Materials Literature
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We present an approach to fabricate solid capsules with precise control of size, permeability, mechanical strength, and compatibility. The capsules are fabricated by the self-assembly of colloidal particles onto the interface of emulsion droplets. After the particles are locked together to form elastic shells, the emu…
The low-temperature behavior of imperfect crystals like KCl with a few ppm of substitutional defects like ${\mathrm{OH}}^{\ensuremath{-}}$ or ${\mathrm{Li}}^{+}$ is dominated by the dynamics of these defects. At low concentrations the defects are usually described as isolated systems. We find that in typical experimen…
The frequency (100Hz–1MHz) and temperature (30–575°C) dependence of electrical properties of calcium doped (Ca = 0.01, 0.05, 0.1) sodium bismuth titanate (NBT) was investigated by impedance spectroscopy. The data is used to analyze the effect of calcium concentration on the electrical properties of NBT. The frequency…
Metallopolymers offer interesting opportunities for the formation of materials with potential applications in electronics and photonics. Polyferrocenylsilanes are a class of main-chain metal-containing polymers prepared in our group via a ring-opening polymerization route more than a decade ago. The materials are easy…
A general quasianalytic space-time averaged kinetic model for studying the nonequilibrium plasma chemistry of medium-pressure (0.1 Torr⩽ p ⩽0.8 Torr) C 2 H 2 (1%)/H 2 /Ar radiofrequency (RF) (13.56 MHz) plasmas has been built and used for determining simple analytic expressions for the concentrations of some species o…
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…