Materials Literature
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Eine beschleunigte NO-Reduktion wird beobachtet, wenn NO mit Ammoniak und einer wässrigen NH4NO3-Lösung in Abwesenheit von NO2 bei niedrigen Temperaturen (200–300 °C) an kommerziellen vanadium- und eisendotierten Zeolithkatalysatoren reagiert. Die Reduktionseffizienz kommt der einer schnellen selektiven katalytischen…
Single crystalline zinc oxide (ZnO) nanowires were synthesized on sputter‐deposited ZnO seed layers via hydrothermal reactions in an equimolar (20 mM) aqueous solutions of Zn(NO 3 ) 2 ·6H 2 O and C 6 H 12 N 4 at 90°C. The sputter‐deposited ZnO seed layers were prepared to exhibit different crystalline structures in or…
The first direct bromination of double-walled carbon nanotubes under microwave irradiation is reported. XPS analysis demonstrates the formation of covalent C−Br bonds with a loading of ∼5% w/w. Spectroscopic and microscopic (HR-TEM, TEM, SEM) analysis exclude any structural degradation of the CNTs framework, suggestin…
The magnetic properties and magnetocaloric effect in antiferromagnetic superconductor Dy0.9Tm0.1Ni2B2C compound have been studied. The magnetic phase transition TM (∼9.2 K) occurs above the superconducting transition temperature Tc (∼4.5 K). A giant reversible magnetocaloric effect has been observed, which is related…
Silk fibers harvested from the web, cocoon, and prey wrapping of the spider Nephila clavipes have been studied by polarized Raman spectromicroscopy. The technique is efficient to differentiate the various types of silk by probing monofilaments produced by the major ampullate (MA), minor ampullate (MI), cylindriform, f…
We report on the observation of weak antilocalization associated with large spin-orbit coupling in a tunable $d$ electron system: a quasi-two-dimensional electron gas formed in a ${\text{KTaO}}_{3}$ field-effect transistor. We find that spin-precession length of electrons can be tuned by gate voltage ${V}_{\text{G}}$…
The cytoplasmic protein AxDGC2 regulates cellulose synthesis in the obligate aerobe Acetobacter xylinum by controlling the cellular concentration of the cyclic dinucleotide messenger c-di-GMP. AxDGC2 contains a Per-Arnt-Sim (PAS) domain and two putative catalytic domains (GGDEF and EAL) for c-di-GMP metabolism. We fou…
An improved model for CO2 laser ablation impulse in polyoxymethylene and similar polymers is presented that describes the transition effects from the onset of vaporization to the plasma regime in a continuous fashion. Several predictions are made for ablation behavior.
Novel tissue-culture bioreactors employ flow-induced shear stress as a means of mechanical stimulation of cells. We developed a computational fluid dynamics model of the complex three-dimensional (3D) microstructure of a porous scaffold incubated in a direct perfusion bioreactor. Our model was designed to predict high…
Reaction of RCH(2)N(CH(2)CH(2)NHSO(2)Tol)(2) (R = 2-NC(5)H(4) (8, H(2)L(py)) or MeOCH(2) (9, H(2)L(OMe))) with Ti(NMe(2))(4) at room temperature afforded Ti(L(py))(NMe(2))(2) (10) or Ti(L(OMe))(NMe(2))(2) (11), respectively, which contain tetradentate bis(sulfonamide)amine ligands. The corresponding reactions with Ti(…
We present experimental results on the giant Hall effect in the Heusler alloy ${\text{Ni}}_{50}{\text{Mn}}_{50\ensuremath{-}\text{x}}{\text{In}}_{\text{x}}$ with $x=15.2$. An unusual field dependence of the Hall resistivity $({\ensuremath{\rho}}_{H})$ was observed in the vicinity of the martensitic phase transition, w…
Pressure-sensitive adhesives represent one of the most important commercial applications of block copolymers. The large-strain tensile properties of these soft adhesive materials play a dominant role in determining their adhesive properties. In many cases changes in the polymer architecture significantly affect the la…
Abstract PolyHIPE are highly porous, emulsion‐templated polymers typically synthesized via free‐radical polymerization within a water‐in‐oil (W/O) high internal phase emulsion (HIPE) whose dispersed, aqueous phase occupies more than 74% of the volume. The synthesis of a polyHIPE containing biodegradable polymers is no…
Monolayer graphene has been grown on polycrystalline Ru thin films on SiO2/Si substrates. The Ru films have columnar structure with strongly aligned grains exposing flat (0001) surface facets. Adjacent grains show small relative tilts of their [0001] axes and variations in in-plane orientation. Graphene layers grown o…
Monodispersed CdSe nanoparticles with sufficient luminescence intensity have been prepared by chemical method in the presence of mercaptoacetic acid as a capping agent. Cadmium acetate (Cd(Ac) 2 .2H 2 O) and sodium selenosulfate (Na 2 SeSO 3 ) are used as a cadmium and selenium sources respectively. The resulting nano…
Intermetallic compound ErGa exhibits two successive magnetic transitions: spin-reorientation transition at TSR=15 K and ferromagnetic-paramagnetic transition at TC=30 K. Both transitions contribute greatly to the magnetic entropy change (ΔSM), each yielding a significant peak on their ΔSM-T curve and thus a considerab…
The authors report the synthesis and magnetic properties of carbon-doped ZnO (ZnO:C) nanoneedles. A saturated magnetic moment of 2.16 emu/cm3 was found in the ZnO:C nanoneedles. The samples showed anomalous Hall effect and p-type conduction with a hole concentration of 1.8×1018 cm−3. The ferromagnetism in the ZnO:C na…
Deposition of Al2O3 and HfO2 dielectrics on graphite is studied as a route to the formation of a high-κ dielectric on graphene. Electron beam evaporation of metal Al and Hf is followed by a separate oxidation step. Reactive e-beam deposition of HfO2 by introduction of O2 to the deposition chamber is also demonstrated…
We investigate the electron spin resonance of an ensemble of nitrogen-vacancy (NV) color centers in a bulk diamond crystal. The four possible orientations of the NV center in the lattice lead to different dependences on the magnitude and the orientation of an external static magnetic field. Experimental results obtain…
Three-dimensional nanoscale constructs are finding applications in many emerging fields, including energy generation and storage, advanced water and air purification, and filtration strategies, as well as photocatalytic and biochemical separation systems. Progress in these important technologies will benefit from impr…