Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 45 for “"viologen"”.
-
Design, Synthesis and Characterisation of π-Extended Viologen-Based Molecular and Supramolecular Complexes with Cucurbit[n]urils
Viologens, 4,4'-bipyridinium dications (V$^{2+}$), have attracted much attention as electron mediators in a variety of photochemical, electrochemical and chemical processes ranging from catalysis, electrochromic devices to solar energy conversion and storage systems. % The different applications of …
-
Polypyrrole modified with sulfated β-cyclodextrin: characterization and application in the sensing of viologens
… of three compounds, methyl, ethyl and benzyl viologen. Methyl viologen is commonly known as paraquat and it is one of the most commonly used herbicides worldwide. The sβ-CD was permanently immobilized within the ppy backbone during the potentiostatic growth of the polymer. The incorporation of …
-
Development of novel indicators
… have been developed. The first system is of a viologen salt, preferably benzyl viologen chloride, dissolved in poly(vinyl alcohol). This viologen dosimeter responds clearly to different wavelengths and intensities of UV light, although the colour change is hampered by the presence of oxygen, …
-
Organic macromolecular architectures for non-aqueous redox flow batteries
… Our first example of such a material utilized viologen pendant groups as the redox mediator and acted as the anode material. This approach provided a system with reversible cycling efficiency (94-99%) and selective prevention of crossover (97%). In the attempt to form a full cell, a …
-
An Electrochemical Investigation into the Corrosion Protection Properties of Coatings for the Active Metal Copper
… of multiwalled carbon nanotubes (MWCNT), and viologen films adsorbed at copper. The corrosion protective properties of these films were studied and compared to the uncoated copper substrate. They were assessed and studied using a combination of cyclic voltammetry, polarisation curves, Tafel …
-
Automated small molecule synthesis for accelerated discovery of photo- and electroactive organic materials
… framework was developed for discovery of viologen pairs for transparent-to-black/grey electrochromism. In this way, time-dependent density functional theory (TDDFT) -guided method was used to design new viologen pairs to overcome limitations in using single viologen molecules for broadband …
-
Supramolecular Chemistry at the Polymer-Oil Interface
… some water remains in the polymer layer. A viologen-cucurbit[8]uril binding site was chosen as the supramolecular surface interaction. The binding unit was incorporated into the polyamide-imide. The synthesis of the binding site polymer was achieved in two stages; the reproduction of the …
-
Structural and spectroscopic studies on the porin-cytochrome complex from Shewanella oneidensis MR-1
… into" liposomes" containing" either"methyl" viologen," small" tetra" heme" cytochrome" (STC)" or" cytochrome" c." Using" these" proteoliposomes" the" rate" of" electron"transfer"across"MtrCAB"was"investigated."MtrCAB"was"seen"to"enable"the"reduction" …
-
In-situ monitoring of photocatalytic reactions in optofluidic microreactors
… a cumulative sample volume of < 1.5 mL, using viologen species as indicators of electron transfer from CDs. First, amorphous and graphitic CDs were benchmarked against the well-known photocatalyst [Ru(bpy)3]2+. This study was then extended to replace the viologen indicator with …
-
Responses of Superoxide Dismutases to Oxidative Stress in Arabidopsis thaliana
… oxidative stress, caused by methyl viologen or 3-(3, 4-dichlorphenyl)-1-1′ dimethylurea (DCMU) on SOD populations were investigated. A cloned Arabidopsis thaliana Fe SOD gene was expressed in Escherichia coli and was purified from transformed cells. This protein was used to raise …
-
A biochemical and physiological characterization of coenzyme F420-reducing hydrogenase from Methanobacterium formicicum
… F₄₂₀ dependent activity but not the methyl viologen-dependent activity of the purified enzyme. Cell extract of M. formicicum contained a coenzyme F₄₂₀-mediated formate hydrogenlyase system. Formate hydrogenlyase activity was reconstituted with coenzyme F₄₂₀-reducing hydrogenase, coenzyme …
-
The F(430) cofactor of methyl coenzyme M reductase: Ligand binding to the nickel and chemical modification of the tetrapyrrole substituents
… centers in the different redox states of methyl viologen-reducing hydrogenase from the same bacterium were investigated.
-
Engineered Vesicles for Perchlorate Degradation
… reduction was quantified using a methyl viologen colorimetric technique. The vesicle solutions had perchlorate-reducing activities ranging from 35-45 units per liter. This work shows that vesicles can provide a mechanism to utilize environmentally-relevant biological enzymes. When …
-
Supramolecular effects in pyridinium compounds and their application towards practical redox flow battery systems
… (CB[*n*]) macrocycles and methyl viologen are leveraged to advance an additive concept for AORFBs that enables stable and tuneable multi electron accessibility – without the need for synthetic modification. By encapsulating methyl viologen in all oxidation states, CB[7] macrocycles …
-
Using the Marcus Inverted Region and Artificial Cofactors to Create a Charge Separated State in <i>De Novo</i> Designed Proteins
… able to attach covalently to a set of different viologens using Copper assisted alkyne-azide cycloaddition (CuAAC) click chemistry. The proteins incorporate zinc porphyrins as the primary electron donor, and an iron porphyrin as a placeholder cofactor or final electron acceptor. The proteins …
-
Sustainable photocatalysis using carbon-based materials through interfacial and solvent engineering
… interaction between carbon dots and methyl viologen enabled efficient and robust charge extraction from carbon dot, which subsequently generated ultra-long-lived radical species, achieving an oxidative quenching pathway. In addition, covalent modification of carbon dots with methyl viologen …
-
Occurrence of pyruvate:ferredoxin oxidoreductase in Campylobacter, Wolinella, Helicobacter and Arcobacter species
… capable of reducing the electron carriers benzyl viologen and metronidazole in the presence of pyruvate. Addition of Clostridium pasteurianum ferredoxin to the metronidazole-linked reaction enhanced metronidazole-reducing activity, suggesting that electron transport to artificial electron carriers …
-
Optofluidic Microreactors for Advanced Photocatalysis
… possible. The photoreduction of methyl viologen by carbon nanodots (CNDs) was studied and compared to theory by modelling reaction pathways. Oxidation states of cobaloximes, that are currently employed as molecular catalysts for solar hydrogen generation, could be studied and analysed in …
-
Studies on cytochromes and electron transport in Methanosarcina thermophila strain TM-1
… exchange chromatography and assayed using methyl viologen as an artificial electron donor. Electron transport from CO to the heterodisulfide of 2-mercaptoethanesulfonic acid (HS-CoM) and 7- mercaptoheptanoylthreonine phosphate (HS-HTP) was reconstituted using carbon monoxide dehydrogenase, …
Page 1 of 3