Materials Literature
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Homogeneous surface alignment of liquid crystals (5CB) is observed for films formed by coating with aqueous solutions of hydroxypropylcellulose (HPC) for high coating speeds and thin coating thicknesses. On the other hand, for films formed with isotropic ethanol solutions of HPC, 5CB molecules retain the flow-induced…
Abstract The influence of phase morphology and carbon black distribution on energy storage and dissipation during dynamic excitations of rubber blends is discussed. It is shown that differences in the local stiffness of the phases in the glass transition regime of unfilled blends lead to characteristic deviations of t…
A series of carbosilane dendrimer generations G x RF6 ( x = 1, 2, 3) with perfluorohexyl (−C 6 F 13 ) end groups as well as an unmodified G3 with allyl end groups has been investigated using dielectric spectroscopy. The experiments comprised a frequency range from 2 Hz to 1 GHz. The dendrimers show a fast (β) relaxati…
Molecular Dynamics (MD) simulations were used to study the relationship between structure and transport properties in five liquids (NaAlO 2, Na 2 Al 2 SiO 6, NaAlSiO 4, Na-AlSi 2 O 6, and NaAlSi 3 O 8 ) in the system NaAlO 2 -NaAlSi 3 O 8 at temperatures ranging from 4000 to 6000 K and pressures from 0 to 55 GPa. Seve…
The picosecond dynamics of noncovalent ensembles for energy transfer based on anion chelation are reported. The photoactive noncovalent complexes are assembled via salt-bridge formation between carboxyl-containing porphyrin photodonors and a monoprotonated pentapyrrolic sapphyrin acceptor. These complexes are formed w…
This paper describes a new technique for indexing powder diffraction data. The lattice parameters (unit-cell dimensions) { a , b , c ,α,β,γ} define the parameter space of the problem, and the aim is to find the optimal lattice parameters for a given experimental powder diffraction pattern. Conventional methods for ind…
We present a theoretical discussion of the reversible parking problem, which appears to be one of the simplest systems exhibiting glassy behavior. The existence of slow relaxation, nontrivial fluctuations, and an annealing effect can all be understood by recognizing that two different time scales are present in the pr…
We make a detailed analysis of the exact relativistic core-shell models recently proposed to describe a black hole or neutron star surrounded by an axially symmetric, hollow halo of matter and in a seminal sense also galaxies, since there are massive shell-like structures—as, for example, rings and shells—surrounding…
In this work we have studied the hydrolysis of titanium tetrabutoxide (TTB) in butyl alcohol. The hydrolysis was carried out by adding H2O for a molar ratio water/alkoxide of 4. The hydrolysis has been followed by FT-IR spectroscopy, and the evolution of the Ti-O-C bands of the TTB molecule have been analysed. These b…
Classical theory of electrical conduction and conducting materials electron energy in solids electron emission semiconductor properties and materials magnetic phenomena and magnetic materials dielectric materials optical properties and materials thermal and thermoelectric properties superconductivity and superconducto…
A modified phenomenological model for Shape Memory Alloy (SMA) is presented for design of an SMA wire based rotatory actuator. In this model, the forward and reverse transformation functions are derived from two kinds of tests: standard tension test, carried out at constant temperature, and thermal cyclic test under c…
Thin SiO2 layers were exposed to an HBr/O2 plasma for a variety of short periods, reproducing the over-etching process after polycrystalline Si gate electrodes have been etched and the gate oxide layer is exposed. Samples were transferred under vacuum to an x-ray photoelectron spectrometer for analysis. After relative…
An evanescent wave ellipsometric technique is used to study the orientational wetting of ${4}^{\ensuremath{'}}$,4- alkylcyanobiphenyls $(n\mathrm{CB},n=5--9)$ at the interface with a series of self-assembled monolayers. Brewster angle measurements are interpreted in terms of a global orientational wetting phase diagra…
Electron paramagnetic resonance (EPR) has been used to characterize a new donor center in ZnGeP2 crystals. An equally spaced triplet of lines with a 1:2:1 intensity ratio is observed at g=2.0026 when a crystal is exposed to 633 nm light (below band gap) while at temperatures below 50 K. These EPR lines are approximate…
<div class="htmlview paragraph">Particulates (soot) were sampled from the regenerative trap of an automotive diesel engine run under three speed/load conditions. The fuel was doped with a cerium-based catalyst to promote oxidation of the soot bed. The soots were subjected to combustion testing in a DTG under bot…
A form of turbostratic boron nitride containing a large percentage of micrometre-size conically shaped particles was investigated by transmission electron microscopy. Electron diffraction patterns revealed the presence of correlations between adjacent boron nitride layers. The diffraction patterns were also used to de…
Regulation of protein kinase A by subcellular localization may be critical to target catalytic subunits to specific substrates. We employed epitope-tagged catalytic subunit to correlate subcellular localization and gene-inducing activity in the presence of regulatory subunit or protein kinase inhibitor (PKI). Transien…
Mössbauer spectroscopy is used to study the hyperfine magnetic fields at tin 119Sn ions introduced as an isomorphic impurity in the lattices of the orthoferrites RFeO3. The large reduction in the field H Sn hf (4.2 K) observed when R is changed from La to Lu correlates with the drop in the Néel point and indicates tha…
<div class="htmlview paragraph">Currently, 80% of European diesel passenger cars are turbocharged and as emission standards become more stringent exhaust gas recirculation (EGR) will be the primary means of suppressing oxides of nitrogen (NOx). The lighter the load the greater will be the combustion tolerance to…
In the band theory of ferromagnetism there is a relative shift in the position of majority and minority spin bands due to the self-consistent field due to opposite spin electrons. In the simplest realization, the Stoner model, the majority and minority spin bands are rigidly shifted with respect to each other. Here we…