Bibliografias temáticas / Oxidising agents

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Literatura científica selecionada sobre o tema "Oxidising agents"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 7 de setembro de 2023

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Artigos de revistas sobre o assunto "Oxidising agents"

Reyes Calle, Juliana, Jairo Antonio Cubillos Lobo, Consuelo Montes de Correa e Aída Luz Villa Holguín de P. "Oxidising agent and catalyst chirality effect on epoxidation of R-(+)- Limonene using Jacobsen-type catalysts". Ingeniería e Investigación 28, n.º 2 (1 de maio de 2008): 37–44. http://dx.doi.org/10.15446/ing.investig.v28n2.14890.

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The oxidising agent effect on R-(+)-Limonene epoxide diastereoselectivity using chiral and achiral Jacobsen’s type catalysts is presented. The type of oxidising agent strongly influences diastereoselectivity. Moderate diastereomeric excesses were achieved in the presence of oxidising agents prepared in situ but in the absence of catalyst (23% for DMD and 29% for O2/pivalaldehyde). Similar diastereomeric excesses were obtained with both chiral and achiral catalyst when the oxidising agents were prepared in situ; 56% and 50% excesses were obtained when using DMD for the chiral and achiral catalyst (respectively) and 38% using O2/pivalaldehyde for both catalysts. Diastereomeric excesses were not observed in the absence of catalyst when using commercial oxidising agents; the chiral catalyst presented larger diastereomeric excesses than its achiral counterpart: 65% and 38% excess using NaOCl for the chiral and achiral catalyst, respectively, and 79% and 39% using m-CPBA for the chiral and achiral catalyst, respectively. This suggests that at least one oxidant species, different from the conventionally accepted (MnV(oxo)), might be involved in this catalytic process. A modification of the traditional catalytic cycle is proposed considering the type of oxidising agent. The catalyst’s chiral centre appears to govern asymmetric induction when commercial oxidising agents are used, whereas the R-(+)-Limonene chiral centre appears to govern asymmetric induction in the presence of in situ-prepared oxidising agents. On the other hand, the chemical stability of Jacobsen’s catalyst improved when in situ produced DMD was used as oxidising agent.

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Jaglic, Z., D. Červinková, H. Vlková, E. Michu, G. Kunová e V. Babák. "Bacterial biofilms resist oxidising agents due to the presence of organic matter". Czech Journal of Food Sciences 30, No. 2 (9 de março de 2012): 178–87. http://dx.doi.org/10.17221/214/2011-cjfs.

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This study evaluated the susceptibility of planktonic and biofilm cells of Staphylococcus spp. (n = 87), Klebsiella spp. (n = 30), and Escherichia coli (n = 74) isolates originating from food contact surfaces of milk and meat processing plants to benzalkonium chloride (BAC), sodium hypochlorite (NaClO), chloramine B (CAB), and peracetic acid (PAA). Bacterial growth and reduction of viable cells in the presence of disinfectants were determined in tryptone soya broth (TSB) and water, respectively. Biofilm positive isolates (n = 73) were tested for the presence of selected qac genes. Unlike BAC, chlorine‑based disinfectants and PAA were poorly efficient in TSB, especially in the case of biofilms. However, when tested in water, the efficacy of NaClO, CAB and PAA substantially increased, which was particularly evident in biofilms. In water, staphylococcal biofilms were even more susceptible to CAB than planktonic cells. A part (23.3%) of the biofilm positive staphylococci carried the qac genes but did not express an increased resistance to BAC. This study showed that bacterial biofilms protected with organic matter could be one of the main reasons for disinfection failure.  

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Cassagne, Thierry, Henri-Jean Cristau, Gérard Delmas, Michel Desgranges, Claude Lion, Gilbert Magnaud, Έliane Torreilles e David Virieux. "Comparative Evaluation of Oxidising and Nucleophilic Properties of Some α-Nucleophiles". Journal of Chemical Research 2002, n.º 7 (julho de 2002): 336–38. http://dx.doi.org/10.3184/030823402103172194.

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Six α-nucleophiles were evaluated at pH = 8 in an aqueous methanolic solution for their oxidising power towards tetrahydrothiophene, and the nucleophilic properties towards paraoxon. MMPP and m-CPBA are the most versatile reagents and can act as nucleophiles as well as oxidising agents.

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Dietmann, Karen Maria, Tobias Linke, Miguel del Nogal Sánchez, José Luis Pérez Pavón e Vicente Rives. "Layered Double Hydroxides with Intercalated Permanganate and Peroxydisulphate Anions for Oxidative Removal of Chlorinated Organic Solvents Contaminated Water". Minerals 10, n.º 5 (20 de maio de 2020): 462. http://dx.doi.org/10.3390/min10050462.

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The contamination by chlorinated organic solvents is a worldwide problem as they can deeply penetrate aquifers, accumulating in the sub-surface as lenses of highly hazardous pollutants. In recent years, so called in situ oxidation processes have been developed to remediate chlorinated organic solvents from groundwater and soil by injecting solutions of oxidising agents such as permanganate or peroxydisulphate. We here present modified layered double hydroxides (LDHs) with intercalated oxidising agents that might serve as new reactants for these remediation strategies. LDHs might serve as support and stabiliser materials for selected oxidising agents during injection, as the uncontrolled reaction and consumption might be inhibited, and guarantee that the selected oxidants persist in the subsurface after injection. In this study, LDHs with hydrotalcite- and hydrocalumite-like structures intercalated with permanganate and peroxydisulphate anions were synthesised and their efficiency was tested in batch experiments using trichloroethene or 1,1,2-trichloroethane as the target contaminants. All samples were characterised using powder X-ray diffraction, thermal analysis coupled with mass spectrometry to directly analyse evolving gases, and Fourier-transform infrared spectroscopy. Additionally, particle size distribution measurements were carried out on the synthesised materials. Results of the batch experiments confirmed the hypothesis that oxidising agents keep their properties after intercalation. Permanganate intercalated LDHs proved to be most efficient at degrading trichloroethene while peroxydisulphate intercalated Ca,Al-LDHs were the most promising studied reactants degrading 1,1,2-trichloroethane. The detection of dichloroethene as well as the transformation of the studied reactants into new LDH phases confirmed the successful degradation of the target contaminant by oxidation processes generated from the intercalated oxidising agent.

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Pečivová, Pavlína, Vladimír Pavlínek, Jan Hrabě e Stanislav Kráčmar. "The influence of reducing and oxidising agents on the rheology of wheat flour dough". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 56, n.º 5 (2008): 163–70. http://dx.doi.org/10.11118/actaun200856050163.

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The effects of a reducing agent (L-cysteine hydrochloride monohydrate), oxidising agents (inactivated dry yeast, L-tyrosine) and other two amino acids (L-threonine and L-tryptophan) on the rheological characteristics of wheat flour dough and its quality were studied. The addition of oxidising agents increases the values such as tenacity and decreases extensibility which were measured on the alveograph. From the consistograph values, weakening of the dough also decreases. While reducing agents increase the extensibility and weakening of the dough, they decrease its deformation energy. The addition of L-tryptophan caused a higher increase in tenacity of the dough but on the other hand a larger decrease in extensibility and deformation energy. L-tryptophan caused better stability of the dough. L-treonine was found to be an oxidising agent. The dough with L-threonine weakened rapidly and therefore fast preparation of the dough is necessary. It means that the time of mixing and dough proofing must be reduced.

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Moore, Harold. "The Action of Some Oxidising: Agents on Cellulose." Journal of the Society of Dyers and Colourists 31, n.º 9 (22 de outubro de 2008): 180–83. http://dx.doi.org/10.1111/j.1478-4408.1915.tb00893.x.

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Schorpp, Marcel, Stephan Rein, Stefan Weber, Harald Scherer e Ingo Krossing. "Guilty and charged: a stable solution of the hexamethylbenzene radical cation as a ligand forming oxidising agent". Chemical Communications 54, n.º 72 (2018): 10036–39. http://dx.doi.org/10.1039/c8cc04690e.

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Caldeo, Veronica, John A. Hannon, Dara-Kate Hickey, Dave Waldron, Martin G. Wilkinson, Thomas P. Beresford e Paul L. H. McSweeney. "Control of oxidation-reduction potential during Cheddar cheese ripening and its effect on the production of volatile flavour compounds". Journal of Dairy Research 83, n.º 4 (3 de outubro de 2016): 479–86. http://dx.doi.org/10.1017/s002202991600056x.

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In cheese, a negative oxidation-reduction (redox) potential is required for the stability of aroma, especially that associated with volatile sulphur compounds. To control the redox potential during ripening, redox agents were added to the salted curd of Cheddar cheese before pressing. The control cheese contained only salt, while different oxidising or reducing agents were added with the NaCl to the experimental cheeses. KIO3 (at 0·05, 0·1 and 1%, w/w) was used as the oxidising agent while cysteine (at 2%, w/w) and Na2S2O4 (at 0·05 and 0·1%, w/w) were used as reducing agents. During ripening the redox potential of the cheeses made with the reducing agents did not differ significantly from the control cheese (Eh ≈ −120 mV) while the cheeses made with 0·1 and 0·05% KIO3 had a significantly higher and positive redox potential in the first month of ripening. Cheese made with 1% KIO3 had positive values of redox potential throughout ripening but no starter lactic acid bacteria survived in this cheese; however, numbers of starter organisms in all other cheeses were similar. Principal component analysis (PCA) of the volatile compounds clearly separated the cheeses made with the reducing agents from cheeses made with the oxidising agents at 2 month of ripening. Cheeses with reducing agents were characterized by the presence of sulphur compounds whereas cheeses made with KIO3 were characterized mainly by aldehydes. At 6 month of ripening, separation by PCA was less evident. These findings support the hypothesis that redox potential could be controlled during ripening and that this parameter has an influence on the development of cheese flavour.

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Carniato, F., C. Bisio, C. Evangelisti, R. Psaro, V. Dal Santo, D. Costenaro, L. Marchese e M. Guidotti. "Iron-montmorillonite clays as active sorbents for the decontamination of hazardous chemical warfare agents". Dalton Transactions 47, n.º 9 (2018): 2939–48. http://dx.doi.org/10.1039/c7dt03859c.

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Montmorillonite clay was modified to introduce iron species and acid sites in the interlayer space, aiming to obtain a catalyst with oxidising and acid properties for the degradation of chemical warfare agents.

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Viseux, Eddy, Rhys Ellis, Kee-Han Lee, Matthew Ainsworth e Alexander Kerr. "Development of Manganese(VI) Oxidising Agents Soluble in Organic Solvents". Synlett 23, n.º 09 (14 de maio de 2012): 1371–73. http://dx.doi.org/10.1055/s-0031-1290691.

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Mais fontes

Teses / dissertações sobre o assunto "Oxidising agents"

RaviJayaKumar, K., University of Western Sydney e Faculty of Science and Technology. "Selective oxidation of adamantane by metal complexes". THESIS_FST_XXX_RaviJayaKumar_ K.xml, 1997. http://handle.uws.edu.au:8081/1959.7/369.

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A series of tri-substituted iron and cobalt complexes of the form [M(A)3]n+ were synthesized, and were characterised by UV/Visible absorption and 1H-NMR spectroscopy. The complexes [Co(phen)2(en)]3+ and [Co(bipy)2(en)]3+ have been reported in the literature but 1H-NMR spectroscopy showed that the material produced in both syntheses is [Co(en)3]3+. Spectroscopy further showed that these species cannot be prepared by the literature methods. The complexes were tested in the oxidation of adamantane in the solvents, acetic acid and trifluoroacetic acid and they all oxidised adamantane to a mixture of 1-adamantanol, 1-adamantanol and 2-adamantanone both in the presence and the absence of the oxidant, O2. In all the reactions, however, the yield of conversion was very low. The mechanism for this oxidation was different depending on the presence or absence of O2. In the presence of O2 a catalytic cycle was produced for the oxidation of adamantine. In the oxidation in the presence and absence of O2 there was little variation in activity between the tri-substituted iron and cobalt complexes of 1,10-phenanthroline when compared with the analgous 2,2’-bipyridine complexes. However, the substitution of an ethylenediamine ligand into the co-ordination sphere of cobalt produced significant increase in the activity, although the change was not constant.
Master of Science (Hons)

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Haidu, Francisc. "Tailoring the Electronic and Optical Properties of Molecular Thin Films by Reducing and Oxidising Agents". Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159012.

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Heutzutage wächst die Nachfrage nach neuartigen Geräten, die teilweise (hybrid) oder völlig aus organischen halbleitenden Materialien hergestellt sind. Der Grund dafür sind die geringen Herstellungskosten sowie die hohe Flexibilität im Moleküldesign und damit einstellbare optische, elektronische und Spintronik-Eigenschaften. Bisher sind mit großem Erfolg organische Leuchtdioden (OLED), organische Solarzellen und gedruckte organische Elektronik-Bauelemente hergestellt worden. Auf Grund ihrer langen Spin-Lebensdauer sind Moleküle auch für Spintronik-Anwendungen sehr geeignet. In dieser Arbeit wurden die elektronischen und optischen Eigenschaften von vier ausgewählten Molekülen analysiert. Davon wurden Kupfer- und Mangan-Phthalocyanin (CuPc und MnPc) für die Untersuchung der Anordnung des Energieniveaus an der Metall-Organischen Halbleitern (M-O) Grenzfläche verwendet. Außerdem werden die andere zwei Moleküle tris(8-hydroxy-quinolinato) Aluminium(III) (Alq3) und N,N’-diphenyl-N,N’-bis(1-naphthyl)-1,1’-biphenyl-4,4’-diamine (α-NPD) häufig in OLED-Strukturen als Elektron- beziehungsweise Loch-Leiter verwendet. Die Proben sind mittels organischer Molekularstrahl-Abscheidung (OMBD) auf Co (oder Au) Folien beziehungsweise auf einseitig poliertem Si(111) Einkristall hergestellt worden. Im ersten Teil der Arbeit wurde die Entwicklung der Grenzfläche zwischen CuPc und Co (oder Au) Substrat mittels Valenzband- und Inverser Photoelektronen-spektroskopie (VB-PES und IPES) analysiert und herausgefunden, dass ein „Öffnung“ der Bandlücke mit dem Wachstum der Molekularschicht erfolgt. Ähnliches findet bei die MnPc/Co-Grenzfläche statt. Diese Erkenntnisse sind sehr wichtig für die Entwicklung von zukünftigen leistungsfähigen Spintronik Geräten. Der zweite Teil fokussiert auf die Änderungen der elektronischen Eigenschaften von MnPc und Alq3 während der Oxidation (O2-Aussetzung) beziehungsweise Reduktion (Kalium-Abscheidung). Abgesehen von den VB-PES und IPES Messungen, bieten die Röntgenphotoelektronenspektroskopie (XPS) und die Röntgen-Nahkante- Absorptions-Spektroskopie (NEXAFS) wichtige Informationen w. z. B. die Menge von K in der Molekülschicht und den Spin-Zustand im undotierten und im dotierten MnPc. Der dritte Teil beschäftigt sich mit den optischen Eigenschaften von MnPc, Alq3 und α-NPD als Reinmaterialien sowie mit K-dotierten Molekülen, in situ verfolgt mittels spektroskopischer Ellipsometrie (SE). Vom SE-Spektrum wurde der Imaginärteil der dielektrischen Funktion abgeleitet. Während α-NPD fast keine Änderung im Absorptionsspektrum nach der Dotierung zeigt, zeigt Alq3 dagegen ein Wandel zu einer dotierten Phase mit kleine Änderungen im Spektrum. Dabei hat MnPc drei stabile dotierte Phasen mit großen spektralen Änderungen. Außerdem zeigt die Oxidation von MnPc umgekehrt Eigenschaften zur dotierten Phase. Alle diese Messungen sind einzigartig und sehr wichtig für die Entwicklung von OLED und Spintronik Geräten.

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Rogg, Simone Erika [Verfasser], Christian [Akademischer Betreuer] Hess e Bastian [Akademischer Betreuer] Etzold. "Development and Application of Operando Spectroscopy for Vanadium Oxide Catalysts in ODH Reactions: A Comparison of O2 and CO2 as Oxidising Agents / Simone Erika Rogg ; Christian Hess, Bastian J. M. Etzold". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://nbn-resolving.de/urn:nbn:de:tuda-tuprints-118917.

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Rogg, Simone Erika [Verfasser], Christian [Akademischer Betreuer] Hess e Bastian J. M. [Akademischer Betreuer] Etzold. "Development and Application of Operando Spectroscopy for Vanadium Oxide Catalysts in ODH Reactions: A Comparison of O2 and CO2 as Oxidising Agents / Simone Erika Rogg ; Christian Hess, Bastian J. M. Etzold". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/121390790X/34.

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Haidu, Francisc [Verfasser], Dietrich R. T. [Akademischer Betreuer] Zahn, Dietrich R. T. [Gutachter] Zahn, Ovidiu D. [Akademischer Betreuer] Gordan, Daniel [Akademischer Betreuer] Lehmann e Martin [Gutachter] Knupfer. "Tailoring the Electronic and Optical Properties of Molecular Thin Films by Reducing and Oxidising Agents / Francisc Haidu ; Gutachter: Dietrich R. T. Zahn, Martin Knupfer ; Dietrich R. T. Zahn, Ovidiu D. Gordan, Daniel Lehmann". Chemnitz : Universitätsbibliothek Chemnitz, 2015. http://d-nb.info/1214303242/34.

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Damm, Jochen H. "Transport of the oxidising agent permanganate in the subsurface and the investigation of its potential to degrade methyl tert-butyl ether in-situ". Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273080.

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Haidu, Francisc. "Tailoring the Electronic and Optical Properties of Molecular Thin Films by Reducing and Oxidising Agents". Doctoral thesis, 2014. https://monarch.qucosa.de/id/qucosa%3A20176.

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RaviJayaKumar, K. "Selective oxidation of adamantane by metal complexes". Thesis, 1997. http://handle.uws.edu.au:8081/1959.7/369.

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Eager, Kevin Richard. "The actions of thiol specific oxidising agents on single channel activity of the ryanodine receptor calcium release channel in cardiac muscle". Phd thesis, 1997. http://hdl.handle.net/1885/145908.

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Prasad, M. Rajendra. "Studies On Multiphase And Multienzymatic Oxidation Of Glucose". Thesis, 1996. https://etd.iisc.ac.in/handle/2005/1866.

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Livros sobre o assunto "Oxidising agents"

Chotalia, Minaxi. The reaction of cobalt metal powder with novel oxidising agents. Manchester: UMIST, 1999.

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Mustafa, Chand Mohammad. Corrosion inhibition of mild steel by molybdate in the presence of organic compounds and oxidising agents. Birmingham: University of Birmingham, 1990.

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Sherwood, Dennis, e Paul Dalby. Electrochemistry. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198782957.003.0020.

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This chapter explores electrochemistry, from the fundamental observations associated with the Daniel Cell to redox reactions and the Nernst equation. As throughout the book, all the discussions are based on rigorous first principles, with each step carefully explained, and deduced logically from previous material. Topics covered include electrodes and electrode potentials, half-cells and half-cell reactions, electrochemical cells, the electromotive force, standard reversible electrode potentials, oxidising and reducing agents, redox reactions, and the half-cell Nernst equation, and the full reaction Nernst equation.

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Capítulos de livros sobre o assunto "Oxidising agents"

Petrouleas, Vasili, Josephine Sarrou, Gert Schansker e Nikolaos Ioannidis. "Probing the Lower States of the Water-Oxidising Complex of Photosystem II by the Use of No as a Redox Agent". In Photosynthesis: Mechanisms and Effects, 1241–46. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-3953-3_295.

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Relatórios de organizações sobre o assunto "Oxidising agents"

Kudin, Roman, Prabhat Chand e Anura Bakmeedeniya. Mitigating Nitrogen Oxides Exhaust Emissions from Petrol Vehicles by Application of a Fuel Additive. Unitec ePress, agosto de 2020. http://dx.doi.org/10.34074/rsrp.083.

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This research has been commissioned by Eco Fuel Global Limited, a New Zealand-based company, to further evaluate the effects of their fuel-additive product on the tailpipe exhaust emissions of petrol cars. At the time this research was conducted (end of 2018), the product was still in development and had not been released to the market. Prior to the testing in this research, an initial pilot test was done for the same product on a single car (Nissan Pulsar 1998), which showed favourable results, with a reduction in hydrocarbons and oxides of nitrogen at the tailpipe by more than 70%. The current research included five test cars, all running on RON 95 fuel, with the years of manufacture ranging between 1994 and 2006, and the odometer readings between 112,004 km and 264,001 km. The effects of the fuel-additive product were assessed by comparing the emissions from a car running on standard fuel with the emissions from the same car after it completed a road run (250±20 km) on the additive-treated fuel. The exhaust emissions were measured using the AVL series 4000 Emission Tester, which analyses five components: carbon monoxide (CO), carbon dioxide (CO2), oxides of nitrogen (NOX), hydrocarbons (HC) and oxygen (O2). The most noticeable outcome of using the fuel-additive product was the reduction in the concentration of oxides of nitrogen in the tailpipe exhaust (by up to 27.7%), when compared with the same cars running on standard fuel. In addition, the results showed a decrease in residual oxygen concentration, which normally indicates more complete utilisation of O2 as an oxidising agent. Mitigating Nitrogen Oxides Exhaust Emissions from Petrol Vehicles by Application of a Fuel Additive Dr Roman Kudin, Prabhat Chand and Anura Bakmeedeniya 2 The changes for other emission parameters were either relatively small (below 1%) or were not statistically significant. The application of such fuel-additive products could be beneficial for mitigating nitrogen oxides exhaust emissions from petrol vehicles in countries with ageing car fleets. These include New Zealand, which has a relatively high proportion of old cars in use, with no government-run scrappage scheme, and without a mandatory objective emissions testing.

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