Materials Literature
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Abstract Polymeric foams are widely used both as structural and as thermal insulating material. Few detailed data about the process of foam growth are reported in the literature, especially for recently developed polyurethane formulations that involve the use of a volatile organic compound instead of the banned chloro…
The coordination structure and reactivities of metal ligands in metal-sensing metalloregulatory coordination complexes may well dictate their biological properties. Here, we use the technique of ratiometric pulsed alkylation mass spectrometry (rPA-MS) to probe the structure and reactivities of metal coordination compl…
Abstract Titanium‐based catalysts for poly(alkylene terephthalate) synthesis have been known for many years. Up to now, organotitanate compounds are used as catalysts on an industrial scale only for the synthesis of poly(butylene terephthalate) (PBT), poly(trimethylene terephthalate) (PTT), and related copolyesters; f…
Silver atoms and strongly interlinking Keggin units ensure the tridimensionnal macrocationic structure of [Ag(6)(PMo(10)V(2)O(40))](CH(3)COO).8H(2)O, which catalyzes O(2)-based oxidation of p-methoxytoluene in acetic acid by air.
We explore the dynamics of viscous propylene glycol (PG) near its glass transition for the case of soft spatial confinement. The supercooled liquid is geometrically restricted by the reverse micelles of a glass-forming PG/AOT/decalin microemulsion, with the intramicellar dynamics being probed by triplet state solvatio…
We report here on the electronic structure of electron-doped half-metallic ferromagnetic perovskites such as ${\mathrm{Sr}}_{2\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{FeMoO}}_{6}$ $(x=0\ensuremath{-}0.6)$ as obtained from high-resolved valence-band photoemission spectroscopy (PES). By comparing the PES spectra with b…
Reaction of iron salts with three tripodal imidazole ligands, H(3)(1), H(3)(2), H(3)(3), formed from the condensation of tris(2-aminoethyl)amine (tren) with 3 equiv of an imidazole carboxaldehyde yielded eight new cationic iron(III) and iron(II), [FeH(3)L](3+or2+), and neutral iron(III), FeL, complexes. All complexes…
Abstract This review describes the various types and synthetic strategies for the production of siloxanes. A description is given of the various synthetic methods for the production of organic compounds with silicon–oxygen bonds. The different types of siloxane are described, with the emphasis being on their structura…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTDistribution of Shish-Kebab Structure of Isotactic Polypropylene under Shear in the Presence of Nucleating AgentPeng-wei Zhu and Graham EdwardView Author Information School of Physics and Materials Engineering and CRC for Polymers, Monash University, Clayton, Vic 3800, Australi…
Abstract Poly(ε‐caprolactone) (PCL) chains grafted onto montmorillonite modified by a mixture of nonfunctional ammonium salts and ammonium‐bearing hydroxyl groups were prepared. The clay content was fixed to 3 wt %, whereas the hydroxyl functionality was 25, 50, 75, and 100%, obtaining an intercalated or exfoliated sy…
Two models of catalytic monolith reactor with diffusion in the washcoat are described, employing the nonstationary kinetics of CO and hydrocarbon oxidation, NO x reduction, and oxygen storage with 23 reaction steps. The first model describes the dynamic behavior in a short monolith (recirculation reactor or CSTR), and…
Orbital ordering leads to an unconventional excitation spectrum that we investigate by resonance Raman scattering using incident photon energies between 1.7 and 5.0 eV. We use spectral ellipsometry to determine the corresponding dielectric function. Our results show resonant behavior of the phonon Raman cross section…
A novel photocontrollable magnetic thin film consisting of amphiphilic azobenzene cations, a smectite clay, and Prussian Blue has been designed and prepared by using the Langmuir−Blodgett method and an ion-exchange reaction. This magnetic thin film possesses a well-organized nanoscale layered structure. Reversible pho…
The ability to control the transformation process between polymorphs of crystalline materials is critical to ensure that the correct form is produced, and hence it is essential to learn which experimental factors affect this transformation reaction. In this contribution, the kinetics of the polymorphic transformation…
Synthesis of a highly ordered, two-dimensional hexagonal ( P 6 mm ) mesoporous benzene−silica composite having molecular-scale periodicity in the pore wall from the self-assembly of nonlinear symmetric 1,3-bis(triethoxysilyl)benzene and octadecyltrimethylammonium surfactant is described. The synthesis of hybrid organo…
Results from different sets of band calculations for undoped and doped HgBa$_2$CuO$_4$ show that small changes in localization can lead to very different ground states. The normal LDA results are compared with 'modified' LDA results, in which different linearization energies make the O-p band more localized. The groun…
Recent data from angle-resolved photoemission experiments published by Zhou et al. [Nature, Vol. 423, 398 (2003)] concerning a number of hole-doped copper-oxide-based high-temperature superconductors reveal that in the nodal directions of the underlying square Brillouin zones (i.e. the directions along which the d-wav…
We present a study of the dielectric function of metallic (III,Mn)V diluted magnetic semiconductors in the infrared regime. Our theoretical approach is based on the kinetic exchange model for carrier induced (III,Mn)V ferromagnetism. The dielectric function is calculated within the random phase approximation and, with…
We present electrical measurements of high-frequency magnetic dynamics excited by spin-polarized currents in Co/Cu/Ni80Fe20 nanopillar devices, with a magnetic field applied perpendicular to the sample layers. As a function of current and magnetic field, the dynamical phase diagram contains several distinguishable pre…
We present results from extensive numerical integration of the KPZ equation in $1 + 1$ dimensions aimed to check the long-time behavior of the dynamical structure factor of that system. Over a number of decades in the size of the structure factor we confirm scaling and stretched exponential decay. We also give an anal…