Materials Literature
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Expelling of the liquid phase during sintering of ZrO2-6.5 mol% Y2O3- 0.5 mol% Pr2O3 ceramic was observed as a result of grain coarsening. ZrO2- 7.0 mol% Y2O3 samples, without Pr2O3 addition, do not show this effect under the same sintering conditions. The expelling process is caused by surface tension forces and attr…
Using an interferometric method to record the velocity of the free surface of a target subjected to two-dimensional shock loading, it is shown experimentally that the decrease in the compression pulse amplitude is due to the nonstationary nature of mesoscale processes — the amplitude decrease is progressively larger f…
Aluminum-rich intermetallic compounds and alloys are important for their technological applications and scientifically interesting for their complex structures such as quasicrystals. Detailed knowledge of interatomic interactions can help explain structural and mechanical properties of these systems. The first paper o…
Polypyrrole nanostructures with diameters ⩽ 10 nm have been electropolymerized using step and pit defects on highly ordered pyrolytic graphite (HOPG) as templates for electropolymerization. Step defects were naturally occurring, and pits were formed via oxidation of freshly cleaved surfaces of an HOPG wafer by heating…
X-ray photoemission measurements of Cu2O are presented.
When crystallisable polymers like isotactic poly(propylene) (iPP) or linear low density polyethylene (LLDPE) are finely dispersed in an incompatible matrix like atactic polystyrene (PS) a fractionated crystallisation process will develop if the number of dispersed droplets is greater than the number of active heteroge…
X-ray photoemission measurements of CuO are presented.
Multimode photoswitching between liquid-crystalline phases (nematic and isotropic) by photochromic organic molecules is reported here. The authors use optically active diarylethylenes to induce chirality in nematic liquid-crystalline (LC) phases and to obtain effective photomodulation of LC phases as well as gradual c…
Compressive plastic deformation of particle-reinforced metal–matrix composites is investigated through numerical modeling at high rates of strain. The numerical modeling is performed using axisymmetric unit cell models, with the particles treated as elastic ellipsoids or cylinders embedded within a viscoplastic matrix…
The dynamics of the ferrielectric-paraelectric transition in lamellar ${\mathrm{CuInP}}_{2}{\mathrm{S}}_{6}$ is studied using Raman scattering. Band assignments for this system are established by comparison with published vibrational spectroscopy information on related chalcogenophosphates as well as with new data on…
We predicted and measured the evolution of smooth muscle cell (SMC) orientation in media-equivalents (MEs) for four fabrication conditions (F-, M-, F+, M+) under Free or Mandrel compaction (F/M) with and without magnetic prealignment of the collagen fibrils in the circumferential direction (+/-). Mandrel compaction re…
We study the effects of finite temperature on the dynamics of non-planar vortices in the classical, two-dimensional anisotropic Heisenberg model with XY- or easy-plane symmetry. To this end, we analyze a generalized Landau-Lifshitz equation including additive white noise and Gilbert damping. Using a collective variabl…
Using kinetic Monte-Carlo simulations of a Solid-on-Solid model we investigate the influence of step edge diffusion (SED) and evaporation on Molecular Beam Epitaxy (MBE). Based on these investigations we propose two strategies to optimize MBE-growth. The strategies are applicable in different growth regimes: during la…
Growth of enteric bacteria on acetate as the sole source of carbon and energy requires operation of a particular anaplerotic pathway known as the glyoxylate bypass. In this pathway, two specific enzymes, isocitrate lyase and malate synthase, are activated to divert isocitrate from the tricarboxylic acid cycle and prev…
A new nonlinear optical (NLO) borate crystal K 2 Al 2 B 2 O 7 (Potassium Aluminum Borate, KAB) has been discovered. The structure has been established by 4-axis X-ray diffraction methods. The material crystallizes in the trigonal space group P321 with a = 8.5657(9) Å, C = 8.463(2) Å and Z = 3. KAB possesses a space ar…
The optical properties of alpha‐Al 2 O 3 have been determined by two independent methods, vacuum ultraviolet (VUV) spectroscopy and electron energy‐loss spectroscopy (EELS) over the energy range from 6 to 142 eV. For each experimental method two sets of high‐quality data have been measured and analyzed from alpha‐Al 2…
CdS/dendrimer nanocomposites that emit blue light are formed by the arrested precipitation of nanometer-scale CdS quantum dots in the presence of Starburst (poly(aminoamine)) dendrimers as the stabilizing host. The authors report a strong photoluminescence with emission maxima at about 450 nm. The optoelectronic prope…
A novel model system of hard colloidal platelets was observed to phase-separate into an isotropic and a liquid crystalline phase. Polarization microscopy revealed that the liquid crystalline phase was of nematic origin. With such orientational ordering in suspensions of platelike particles already being predicted in t…
A series of dendrimer porphyrins ((L 5 ) n P, n = 1−4), which bear different numbers ( n ) of five-layered dendron subunits (L 5 ) at the meso -positions of a porphyrin, were synthesized. Upon excitation of the dendron subunits in CH 2 Cl 2 at 20 °C, (L 5 ) n P showed an intramolecular singlet energy transfer from the…
A high-efficiency guided-mode resonance reflection filter is reported. The device consists of a surface-relief photoresist grating and an underlying HfO (2) waveguide layer deposited on a fused-silica substrate. The spectral response measured with a dye-laser beam at normal incidence exhibited a peak reflectance of 98…