Materials Literature
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Nylon-6−organoclay nanocomposites were prepared by melt processing via twin-screw extrusion for the purpose of comparing the effect of the number alkyl groups attached to the nitrogen of the organic modifier on the level of organoclay exfoliation. Wide-angle X-ray scattering and transmission electron microscopy techni…
Thin films of tungsten-doped vanadium(IV) oxide were prepared on glass substrates from the atmospheric pressure chemical vapor deposition of vanadium(IV) chloride, tungsten(VI) ethoxide, and water at 500−600 °C. The films were characterized by Raman microscopy, glancing angle X-ray diffraction (GAXRD), X-ray photoelec…
We report on the coupling between ferroelectric and magnetic order parameters in a nanostructured BaTiO3-CoFe2O4 ferroelectromagnet. This facilitates the interconversion of energies stored in electric and magnetic fields and plays an important role in many devices, including transducers, field sensors, etc. Such nanos…
Hypersensitivity Injection-site extravasation (1999): Fleming A+, J Hand Surg [Br] 24, 390 Injection-site inflammation Injection-site necrosis Injection-site reactions (sic) (3-20%) Injection-site ulceration Mucositis (1999): Ormrod D+, Drugs Aging 15, 389 Myalgia (1995): Fountzilas G+, Med Pediatr Oncol 24, 23 (55%)…
Abstract For Abstract see ChemInform Abstract in Full Text.
Permanent magnet rings are presented, which exploit the image effect in the surrounding circular iron shields. The theory is given for a general permanent ring when the magnetization orientation phi at each coordinate angle psi changes by phi =(n+1)psi, where n is a positive or negative integer. For the uniformly magn…
Abstract A novel sugar‐containing poly(ornithine) dendrimer is synthesized for possible antigen delivery and related applications. The dendrimer contains an ornithine dendron as interior scaffolding and oligosaccharides on the periphery, which provide an attachment site for a peptide antigen. Maltose or lactose is bou…
We have carried out ac conductivity measurements on different alkali tellurite and silver halide containing glasses exhibiting high electronic polarizabilities. The analysis of the conductivity spectra provides strong evidence that the ionic site energy distributions in these glasses are distinct from those in convent…
We study both theoretically and experimentally the structure of the doped silicon clathrate II ${\mathrm{Na}}_{x}{\mathrm{Si}}_{34}.$ We find that contrary to published works, the sodium atoms do not retain the ${T}_{d}$ symmetry inside the ${\mathrm{Si}}_{28}$ cages and move about 1 \AA{} away from the center of the…
We present a study of the spin dynamics of the magnetic dimer $[\mathrm{Fe}(\mathrm{OMe})(\mathrm{dpm}{)}_{2}{]}_{2},$ using M\"ossbauer spectroscopy. In this cluster, the two iron(III) ions are antiferromagnetically coupled so that the dimer presents a $S=0$ spin ground state. Spin multiplets with values of S ranging…
The Gd(III) complexes of the two dimeric ligands [en(DO3A)2] {N,N'-bis[1,4,7-tris(carboxymethyl)-1,4,7,10-tetraazacyclododecan-10-yl-methylcarbonyl]-N,N'-ethylenediamine} and [pi(DTTA)2]8- [bisdiethylenetriaminepentaacetic acid (trans-1,2-cyclohexanediamine)] were synthesized and characterized. The 17O NMR chemical sh…
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…