Materials Literature
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We report on the infrared spectra of $R{\mathrm{NiO}}_{3}$ $(R=\mathrm{Eu},$ Ho, Y). They provide evidence of phonon and insulating gap behavior and point to the monoclinic distortion at the metal-insulator (MI) transition as a feature for all $R{\mathrm{NiO}}_{3}$ $(R\ensuremath{\ne}\mathrm{La}).$ We hypothesize that…
We demonstrated liquid crystalline template-directed and photoinduced localization of orientationally ordered polymer networks in a liquid crystal host. In the limit of a diffusion-controlled polymerization process, the location of these networks in a liquid crystal (LC) cell can be controlled by varying the wavelengt…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTInfluence of Cross-Link Density and Deformation on the NMR Relaxation Dispersion of Natural RubberSobiroh Kariyo and Siegfried StapfView Author Information Lehrstuhl für Makromolekulare Chemie and Magnetic Resonance Center MARC, ITM…
Polymeric capsules possessing a shell-in-shell structure were fabricated by assembling layers of polyelectrolytes with interlayers of silica nanoparticles onto microspheres of melamine formaldehyde. Subsequently the cores were removed with hydrochloric acid and the silica layers with hydrofluoric acid. Removal of the…
En este trabajo, se ha medido la distribución de ángulos de desorientación en una aleación de Mg AZ31 laminada. Los resultados obtenidos se han comparado con varias distribuciones calculadas para un agregado de cristales hexagonales, mediante el método de simulación de Monte Cario. En particular, se ha calculado la di…
The unoccupied electronic structure in the surface state of lightly doped ${\mathrm{SrTiO}}_{3}$ has been studied by resonant inverse-photoemission spectroscopy (RIPES). The RIPES spectra show two features whose energy separations match the ${t}_{2g}$ and ${e}_{g}$ subbands of unoccupied Ti $3d$ state. A peak clarifie…
The isotropic-nematic phase behavior of a binary mixture of rodlike and platelike particles is studied within Onsager's second virial theory. The phase behavior is obtained from the numerically exact equilibrium orientational distribution functions for both uniaxial and biaxial nematic phases. Inspired by recent exper…
By studying the phase behaviour and the short range order of polystyrene microgel colloids in a good solvent we demonstrated that these particles can be considered as hard spheres or nearly hard spheres if the internal cross link density is made sufficiently high. A binary mixture of 1:50 crosslinked (1 crosslink per…
Isomerization of olefins, in particular eugenol and safrole, is an important reaction as the products, namely isoeugenol and isosafrole, find application in pharmaceuticals and fragrances. The catalyst employed to carry out this reaction is either a strong alkaline solution (KOH or KOtBu) or precious metal catalysts u…
A neutron-diffraction study on an A-site-ordered perovskite manganite $R{\mathrm{BaMn}}_{2}{\mathrm{O}}_{6}$ $(R=\mathrm{Tb})$ has revealed that the magnetic structure is characterized by two modulation vectors, (1/2 0 1/4) and (1/4 1/4 1/4), in the primitive cubic setting. The appearance of the magnetic order is acco…
The spectral properties of azo dye aggregates have been used to determine the influence of the dendritic surface of Starburst poly(amidoamine) dendrimers on the alignment of electrostatically bound azo dyes. The surface structure and morphology of dendrimers provide enhanced opportunities for the ordered assembly of a…
SF 6 -RF-plasma environments were employed for the generation of SF x -oxygen-scavenger species, and used for the synthesis of thin highly fluorinated paper, poly(acrylic acid) (PAA), polyethylene (PE), plasma-oxidized polyethylene (OxPE), and poly(vinyl alcohol) (PVA) surface layers. The concentration of fluorine ato…
The growth morphology of regular eutectics has been studied using a model eutectic alloy and a transparent ${\mathrm{CBr}}_{4}\ensuremath{-}{\mathrm{C}}_{2}{\mathrm{Cl}}_{6}$ eutectic alloy. A modified cellular automaton (MCA) model is developed to model the evolution of regular eutectic microstructures. Different fro…
A series of dinuclear ruthenium complexes with 1,2-dicarbonylhydrazido (DCH) ligands having various substituents were prepared in order to study the correlation between their optical, electrochemical behaviour and the electron density within the bridging ligands. As the average donor strength of the substituent increa…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFe-Filled Carbon Nanotubes: Nano-electromagnetic InductorsP. C. P. Watts, W. K. Hsu, D. P. Randall, V. Kotzeva, and G. Z. ChenView Author Information School of Chemistry, Physics and Environmental Science, University of Sussex, Brighton BN1 9QJ, U.K., School of Biologi…
The synthesis of novel electrochemically amphoteric TTFAQ-sigma-A compounds (TTFAQ = 9,10-bis(1,3-dithiol-2-ylidene)-9,10-dihydroanthracene, sigma = saturated spacer, A = polynitrofluorene acceptor) is reported. Their solution redox behavior is characterized by three single-electron reduction and one two-electron oxid…
A gold nanoparticle surface-modified with amide ligands shows enhanced optical sensing of anions: the detection limit is increased by about three orders of magnitude higher than that originally expected from the anion binding ability of neutral amide ligands.
Recently, a method for evaluating the fracture toughness of ceramics has been proposed by Fett based on the computed crack‐opening displacements of cracks emanating from Vickers hardness indentations. To verify this method, experiments have been conducted to determine the toughness of a commercial silicon carbide cera…
Different existing elastodynamical models of icosahedral quasicrystals are analyzed. The simplest minimal model of the phonon-phason dynamics is formulated. Physical restrictions and possible applications of the proposed model are considered. Several generalizations of the minimal model are discussed. It is shown that…
[structure: see text] The viability of the Diels-Alder (DA) cycloaddition of conjugated dienes onto the sidewalls of single-wall carbon nanotubes is assessed by means of a two-layered ONIOM(B3LYP/6-31G:AM1) approach. Whereas the DA reaction of 1,3-butadiene on the sidewall of an armchair (5,5) nanotube is found to be…