Conductive metal-oxide nanoparticles on synthetic boron-doped diamond surfaces

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The steel industry generates enormous quantities of iron oxide waste powder (IOWP) from acid regeneration of spent pickling liquor. IOWP is hazardous due to its high acidic and metal compositions, which calls for strategies to safely manage it. In this study, IOWP was utilized in synthesis of magnetite nanoparticles (Fe 3 O 4 NPs) through co-precipitation. The synthesis parameters including NaOH concentration (15–25%), reaction time (1–3 h), and temperature (50–100 °C) were optimized with central composite

Electrodeposition has been widely used to develop micro-mechanical devices because it offers high dimensional accuracy, flexibility, and relatively low cost. In devices such as mechanical watches, micro-components are required to be made from non-magnetic, hard, and wear-resistant materials. Copper is a common non-magnetic material used in the electrodeposition process, but its intrinsic low strength and soft mechanical behavior limit its use in such applications. These limitations can be overcome by devel

The de novo design of enzymes remains a central challenge, requiring consideration of catalytic mechanism and optimization across biochemical and biophysical criteria. To capture these criteria, we draw on principles from evolutionary biology. Here, we present dEVA (design by EVolutionary Algorithm), a multi-objective design framework for structure-based protein design. We apply dEVA to the zero-shot, de novo design of metalloenzymes by optimizing for the coordination sphere of catalytic metals. We fully ch

Direct (non-mediated) electrochemical oxidation of ammonia on boron-doped diamond (BDD) electrode proceeds mainly at high pH (>8) via free ammonia (NH3) oxidation. To enhance ammonia oxidation on BDD at low pH (

The aim in this project was the optimization of LaFeO3-based perovskite materials for oxygen separation membranes (OSM). The work was carried out by the Laboratory for High Performance Ceramics, Empa in collaboration with the Laboratory for Industrial Energy Systems, LENI, EPFL and the Ceramics Laboratory, LC, EPFL. The ceramic material of interest is a mixed conductor for oxygen ions and electrons at high temperature (800°-900°C) and therefore can separate oxygen from nitrogen with 100% selectivity when

The goal of this paper is to develop some aspects of the deformation theory of piecewise flat structures on surfaces and use this theory to construct new geometric structures on the moduli space of Riemann surfaces.

A review. Boron-doped diamond (BDD) thin films were grown on various substrates by chem. vapor deposition to achieve a new electrode material that possesses unique electrochem. properties. This electrodes could generate hydroxyl radicals under polarization at high anode potentials, and these hydroxyl radicals could be spin-trapped by 5,5-dimethyl-1-pyrroline-N-oxide (DMPO). The generated hydroxyl radicals had low electrochem. activity and high chem. reactivity, and these properties were attributed to the we

Diamond films with different levels of doping have been the subject of applications and fundamental research in electrochemistry, opening up a new branch known as the electrochemistry of diamond. The electrochemical properties of diamond mostly depend on the operating conditions during the deposition of the film and on the treatment of the surface. The absence so far of a standard procedure in the production and treatment of diamond films has created a wide range of diamond quality and properties. This work

The electrochem. oxidn. of EDTA was studied at boron-doped diamond (BDD) electrodes. Cyclic voltammetry in the potential region of water stability showed that EDTA is oxidized in an irreversible 2-electron-transfer mechanism. No fouling phenomena were noticed on the electrode surface. At high anode potential, an oxidn. mechanism of EDTA involving hydroxyl radicals, formed during water discharge, was proposed. The model previously developed for org. oxidn. at nonactive anodes was successfully used in order t

The aim of this work has been to design, and fabricate a miniaturized electrospray-type interface for mass spectrometry analysis, which allows the nebulization of solutions by applying a high potential difference between the source and the mass spectrometer. The fabrication of the nanospray emitter is based on UV-laser photoablation of polymer substrates. Thick-film channel flow electrodes can be integrated in the microfluidic system, allowing the application of a high voltage to generate electrospray from

The concept of non-diamond sp2 impurity states as charge transfer mediators on boron-doped diamond (BDD) surface was suggested as an explanation for the electrochem. behavior of synthetic diamond-based electrodes. To verify this concept, graphite particles (sp2) were deposited on diamond electrodes (sp3) by mech. abrasion. The behavior of the so prepd. diamond-graphite composite electrodes were compared with those of as-grown (BDDag) and those after mild anodic polarization (BDDmild). Outer-sphere electron

The oxidn. of nickel gauze catalysts by O2 was investigated by transient response methods. Qual. description of the exptl. transient responses have shown that the oxidn. of metallic nickel proceeds in two stages. The first step is a fast dissocn. of gaseous oxygen on the catalytic surface, followed by oxygen diffusion from the surface into the bulk. This slow second step explains the long tailing obsd. from the exptl. transient responses. Furthermore, a rise of temp. was obsd. during the nickel oxidn. A kin

The redn. of NO by CO or C3H6 in the presence of O2, a reaction of great technol. importance, was studied on porous polycryst. Rh catalyst films using a single-chamber and a wireless bipolar cell configuration. In the latter case the Rh catalyst films were deposited on the inner side of a YSZ tube, while 2 Au films deposited on the outer side of the tubes were used to polarize the Rh catalyst surface. The exptl. conditions used in this study were close to those in the exhaust of a lean burn or diesel engine

A 33-residue de novo designed peptide ligase is reported which catalyzes the template-directed condensation of suitably activated short peptides with catalytic efficiencies in excess of 105 ([kcat/Km]/kuncat). The ligase peptide, derived from natural and designed a-helical coiled-coil proteins, presents a surface for substrate assembly via formation of a hydrophobic core at the peptide interface. Charged residues flanking the core provide addnl. binding specificity through electrostatic complementarity. Add

Recent progress made in our lab. in the field of electrochem. promotion of heterogeneous catalytic gas reactions is reviewed. The phenomenon consists of electrochem. polarization of the catalyst/solid electrolyte interface resulting in a dramatic, non-Faradaic modification of the catalytic reaction rate. Two main aspects have been addressed, the mechanistic interpretation of the phenomenon and the development of bipolar cell configurations suitable for practical applications. Fundamental studies were made u

B-doped diamond films were deposited by large-area hot filament chem. vapor deposition (HFCVD) on Si and different industrial electrode materials, such as Ti, Zr, Nb, Ta, W, and graphite, with areas up to 50 * 60 cm2. B-doping levels ranging from 50 to several thousand ppm were realized using trimethylborate. These electrodes are characterized in terms of their material and electrochem. properties by SEM, Raman spectroscopy, secondary ion mass spectrometry (SIMS), and cyclic voltammetry. Oxidn. of org. comp

The influence of the polarization of the RuO2/YSZ interface on the electrochem. promotion of RuO2 catalysts was studied by temp. programmed desorption and high temp. cyclic voltammetry measurements. The desorption activation energy of adsorbed oxygen decreases from 2.32 eV at 380 mV to 7.26 eV at 600 mV by polarizing of the RuO2/YSZ interface. A higher oxide (RuO3) might be formed at the RuO2/YSZ interface during anodic polarization. [on SciFinder (R)]

Electrochemistry can bring important contributions to current applications, such as organic synthesis or wastewater treatment. In an environmental context, electrochemical processes are interesting substitutes to the conventional wastewater treatment techniques (STEP). In this work, we have studied different types of electrodes, in order to develop a predictive model, so as to propose an electrode concept suitable for these two processes. The metal support/conducting oxide electrodes can behave in two disti

We study the deposition and the very first steps of nucleation and growth of Ag on Pd(100) with thermal energy atom scattering. This technique is a very sensitive and nonperturbing probe to surface point defects, which permits an in situ and in-time monitoring of the deposition. The intention of this paper is to give a detailed description of the approach used in our work. The form of the specularly reflected helium signal as a function of coverage and surface temperature is compared to a theoretical curve,

We describe a general method for the quantitative determination of the interlayer mass transport in epitaxial growth. Through measurement of the nucleation rate on top of islands as a function of island size and temperature, the additional barrier for an adatom to descend the step edge Delta E(s) can be determined with high accuracy. This approach is applied to the growth of Ag on the (111) surfaces of Ag and Pt. In the homoepitaxial system, the barrier is found to be Delta E(s) = 120 +/- 15 meV, whereas in

Conductive metal-oxide nanoparticles on synthetic boron-doped diamond surfaces

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Synthesis of magnetite nanoparticles from steel iron oxide waste as a resource recovery strategy: An optimization and characterization study

Electrochemical deposition of composite materials: unravelling the process-structure-property nexus

Zero-shot design of a de novo metalloenzyme

Direct and mediated electrochemical oxidation of ammonia on boron-doped diamond electrode

Optimization of mixed conducting perovskites for the application in dense ceramic oxygen separation membranes, used in partial oxidation of natural gas to synthesis gas

On the moduli space of singular Euclidean surfaces

Application of synthetic boron-doped diamond electrodes in electrooxidation processes

Control of electron transfer kinetics at boron-doped diamond electrodes by specific surface modification

Electrochemical oxidation of ethylenediaminetetraacetic acid (EDTA) on BDD electrodes: Application to wastewater treatment

Polymer nanospray interfaces for on-line electrochemically induced modifications : application to protein mass spectrometry

Electron transfer kinetics on composite diamond (sp3)-graphite (sp2) electrodes

Mathematical modelling of the unsteady-state oxidation of nickel gauze catalysts

Electrochemical promotion of conventional and bipolar reactor configurations for NO reduction

A Synthetic Peptide Ligase. Mechanistic Investigations

Electrochemical promotion of catalysts for gas phase reactions

Properties of diamond electrodes for wastewater treatment

Electrochemical promotion of RuO2 catalysts for the gas phase combustion of C2H4

Oxydation électrochimique du phénol sur des électrodes du type métal support/dépôt conducteur

Surface mobility of Ag on Pd(100) measured by specular helium scattering

Interlayer Mass-Transport in Homoepitaxial and Heteroepitaxial Metal Growth