Search results for: Steffen Oswald

Items from 1 to 20 out of 56 results

article

Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties

Josephine Zeisig, Lars Giebeler, Annett Gebert, Steffen Oswald, more

Advanced Engineering Materials > 24 > 9 > n/a - n/a

This work presents the novel high‐strength cast steels Fe81Cr15Mo1V2C1 and Fe80Cr15Mo1V3C1 (wt%) with high resistance against abrasion and acid corrosion. By means of a tailored alloy design and a special casting technique, implying high solidification rates, multiphase microstructures composed of martensite, austenite and a complex arranged carbidic network are formed. The increase of the vanadium...

article

Bone Formation: Rolled‐Up Metal Oxide Microscaffolds to Study Early Bone Formation at Single Cell Resolution (Small 12/2021)

Raffael Herzer, Annett Gebert, Ute Hempel, Franziska Hebenstreit, more

Small > 17 > 12 > n/a - n/a

Transparent Ti‐45Nb 3D microstructures offer an elegant way to study single bone cell‐implant material interactions and pore size effects in vitro. In article number 2005527, Mariana Medina‐Sánchez and co‐workers present this technology as an excellent tool to live monitor cell migration and adhesion behavior changes deriving from highly constricted microenvironments, while also providing deeper insights...

article

Rolled‐Up Metal Oxide Microscaffolds to Study Early Bone Formation at Single Cell Resolution

Raffael Herzer, Annett Gebert, Ute Hempel, Franziska Hebenstreit, more

Small > 17 > 12 > n/a - n/a

Titanium and its alloys are frequently used to replace structural components of the human body due to their high mechanical strength, low stiffness, and biocompatibility. In particular, the use of porous materials has improved implant stabilization and the promotion of bone. However, it remains unclear which material properties and geometrical cues are optimal for a proper osteoinduction and osseointegration...

article

XPS chemical state analysis of sputter depth profiling measurements for annealed TiAl‐SiO₂ and TiAl‐W layer stacks

Steffen Oswald, Eric Lattner, Marietta Seifert

Surface and Interface Analysis > 52 > 12 > 924 - 928

For the application of surface acoustic wave sensors at high temperatures, both a high‐temperature stable piezoelectric substrate and a suitable metallization for the electrodes are needed. Our current attempt is to use TiAl thin films as metallization because this material is also known to be high temperature stable. In this study, Ti/Al multilayers and Ti‐Al alloy layers were prepared in combination...

article

The 18th European Conference on Applications of Surface and Interface Analysis

Steffen Oswald, John F. Watts, Marie‐Laure Abel

Surface and Interface Analysis > 52 > 12 > 785 - 785

article

A High‐Voltage, Dendrite‐Free, and Durable Zn–Graphite Battery

Gang Wang, Benjamin Kohn, Ulrich Scheler, Faxing Wang, more

Advanced Materials > 32 > 4 > n/a - n/a

The intrinsic advantages of metallic Zn, like high theoretical capacity (820 mAh g⁻¹), high abundance, low toxicity, and high safety have driven the recent booming development of rechargeable Zn batteries. However, the lack of high‐voltage electrolyte and cathode materials restricts the cell voltage mostly to below 2 V. Moreover, dendrite formation and the poor rechargeability of the Zn anode hinder...

article

Beyond Activated Carbon: Graphite‐Cathode‐Derived Li‐Ion Pseudocapacitors with High Energy and High Power Densities

Gang Wang, Steffen Oswald, Markus Löffler, Klaus Müllen, more

Advanced Materials > 31 > 14 > n/a - n/a

Supercapacitors have aroused considerable attention due to their high power capability, which enables charge storage/output in minutes or even seconds. However, to achieve a high energy density in a supercapacitor has been a long‐standing challenge. Here, graphite is reported as a high‐energy alternative to the frequently used activated carbon (AC) cathode for supercapacitor application due to its...

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Metal release and cell biological compatibility of beta‐type Ti‐40Nb containing indium

Stefan Pilz, Annett Gebert, Andrea Voss, Steffen Oswald, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 106 > 5 > 1686 - 1697

Small indium (In) additions up to 5 wt % to the beta‐type Ti‐40Nb alloy effectively improve its mechanical biofunctionality. The impact on its biocompatibility is addressed in this work. Comparative electrochemical polarization studies and inductively coupled plasma optical emission spectrometry analyses were conducted in Tris‐buffered saline (on the basis of 150 mM NaCl) with pH 7.6 and 2.0 at 310...

article

Electrodeposition of manganese layers from sustainable sulfate based electrolytes

Mónica Fernández-Barcia, Volker Hoffmann, Steffen Oswald, Lars Giebeler, more

Surface and Coatings Technology > 2018 > 334 > C > 261-268

Functional manganese-(Mn)-containing layers are becoming increasingly important in the fields of sacrificial corrosion protection, biodegradable medical devices or electrochemical energy conversion systems. Electrodeposition can be a low cost and time-efficient production route, but the very electronegative nature of Mn makes this reduction process quite challenging.In this paper, electrolytic potentiostatic...

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A combined experimental and theoretical investigation of the Al-Melamine reactive milling system: A mechanistic study towards AlN-based ceramics

Seyyed Amin Rounaghi, Danny E.P. Vanpoucke, Hossein Eshghi, Sergio Scudino, more

Journal of Alloys and Compounds > 2017 > 729 > C > 240-248

A versatile ball milling process was employed for the synthesis of hexagonal aluminum nitride (h-AlN) through the reaction of metallic aluminum with melamine. A combined experimental and theoretical study was carried out to evaluate the synthesized products. Milling intermediates and products were fully characterized via various techniques including XRD, FTIR, XPS, Raman and TEM. Moreover, a Boltzmann...

article

Chemiresistive biosensors based on carbon nanotubes for label-free detection of DNA sequences derived from avian influenza virus H5N1

Yangxi Fu, Victor Romay, Ye Liu, Bergoi Ibarlucea, more

Sensors and Actuators B: Chemical > 2017 > 249 > C > 691-699

We developed chemiresistor-type biosensors based on carbon nanotubes for highly efficient and fast detection of avian influenza virus (AIV) subtype H5N1 DNA sequences. Semiconducting single-walled carbon nanotubes (sc-SWCNTs) or nitrogen-doped multi-walled carbon nanotubes (N-MWCNTs) were used as two alternative active sensing elements, and their sensitivity to different concentrations of DNA target...

article

Ultra-thin all-solid-state micro-supercapacitors with exceptional performance and device flexibility

Theresia Göhlert, Pablo F. Siles, Tom Päßler, Robert Sommer, more

Nano Energy > 2017 > 33 > C > 387-392

Relying on the combination of lithium phosphorous oxynitride (LiPON) as electrolyte and cobalt oxide (Co₃O₄) as electrode material it is possible to fabricate symmetric all-solid-state micro-supercapacitors (ASTSCaps) on rigid and flexible substrates. Due to the nanoscale active layer dimensions, the excellent performance of the component materials and the high nominal voltage of 2V, an exceptionally...

article

Charge Transfer and Structural Anomaly in Stoichiometric Layered Perovskite Sr₂Co_0.5Ir_0.5O₄

Daria Mikhailova, Zhiwei Hu, Chang‐Yang Kuo, Steffen Oswald, more

European Journal of Inorganic Chemistry > 2017 > 3 > 587 - 595

A layered Sr₂Co_0.5Ir_0.5O₄ (space group I4/mmm) perovskite of the K₂NiF₄ structure type was synthesized as a single‐phase sample. Neutron powder diffraction measurements revealed full site occupancy of oxygen atoms. The Co³⁺/Ir⁵⁺ valence states were evaluated by a combination of X‐ray absorption and X‐ray photoemission spectroscopy as well as by magnetization measurements, and thus the differences...

article

Hierarchically porous Pd/NiO nanomembranes as cathode catalysts in Li-O2 batteries

Xueyi Lu, Yin Yin, Long Zhang, Lixia Xi, more

Nano Energy > 2016 > 30 > C > 69-76

Exploring highly efficient electrocatalysts is crucial for aprotic Li-O₂ batteries. Pd/NiO nanomembranes with hierarchical pores are fabricated and employed as cathode catalysts in Li-O₂ batteries. By means of standard photolithography, ordered macropores were prepared in the nanomembranes. Moreover, we developed a facile template-free method to create nanopores with sizes ranging from 50 to 200nm...

article

Effect of Carbon‐Based Materials on the Early Hydration of Tricalcium Silicate

Anastasia Sobolkina, Viktor Mechtcherine, Sebastian T. Bergold, Jürgen Neubauer, more

Journal of the American Ceramic Society > 99 > 6 > 2181 - 2196

Two types of carbon‐based materials, i.e., mesoporous carbon and HNO₃‐oxidized carbon nanotubes, with nearly the same specific surface area and abundant in surface oxygen‐containing functional groups were selected in order to examine their effect on the hydration of tricalcium silicate (C₃S), the main portland cement component, in early stages. Different methods, including XPS and TG‐MS analyses,...

article

Fragmentation characteristics of undoped and nitrogen-doped multiwalled carbon nanotubes in aqueous dispersion in dependence on the ultrasonication parameters

Robert Fuge, Marco Liebscher, Christof Schröfl, Steffen Oswald, more

Diamond and Related Materials > 2016 > 66 > C > 126-134

Sonication techniques are commonly used to disagglomerate carbon nanotube bundles into more or less uniformly distributed individual tubes. The present study discusses the statistical length distribution of multiwalled carbon nanotubes (MWCNTs) as affected by varied sonication time, sonication amplitude and overall energy input applied. Undoped and nitrogen-doped multiwall carbon nanotubes (N-MWCNTs)...

article

Partially and fully de-alloyed glassy ribbons based on Au: Application in methanol electro-oxidation studies

Eirini Maria Paschalidou, Federico Scaglione, Annett Gebert, Steffen Oswald, more

Journal of Alloys and Compounds > 2016 > 667 > C > 302-309

In this work, electrochemical de-alloying of an amorphous alloy, Au₄₀Cu₂₈Ag₇Pd₅Si₂₀, cast in ribbon form by melt spinning, has been performed, obtaining self standing nanoporous materials suitable for use as electrodes for electrocatalytic applications. The de-alloying encompasses removal of less noble elements and the crystallization of Au, resulting in interconnected ligaments whose size and morphology...

article

Material-related effects during ion beam treatment by an end-Hall ion source

Erik Brachmann, Siegfried Menzel, Steffen Oswald, Andreas Winkler

Vacuum > 2016 > 124 > C > 65-71

Reproducibility and accuracy of dry etching processes are a challenge for the operators of end-Hall ion sources with hot filament (HF) neutralizer. The variation of the neutralization current I_N, e.g. due to filament aging as well as the properties of the substrate material lead to changes in the resulting etch rate of the substrate. Therefore a special controller setup was developed to automatically...

article

Improved cycling stability of lithium–sulfur batteries using a polypropylene-supported nitrogen-doped mesoporous carbon hybrid separator as polysulfide adsorbent

Juan Balach, Tony Jaumann, Markus Klose, Steffen Oswald, more

Journal of Power Sources > 2016 > 303 > C > 317-324

The lithium/sulfur couple is garnering tremendous interest as the next-generation of cost-efficient rechargeable battery systems capable to fulfill emerging energy storage demands. However, the viable commercialization of lithium–sulfur (Li–S) batteries is still an obstacle by fast capacity fading and poor cycling stability mostly caused by the polysulfide shuttle and active sulfur material loss....

article

Designing new biocompatible glass‐forming Ti_75‐_xZr₁₀Nb_xSi₁₅ (x = 0, 15) alloys: corrosion, passivity, and apatite formation

Somayeh Abdi, Steffen Oswald, Petre Flaviu Gostin, Arne Helth, more

Journal of Biomedical Materials Research Part B: Applied Biomaterials > 104 > 1 > 27 - 38

Glass‐forming Ti‐based alloys are considered as potential new materials for implant applications. Ti₇₅Zr₁₀Si₁₅ and Ti₆₀Zr₁₀Nb₁₅Si₁₅ alloys (free of cytotoxic elements) can be produced as melt‐spun ribbons with glassy matrix and embedded single β‐type nanocrystals. The corrosion and passivation behavior of these alloys in their homogenized melt‐spun states have been investigated in Ringer solution...

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INFONA - science communication portal

Search results for: Steffen Oswald

Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties

Bone Formation: Rolled‐Up Metal Oxide Microscaffolds to Study Early Bone Formation at Single Cell Resolution (Small 12/2021)

Rolled‐Up Metal Oxide Microscaffolds to Study Early Bone Formation at Single Cell Resolution

XPS chemical state analysis of sputter depth profiling measurements for annealed TiAl‐SiO₂ and TiAl‐W layer stacks

The 18th European Conference on Applications of Surface and Interface Analysis

A High‐Voltage, Dendrite‐Free, and Durable Zn–Graphite Battery

Beyond Activated Carbon: Graphite‐Cathode‐Derived Li‐Ion Pseudocapacitors with High Energy and High Power Densities

Metal release and cell biological compatibility of beta‐type Ti‐40Nb containing indium

Electrodeposition of manganese layers from sustainable sulfate based electrolytes

A combined experimental and theoretical investigation of the Al-Melamine reactive milling system: A mechanistic study towards AlN-based ceramics

Chemiresistive biosensors based on carbon nanotubes for label-free detection of DNA sequences derived from avian influenza virus H5N1

Ultra-thin all-solid-state micro-supercapacitors with exceptional performance and device flexibility

Charge Transfer and Structural Anomaly in Stoichiometric Layered Perovskite Sr₂Co_0.5Ir_0.5O₄

Hierarchically porous Pd/NiO nanomembranes as cathode catalysts in Li-O2 batteries

Effect of Carbon‐Based Materials on the Early Hydration of Tricalcium Silicate

Fragmentation characteristics of undoped and nitrogen-doped multiwalled carbon nanotubes in aqueous dispersion in dependence on the ultrasonication parameters

Partially and fully de-alloyed glassy ribbons based on Au: Application in methanol electro-oxidation studies

Material-related effects during ion beam treatment by an end-Hall ion source

Improved cycling stability of lithium–sulfur batteries using a polypropylene-supported nitrogen-doped mesoporous carbon hybrid separator as polysulfide adsorbent

Designing new biocompatible glass‐forming Ti_75‐_xZr₁₀Nb_xSi₁₅ (x = 0, 15) alloys: corrosion, passivity, and apatite formation

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