Materials Literature
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Electron spin decoherence caused by elastic spin-phonon processes is investigated comprehensively in a zero-dimensional environment. Specifically, a theoretical treatment is developed for the processes associated with the fluctuations in the phonon potential as well as in the electron procession frequency through the…
We present a comprehensive study relating the nanostructure of ${\mathrm{Ge}}_{0.95}{\mathrm{Mn}}_{0.05}$ films to their magnetic properties. The formation of ferromagnetic nanometer-sized inclusions in a defect-free Ge matrix fabricated by low-temperature molecular beam epitaxy is observed down to substrate temperatu…
This work verifies the applicability of two‐stage sintering as a means of suppressing the final stage grain growth of submicrometer alumina. The first heating step should be short at a relatively high‐temperature (1400°–1450°C) in order to close porosity without significant grain growth. The second step at temperature…
Iijima's observation in 1991 of fullerene-like materials by high-resolution transmission electron microscopy heralded the beginning of the carbon nanotube (CNT) era. A wealth of theoretical predictions and experimental verifications about CNTs have disclosed remarkable size- and structure-dependent properties that are…
Ring-contracted porphyrins: meso-Aryl subporphyrins were synthesized by using a method in which tripyrrolylborane acts as a template for the Adler method. This study demonstrates that, although the subporphyrins retain porphyrinic properties, ring contraction has a significant impact on the electronic structure. The p…
In this paper, we report the development of rod-shaped semiconductor nanocrystals (quantum rods) as fluorescent biological labels. Water-soluble biocompatible quantum rods have been prepared by surface silanization and applied for nonspecific cell tracking as well as specific cellular targeting. Quantum rods are brigh…
The atomic and electronic structure of a set of pristine single wall SiC nanotubes as well as Si-substituted carbon nanotubes and a SiC sheet was studied by the local-density approximation (LDA) plane wave band structure calculations. Consecutive substitution of carbon atoms by Si leads to a gap opening in the energet…
A history is given of the applications of the simple expression generalized from the surmise by Wigner and also by Ibach to extract the strength of the interaction between steps on a vicinal surface, via the terrace width distribution (TWD). A concise guide for use with experiments and a summary of some recent extensi…
The switching probability of a single-domain ferromagnet under spin-current excitation is evaluated using the Fokker-Planck equation(FPE). In the case of uniaxial anisotropy, the FPE reduces to an ordinary differential equation in which the lowest eigenvalue $λ_1$ determines the slowest switching events. We have calcu…
The band gaps, longitudinal and transverse effective masses, and deformation potentials of ScN in the rock-salt structure have been calculated employing ${G}_{0}{W}_{0}$-quasiparticle calculations using exact-exchange Kohn-Sham density-functional theory one-particle wave functions and energies as input. Our quasiparti…
We investigate the lattice dynamics and thermodynamics of nonmagnetic bcc vanadium as a function of temperature and pressure, using the first principles linear response linear-muffin-tin-orbital method. The calculated phonon density of states (DOS) show strong temperature dependence, different from inelastic neutron s…
In situ Mn K-edge fluorescence X-ray absorption spectroscopy (XAS) was used to analyze the manganese oxides electrodeposited on a porous carbon paper substrate for use in electrochemical capacitors in order to determine the local and electronic structural changes in the material as a function of the applied potential…
Lang und schmal: Tetragonale SnO2-Nanodrähte wurden durch thermische Verdampfung ohne Zusatz von Metallkatalysatoren synthetisiert. Die verbesserten elektrochemischen Eigenschaften dieser Nanodrähte resultieren vermutlich aus dem außergewöhnlich großen Aspektverhältnis und der Abwesenheit von Metallverunreinigungen.
The structure and dynamics of alkylammonium-modified montmorillonites with different cation exchange capacity (CEC), ammonium head groups, and chain length is investigated by molecular dynamics simulation for a large set of structures and compared to a wide array of experimental data. In the 44 systems, the relationsh…
To investigate the effect of seed layer on the growth of ZnO nanorods during hydrothermal synthesis, different types of sputter-deposited ZnO films were used. The changes in growth rate, diameter, density, and surface area of highly oriented ZnO nanorods on each seed layer were examined. The growth rate of ZnO nanorod…
We further miniaturize a recently established silver-based negative-index metamaterial design. By comparing transmittance, reflectance, and phase-sensitive time-of-flight experiments with theory, we infer a real part of the refractive index of -0.6 at a 780 nm wavelength--which is visible in the laboratory.
The dynamics of long range translation and local motions of oxygen in ${\mathrm{SrTi}}_{0.2}{\mathrm{Fe}}_{0.8}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ have been studied by electrical conductivity and quasielastic neutron scattering. The activation energy of the translational ionic diffusion measured by elec…
We report on size-dependent properties of dithallium selenide, ${\mathrm{Tl}}_{2}\mathrm{Se}$. We have carried out a comparative nuclear magnetic resonance (NMR) study of ${\mathrm{Tl}}_{2}\mathrm{Se}$ nanorods and bulk samples, measuring NMR spectra and spin-lattice relaxation rate of $^{203}\mathrm{Tl}$ and $^{205}\…
In attempts to determine the crystal structure of small molecule-protein complexes, a common frustration is the absence of ligand binding once the protein structure has been solved. While the first structure, even with no ligand bound (apo), can be a cause for celebration, the solution of dozens of apo structures can…
Abstract We undertook this study to suggest the optimal spinning process conditions that provide a proper range of tenacity and biodegradability in textile fibers. The effect of melt‐spinning speed and heat treatment on the mechanical properties and biodegradability of poly(lactic acid) (PLA) fibers were investigated.…