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Item type:Research Data, Access status: with files , Research data for: Shaping the electric field: Overcoming geometric inhomogeneities in the electrochemical fabrication of mesoporous materials(2026-10-05)Research data underlying the study of how the internal geometry of an electrochemical etching cell shapes the current distribution and hence the homogeneity of mesoporous silicon layers. Three PTFE cells differing in the height of the internal widening step (A: 4.75 mm, B: 8.0 mm, C: 25.0 mm) were compared, using an identical pulsed galvanostatic recipe on boron-doped Si(001) (0.01–0.02 Ω cm) in 2:3 HF(48 %)/ethanol. Simulation - COMSOL Multiphysics models (6.4: fielddistribution_*.mph, 6.2: hyperelastic_seal_*.mph): fielddistribution_*.mph are 2D axisymmetric primary-current-distribution models built from the CAD of each cell, including parametric sweeps of step height, seal overlap and an immersed insulating obstacle. hyperelastic_seal_*.mph are the solid-mechanics models of the compressed O-ring that supply the deformed seal profile used in the field models. Model-to-cell assignment: V0 = cell B, V2 = cell A, V5p3 = cell C. NIR - Spatially resolved reflectance area scans (HDF5): Each file holds one 40 × 40 mm raster of 115 × 115 = 13 225 points at 0.35 mm pitch, recorded simultaneously by two Avantes AvaSpec spectrometers stored under their serial numbers: 2101075U1 (NIR, 512 px, 894–1692 nm) and 2012190U1 (UV/VIS, 2048 px, 176–1334 nm). The paper's analysis uses the NIR channel over 1150–1350 nm. Per scan: spectrum (raw counts), wavelength (in metres), position_x/position_y and their target values (mm), timestamp (Unix epoch, s) and a per-pixel saturated flag. Acquisition settings are stored as attributes on the scan_1 group. Each sample was scanned twice per the spectroscopic liquid infiltration method: once in ambient air (*_cleaned / *_2xcleaned) and once infiltrated with ethanol (*_EtOH), to decouple layer thickness from porosity. Sample-to-cell mapping: A = 1851251014, B = 1841251008, C = 1831251008. 1741250707_pSi_(1)_reference&dark.h5 contains the dark spectrum used to dark-correct every area scan. Each scan was normalised by the spectrum of an unetched bulk-silicon point within the same scan (see README).Data Type: Experimental Data ; Data Type: Simulation Data47 100 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Synchrotron SAXS, WAXS and XRF -derived structural and compositional descriptors of palm leaves and palm-leaf manuscripts and statistical analysis(2026-09-07)This dataset contains analysis-ready and derived data from SAXS, WAXS, and XRF measurements of palm-leaf reference materials and manuscripts. It includes analysis code, Jupyter notebooks, derived descriptor tables, fit parameters, representative fit plots, and the corrected and integrated scattering data required to reproduce the analyses presented in the associated thesis and articles. The raw and facility-corrected integrated synchrotron data for Samples 0–3 are archived separately by the respective facilities: * Sample 0: DESY, beamline P62, 2024, DOI: [10.60883/E007EE79FB] * Samples 1 and 2: ESRF, beamline BM02, 2024, DOI: [10.15151/ESRF-ES-1520005738] * Sample 3: DESY, beamline P62, 2025, DOI: [10.60883/410671131A] These sample numbers correspond to the naming convention used throughout the analysis code and notebooks. The analysis scripts and notebooks were developed as a common workflow and are adapted across the different measurement campaigns. Structure of the data ├── README.txt ├── samples_metadata.xlsx ├── code/ ├── sample_0/ ├── sample_1-2/ ├── sample_3/ -- `samples_metadata.xlsx` Contains metadata for all palm-leaf reference materials and manuscript samples employed across the different beamtime campaigns. -- `code/` Contains the Python scripts and Jupyter notebooks used for data processing, fitting, descriptor extraction, visualization, and statistical analysis. The workflows were developed jointly for the different measurement campaigns and may require minor path adjustments or switching commented/uncommented sections before reuse. -- `sample_X/` Each `sample_X` folder corresponds to the sample-number convention used in the analysis code and notebooks. The folders contain, where applicable: sample_X/ ├── measurement_list_sampleX.xlsx ├── scan_areas.pdf ├── coordinates/ ├── xrf_maps/ ├── WAXS/ └── SAXS/ -- `measurement_list_sampleX.xlsx` Contains the measurement names, assigned scan numbers, sample identifiers, and sample–detector angle (\alpha). -- scan_areas.pdf Contains photos of the objects and indications of rough position of the scans -- coordinates/ Contains text files assigning each measured pixel to one of the following classes: * `None`: empty beam path or sample holder; * `0`: measurement on sample material without inscription; * `1`: measurement on an inscription area. -- xrf_maps/ -- config files for pyMCA (.cfg) -- pyMCA_maps/ Contains concentration-like elemental maps calculated with pyMCA -- WAXS/ -- example_plots/ contains example WAXS-intengrated scan-averaged fits -- few specific folders with point by point fits and descriptor values -- txt amorphous contribution descriptor WAXS-intengrated scan-averaged: amorphous_contribution.txt -- txt crystallinity descriptors WAXS-integrated, scan-average: av_crystallinity_descriptors.txt -- txt crystallinity fit parameters WAXS-integrated, scan-average: av_crystallinity_fits.txt Contains text files with scan-averaged WAXS fits and extracted descriptors. For selected scans, additional subfolders contain point-by-point analysis results across the scanned area. -- `SAXS/` -- example_plots/ contains example SAXS azimuthaly-intengrated scan-averaged fits -- txt fits and descriptors of SAXS azimuthaly-intengrated scan-averaged over 'inked' regions: orientation_probability_sampleX_ink.txt -- txt fits and descriptors of SAXS azimuthaly-intengrated scan-averaged over 'uninked' regions: orientation_probability_sampleX_unink.txt Used equipment: SASMAT setup at P62 beamline at PETRA III, as well as the setup at the BM02 beamline at the ESRF, both of them with the addition of XRF detectors.Data Type: Dataset16 6 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Deformation Dynamics of Nanopores upon Water imbibition: Optical, Gravimetric and Dilatometry experiments.(2024-08-26)The datasets included in this work focus on the study of the imbibition dynamics of water in nanoporous Vycor glass. Specifically, this refers to the filling dynamics of water, driven by capillary forces, into a hydrophilic nanoporous Vycor glass sample (porous silica glass). The samples (2) used in these experiments are cylindrical monoliths. Both are identical (mean pore size , porosity), differing only in length. The experiments were designed to study capillary rise dynamics. Since Vycor glass is translucent, this can be directly observed by tracking the filling front via changes in the transparency of the samples (optical experiments). It can also be indirectly monitored by measuring properties of the sample that change proportionally to the filling front length. For this, we performed mass uptake experiments, measuring the changes in the mass of the sample during filling. We also used a high-precision dilatometer to measure changes in the length of the sample (strain) during imbibition (dilatometry).Data Type: Experimental Data61 158 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , An Electrochemical Impedance Spectroscopy Study of Mesoporous Silicon in Aqueous Electrolyte Solution(2024-03-04); The dataset presented here belong to an electrochemical impedance spectroscopy (EIS) study of mesoporous silicon in aqueous electrolyte solution (perchloric acid). The dataset contains EIS measurements performed at various static applied potentials so that a Mott-Schottky analysis of the electrode can be performed. Moreover, the dataset has an EIS study on a bulk silicon electrode, synthesized under equal conditions as the porous silicon electrode, so that a direect comparison between the two electrode types is possible.Data Type: Experimental Data147 109 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Wafer-scale fabrication of mesoporous silicon functionalized with electrically conductive polymers(2024-01-16); ; ; ; Dataset that contains different data on electrochemical and x-ray diffraction experiments of the synthesis and structure investigations of hybrid materials made out of conductive polymers and porous silicon. The mesoporous silicon epilayers are filled electrochemically with the polymers polypyrrole and poly-3,4-ethylendioxythiophen. Polyaniline could only be deposited on top of the porous silicon and not inside the mesopores. If applicable, the galvanostatic raw datasets have to normalized by the epilayer surface area of 7.89cm². The x-ray diffraction data contains both powder diffraction data sets (counts vs. 2-theta) and 2D detector images (P08 DESY synchrotron, 25 keV) of the monomer 2,5-Dibromo-3,4-ethylenedioxythiophene and the polymer poly-3,4-ethylendioxythiophen after solid state polymerization at 60°C. The samples investigated at the synchrotron (2D datasets) are hybrid materials in which the mesoporous pore space of the silicon is filled via spontaneous imbibition of the DBEDOT and subsequently polymerized to PEDOT. Each 2D image is taken at a different z position in order to mitigate beam damage.Data Type: Experimental Data77 511 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , How Nanoporous Silicon-Polypyrrole Hybrids Flex Their Muscles in Aqueous Electrolytes: In Operando High-Resolution X-Ray Diffraction and Electron Tomography-Based Micromechanical Computer Simulations(2022-10-28); ; ; ; Dataset that contains different data on an in situ, combined electrochemical and x-ray diffraction investigation of the electrochemical actuation of a polypyrrole-filled porous silicon hybrid material. The pores of nanoporous silicon are filled by the electroactive polymer polypyrrole. An applied potential to the hybrid material immersed in an electrolyte solution leads to an incorporation of ions into the polymer and an expansion of the whole hybrid material. This electrochemical actuation is investigated by x-ray diffraction experiments, in which the lattice constant of the highly mono-crystalline porous silicon host material is studied with respect to the actuation. The dataset contains the electrochemical and the x-ray datasets. Moreover, a transmission electron microscopy tomography is performed on the polypyrrole-porous silicon hybrid material to obtain a three-dimensional model. This tomography reconstruction is included in the dataset. It can be transformed into an FEM model so that the actuation-induced strains and stresses in the complex porous silicon host structure can be studied and compared to the experimentally gained insights.Data Type: Dataset169 182 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Wafer-Scale Fabrication of Hierarchically Porous Silicon and Silica by Active Nanoparticle-Assisted Chemical Etching and Pseudomorphic Thermal OxidationDataset containing analysis on a hierarchical porous silicon structure. The structure consists of 1µm macropores hexagonally arranged and interconnected by mesopores in the range of 60nm. Included are a scanning electron micrograph of an overview of the macroporous structure which can be analysed to obtain structural properties such as the pore diameter, surface roughness, surface area and pore volume. Also included are reconstructed transmission electron microscopy and transmission x-ray microscopy tomography data to analyse the same structural parameters on smaller and larger length scale, respectively.Data Type: Dataset483 266 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Multiple glassy dynamics of a homologous series of triphenylene-based columnar liquid crystals – A study by broadband dielectric spectroscopy and advanced calorimetry(2022-01-17); ; ; Hexakis(n-alkyloxy)triphenylene) (HATn) consisting of an aromatic triphenylene core and alkyl side chains are model discotic liquid crystal (DLC) systems forming a columnar mesophase where the molecules of HATn self-assemble and stack up in columns exhibiting one-dimensional high charge carrier mobility along the column axes. Here, a homologous series of HATn with different length of the alkyl chain (n=5,6,8,10,12) is investigated using differential scanning calorimetry (DSC), broadband dielectric spectroscopy (BDS) and advanced calorimetric techniques including fast scanning calorimetry (FSC) and specific heat spectroscopy (SHS). The phase behavior was studied by DSC and the influence of the alkyl chain length on the phase behavior was revealed. By the dielectric investigations probing the molecular mobility, a γ-relaxation due to localized fluctuations as well as two glassy dynamics the αcore and αalkyl relaxation were observed in the temperature range of the plastic crystalline phase. Moreover, the observed glassy dynamics were further studied employing advanced calorimetry. Possible molecular assignments for all observed relaxation processes are proposed and discussed in detail. From the results a transition at around n=8 from a rigid constrained (n=5,6) to a softer system (n=10,12) was revealed with increasing alkyl chain length. A counterbalance of two competing effects of a polyethylene like behavior of the alkyl chains in the intercolumnar domains and self-organized confinement is discussed in the context of a hindered glass transition.Data Type: Dataset209 156 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Wafer‐Scale Electroactive Nanoporous Silicon: Large and Fully Reversible Electrochemo‐Mechanical Actuation in Aqueous Electrolytes(2021-09-27); Data for the publication "Wafer‐Scale Electroactive Nanoporous Silicon: Large and Fully Reversible Electrochemo‐Mechanical Actuation in Aqueous Electrolytes" as well as a detailed description of the datasets.Data Type: Dataset207 301 - Some of the metrics are blocked by yourconsent settings
Item type:Research Data, Access status: with files , Laser-Excited Elastic Guided Waves Reveal the Complex Mechanics of Nanoporous Silicon(2020-12-11); ; ; ; Nanoporosity in silicon leads to completely new functionalities of this mainstream semiconductor. A difficult to assess mechanics has however significantly limited its application in fields ranging from nanofluidics and biosensorics to drug delivery and energy storage. Here, we present a study on laser-excited elastic guided waves detected contactless and non-destructively in dry and liquid-infused single-crystalline porous silicon.These experiments reveal that the selforganised formation of 100 billions of parallel nanopores per squarecentimetre crosssection results in a nearly isotropic elasticity perpendicular to the pore axes and an 80% stiffnessreduction in the material, despite a bulk-like and anisotropic porewall elasticity. Our thorough assessment of the wafer-scale mechanics of nanoporous silicon provides the base for predictive applications in robust on-chip devices and evidences that recent breakthroughs in laser ultrasonics open up entirely new frontiers for in-situ, non-destructive mechanical characterisation of dry and liquid-functionalised porous materials. Here saved are raw and processed data of laser ultrasonics measurements of porous and bulk silicon.Data Type: Dataset280 305