Thomas Nauser
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View article: Photochemical Methods to Study the Radical-Induced Degradation of Anion-Exchange Membranes
Photochemical Methods to Study the Radical-Induced Degradation of Anion-Exchange Membranes Open
We adapted two photochemical methods to generate radicals and assess their impact on anion exchange membrane stability, independent of base-induced degradation. Through the exposure of aqueous solutions of potassium nitrite or suspensions …
View article: Inexpensive Methods to Study the Radical Induced Degradation of Anion-Exchange Membranes
Inexpensive Methods to Study the Radical Induced Degradation of Anion-Exchange Membranes Open
We adapted two photochemical methods to generate radicals and assess their impact on anion exchange membrane stability, independent of base-induced degradation. By exposure of aqueous solutions of potassium nitrite or suspensions of TiO₂ t…
View article: In Vitro Fossilization for High Spatial Resolution Quantification of Elements in Plant-Tissue Using LA-ICP-TOFMS
In Vitro Fossilization for High Spatial Resolution Quantification of Elements in Plant-Tissue Using LA-ICP-TOFMS Open
Laser ablation in combination with an inductively coupled plasma time-of-flight mass spectrometer (LA-ICP-TOFMS) is an upcoming method for rapid quantitative element mapping of various samples. While widespread in geological applications, …
View article: Front Cover: A Nature‐Inspired Antioxidant Strategy based on Porphyrin for Aromatic Hydrocarbon Containing Fuel Cell Membranes (ChemSusChem 21/2023)
Front Cover: A Nature‐Inspired Antioxidant Strategy based on Porphyrin for Aromatic Hydrocarbon Containing Fuel Cell Membranes (ChemSusChem 21/2023) Open
The Front Cover shows that during the operation of a proton exchange membrane fuel cell harmful radical species (HO⋅, H⋅ and HOO⋅) form that attack the membrane. The use of hydrocarbon-based proton-conducting membranes in fuel cells is cur…
View article: Radical Attack and Damage Mitigation in Hydrocarbon-Based Ionomers
Radical Attack and Damage Mitigation in Hydrocarbon-Based Ionomers Open
An antioxidant strategy for aromatic hydrocarbon based proton exchange membranes for fuel cells and electrolyzers requires an understanding of the mechanisms of radical attack and follow-up reactions. We provide experimental evidence that …
View article: A Nature‐Inspired Antioxidant Strategy based on Porphyrin for Aromatic Hydrocarbon Containing Fuel Cell Membranes**
A Nature‐Inspired Antioxidant Strategy based on Porphyrin for Aromatic Hydrocarbon Containing Fuel Cell Membranes** Open
The use of hydrocarbon‐based proton conducting membranes in fuel cells is currently hampered by the insufficient durability of the material in the device. Membrane aging is triggered by the presence of reactive intermediates, such as HO⋅, …
View article: CCDC 2207763: Experimental Crystal Structure Determination
CCDC 2207763: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: A Nature-inspired Antioxidant Strategy based on Porphyrin for Aromatic Hydrocarbon Containing Fuel Cell Membranes
A Nature-inspired Antioxidant Strategy based on Porphyrin for Aromatic Hydrocarbon Containing Fuel Cell Membranes Open
The use of hydrocarbon-based proton conducting membranes in fuel cells is currently hampered by the insufficient durability of the material in the device. Membrane aging is triggered by the presence of reactive intermediates, such as HO·, …
View article: Electron‐Driven Nitration of Unsaturated Hydrocarbons
Electron‐Driven Nitration of Unsaturated Hydrocarbons Open
Herein, we introduce an electrochemically assisted generation of nitryl radicals from ferric nitrate under mild reaction conditions using a simple setup with inexpensive graphite and stainless‐steel electrodes. The mechanism of the reactio…
View article: On the Radical‐Induced Degradation of Quaternary Ammonium Cations for Anion‐Exchange Membrane Fuel Cells and Electrolyzers
On the Radical‐Induced Degradation of Quaternary Ammonium Cations for Anion‐Exchange Membrane Fuel Cells and Electrolyzers Open
Four benzylic‐type quaternary ammonium (QA) compounds with different electron density at the phenyl group were evaluated for their susceptibility against degradation by radicals. Time‐resolved absorption spectroscopy indicated that radical…
View article: EPR Study on the Oxidative Degradation of Phenyl Sulfonates, Constituents of Aromatic Hydrocarbon-Based Proton-Exchange Fuel Cell Membranes
EPR Study on the Oxidative Degradation of Phenyl Sulfonates, Constituents of Aromatic Hydrocarbon-Based Proton-Exchange Fuel Cell Membranes Open
Sulfonated aromatic hydrocarbon-based ionomers are potential constituents of next-generation polymer electrolyte fuel cells (PEFCs). Widespread application is currently limited due to their susceptibility to radical-initiated oxidative deg…
View article: Moderation of Oxidative Damage on Aromatic Hydrocarbon-Based Polymers
Moderation of Oxidative Damage on Aromatic Hydrocarbon-Based Polymers Open
During the operation of aromatic hydrocarbon-based proton exchange membrane fuel cells, formed radical species attack the membrane. The most deleterious radical formed is HO · , both strongly electrophilic and oxidising. Oligomers of α -me…
View article: Initiation and Prevention of Biological Damage by Radiation-Generated Protein Radicals
Initiation and Prevention of Biological Damage by Radiation-Generated Protein Radicals Open
Ionizing radiations cause chemical damage to proteins. In aerobic aqueous solutions, the damage is commonly mediated by the hydroxyl free radicals generated from water, resulting in formation of protein radicals. Protein damage is especial…
View article: Impact of substitution on reactions and stability of one-electron oxidised phenyl sulfonates in aqueous solution
Impact of substitution on reactions and stability of one-electron oxidised phenyl sulfonates in aqueous solution Open
Functional groups can be used to modify the equilibrium position and tune the reactivity of one electron oxidised aromatic compounds.
View article: Fast Antioxidant Reaction of Polyphenols and Their Metabolites
Fast Antioxidant Reaction of Polyphenols and Their Metabolites Open
The negative correlation between diets rich in fruits and vegetables and the occurrence of cardiovascular disease, stroke, cancer, atherosclerosis, cognitive impairment and other deleterious conditions is well established, with flavonoids …
View article: Unexpected Disparity in Photoinduced Reactions of C<sub>60</sub> and C<sub>70</sub> in Water with the Generation of O<sub>2</sub><sup>•–</sup> or <sup>1</sup>O<sub>2</sub>
Unexpected Disparity in Photoinduced Reactions of C<sub>60</sub> and C<sub>70</sub> in Water with the Generation of O<sub>2</sub><sup>•–</sup> or <sup>1</sup>O<sub>2</sub> Open
Well-defined fullerene-PEG conjugates, C60-PEG (1) and two C70-PEG (2 and 3 with the addition sites on ab-[6,6] and cc-[6,6]-junctions), were prepared from their corresponding Prato monoadduct precursors. The resulting highly water-soluble…
View article: Possible Repair Mechanism for Hydrocarbon-Based Ionomers Following Damage by Radical Attack
Possible Repair Mechanism for Hydrocarbon-Based Ionomers Following Damage by Radical Attack Open
Polymer electrolyte fuel cell (PEFC) membranes are subject to radical-induced degradation. Antioxidant strategies for hydrocarbon-based ionomers containing aromatic units can focus on intermediates that are formed upon attack by hydroxyl r…
View article: Addition of carbon-centered radicals to aromatic antioxidants: mechanistic aspects
Addition of carbon-centered radicals to aromatic antioxidants: mechanistic aspects Open
Propreties and possible biological implications of the reaction cascade of polyphenols with carbon-centered radicals are described.
View article: Thermochemical unification of molecular descriptors to predict radical hydrogen abstraction with low computational cost
Thermochemical unification of molecular descriptors to predict radical hydrogen abstraction with low computational cost Open
Parametrization of transition-state effects via cheap quantum-chemical descriptors allows fast and accurate prediction of hydrogen abstraction rate constants.
View article: Attack of hydroxyl radicals to α-methyl-styrene sulfonate polymers and cerium-mediated repair <i>via</i> radical cations
Attack of hydroxyl radicals to α-methyl-styrene sulfonate polymers and cerium-mediated repair <i>via</i> radical cations Open
Reaction between OH˙ radicals and α-methylstyrene sulfonate oligomers leads to radical cations which can be reduced by CeIII ions.
View article: Profiling the oxidative activation of DMSO-F<sub>6</sub> by pulse radiolysis and translational potential for radical C–H trifluoromethylation
Profiling the oxidative activation of DMSO-F<sub>6</sub> by pulse radiolysis and translational potential for radical C–H trifluoromethylation Open
The improved synthesis of perfluorinated dimethyl sulfoxide, DMSO-F6, and its activation with hydroxyl radicals to afford trifluoromethyl radicals is presented.
View article: Perspective—Prospects for Durable Hydrocarbon-Based Fuel Cell Membranes
Perspective—Prospects for Durable Hydrocarbon-Based Fuel Cell Membranes Open
Various types of hydrocarbon-based ionomer membranes have been proposed for application in fuel cells as an alternative to perfluoroalkylsulfonic acid (PFSA) membranes. The issue of chemical and mechanical degradation of this class of iono…
View article: Jumpstarting the cytochrome P450 catalytic cycle with a hydrated electron
Jumpstarting the cytochrome P450 catalytic cycle with a hydrated electron Open
Cytochrome P450cam (CYP101Fe3+) regioselectively hydroxylates camphor. Possible hydroxylating intermediates in the catalytic cycle of this well-characterized enzyme have been proposed on the basis of experiments carried out at very low tem…