Technische Universität Bergakademie Freiberg

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Browsing Technische Universität Bergakademie Freiberg by Subject "4"

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  • ItemOpen Access
    3 tomographic data sets of nano-CT measurements of a 30:70 vol-% mixture of talcum and saxolite
    (Technische Universität Bergakademie Freiberg, 2022-09-02) Ditscherlein, Ralf
    All 3 data sets are sub-volumes (Field of View approx. 65 µm) of a total sample of a particle mixture of talc and saxolite fixed in a matrix by means of epoxy resin and spacer particles (nanometre-sized carbon black particles, 150 nm equivalent spherical diameter). The primary analysis was carried out using nano-CT. The reconstructed result data are stored in the form of TIF files as sectional images (folder "rotated"). In addition, a correlation was carried out by means of EDXS analytics, the chemical information of which was used to train a segmentation algorithm. Since EDXS analysis requires a planar surface, the sample was further processed using FIB. The divergence of the ion beam produces a slight angular deviation from the perpendicular of the nano-CT volume, which necessitated a rotation of the initial volume data (--> "rotated"). The correlated result data of the particle-discrete phase information are also stored ("rotated segmented").
  • ItemOpen Access
    Colloidal probe atomic force microscopy measurements on pristine gas bubbles, agglomerates and particle-laden gas bubbles
    (Technische Universität Bergakademie Freiberg, 2024-07-08) Nicklas, Jan
    This dataset contains experimental Atomic Force Microscopy (AFM) force-displacement measurements of poorly wetted alumina particles (colloidal probes) < 15 µm interacting with pristine gas bubbles, agglomerates and particle-laden gas bubbles (hetero-coagulates) in an aqueous environment. The data was generated in the context of the Collaborative Research Center CRC 920 (Project ID 169148856 – subproject B04) that is funded by the German Research Foundation (DFG). The data set is of interest for researches that study the agglomeration or hetero-coagulation in liquid environment, and it is expected to be of particular interest to those that are concerned with the simulation and modeling of these processes (for example by Discrete Element Method). The AFM raw data was baseline corrected to increase the accessibility of the data sets to those less familiar with the AFM. A detailed interpretation of the AFM data in this repository is found in https://doi.org/10.1021/acs.langmuir.3c01781 and https://doi.org/10.1016/j.colsurfa.2024.134660.
  • ItemPublic Metadata
    DFG 465144480: Boron-free self-glazing Al₂O₃-C refractories
    (Technische Universität Bergakademie Freiberg, 2026-04-01) Roungos, Vasileios; Gehre, Patrick; Salpagarov, Eldar; Aneziris, Christos G.
    Al₂O₃-C refractories are extensively used as functional components in the continuous casting of steel. These high-duty products such as submerged entry nozzles, ladle shrouds, and monoblock stoppers contain up to 30 wt.-% carbon and present excellent mechanical, thermal and chemical properties, enabling the cost- and quality-effective implementation of the continuous casting process. Ceramic glazes are externally applied on Al₂O₃-C flow control refractory products to protect carbon from oxidation. These glazes typically contain boron. However, the increasing requirements for clean steel technology along with environmental- and health issues associated with boron compounds will make the utilization of boron-free glazes a necessity in the upcoming years. New boron-free self-glazing Al₂O₃-C formulations with sodium carbonate, wollastonite and magnesia additives were developed with the assistance of the FactSage software tool. These compositions presented a softening point in the range of 1000-1100 °C for self-glaze formation, which is the typical preheating temperature range for Al₂O₃-C functional refractory products. In addition, the influence of particle packing on their oxidation resistance was investigated, based on established particle size distribution models.
  • ItemPublic Metadata
    DFG 465144480: Impact of cyclic CIP on the oxidation resistance and physical properties of a newly developed boron-free self-glazing Al2O3-C refractory
    (Technische Universität Bergakademie Freiberg, 2026-03-31) Roungos, Vasileios; Gehre, Patrick; Brachhold, Nora; Fischer, Undine; Aneziris, Christos G.
    The impact of cyclic cold isostatic pressing (C-CIP) on the oxidation resistance and physical properties of a boron-free self-glazing Al2O3-C refractory for steel casting applications was investigated. Pulsations with amplitudes of 20, 40 and 65 MPa were thereby applied either at maximum isostatic pressure or at increasing pressure. The maximum isostatic pressures applied were 80, 100 and 150 MPa, respectively. Both cycling pressurizations improved the oxidation resistance and physical properties. Higher densities were obtained at higher cycling amplitudes, in particular when the pulsations were applied at maximum isostatic pressure. In addition, the evolution of a broader pore size distribution with peaks at pores larger than 4 μm was found. The pore size distributions of the samples pressed by C-CIP at increasing pressure were narrower, with higher peaks at smaller pore sizes in the area of 2.5 μm. It was shown that utilizing cycling pressurization enables tailoring of pore sizes in carbon-bonded refractories as well, providing a powerful tool for the material design of refractories.
  • ItemOpen Access
    Epoxy-Based Particle Sample Preparation with Nano-Graphite as Spacer - RAW Data (Particle Sample Preparation) - Different mixtures (by volume) of graphite-nanoparticles and analysis particles
    (Technische Universität Bergakademie Freiberg, 2020-05-08) Ditscherlein, Ralf
    To get good image segmentation results in tomographic analysis methods, particles has to be seperated from each other while embedding them into a matrix. Low X-ray absorbing nano-graphite below the voxel resolution of the system is mixed with the analysis particles to form a shell to avoid direct particle-particle contact. After mixing it with epoxy resin, the paste is sucked into a polymeric tube of 2 mm inner diameter. After hardening, the formed cylinder was scanned with an X-ray microscope (ZEISS Xradia Versa 510) with the following parameters: 80 keV, 7 W, 360°, 2001 projections, 1 s exposure time, 2 µm voxel size, binning 2. After scannning, the following filters were applied while reconstruction with ZEISS reconstructor: Beam Hardening Correction 0.05, Smoothing 0,7. Detailed overview of the parameters is summarized as screenshots within the repository. To determine an optimal mixture of the two components, the following volume-fractions were analysed: Nanoparticle:Particle 20vol-%:80vol-% 40vol-%:60vol-% 60vol-%:40vol-%
  • ItemOpen Access
    Experimental Cake Filtration Data and Code for Analysis, Graph Generation
    (Technische Universität Bergakademie Freiberg, 2021-12-08) Buchwald, Thomas
    This collection belongs to the doctoral thesis "Nonlinear Parameter Estimation of Experimental Cake Filtration Data". Most of the content are Jupyter notebooks which contain the Python code which reproduces graphs found in the thesis from the original experimental data. The lab practice dataset that contains 500 filtration experiments is contained in the folder for section 3.5. The notebooks are not strictly sorted by section. At any rate, the Readme will guide you to the notebook which produces a certain graph, if it is not part of the main notebook of that specific section. The original Python environment was set up with Anaconda. Please use the provided .yml file to create a Python environment which contains all the necessary packages. Some notebooks may not work with the most current versions of the packages, so updating is not necessarily a good idea.
  • ItemOpen Access
    Fully saturated and dewatered filter cakes at different resolutions
    (2021-08-23) Löwer, Erik
    Appendix to Publications A to E with investigations of different particle systems (material, size and shape variation). X-ray tomography image of fully and partially dewatered filter cakes. The initial slurries contains mica, dolomite, quartz, limestone or glass particles suspended in a potassium iodide-glycerol brine. The different shaped particles were separated by cake-forming filtration followed by dewatering. All filtration and dewatering experiments took place in an in situ apparatus within the Zeiss Xradia 510 X-ray microscope. The filter cake is dewatered until the minimum degree of saturation is reached within the pore space. A scan is taken at the equilibrium state before and after dewatering. A small section in the center of the desaturated filter cakes was additionally measured at a significantly smaller field of view and higher resolution in order to be able to determine the local contact angle in addition to the saturation distribution and the size of the individual liquid bridges.
  • ItemOpen Access
    High-resolved X-ray tomography scan of dewatered filter cakes and sessile droplets
    (2021-08-23) Löwer, Erik
    X-ray tomography image of dewatered filter cakes at irreducible saturation. The initial slurry contains Al2O3 particles suspended in a potassium iodide-glycerol solution. These were separated by cake-forming filtration with subsequent dewatering. All filtration and dewatering experiments took place in an in situ apparatus within the Zeiss Xradia 510 X-ray microscope. High resolution scans are acquired in the equilibrium state after dewatering at different locations within the cake structure to measure the local three-phase contact angle. The data are validated by sessile droplet experiments on substrates of the same material within the X-ray microscope.
  • ItemOpen Access
    Influence of a pyrolysis at different temperatures on the mechanical recycling efficiency of Li-ion batteries
    (Technische Universität Bergakademie Freiberg, 2024-12-12) Kaas, Alexandra; Wilke, Christian; Born, Jannik; Ahuis, Marco; Kwade, Arno; Peuker, Urs
    The integration of a pyrolysis stage into the mechanical recycling process of Li-ion batteries is supposed to improve the decoating of the electrodes, the recovery of valuable components and the overall quality of the products. The effectiveness of the pyrolysis process depends on the applied temperature as the various components of a Li-ion battery melt, evaporate and decompose at different temperatures. The decomposition temperature of the cathode binder is a crucial factor in the thermal mechanical recycling process. Temperatures below this threshold have a negative impact on the recovery rates, as the melting of binder and plastics reduces the efficiency of the recovery process. Conversely, higher temperatures facilitate the recovery of the cathode coating metals (Ni, Co, Li) into the black mass. The majority of the metals (92-98%) are recovered and, following hydrometallurgical treatment, can be reused for cell production, thereby closing the loop and reducing the consumption of raw materials and enhancing the sustainability of batteries. Moreover, the decomposition of the organic components, including binders and plastics, improves the quality of the products, thereby reducing the necessity and extent of further treatment.
  • ItemOpen Access
    Influence of shredder and mill settings on the material recoveries and product qualities of a two-stage mechanical recycling process of automotive lithium-ion batteries
    (Technische Universität Bergakademie Freiberg, 2025-03-12) Kaas, Alexandra; Wilke, Christian; Peuker, Urs
    For a two stage shredding and milling process the yield of black mass and the elemental recovery of critical elements Ni and Li s investigated. I can be shown that the quality of the products resulting from the mechanical recycling of lithium-ion batteries significantly depends upon the parameters employed during the shredding process. Modifications to the settings have the potential to exert a considerable impact on the particle size, liberation of composites and de-coating of electrodes. The discharge grid size employed during the first shredding step shows a significant influence on the downstream separation behaviour of the casing material and separator foil. The mill speed utilised during the second comminution step determines the separation achieved between the cathode and anode. A reduction in grid size employed during the first shredding stage results in an increase in black mass yield, although the recovery of the casing is diminished. In total Ni recovery for all setting combinations is similar, a lower recovery in the first shredding step is compensated by a higher recovery after the second comminution. It was observed that an overall increase in the mill speed above 1750 rpm resulted in elevated levels of copper contamination within the black mass. The influence of eleven distinct combinations of shredder and mill settings on the black mass yield and its composition, the recovery of the separator foil and the casing, as well as the separation behaviour of the anode and cathode, were investigated.
  • ItemOpen Access
    Jupyter Notebook zur Erstellung der Abbildungen des Aufsatzes "Beschreibung von Trennoperationen mit mehrdimensionalen Partikeleigenschaftsverteilungen"
    (Technische Universität Bergakademie Freiberg, 2022-07-01) Buchwald, Thomas
    Jupyter Notebook, welches die Rohdaten bei Bedarf einliest und die Diagramme aus den Rohdaten erstellt. Falls keine Python-Installation zur Verfügung steht, wird ein HTML des Notebooks bereitgestellt. Dabei werden nicht die finalen Diagramme erstellt; diese ergeben sich erst durch Zusammensetzen in einem Vektorgrafikprogramm.
  • ItemOpen Access
    Multi-Scale Tomographic Analysis for Micron-Sized Particulate Samples - RAW Data
    (Technische Universität Bergakademie Freiberg, 2019) Ditscherlein, Ralf; Martins de Souza e Silva, Juliana
    This repository includes the reconstructed TIFF-files from multiple scale tomographic analysis of particles in an embedding matrix (overall volume and 3 sub-volumes in 2 different magnification steps): LARGE (low-resolution) (due to filesize partioned in part I, II, III, IV and V) 1 large volume of particle mixture (50/50) of spheres (0.2 - 2 µm) and fibres (diameter: 10 µm length: 100 - 1000 µm) embedded in a matrix (wax, 15 vol-%). The large volume was extracted with an automated syringe into a small polymeric tube (diameter: 1.8 mm) and shock frozen. After that the sample was mounted on top of a needle pin and scanned with a micro-CT (ZEISS Versa510) at 80 keV, 7 W, low energy filter LE4, exposure time 2 s, optical magn. 4x, 3201 projections, 360°, Binning 2, Voxelsize 1.5 µm SubSample - MEDIUM (medium-resolution) (SubSample 1, 2, 3) After the scan, the LARGE volume was cutted in small disks and cutted a second time in little bars. Again, mounted on top of a needle pin and scanned with same parameters, BUT with 40x optical magnification and 25 s exposure time to go down to a system limit of 0.3 µm Voxelsize (again with ZEISS VERSA510). This was done 3 times in different heights of the LARGE volume SubSample - HIGH (high-resolution) (SubSample 1, 2, 3) After that, all SubSamples were scanned again with a nano-CT (ZEISS ULTRA810) at 5.4 keV, 60 s exposure time, 901 projections, 180°, Binning 1 to reach Voxelsize of 0.064 µm
  • ItemOpen Access
    Research data for: "Guest Particle Deformation and Powder Flow Behavior in Mechano-Fusion: Linking Microscopic Structure to Macroscopic Performance"
    (Technische Universität Bergakademie Freiberg, 2025-09-09) Seyffer, Judith Miriam
    The research data set comprises the process data of mechano-fusion experiments (machine raw data and experiment meta data) and measurement data of different characterization methods (laser diffraction, BET specific surface area, powder flowability) for the investigated particle samples after mechano-fusion. The data corresponds to the publication "Guest Particle Deformation and Powder Flow Behavior in Mechano-Fusion: Linking Microscopic Structure to Macroscopic Performance" by Seyffer et al. (2025). Further information can be found in the provided Readme file and in the corresponding publication.
  • ItemOpen Access
    Research data for: "Particle size analysis and beyond - laser diffraction and derived information regarding structures of mechano-fusion coated particles"
    (Technische Universität Bergakademie Freiberg, 2026-06-02) Seyffer, Judith Miriam
    Laser diffraction (LD) is widely used for the analysis of particle size distribution (PSD). Due to the structure of dry-coated mechano-fusion particle systems, the interpretation of the PSD remains challenging. This study investigates hetero-aggregate coating structures of alumina host particles (median diameter 43.3 μm) with polystyrene guest particles (mean diameter 3.5 μm) in dry LD measurements and how dispersion conditions influence the PSD. Gentle freefall dispersion preserves coating structures and yields a monomodal PSD consistent with expected coated particle size. Differences in the PSD between samples of coated particles prepared under different process conditions are only observed using highintensity dry dispersion. High-intensity dispersion alters the aggregation state by detaching guest particles, leading to bimodal PSD. The plateau values in the cumulative distribution furthermore exceed theoretical guest volume fractions. Experimental measurements are combined with simulations of diffraction patterns and inverse reconstruction. Simulations qualitatively support the experimental findings by linking particle arrangement and deformation to reconstructed PSD features. The apparent overrepresentation is attributed to guest particle deformation and comminution, biasing the volume-weighted PSD. Hence, LD provides more than particle size information: aggregation state, dispersion-induced changes, and guest particle deformation are revealed, enhancing the applicability of LD for quality control of dry-coated hetero-aggregates.
  • ItemOpen Access
    Supplemental Material to 'Estimation of Rolling Process Variation by Usage of a Monte-Carlo Method'
    (Technische Universität Bergakademie Freiberg, 2022-12-13) Weiner, Max
    This repository contains all necessary data to reproduce the results of *Estimation of Rolling Process Variation by Usage of a Monte-Carlo Method* published at ESAFORM2023. The contents consist of data files as well as code for analysis and simulation.
  • ItemOpen Access
    Supplemental Material to 'Numerical simulation of periodic surface structures created by direct laser interference patterning'
    (Technische Universität Bergakademie Freiberg, 2023-01-11) Heinrich, Martin
    Supplementary Data for the following Publication: M. Heinrich, B. Voisiat, A.F. Lasagni, R. Schwarze. "Numerical simulation of periodic surface structures created by direct laser interference patterning". PLOS ONE (2023). It contains all raw (simulated) data in OpenFOAM format as well as extracted data sets used for the previously mentioned publication.
  • ItemOpen Access
    Supplemental material to Fritzsche et al. (2022), "Toward unraveling the mechanisms of aerosol generation during phonation"
    (Technische Universität Bergakademie Freiberg, 2022) Fritzsche, Lisa
    Supplemental material and supporting information for the publication: Fritzsche, L., Schwarze, R., Junghans, F., & Bauer, K. (2022). Toward unraveling the mechanisms of aerosol generation during phonation. Physics of Fluids, 34(12), 121904. (DOI: 10.1063/5.0124944). For the purpose of investigating the atomization of respiratory mucus during phonation, a new experimental setup was designed which emulates the vocal folds, their oscillating movement and the expiratory air flow in a simplified manner. The primary atomization of an artificial mucus can be observed. Based on the shadowgraphy measurements carried out, droplet size spectra were evaluated and the influence of the parameters flow rate, oscillation frequency and amplitude was investigated. Furthermore, high-speed recordings allowed the visualization and discussion of the droplet formation mechanisms.
  • ItemOpen Access
    Supplementary data for “Computational workflow for the characterization of size, shape and composition of particles and their separation behavior during processing“
    (Technische Universität Bergakademie Freiberg, 2024-12-06) Leißner, Thomas
    The data set comprises the raw data for the publication Weber et al. (2025). It contains the reconstructed volume graphics (tif-image stack) of the feed material and both products of magnetic separation. The tomograms were recorded with the Zeiss Xradia 510 Versa X-ray microscope. Measurement and reconstruction parameters can be found in the readme file. The false color images of the SEM-EDS from the Mineral Liberation Analyzer are also included. Further information can be found in the corresponding publication Weber et al. (2025) "Computational workflow for the characterization of size, shape and composition of particles and their separation behavior during processing."
  • ItemOpen Access
    Supplementary information to the publication “Influence of foam composite in lithium-ion battery packs on their mechanical recycling”
    (Technische Universität Bergakademie Freiberg, 2025-05-23) Rademacher, Paul; Kaas, Alexandra; Wilke, Christian; Peuker, Urs A.
    Supplementary data to the following paper. Lithium-ion batteries (LIB) make an important contribution to the energy transition as energy storage devices for mobile and stationary applications. The recovery of the valuable materials contained in the lithium-ion batteries after their end of life is of central importance for the development of a circular economy in line with the concept of sustainability. Mechanical recycling is to be seen as a first step in this process. With processes for the mechanical recycling of LIB that have already been successfully developed and implemented, it is possible to recover most components of a LIB i.e., the materials of the anode, cathode and separator foils as well as the casing. The concentrate of the coating of the electrode foils, which is called black mass, becomes an intermediate product for hydrometallurgical recycling processes for the recovery of lithium, among other materials. Some OEM of the automotive industry are about to introduce cell-to-pack-technologies, in which individual LIB-cells are fixed and stabilised in their position inside the large battery pack with the aid of a foam material, thereby adding further materials to the battery pack. The effects of the foam on the recycling are not known yet. Within the scope of this experimental work, several technological variants to enrich and separate the foam as an individual material fraction were investigated. The holistic aim is to minimise contamination from the foam in the valuable fractions. Two different types of foam and their effect on the purity of the recycling products were analysed.
  • ItemOpen Access
    Supplementary material for the publication "Thermodynamically consistent derivation of excess Raman spectra "
    (Technische Universität Bergakademie Freiberg, 2023-12-12) Bräuer, Andreas; Willger, Miriam
    The supplementary material includes all raw data used for the publication. These are the recorded mixture Raman spectra for the binary mixtures acetone-water, acetone-n-heptane, acetone-n-hexane, acetone-cyclohexane and acetone-ethanol at 25°C as .txt files. The files are located in the subfolders of the respective mixture name in the 'Data' folder. The 'Data' folder also contains the raman shift ('ramanshift' ,.txt) for all spectra. In addition, the literature data for the mixture densities and refractive indices can be found in the .xlsx file 'refractive_index_density'. The python code used for the evaluation, which is also used to generate the figures shown in the publication, can be found in the 'Code' folder. A description on how the code works can be found in the 'Read me' file.