Materials Literature
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Abstract A versatile colloidal templating strategy to fabricate hierarchically structured inverse opals is investigated. A sequence of infiltration and pyrolysis steps provides access to a range of material combinations such as SiO2, Al2O3, or TiO2. The experimental results also document the feasibility of this method…
The effects of temperature and pressure on phonons in B20 compounds FeSi${}_{1\ensuremath{-}x}$Al${}_{x}$ were measured using inelastic neutron scattering and nuclear-resonant inelastic x-ray scattering. The effect of hole doping through Al substitution is compared to results of alloying with Co (electron doping) in F…
We have investigated the magneto-optical response of Fe and CrO${}_{2}$ epitaxial films by pump-probe polarimetry, showing that charge and spin dynamics can be unambiguously disentangled. The time-resolved Kerr ellipticity and rotation in the metallic sample are essentially identical after the initial transient (short…
One-dimensional Fibonacci gratings are used to transform evanescent waves into propagating waves for far-field super-resolution imaging. By detecting far-field intensity distributions of light through objects in front of the Fibonacci grating in free space, we can observe the objects with nearly λ/9 spatial resolution…
In this study, the in-cylinder soot and NOx trade off was investigated in a compression engine by implementing premixed charge compression ignition (PCCI) coupled with low temperature combustion (LTC) for selected regimes of 1–3 bars IMEP. In order to achieve that, an omnivorous (multifuel) single cylinder diesel engi…
We demonstrated the suppression of Fe incorporation into undoped GaN layers grown on an Fe-doped GaN layer by metal organic chemical vapor deposition (MOCVD). Our systematic study of the depth profile of Fe doping by secondary-ion mass spectrometry (SIMS) revealed that Fe segregation on the growth surface is responsib…
We have investigated the adsorption and lubricating properties of neutral and charged amphiphilic diblock copolymers at a hydrophobic polydimethylsiloxane (PDMS) interface in an aqueous environment. The diblock copolymers consist of a hydrophilic block of either neutral poly(ethylene glycol) (PEG) or negatively charge…
FGF-2 is often used as a supplement to stem cells culture medium aiming at preserving their self-renewal capacity and plasticity through the passages. However, little is known on the influence of the underlying substrate in these interactions. In this study, we have used mixed self-assembled monolayers with different…
Graphite intercalation compounds (GICs) of a series of symmetric or asymmetric tetraalkylammonium (TAA) intercalates are obtained from stage-1 [Na(en)1.0]C15 via cation exchange. The prepared dull-black TAA-GICs contain either flattened monolayer or bilayer galleries, with significant cointercalation of the dimethylsu…
Abstract The pyridinophane complex [Mn(Py 2 N 2 )(H 2 O) 2 ] 2+ catalyses the disproportionation of H 2 O 2 in aqueous solution over a wide pH range. Kinetic investigations reveal an induction period, which is proposed to involve the formation of a hydroperoxo intermediate, as well as evidence for catalyst self‐inhibi…
A salt-inclusion mixed-valence uranium(V,VI) silicate, [Na9F2][(U(V)O2)(U(VI)O2)2(Si2O7)2], was synthesized under hydrothermal conditions at 585 °C and 160 MPa and structurally characterized by powder and single-crystal X-ray diffraction (XRD). The valence states of uranium were established by U 4f X-ray photoelectron…
The time-to-breakdown ( t BD ) of Al 2 O 3 deposited by ozone-based atomic layer deposition (ALD) on dry-etched n-type GaN was evaluated by constant-voltage-stress time-dependent dielectric breakdown (TDDB) measurements. The influence of dry etching was not observed in the TDDB and current–voltage ( I – V ) measuremen…
Low-temperature vapor-phase tungsten atomic layer deposition (ALD) using WF6 and dilute silane (SiH4, 2% in Ar) can yield highly conductive coatings on nylon-6 microfiber mats, producing flexible and supple nonwovens with conductivity of ∼1000 S/cm. We find that an alumina nucleation layer, reactant exposure, and depo…
Using a top-down approach, an agent-based model was developed within NetLogo where cells and extracellular matrix (ECM) fibers were composed of multiple agents to create deformable structures capable of exerting, reacting to, and transmitting mechanical force. At the beginning of the simulation, long fibers were rando…
Very recently, one-dimensional nanowire (NW) sensors have attracted great attention as smart optical endoscopes to probe and manipulate intracellular biological processes. However, NWs often have limited optical response to the intracellular environment changes. In this work, a near-infrared nanowire optical endoscope…
Data on the ion-exchange and complexing organosilicon adsorbents published during the last 10–12 years, including the results of systematic research of the authors, are summarized and analyzed. The following types of substances are considered: silicas with covalently grafted modifiers, silicas and aluminosilicates wit…
Der Starke ist am mächtigsten allein: In den Poren eines MOF (hellblau im Bild) können Moleküle eines hoch reaktiven MnIII(μ-O)2MnIV-Wasseroxidationskatalysators (mehrfarbige Kugeln) isoliert werden. Das resultierende System katalysiert die Wasseroxidation bei minimierten intermolekularen Neben- und Zerfallsreaktionen…
Different ways of anions introduction were applied to construct cluster-based frameworks, owning to the versatile coordination ability of the formate anion and its sensitivity to the pH value of the reaction system. Three tetra-, penta-, and hexanuclear cluster-based cobalt-organic frameworks, [Co 2 ( L ) 3 (HCO 2 )·M…
The junction diameter D dependence of effective magnetic fields in a recording layer of CoFeB–MgO magnetic tunnel junctions with perpendicular magnetic easy axis is evaluated by ferromagnetic resonance measurements using the homodyne detection technique. The effective perpendicular magnetic field increases with decrea…
Duplex stainless steels (DSS) may be defined as a category of steels with a two-phase ferritic-austenitic microstructure, which combines good mechanical and corrosion properties. However, these steels can undergo significant microstructural modification as a consequence of either thermo-mechanical treatments (ferrite…