Materials Literature
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Abstract Muscovite-kaolinite intergrowths found in Albian sandstones of the Basque Cantabrian basin (northern Spain) were studied by optical, scanning and electron microscopy and electron microprobe analysis. Kaolinitization begins at grain edges, forming the characteristic fanned-out textures, and propagates toward t…
A new and general synthetic strategy for thiophene-based condensed aromatics(see Figure) is described. A tandem cyclization scheme produces aromatized monomers in situ, prior to oxidative polymerization. The poly(naphthodithiophene)s are a family of highly stable and polarizable scaffolds whose polymer backbone energe…
Abstract A novel spin crossover Fe(III) complex, [Fe(H3L)](ClO4)3·(4-fim)·H2O (H3L = tris[2-(((imidazol-4-yl)methylene)amino)ethyl]amine, 4-fim = 4-formylimidazole), was synthesized and the crystal structure was determined at 293 K. Cryomagnetic measurements revealed a two-step spin conversion and a pressure induced s…
Well-ordered Georgia kaolinite (Kga-1b) obtained from the source Clay Repository of the Clay Minerals Society (USA) was intercalated with urea using grinding procedures. To achieve complete intercalation 20% of urea (in weight) was used, producing Al2Si2O5(OH)4 (N2H4CO)0,86 with an interplanar basal spacing of 1,08nm.…
Abstract Mechanical properties and morphologies of nylon 11/ethylene‐octene copolymer blends have been investigated. The ethylene‐octene copolymer (POE) employed in this study was grafted with maleic anhydride (MAH) and thus has the potential to react with the amine group of nylon 11. Nylon 11/POE‐g‐MAH and nylon 11/P…
The effect of the addition of Bi 2 O 3 on the densification, low‐temperature sintering, and electromagnetic properties of Z‐type planar hexaferrite was investigated. The results show that Bi 2 O 3 additives can improve the densification and promote low‐temperature sintering of Z‐type hexaferrite prepared by a solid‐st…
The effects of divalent salts (CaCl 2, MgCl 2 and BaCl 2 ) in promoting the adsorption of weakly charged polyelectrolyte (polyacrylic acid), PAA, Mw ∼ 250000 g/mol) on mica surfaces and their role in tuning the nature of interactions between such adsorbed polyelectrolyte layers were studied using the interferometric s…
Die Verbindungen A8[Ta6O19] · n H2O (A = Rb, Cs; n = 0, 4, 14) enthalten das Isopolyanion [Ta6O19]8–, das aus sechs zu einem großen Oktaeder kantenverknüpften [TaO6]-Oktaedern besteht. Sie gehen – wie u. a. die thermoanalytischen Untersuchungen (TG/DSC) zeigen – durch reversible Hydratations/Dehydratationsprozesse ine…
An oriented gas model for the second-order nonlinear optical response for optical second-harmonic generation in axially aligned nonlinear optical chromophores in chiral media is presented. Design criteria for the alignment of chromophores possessing Kleinman-disallowed traceless symmetric second-rank tensor hyperpolar…
Abstract Supercritical carbon dioxide (scCO 2 ) was added during blending of polystyrene or poly(methyl‐methacrylate) (PMMA) and a rubber impact modifier (SP 2207). The resulting blend morphologies were compared. The compounding took place in a Leistritz ZSE‐27 twin‐screw extruder at 100 RPM, at a temperature of 200°C…
Abstract A precursor poly(amic acid) was obtained by solution polymerization of pyromellitic dianhydride and benzidine in N, N‐dimethylacetamide. Poly(amic acid)/Organoclay hybrids were prepared by the solution intercalation method with dodecylamine‐montmorillonite. A polyimide hybrid was obtained from poly(amic acid)…
A broadband dielectric study of the dispersions of silica spheres (Aerosil 380) in octylcyanobiphenyl (8CB) with densities between 0.083 and 10 g of silica per 1 cm 3 of liquid crystal (LC) is reported. High values of silica densities were achieved for the first time to observe the behaviour of the LC monolayer on the…
The synthesis and characterization of the new aromatic ortho-dithiol, 4,5-dicyanobenzene-1,2-dithiol (3) is reported. This compound was used to prepare tetrabutylammonium salts of novel nickel complexes; the nickel(II) salt (nBu4N)2[Ni(dcbdt)2] (4), the nickel(III) salt (nBu4N)2[Ni(dcbdt)2]2 (5), and the partially oxi…
A chitin-based graft copolymer, chitin-graft-oligo(ε-caprolactone) (2), was synthesized via ring-opening graft polymerization of (ε-caprolactone (ε-CL) to ca. 50% partially deacetylated chitin 1 catalyzed by tin(II) 2-ethylhexanoate in the presence of water as a swelling agent. The graft copolymer with ca. 40 wt.-% po…
This paper shows that the dielectric anisotropy of conductivity in cells composed of nematic liquid crystal E7 (NLC-E7) is related to the fact that the diffusion constant (D) is greater in a cell with homeotropic alignment than in one with homogeneous alignment (D ∥ > D ⊥). This behaviour can be understood by the stud…
The potential of a new anode cermet based on Cu and titania doped yttria stabilized zirconia (YZT) for high temperature fuel cells was examined. Cermets were prepared by a standard solid-state reaction using Y0.2Ti0.18Zr0.62O1.9 and CuO as starting materials. Green pellets were sintered at 1000 °C for 10 hours resulti…
Traditional approaches for macromolecular structure elucidation, including NMR, crystallography and cryo-EM have made significant progress in defining the structures of protein-protein complexes. A substantial number of macromolecular structures, however, have not been examined with atomic detail due to sample size an…
We have prepared and fully characterized by means of multinuclear NMR and UV-vis spectroscopy a series of pyridoneimines and pyridonemethides in order to show how it is possible to finely tune pi-electron structure properties by properly exploiting substituent and solvent effects. Substituents with different electron-…
Nanocrystalline zirconia with a grain size of ∼5 nm was surface‐doped with 3 and 30 mol% alumina by chemical vapor synthesis using two sequential hot‐wall reactors. The powders were characterized by high‐resolution transmission electron microscopy, X‐ray diffractometry (XRD), and nitrogen adsorption. Aqueous dispersio…
Nucleating agents are used in semi-crystalline polymer systems (mainly polyolefins) to increase the rate of crystallization. These agents increase degree of crystallinity and lamellae thickness and, hence, improve stiffness and strength. In addition to altered mechanical characteristics, clarifying agents do also impr…