Materials Literature
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A multilayer system is built up that enables vectorial electron transfer along a polarity gradient. For this, pyrene is covalently coupled to a polyeclectrolyte that can then be incorporated into polyelectrolyte multilayers by layer-by-layer technology. High pyrene labeling (1:30) allows for high chromophore density i…
Abstract Structure‐property relationships in exfoliated polyisoprene (PI)/clay nanocomposites have been studied as a function of the clay concentration with rheometry, X‐ray diffraction, small‐angle X‐ray scattering, and transmission electron microscopy. The results presented here indicate that the interlayer spacing…
Orthodontic stainless-steel appliances are considered to be corrosion resistant, but localized corrosion can occur in the oral cavity. This study was undertaken to evaluate the properties of super stainless steels in orthodontic applications. Accordingly, the metallurgical properties, mechanical properties, corrosion…
UDPgalactose 4-epimerase (epimerase) catalyzes the reversible conversion between UDPgalactose and UDPglucose and is an important enzyme of the galactose metabolic pathway. The Saccharomyces cerevisiae epimerase encoded by the GAL10 gene is about twice the size of either the bacterial or human protein. Sequence analysi…
The reaction of generation 2 and generation 4 poly(amidoamine) (PAMAM) dendrimers with K2PtCl2 was studied by several NMR methods. The time dependency of the Pt(II) complexation was followed with 195Pt NMR for both dendrimers and the equilibrium product was further characterized with (1)H NMR, and indirectly detected…
We give a theoretical analysis of published experimental studies of the effects of impurities and disorder on the superconducting transition temperature ${T}_{c}$ of the organic molecular crystals $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}X$ (where $X=\mathrm{Cu}[\mathrm{N}(\math…
Second harmonic generation (SHG) induced by spontaneous magnetization has been investigated for a polar ferromagnetic crystal of ${\mathrm{G}\mathrm{a}\mathrm{F}\mathrm{e}\mathrm{O}}_{3}$. The Kerr rotation of the second harmonic light becomes gigantic with decreasing temperature below the magnetic transition temperat…
A durable titanate ceramic waste form (Synroc) with pyrochlore (Ca(U,Pu)Ti2O7) and zirconolite (CaZrTi2O7) as major crystalline phases has been considered to be a candidate for immobilizing various high-level wastes containing fissile elements (239Pu and 235U). Transmission electron microscopy study of a sintered cera…
We study the role of surface plasmons in the near-field focusing of a finite-linewidth point dipole by a planar silver film using three-dimensional finite element calculations. We find that the intensity distribution in the image plane at a distance of 60 nm from the source is narrowed by a factor of 1.4 in the presen…
CdS–ZnO nanocomposite thin films were prepared using the sol–gel technique. Highly confined nanoparticles of CdS (radius 1.8–4.7 nm) were obtained with ZnO as the matrix. The molar ratio of CdS and ZnO was varied within the range 20:80 to 60:40. The influence of the annealing temperature (373–573 K) on the particle si…
Abstract We have determined with infrared spectroscopic ellipsometry how the nature of the interface between a thin poly(dimethyl siloxane) (PDMS) coating and its substrate affects the rate of PDMS crosslinking reactions. Reactions between vinyl (CHCH 2 ) end groups on PDMS and silyl (SiH) groups in a crosslinker (h…
We study the antiferromagnetic spin-1/2 Heisenberg model on a two-dimensional bipartite quasiperiodic structure, the octagonal tiling, the aperiodic equivalent of the square lattice for periodic systems. An approximate block spin renormalization scheme is described for this problem. The ground state energy and local s…
Two analogous classes of dendrimers with a single azobenzene moiety at the core have been prepared. Flexible benzyl aryl ether dendrimers 1a-e were obtained in good yields by direct alkylation of diphenolic azobenzene 3 with benzyl aryl ether dendrons [G-n]-Br (n = 0-4). In rigid dendrimers 2a-e, the azobenzene config…
Ion implantation is a valuable tool for introducing transition metal ions such as Cr, Mn, Fe, Co and Ni into a variety of semiconductors including AlN, GaN, GaP and SiC. High-transition-temperature ferromagnetic behaviour is found to be the rule rather than the exception. Implantation combined with magnetic screening…
We demonstrate that the application of any external uniform non-Abelian gauge background, no matter how small, leads to a greatly enhanced degeneracy. This degeneracy is so large that even a non-Abelian background field of infinitesimal strength leads to a shocking change in the thermodynamics. The critical temperatur…
Recent findings indicate that in addition to its location in the peripheral plasma membrane, H-Ras is found in endomembranes like the endoplasmic reticulum and the Golgi complex. In these locations H-Ras is functional and can efficiently engage downstream effectors, but little is known about how its activation is regu…
Electron paramagnetic resonance and electron nuclear double resonance (ENDOR) experiments on ZnO nanoparticles reveal the presence of shallow donors related to interstitial Li and Na atoms. The shallow character of the wave function is evidenced by the multitude of 67Zn ENDOR lines and further by the hyperfine interac…
In an effort to find new UV absorbers, the optical properties of CeO 2, SrCeO 3, and Sr 2 CeO 4 were examined by UV−visible diffuse reflectance measurements and electron energy-loss spectroscopy (EELS), and their electronic structures were investigated on the basis of first-principles density functional theory (DFT) c…
We report systematic studies of AC magnetic susceptibility and transport properties of Y(1-x)Ca(x)Ba2Cu3Oz bulk samples with 0\leq x\leq 0.4. Single phase materials, reduction of carrier concentration and decrease of Tc to 85 K were obtained at doping levels up to 20%. For Y0.7Ca0.3Ba2Cu3Oz sample the improvement of g…
The structure and morphology of a set of high hard block content (50% to 100% hard segment by weight) linear thermoplastic polyurethanes has been investigated mainly via small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). All the results obtained in this investigation have been correlated t…