A5002093012- Supercapacitor Materials and Fabrication
- Electrospun Nanofibers in Biomedical Applications
- Magnetic properties of thin films
- Additive Manufacturing and 3D Printing Technologies
- Advanced Sensor and Energy Harvesting Materials
- Fiber-reinforced polymer composites
- Building materials and conservation
- Graphene research and applications
- Surface Modification and Superhydrophobicity
- Magnetic Properties and Applications
- Theoretical and Computational Physics
- Magnetic and transport properties of perovskites and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Biosensors and Analytical Detection
- Conducting polymers and applications
- Silicone and Siloxane Chemistry
- Magneto-Optical Properties and Applications
- Textile materials and evaluations
- SARS-CoV-2 detection and testing
- SARS-CoV-2 and COVID-19 Research
- Injection Molding Process and Properties
- Polymer composites and self-healing
- Thermochemical Biomass Conversion Processes
- Electrochemical Analysis and Applications
- Advancements in Battery Materials
Bielefeld University
2021-2025
Hochschule Bielefeld
2017-2025
Ruhr University Bochum
2013
Fused deposition modeling (FDM) is a three-dimensional (3D) printing technology that usually performed with polymers are molten in printer nozzle and placed line by on the bed or previous layer, respectively. Nowadays, hybrid materials combining functional also commercially available. Especially combinations of metal particles result printed objects interesting optical mechanical properties. The properties two these metal-polymer blends were compared to common poly (lactide acid) (PLA)...
We developed a formulation of long double-stranded RNA (dsRNA) using interpolyelectrolyte complexes (IPECs) composed the biopolymers chitosan and alginate, in order to protect dsRNA from biotic abiotic factors. Our primary objectives were enhance stability against environmental nucleases and, secondarily, mitigate negative charge dsRNA, which may promote foliar uptake. approach relies on submicron particles with adjustable surface being either positive or negative. Following this approach,...
3D printing is a technology which has recently found its way into the fi eld of textile fabrics, from fashion design to technical textiles.By combining both technologies with their advantages, new composites novel physical properties can be created.Increasing adhesion between components, however, still remains challenging.This paper suggests method improve printed object on fabric by previously coating latter polymer layer.In this way, substantially enhanced without signifi cantly changing...
Electrospinning is a new technology whose scope gradually being developed. For this reason, the number of known polymer⁻solvent combinations for electrospinning still very low despite enormous variety substances that are potentially available. In particular, from low-toxic solvents, such as use dimethyl sulfoxide (DMSO) in medical technology, rare relevant scientific literature. Therefore, we present work series polymers applicable DMSO. From wide range synthetic tested, poly(vinyl alcohol)...
Electrospinning is a frequently used method to prepare air and water filters. Electrospun nanofiber mats can have very small pores, allowing for filtering of even the smallest particles or molecules. In addition, their high surface-to-volume ratio allows integration materials which may additionally treat filtered material through photo-degradation, possess antimicrobial properties, etc., thus enhancing applicability. However, fine are prone mechanical damage. Possible solutions include...
Polyacrylonitrile can be used as a base material for thermochemical conversion into carbon. Especially nanofiber mats, produced by electrospinning, are of interest to create carbon nanofibers. Optimal stabilization and carbonization parameters, however, strongly depend on the spatial features original material. While differences between nano- microfibers well known, this paper shows that depending electrospinning method solvent used, considerable various mats have taken account optimization...
Hydrothermal carbonization of trehalose, in contrast to other saccharides, leads the formation microspheres with a bimodal size distribution. The develop hierarchical porosity micro-, meso-, and macro-pores after pyrolysis.
Abstract Precise control of pore size and surface properties is crucial for effective efficient membrane separation, yet it remains challenging with conventional polymer‐based membranes. In this study, gap addressed by integrating atomic layer deposition (ALD) Al 2 O 3 nanometer‐thin carbon nanomembranes (CNMs) to achieve ultra‐selective separation properties. Structural characterizations confirm uniform the preservation CNM structure. The ALD process allows precise modulation nanopore...
Abstract Highly magnified micrographs are part of the majority publications in materials science and related fields. They often basis for discussions far-reaching conclusions on nature specimen. In many cases, reviewers demand researchers deliver only bare minimum to substantiate research hypothesis at hand. this work, we use heterogeneous poly(acrylonitrile) nanofiber nonwovens with embedded nanoparticles demonstrate how an insufficient or biased micrograph selection may lead erroneous...
Thermally stabilized and subsequently carbonized nanofibers are a promising material for many technical applications in fields such as tissue engineering or energy storage. They can be obtained from variety of different polymer precursors via electrospinning. While some methods have been tested post-carbonization doping with the desired ingredients, very little is known about carbonization blend two more polymeric precursors. In this paper, we report on preparation, thermal treatment...
New ecological trends and changes in consumer behavior are known to favor biofilm formation household appliances, increasing the need for new antimicrobial materials surfaces. Their development requires laboratory-cultivated biofilms, or model systems (BMS), which allow accelerated growth offer better understanding of underlying mechanisms. Here, we identified bacterial strains wildtype biofilms from a variety domestic appliances using matrix-assisted laser desorption/ionization-time flight...
Helium ion microscopy (HIM) offers the opportunity to obtain direct views of biological samples such as cellular structures, virus particles, and microbial interactions. Imaging with HIM combines sub-nanometer resolution, large depth field, high surface sensitivity. Due its charge compensation capability, can image insulating without additional conductive coatings. Here, we present an exploratory study SARS-CoV-2 infected Vero E6 cells, in which several areas interaction between cells well...
Carbon nanofibers are used for a broad range of applications, from nano-composites to energy storage devices. They typically produced electrospun poly(acrylonitrile) by thermal stabilization and carbonization. The nanofiber mats usually placed freely movable in an oven, which leads relaxation internal stress within the nanofibers, making them thicker shorter. To preserve their pristine morphology they can be mechanically fixated, may cause break. In previous study, we demonstrated that...
Nanofibers are currently among the most researched nanomaterials in materials science. Various high-resolution microscopy techniques used for morphological investigations, with diameter as primary characteristic. Since methodological factors influencing distribution usually ignored, numerical values can hardly be compared across different or even within single studies. Here, we investigate such technique, degree of magnification, eventual coatings, and analysts' bias image selection...
Polyacrylonitrile (PAN) nanofibers, prepared by electrospinning, are often used as a precursor for carbon nanofibers. The thermal carbonization process necessitates preceding oxidative stabilization, which is usually performed thermally, i.e., carefully heating the electrospun nanofibers in an oven. One of typical problems occurring during this strong deformation fiber morphologies—the fibers become thicker and shorter, show partly undesired conglutinations. This problem can be solved...
Electrospun poly(acrylonitrile) (PAN) nanofibers are typical precursors of carbon nanofibers. During stabilization and carbonization, however, the morphology pristine PAN is not retained if as-spun nanofiber mats treated without an external mechanical force, since internal stress tends to relax, causing whole shrink significantly, while individual fibers thicken curl. Stretching during thermal treatment, in contrast, can result fractures due inhomogeneous stress. Previous studies have shown...
Electrospinning can be used to prepare nanofibers from various polymers and polymer blends. The adhesion of the substrates on which they are electrospun varies greatly with substrate material structure. In some cases, good is desired produce sandwich structures by electrospinning one directly onto another. This case, e.g., dye-sensitized solar cells (DSSCs). While both pure foil DSSCs have been examined, a combination technologies combine their advantages, lateral strength foils large...
Abstract The hysteresis loops of magnetic samples can be measured by the magneto‐optical Kerr effect (MOKE), while force microscopy (MFM) is used to depict domain walls or spatially resolved magnetization orientation in nanostructures thin films. Both methods are commonly applied on films with a perfectly flat surface nanostructures. Here, we report MOKE and MFM measurements new class materials, namely electrospun mats randomly oriented nanofibers which influence 30 nm Co coating layer,...
Electric field control of magnetic properties offers a broad and promising toolbox for enabling ultra-low power electronics. A key challenge with high technological relevance is to master the interplay between anisotropy ferromagnet exchange coupling an adjacent antiferromagnet. Here, we demonstrate that magneto-ionic gating can be used achieve very stable out-of-plane (OOP) oriented magnetization strong bias in samples as-deposited preferred in-plane (IP) magnetization. We show...
Electric field control of magnetic properties offers a broad and promising toolbox for enabling ultra-low power electronics. A key challenge with high technological relevance is to master the interplay between anisotropy ferromagnet exchange coupling an adjacent antiferromagnet. Here, we demonstrate that magneto-ionic gating can be used achieve very stable out-of-plane (OOP) oriented magnetization strong bias in samples as-deposited preferred in-plane (IP) magnetization. We show...
Abstract Understanding how water interacts with nanopores of carbonaceous electrodes is crucial for energy storage and conversion applications. A high surface area materials does not necessarily need to translate a electrolyte‐solid interface area. Herein, we study the interaction nanoporous C 1 N explain their very low specific capacitance in aqueous electrolytes despite Water was used probe chemical environments, provided by pores different sizes, H MAS NMR experiments. We observe that...