Materials Literature
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A Rashba type spin-orbit splitting is found for quantum well states formed in ultrathin Pb films on Si(111). The resulting momentum splitting is comparable to what is found for semiconductor heterostructures. The splitting shows no coverage dependency and the sign of the spin polarization is reversed compared to Rashb…
Blauer Gürtel: Die Polykondensation von Pyren- (blau) und Triphenylenmonomeren (grün) resultiert in kovalenten organischen Netzwerken mit hexagonalen Mesoporen (siehe Bild). Das Material ist gürtelförmig, absorbiert Photonen über einen weiten Wellenlängenbereich und emittiert eine blaue Lumineszenz. Darüber hinaus ist…
An analysis of the magnetocaloric properties of pure and substituted Fe 2 P compounds is made based on KKR-CPA electronic structure calculations and magnetization M ( H , T ) measurements. The computed electronic densities of states and magnetic moments are used to calculate the values of both the electronic and magne…
Using X- ray photon correlation spectroscopy measurements on gold nanoparticles embedded in polymethylmethacrylate we provide evidence for existence of an intrinsic length scale for dynamic heterogeneity in polymer nanocomposites similar to that in other soft materials.We also show how the dynamics varies in a complex…
The magnetic properties of annealed, epitaxial Ga0.93Mn0.07As layers under tensile and compressive stress have been investigated by X-band (9GHz) and Q-band (35GHz) ferromagnetic resonance (FMR) spectroscopy. From the analysis of the linewidths of the uniform mode spectra the FMR Gilbert damping factor "alpha" has bee…
Superelastic Shape Memory Alloys (SE SMAs) are unique alloys that have the ability to undergo large deformations and return to their undeformed shape by removal of stresses. This study aims at assessing the seismic behavior of beam-column joints reinforced with SE SMAs. Two large-scale beam-column joints were tested u…
Results are presented from an experimental and theoretical study of the electronic properties of back-gated graphene field effect transistors (FETs) on Si/SiO(2) substrates. The excess charge on the graphene was observed by sweeping the gate voltage to determine the charge neutrality point in the graphene. Devices exp…
The frequency dispersion of the dynamic conductivity of graphene, of a multilayer graphene, and of IV–VI semiconductors is considered as a function of the temperature and carrier density in the range of frequencies that are higher than the carrier relaxation rate but are lower than the conduction band width. A narrow…
Supramolecular gels that change their state or structure in response to anion stimuli have been highlighted. Only a few examples exist of such supramolecular gels, the structures and properties of which can be controlled and modulated by interactions with anions. To form anion-responsive dimensionally-controlled organ…
We present experimental evidence of sharp spectral features in the optical response of 2D arrays of gold nanorods. A simple coupled dipole model is used to describe the main features of the observed spectral line shape. The resonance involves an interplay between the excitation of plasmons localized on the particles a…
Acetylacetone reacts with 3-aminopropyl[tris(trimethylsilyloxy)]silane to give a mixture of the isomers 4-[3′-tris(trimethylsilyloxy)silylpropyl]iminopent-2-en-2-ol (90%) and 4-[3′-tris(trimethylsilyloxy)silylpropyl]aminopent-3-en-2-one (10%). According to 1H and 13C NMR data, both isomers exist in the cis-and trans-f…
Abstract The ability of the dinuclear nickel(II) complex [Ni II 2 L(L′)] + , where L 2− represents a macrocyclic N 6 S 2 ligand, to coordinate monodentate coligands has been examined. Three complexes with L′ = CH 3 CN, CH 2 =CHCN, and (BH 3 CN) − have been synthesized: [Ni II 2 (L)(NCMe)][BPh 4 ] 2 ( 3 ), [Ni II 2 (L)…
The self-rotation on the polarization azimuth and the formation of a supramolecular chiral structure when an elliptically polarized light beam propagates through an amorphous azopolymer film are used to implement a two-wavelength chiroptical switch. The macrostructures generated by each excitation beam have different…
Higher performance and durability requirements of gas-turbine engines will require a new generation of thermal barrier coatings (TBCs).This is particularly true of engines operated at higher temperatures, where TBCs are subjected to attack by CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) glassy deposits.In this work, a new approach…
In this paper, we investigate the several roles that hydrogen plays in the catalytic growth of carbon nanotubes from the point of view of gas species, catalyst activation and subsequent interaction with the carbon nanotubes. Carbon nanotubes and nanofibres were grown by thermal chemical vapour deposition, using methan…
Current-perpendicular-to-plane transport properties of sputtered polycrystalline Fe3O4/α-Fe2O3 heterostructures were investigated. A rectifying behavior was observed. The voltage shift increases linearly with temperature and turns from negative to positive at 230 K. The current-dependent magnetoresistance (MR) changes…
We have investigated the thermal expansion of several synthetic feldspars, including Li-feldspar, rubicline (Rb-microcline), Rb-sanidine, and buddingtonite (NH 4 -feldspar). When analyzed in conjunction with earlier data on both ordered and disordered Na- and K-feldspars, it is clear that the coefficient of thermal ex…
We report high-pressure Raman experiments on the tangential vibrational modes of CarboLex bundled single-walled carbon nanotubes up to 6.5 GPa using two different excitation energies: 1.96 and 2.41 eV. We show through the curve-fitting technique, together with the modified interband transition energies versus diameter…
By employing a simple bottom-up method for the first time and using ideas learned from nature, especially from the lotus leaf, we fabricated unique Co(3)O(4) hierarchical boat-like hollow cages about 30 µm in length and 8 µm in width at the middle constituted of many nanorods and nanoparticles. The various morphologie…
Hydrogenated diamondlike carbon films were prepared at different reactive times by dc-pulse plasma chemical vapor deposition technique. The thickness of the film increased significantly with the reactive time, and the stress is just 0.9GPa when the thickness of the film increased to 2μm. The structure analysis by high…