N. Kunka
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View article: SHI: A Framework for Spatial Harmonic Imaging
SHI: A Framework for Spatial Harmonic Imaging Open
Despite the growing interest in multicontrast X-ray imaging, \textit{spatial harmonic imaging} remains limited by a lack of specialized computational resources. In this paper, we present \textit{SHI}, a high-performance software framework …
View article: Polypy: A Framework to Interpret Polymer Properties from Mass Spectrometry Data
Polypy: A Framework to Interpret Polymer Properties from Mass Spectrometry Data Open
Mass spectroscopy (MS) is a robust technique for polymer characterization, and it can provide the chemical fingerprint of a complete sample regarding polymer distribution chains. Nevertheless, polymer chemical properties such as polydisper…
View article: Micro-reinforced polymer composite materials studied by correlative X-ray imaging
Micro-reinforced polymer composite materials studied by correlative X-ray imaging Open
Three-dimensional insights into the microstructure of composite materials are vital for enhancing their performance under operational conditions. Phase-sensitive methods can offer supplementary data, especially for materials with low absor…
View article: Trajectory analysis through entropy characterization over coded representation
Trajectory analysis through entropy characterization over coded representation Open
Any continuous curve in a higher dimensional space can be considered a trajectory that can be parameterized by a single variable, usually taken as time. It is well known that a continuous curve can have a fractional dimensionality, which c…
View article: Bulk morphology of porous materials at submicrometer scale studied by dark-field x-ray imaging with Hartmann masks
Bulk morphology of porous materials at submicrometer scale studied by dark-field x-ray imaging with Hartmann masks Open
We present the quantitative investigation of the submicron structure in the bulk of porous graphite by using the dark-field x-ray imaging with Hartmann masks. By scanning the correlation length and measuring the mask visibility reduction, …
View article: Aerosol Jet Printing of 3D Pillar Arrays from Photopolymer Ink
Aerosol Jet Printing of 3D Pillar Arrays from Photopolymer Ink Open
An aerosol jet printing (AJP) printing head built on top of precise motion systems can provide positioning deviation down to 3 μm, printing areas as large as 20 cm × 20 cm × 30 cm, and five-axis freedom of movement. Typical uses of AJP are…
View article: Oligocat: Oligoesters as Pseudo-Homogenous Catalysts for Biodiesel Synthesis
Oligocat: Oligoesters as Pseudo-Homogenous Catalysts for Biodiesel Synthesis Open
Biodiesel production from first-generation feedstock has shown a strong correlation with the increase in deforestation and the necessity of larger areas for land farming. Recent estimation from the European Federation for Transport and Env…
View article: Inverted Hartmann mask made by deep X-ray lithography for single-shot multi-contrast X-ray imaging with laboratory setup
Inverted Hartmann mask made by deep X-ray lithography for single-shot multi-contrast X-ray imaging with laboratory setup Open
This paper reports on the fabrication and characterization of an inverted Hartmann mask and its application for multi-contrast X-ray imaging of polymer composite material in a laboratory setup. Hartmann masks open new possibilities for hig…
View article: Synthesis and Chemical Functionalization of Pseudo-Homogeneous Catalysts for Biodiesel Production—Oligocat
Synthesis and Chemical Functionalization of Pseudo-Homogeneous Catalysts for Biodiesel Production—Oligocat Open
With the increase in global demand for biodiesel, first generation feedstock has drawn the attention of governmental institutions due to the correlation with large land farming areas. The second and third feedstock generations are greener …
View article: Single-Shot Multicontrast X-ray Imaging for In Situ Visualization of Chemical Reaction Products
Single-Shot Multicontrast X-ray Imaging for In Situ Visualization of Chemical Reaction Products Open
We present the application of single-shot multicontrast X-ray imaging with an inverted Hartmann mask to the time-resolved in situ visualization of chemical reaction products. The real-time monitoring of an illustrative chemical reaction in…
View article: Self‐healing triggering mechanism in epoxy‐based material containing microencapsulated amino‐polysiloxane
Self‐healing triggering mechanism in epoxy‐based material containing microencapsulated amino‐polysiloxane Open
This work combines non‐destructive X‐ray micro‐computed tomography (µCT) and scanning electron microscopy (SEM) to study the self‐healing triggering mechanism in a system consisting of an epoxy resin, based on diglycidyl ether of bisphenol…
View article: Lithographic Performance of Aryl Epoxy Thermoset Resins as Negative Tone Photoresist for Microlithography
Lithographic Performance of Aryl Epoxy Thermoset Resins as Negative Tone Photoresist for Microlithography Open
Photoresists (or photo-resins) are the main and most important raw material used for lithography techniques such as deep X-ray (DXRL), ultraviolet (UVL), deep-UV (DUVL), and extreme UV (EUVL). In previous work, we showed how complicated co…
View article: Shack–Hartmann wavefront sensors based on 2D refractive lens arrays and super-resolution multi-contrast X-ray imaging
Shack–Hartmann wavefront sensors based on 2D refractive lens arrays and super-resolution multi-contrast X-ray imaging Open
Different approaches of 2D lens arrays as Shack–Hartmann sensors for hard X-rays are compared. For the first time, a combination of Shack–Hartmann sensors for hard X-rays (SHSX) with a super-resolution imaging approach to perform multi-con…
View article: Suppression of Penning discharges between the KATRIN spectrometers
Suppression of Penning discharges between the KATRIN spectrometers Open
The KArlsruhe TRItium Neutrino experiment (KATRIN) aims to determine the effective electron (anti)-neutrino mass with a sensitivity of 0.2eV/c$^{2}$ by precisely measuring the endpoint region of the tritium β-decay spectrum. It uses a tand…
View article: Epoxy Resins for Negative Tone Photoresists
Epoxy Resins for Negative Tone Photoresists Open
One of the types of negative tone photoresists is composed of at least a catalyst, a solvent, and epoxy resin. This is the primary raw material for lithography technology. To ensure high-quality pattern transfer in the lithography process,…
View article: A Shack-Hartmann Sensor for Single-Shot Multi-Contrast Imaging with Hard X-rays
A Shack-Hartmann Sensor for Single-Shot Multi-Contrast Imaging with Hard X-rays Open
An array of compound refractive X-ray lenses (CRL) with 20 × 20 lenslets, a focal distance of 20cm and a visibility of 0.93 is presented. It can be used as a Shack-Hartmann sensor for hard X-rays (SHARX) for wavefront sensing and permits f…
View article: A Shack-Hartmann Sensor for Single-Shot Multi-Contrast Imaging with Hard X-rays
A Shack-Hartmann Sensor for Single-Shot Multi-Contrast Imaging with Hard X-rays Open
An array of compound refractive X-ray lenses (CRL) with 20 × 20 lenslets, a focal distance of 20cm and a visibility of 0.93 is presented. It can be used as a Shack-Hartmann sensor for hard X-rays (SHARX) for wavefront sensing and permits f…
View article: Chemical and Molecular Variations in Commercial Epoxide Photoresists for X-ray Lithography
Chemical and Molecular Variations in Commercial Epoxide Photoresists for X-ray Lithography Open
The quality of high aspect ratio microstructures fabricated by deep X-ray lithography is highly dependent on the photoresist material used and the process parameters applied. Even with photoresists more suitable to this process, it is comm…
View article: Development and Characterization of Two-Dimensional Gratings for Single-Shot X-ray Phase-Contrast Imaging
Development and Characterization of Two-Dimensional Gratings for Single-Shot X-ray Phase-Contrast Imaging Open
Single-shot grating-based phase-contrast imaging techniques offer additional contrast modalities based on the refraction and scattering of X-rays in a robust and versatile configuration. The utilization of a single optical element is possi…
View article: A Shack-Hartmann sensor for single-shot multi-contrast imaging with hard X-rays
A Shack-Hartmann sensor for single-shot multi-contrast imaging with hard X-rays Open
An array of compound refractive X-ray lenses (CRL) with 20x20 lenslets, a focal distance of 20 cm and a visibility of 0.93 is presented. It can be used as a Shack-Hartmann sensor for hard X-rays (SHARX) for wavefront sensing and permits fo…
View article: Quantitative characterization of X-ray lenses from two fabrication techniques with grating interferometry
Quantitative characterization of X-ray lenses from two fabrication techniques with grating interferometry Open
Refractive X-ray lenses are in use at a large number of synchrotron experiments. Several materials and fabrication techniques are available for their production, each having their own strengths and drawbacks. We present a grating interfero…
View article: Height control for small periodic structures using x-ray radiography
Height control for small periodic structures using x-ray radiography Open
We report on a method to characterize the height of periodic x-ray absorbing structures.Such structures are used for example in grating-based x-ray interferometry.In contrast to other techniques, our approach allows for a non-destructive d…