Projects in RUBION
Adsorption of model surfactants on subsoil samplesHuman Environmental Research - Stumpe, Institute of Geographie, Bergische Universität Wuppertal
Persistent organic pollutants (POPs) are known to have adverse effects on human health and the environment. Thus, an effective risk assessment with concern on POP adsorption potential in the soil compartment is of high interest. The objective of our study was to develop a reliable, rapid and low-cost method which is able to predict the adsorption of two model POPs, 4-n-nonylphenol (NP) and perfluorooctanoic acid (PFOA), in soil samples based on spectral information (MIR) and partial least-square analyses (PLSR). For the model development 96 top- as well as subsoils were used. To characterize the composition of the samples, they were analyzed for particle size distribution, manganese and iron oxide concentration, organic carbon content (SOC), pH and the soil surface area. The KD-values for NP and PFOA were calculated in batch experiments.
Auger-Electron Analysis of Oxide Layers on CopperNano- and Micromechanics, Max-Planck-Institut fuer Eisenforschung GmbH, MPG
Aim of this project is to (i) proof and (ii) quantify the thickness of possible oxide layers on Cu and CuAl systems. The experiments are planned within a large scale micromechanical investigation on dislocation nucleation at coherent twin boundaries, performed at the Max-Planck-Institut für Eisenforschung. So far, using nanoindentation, we have shown that grain boundaries might act as frequent sources of dislocations. However, to ultimately proof this we need to proof the absence of surface oxides.
Bacterial iron acquisitionApplied Microbiology, Faculty of Biology and Biotechnology, Ruhr-Universität Bochum
We investigate bacterial iron acquisition, the role of siderophores, and the role of ionophores.
Funded by: Deutsche Forschungsgemeinschaft
Burried layers in diamond (Group Lorke, University Duisburg-Essen)Ion Beam Analysis and Material Modification, RUBION, Ruhr-Universität Bochum
A burried graphite layer to serve as a gate for a FET should be produced by the implantation of carbon in diamond with an energy of 100 keV to open the possibility to stabilize and manipulate single NV centres.
Characterization of funcional coatingsAnalytical Chemistry — Biointerfaces, Faculty for Chemistry and Biochemistry, Ruhr-University Bochum
The chemistry of organic, functional coatings will quantitatively be analyzed. This concerns coatings prepared by grafting from as well as by grafting to approaches. Also polymer coatings with different crosslinking mechanisms will be investigated by element sensitive chemical analysis. The coatings are at a later stage tested in our research group regarding their low-fouling properties and the results from surface analysis will be correlated to protein attachment and biofouling assays.
Composition and density characterization of transition metal nitride filmsMEMS Materials, Institute for Materials, Ruhr University Bochum
The properties of transition metal nitrides (TM-N) strongly depend on their chemical composition (e.g. TM/N ratio) and density. Both, density and composition are affected by synthesis parameters (e.g. temperature, plasma properties). Transition metal nitrides were synthesized by magnetron sputtering using sets of different process parameters. Mechanical properties like Young’s modulus and hardness are determined by nano indentation and residual stress is evaluated by curvature method. The aim of the project is to identify relationships between synthesis parameters, composition and density and mechanical properties. The project is part of the collaborative research center SFB-TR 87.
Development of a Combined Stimulated Emission Depletion and Scanning Ion Conductance MicroscopeNanoscopy, RUBION, Ruhr-Universität Bochum
This project aims a combining a Stimulated Emission Depletion (STED) and a Scanning Ion Conductance Microscope (SICM) to allow simultaneous, correlated recording of the cellular topography and a protein distribution in living cells with diffraction-unlimited resolution.
Funded by: DFG
Development of STED and SICM instrumentsNanoscopy, RUBION, Ruhr-Universität Bochum
This long-term project aims at developing and optimizing our STED and SICM instrument.
Diffusion of H bearing species in silicate glasses at low temperatures - development of a new experimental techniqueIon Beam Analysis and Material Modification, RUBION, Ruhr-Universität Bochum
The transport of H in glasses at relatively low temperatures (below 200 °C) is relevant for a number of applications such as obisidian dating of archaeological artefacts, palaeoclimate studies, storage of high level nuclear waste and many more. We have developed several new experimental aspects, and in particular (a) the ability to produce H-bearing amorphous thin films to act as a source of H without the presence of free H2O, and (b) the ability to measure low concentrations of H, independent of the speciation, with a high spatial resolution on the nanometer scale. In this project it is intended to use these developments to explore the diffusion of H-bearing species at conditions that have been inaccessible so far. A specific goal is to characterize the compositional dependence of H-diffusion at these conditions and understand the change of diffusion mechanism that leads to a different behaviour from those observed at higher temperatures.
Funded by: DFG, DFG
Diffusion of Nitrogen in diamondNukleare Festkörperphysik (Leiter Jan Meijer), Felix-Boch Institut für Festkörperphysik, Universität Leipzig
The generation of NV centers in diamond is an essential task of quantum technology. NV centers can be used as qubits in quantum computers. For this task it is necessary to address single NVs and to generate them deterministically. The latter is not yet possible and should be the subject of this investigation. It should be clarified whether near-surface nitrogen diffuses. For this purpose, high-purity diamonds are irradiated with 15N, annealed at high temperature and investigated at the University of Munich with ERDA. A complimentary investigation with protons 15N(p,gamma) in Bochum would also be very helpful.
Experimental Simulation of Solar Wind Implantation in Silicate MineralsElectron Microscopy Unit, Electron Microscopy Unit, Hamburg University of Technology
The surface of asteroids and planets, with no atmosphere and a strong magnetic field, in the Solar System (e.g. Moon, Mercury) is impacted by energetic (~1 keV/nucleon) solar wind ions. The solar wind consists of 95% protons, 2-4% He++, and the rest heavy ions. The interaction of ions with minerals, present on the surface of planets and asteroids, changes the structure and chemical composition of the upper few nanometers of the mineral surface and this leads to changes in the optical properties (UV, VNIR) of the material. Since optical spectroscopy is generally used to characterize the surface composition of solar system bodies, it is important to understand the mechanism and products of interaction between ions and minerals. Here, I propose to experimentally implant 40-60 keV Ar++ ions (Fluence: 1e16-1e18 ions/cm2) into thin slices of minerals (e.g. olivine, pyroxene) crystals and pressed powder pellets. After irradiation the samples will be studied using FIB and TEM.
Functional metal oxides for sensor applications (FunALD)Inorganic Materials Chemistry, Faculty of Chemistry and Biochemistry, Ruhr University Bochum
Fabricating metal oxide based nanostructures for their application in gas phase sensors. The project covers precursor development and its evaluation for thin film deposition via thermal and plasma assisted atomic layer deposition
Funtionalized Nanodiamonds for Biomedical Research and TherapyNanoscopy, RUBION, Ruhr-Universität Bochum
Nanodiamonds are biocompatible nanoparticles, which can be functionalized by manifold surface modifications. Therefore, they are an excellent candidate for biomedical and even therapeutic applications. Here we aim at developing nanodiamonds labeled by different lattice modifications, such that they are detectable by various techniques, from microscopy and radiography to magnet resonance imaging. Modifying the nanodiamond lattice instead of its surface ensures that the nanoparticle and its label do not dissolve in physiologic environment. Additionally, it does not alter its interactions with the environment and hence the biocompatibility of the nanoparticle is preserved. A nanoparticle that is not detectable due to surface but to lattice modifications for the first time allows comparable investigations from the subcellular to organism level, eventually leading to the development of nanodiamond based tools for biomedical and therapeutic applications.
Funded by: VolkswagenStiftung
He4 implantation ino thin aluminum foilsIon Beam Analysis and Material Modification, RUBION, Ruhr-Universität Bochum
For experiments at the superconducting cyclotron at the Laboratory Nazionali del Sud of the INFN in Catania He4 targets are prepared by He implantation into thin aluminum foils. The goal is to have a high He concentration in foils as thin as possible. The foils will be characterized by RBS with protons.
High-energy-ion-implantationionimplantation for research and industry, RUBION / rubitec GmbH, Ruhr-Universität Bochum
In the department RUBION ion-beams, in the area of the industrial implantation, ion irradiations in the MeV range are carried out on behalf of customers in cooperation with our partner, the rubitec GmbH. There is a wide range of different ions available. The available energy and dose range depends on the respective species and the wafer size of our customers. The possibilities are determined by us depending on the application for each customer on request. In this field we are certified according to DIN EN ISO 9001: 2015 !
Hydrogen Dynamics in Elementary Reactions on Molybdenum sulfide and carbidePhysical Chemistry, FB 8, Westphalian University of Applied Sciences
Molybdenum Compunds, MoS2 and Mo(2)C are promising new catalysts for electrochemical applications, e.g. water electrolysers. It is planned to study several aspects of hydrogen dynamics in these materials using neutron scattering (ILL Grenoble), electrochemical spectroscopy (WH Recklinghausen) and nuclear reaction analysis (present proposal): hydrogen sorption, fast hydrogen diffusion under reaction conditions, hydrogen modes and substrate phonons as well as ortho-para-conversion of hydrogen on cold catalyst surfaces. Model systems of bulk materials, pure powder samples and electrochemical electrodes will be used. The expected results of these studies are diffusion parameters (binding sites, pathways, activation energies), and key parameters of structure and dynamics of the active surface. Since hydrogen sorption and the motion of several hydrogen species are involved, hydrogen concentrations profiles are required for the full interpretation of the neutron scattering results.
Implantation of Ni ions in diamond to create novel defect centersUltrafast Quantum Optics and Optical Metrology, Clarendon Laboratory, University of Oxford
In this project we would like to implant Ni into ultrapure as well as p-doped synthetic diamonds to create a class of inversion-symmetric Ni defects, the nickel vacancy center (NiV), which so far hasn't been studied in great detail. Theoretical investigations and preliminary experiments suggest that the NiV could offer electronic properties excelling those of the known color centers such as NV and SiV and the defects might therefore be of great interest for quantum technologies. We will use the samples fabricated at RUBION to perform optical spectrocopy experiments at high-resolution to validate the theoretically predicted electronic structure of the defect on an ensemble and single-defect level.
Investigating the composition of perovskite layers applied into electroluminescent devices such as lasers, and LEDsRiedl Group, Chair of Electronic Devices, University of Wuppertal
The work includes material development and structural Layering of perovskite for electroluminescence and laser applications. Different layer formation procedures such as pure liquid phase processes, pure vacuum deposition, as well as hybrid deposition processes are demonstrated. The work aims to study and optimize luminescence quantum efficiency and optical amplification and to understand the relationship between composition / structure and optical amplification. And then, selected materials are integrated into electroluminescent devices.
Measurement of alpha-induced reaction cross section on Ru-isotopesZilges, Institute for Nuclear Physics, University of Cologne
One major nuclear-physics uncertainty for the prediction of branching points in the γ-process reaction network is the α+nucleus optical model potential at sub-Coulomb energies. To improve the scarce experimental database of α-induced reaction cross sections, our group is interested in measuring the (α,γ) cross sections on ruthenium isotopes via the 4π-summing method at RUBION. We plan to measure the cross section at alpha energies from 12 MeV down to ca. 7 MeV.
Modular advanced practical: 3[H]-ouabain binding to thyroid hormone stimulated neural cultures (WS1819)Electrobiochemistry of Neural Cells, Department of Biochemistry II, Ruhr-Universität Bochum
This practical lab course is part of the Master studies of Biochemistry and iSTEM.
One week lab course ion beam analysisAdvance Exercise Course Physics, Experimental Physics, Ruhr-University Bochum
Advanced practical experiments at the accelerators for students from the Ruhr University Bochum and Paderborn University.
Ouabain binding study on cell cultures from the central nervous systemElectrobiochemistry of Neural Cells, Department of Biochemistry II, Ruhr-Universität Bochum
In the course of this project cell cultures will be obtained from postnatal rats. These cultures primarily composed of neurons and astrocytes will be treated with growth factors or other proteins and factors that are capable of modulating neuronal excitability. Our aim is to test the hypothesis that an increased excitability in neurons also leads to an upregulated expression of Na+/K+-ATPase. We use Tritium-labeled ouabain which selectively binds to the Na+/K+-ATPase to determine the density of this enzyme in the cell membrane.
Prekursor incorporation experimentsApplied Microbiology, Faculty of Biology and Biotechnology, Ruhr-Universität Bochum
Using radiolabeled precursors in incorporation experiments, we analyze the antibacterial mechanism of action.
Proteomic response of bacteriaApplied Microbiology, Faculty of Biology and Biotechnology, Ruhr-Universität Bochum
We use pulse-labeling to investigate the proteins newly synthesized in response to stress, e.g. antibiotic treatment.
Funded by: Deutsche Forschungsgemeinschaft, National Institutes of Health
Rare-earth-based single photon sources for quantum telecommunicationRare Earths, 3rd Institute of Physics, University of Stuttgart
The project aims at the realization of single photon sources in the telecom wavelength regime, based on single rare-earth ions (like erbium or ytterbium) precisely doped into optical crystals by means of ion implantation (up to 200nm below the surface). The main advantage of the proposed single photon sources are their true single photon emission, their fourier-limited linewidth and the ability to store emitted photons directly in a medium based on rare-earth ions (straight forward interfacing). The typically low fluorescent signal of single erbium/ytterbium ions can be boosted by orders of magnitude through coupling them to optical resonators (fabricated from thin film lithium niobate) with high Q factors. The single photon source behaviour will be assessed by the indistinguishability of the emitted photons in a Hong-Ou-Mandel experiment.
RBS measurements to identify the composition and thickness of targets for accelerator experimentsZilges, Institute for Nuclear Physics, University of Cologne
At the Tandem Accelerator Laboratory of the University of Cologne experiments ar performed in the fields of Nuclear Structure and Nuclear Astrophysics. For the data analysis it is mandatory to know the exact composition and thickness of the targets. In the present beam time we would like to study six targets with the approximate thicknesses: 0.5 mg/cm² 130Te on 1 mg/cm² 181Ta 0.4 mg/cm² 128Te on 1 mg/cm² 181Ta 1 mg/cm² 164Dy on 1.6 mg/cm² 197Au 0.5 mg/cm² 102Ru on 1.3 mg/cm² 197Au 0.4-0.5 mg/cm² 104Ru on 1.3 mg/cm² 197Au 0.2 mg/cm² 104Ru on 1.3 mg/cm² 197Au From previous measurements we know that the TBS setup ab RUBION is ideally suited for such studies.
Thermography for the detection of soil propertiesHuman Environmental Research - Stumpe, Institute of Geographie, Bergische Universität Wuppertal
Spatio-temporal analyses of soil properties are important for more profound insights into soil processes. Up to now, non-invasive approaches analyzing physical and biological soil properties and dynamics at the microscale are not available due to methodological, instrumental, and analytical challenges. In this study, we evaluate the use of active and passive infrared thermography (IRT), a non-invasive and non-contact technique, for the detection of surface temperature-based parameters on soil surfaces. The potential and possibilities of IRT were analyzed with a focus on the detection and calibration of soil moisture using active IRT and the determination of microbial activity using passive IRT. A pool of 51 soil samples was used to cover a wide range of chemical, physical, and biological soil properties. The samples were rewetted to 16 different moisture contents, filled into vessels, and placed in an air-proof glove box with an adjusted relative humidity of about 92% to reduce soil drying. Immediately after
Using infrastructure of the Bandow labApplied Microbiology, Faculty of Biology and Biotechnology, Ruhr-Universität Bochum
This "project" covers a conglomerate of activities that entail the use of infrastructure of the Bandow lab that is located at RUBION, but does not entail work with unstable isotopes.