐type aromatic triamine, 2,4,6‐tris[4‐(4‐aminophenoxy)phenyl]pyridine, with a symmetrical triaryl‐substituted ...

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Ceria–Zirconia Solid Solutions (Ce1–xZrxO2−δ, x ≤ 0.2) for Solar Thermochemical Water Splitting: A Thermodynamic Study

17.10.2014 | Yong Hao; Chih-Kai Yang; Sossina M. Haile, Chemistry of Materials, 2014

The redox behavior of ceria–zirconia solid solutions (or Zr-substituted ceria, ZSC) with a Zr content of up to 20 mol % is studied by thermogravimetry (TG) between 600 °C and 1490 °C under controlled atmospheres. Thermodynamic properties, specifically standard oxidation enthalpy, ΔHoxd⊖, and ...

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Soil Temperature Determines the Reaction of Olive Cultivars to Verticillium dahliae Pathotypes

17.10.2014 | Rocío Calderón et al., PLoS ONE, 2014

by Rocío Calderón, Carlos Lucena, José L. Trapero-Casas, Pablo J. Zarco-Tejada, Juan A. Navas-Cortés Background Development of Verticillium wilt in olive, caused by the soil-borne fungus Verticillium dahliae, can be influenced by biotic and environmental factors. In this study we modeled i) the ...

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Deep-Sea Field Test of the CH4 Hydrate to CO2 Hydrate Spontaneous Conversion Hypothesis

17.10.2014 | Peter G. Brewer; Edward T. Peltzer; Peter M. Walz; Elizabeth K. Coward; Laura A. Stern; Stephen H. Kirby; John Pinkston, Energy & Fuels, 2014

We have carried out a small-scale deep-sea field test of the hypothesis that CH4 gas can be spontaneously produced from CH4 hydrate by injection of a CO2/N2 gas mixture, thereby inducing release of the encaged molecules with sequestration of the injected gas. Pressure cell studies have shown ...

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A Palladium Nanoparticle–Nanomicelle Combination for the Stereoselective Semihydrogenation of Alkynes in Water at Room Temperature

16.10.2014 | Eric D. Slack, Christopher M. Gabriel, Bruce H. Lipshutz, Angewandte Chemie International Edition, 2014

Abstract The addition of NaBH4 to Pd(OAc)2 in water containing nanomicelles leads to the generation of H2 and Pd nanoparticles. Subsequent reduction of disubstituted alkynes affords Z‐alkenes in high yields. These reactions are general, take place in water at ambient temperatures, and offer ...

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A Palladium Nanoparticle–Nanomicelle Combination for the Stereoselective Semihydrogenation of Alkynes in Water at Room Temperature

16.10.2014 | Eric D. Slack, Christopher M. Gabriel, Bruce H. Lipshutz, Angewandte Chemie, 2014

Abstract The addition of NaBH4 to Pd(OAc)2 in water containing nanomicelles leads to the generation of H2 and Pd nanoparticles. Subsequent reduction of disubstituted alkynes affords Z‐alkenes in high yields. These reactions are general, take place in water at ambient temperatures, and offer ...

mehr

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