A5002725121- Advanced ceramic materials synthesis
- 2D Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Advanced Photocatalysis Techniques
- Bone Tissue Engineering Materials
- Covalent Organic Framework Applications
- Acoustic Wave Resonator Technologies
- Advanced MEMS and NEMS Technologies
- Advanced Thermoelectric Materials and Devices
- Nuclear materials and radiation effects
- Mechanical and Optical Resonators
- Advanced materials and composites
- Glass properties and applications
- Metal and Thin Film Mechanics
- Electronic and Structural Properties of Oxides
- Thermal properties of materials
- Conducting polymers and applications
- Intermetallics and Advanced Alloy Properties
- Titanium Alloys Microstructure and Properties
- Advancements in Battery Materials
- Microstructure and mechanical properties
- Carbon Nanotubes in Composites
- Thermal Radiation and Cooling Technologies
- Chalcogenide Semiconductor Thin Films
University of Vienna
2011-2021
Vienna Center for Quantum Science and Technology
2011
Microscale and nanoscale mechanical resonators have recently emerged as ubiquitous devices for use in advanced technological applications, example, mobile communications inertial sensors, novel tools fundamental scientific endeavours. Their performance is many cases limited by the deleterious effects of damping. In this study, we report a significant advancement towards understanding controlling support-induced losses generic resonators. We begin introducing an efficient numerical solver,...
Abstract Black phosphorus intercalation compounds (BPICs) with alkali metals (namely: K and Na) have been synthesized in bulk by solid‐state as well vapor‐phase reactions. By means of a combination situ X‐ray diffraction, Raman spectroscopy, DFT calculations the structural behavior BPICs at different stages has demonstrated for first time. Our results provide glimpse into very steps new family compounds, distinct compared to its graphite analogues (GICs), showing remarkable complexity...
The chemical bulk reductive covalent functionalization of thin-layer black phosphorus (BP) using BP intercalation compounds has been developed. Through effective activation, the charged by reaction with organic alkyl halides is achieved. Functionalization was extensively demonstrated means several spectroscopic techniques and DFT calculations; products showed higher degrees than those obtained neutral routes.
Covalently functionalized graphene derivatives were synthesized via benchmark reductive routes using graphite intercalation compounds (GICs), in particular KC8. We have compared the arylation and alkylation of GIC 4-tert-butylphenyldiazonium bis(4-(tert-butyl)phenyl)iodonium salts, as well phenyl iodide, n-hexyl n-dodecyl electrophiles model reactions. put a focus on evaluation degree addition bulk functionalization homogeneity (Hbulk). For this purpose, we employed statistical Raman...
In this study, two biodegradable Mg-Zn-Ca alloys with alloy content of less than 1 wt % were strengthened via high pressure torsion (HPT). A subsequent heat treatment at temperatures around 0.45 Tm led to an additional, sometimes even larger increase in both hardness and tensile strength. more 110 HV strength 300 MPa achieved Mg-0.2Zn-0.5Ca by procedure. Microstructural analyses conducted scanning transmission electron microscopy (SEM TEM, respectively) atom probe tomography (APT) reveal the...
Herein we report the synthesis of covalently functionalized carbon nano-onions (CNOs) via a reductive approach using unprecedented alkali-metal CNO intercalation compounds. For first time, an in situ Raman study controlled process with potassium has been carried out revealing Fano resonance highly doped CNOs. The was further confirmed by electron energy loss spectroscopy and X-ray diffraction. Moreover, experimental results have rationalized DFT calculations. Covalently derivatives were...
Beta-Ti alloys have been intensively investigated in the last years because of their favorable low Young's moduli, biocompatibility and bio-inertness, making these interesting candidates for implant materials. Due to mechanical strength, efforts are currently devoted increasing it. A promising way improve strength is tailor microstructure using severe plastic deformation (SPD). In this investigation high pressure torsion was used refine a Ti-45wt.%Nb alloy inducing grain size ~50 nm. The...
The thermoelectric efficiency of skutterudite materials can be improved by lowering the lattice thermal conductivity via uniform dispersion a nanosized second phase in matrix filled Co4Sb12. In this work, nanocomposites Ba0.3Co4Sb12 and InSb were synthesized using ball-milling spark plasma sintering. transport properties studied from 4.2 to 773 K. nanoparticles ∼20 nm found dispersed grains with few larger about 10 μm due agglomeration nanoparticles. +2 oxidation state Ba Co4Sb12 resulted...
<p>The relationship between fracture toughness and Yttria content in modern zirconia ceramics was revised. For that purpose, we evaluated here 10 Y<sub>2</sub>O<sub>3</sub>-stabilized (YSZ) materials currently used biomedical applications, namely prosthetic implant dentistry. The most relevant range 2-5 mol% Y<sub>2</sub>O<sub>3</sub> addressed by selecting from conventional opaque 3 YSZ up to more translucent compositions (4-5 YSZs). A...
The chemical bulk reductive covalent functionalization of thin layer black phosphorus (BP) using BP intercalation compounds has been developed. Through effective activation, the charged is achieved by organic alkyl halides. Functionalization was extensively demonstrated means several spectroscopic techniques and DFT calculations, showing higher degrees than neutral routes.
Abstract Black phosphorus intercalation compounds (BPICs) with alkali metals (namely: K and Na) have been synthesized in bulk by solid‐state as well vapor‐phase reactions. By means of a combination situ X‐ray diffraction, Raman spectroscopy, DFT calculations the structural behavior BPICs at different stages has demonstrated for first time. Our results provide glimpse into very steps new family compounds, distinct compared to its graphite analogues (GICs), showing remarkable complexity...
Abstract The solid‐state synthesis of pure sodium‐black phosphorus intercalation compounds (Na‐BPICs) has been optimized in bulk for two stoichiometric ratios. Specifically, in‐situ X‐Ray diffraction (XRD) allowed the precise identification optimal temperature range formation Na‐BPICs: 94 °C–96 °C. Moreover, as undesired Na 3 P takes place at this very same range, we succeeded introducing a new synthetic route based on fast‐thermal ball milling implementation that results production BPIC...
The relationship between fracture toughness and Yttria content in modern zirconia ceramics was revised. For that purpose, we evaluated here 10 Y 2 O 3 -stabilized (YSZ) materials currently used biomedical applications, namely prosthetic implant dentistry. most relevant range 2-5 mol% addressed by selecting from conventional opaque YSZ up to more translucent compositions (4-5 YSZs). A technical 2YSZ extend the of our evaluation. bulk concentration measured X-Ray Fluorescence Spectroscopy....
The Cover Feature shows the structure of a stage 2 sodium-black phosphorus intercalated compound (Na-BPIC) in front its X-ray diffraction pattern that has been instrumental for determination. was successfully synthesized without containing intermetallic phases from pure black (in background) and sodium via ball-milling. image designed by Rafal Konkol at Universität Wien graphics department. More information can be found Communication K. Werbach co-workers.