Microporous Mixed Oxides—Catalysts with Tunable Surface Polarity
Abstract For corrigendum see DOI: 10.1002/anie.199628811
Materials Literature
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Synthesis and Structure of the Nanoclusters [Hg32Se14(SePh)36], [Cd32Se14(SePh)36‐(PPh3)4],[P(Et)2(Ph)C4H8OSiMe3]5‐ [Cd18I17(PSiMe3)12], and [N(Et)3C4H8OSiMe3]5[Cd18I17(PSiMe3)12]
Abstract For corrigendum see DOI: 10.1002/anie.199721271
Highly Selective Epoxidation Catalysts Derived from Intrazeolite Trimethyltriazacyclononane‐Manganese Complexes
Adsorption of a cyclic amine ligand into a Mn-exchanged faujasite zeolite results in the formation of the corresponding amine—Mn complexes in the cavities of the zeolite. These “amine—Mn zeolites” are novel catalysts for the highly selective epoxidation of numerous olefins with H2O2. A computer model of a possible cat…
Pinning/depinning of crack fronts in heterogeneous materials
The fatigue fracture surfaces of a metallic alloy, and the stress corrosion fracture surfaces of glass are investigated as a function of crack velocity. It is shown that in both cases, there are two fracture regimes, which have a well defined self-affine signature. At high enough length scales, the universal roughness…
Rheology and properties of EPDM/BR blends with or without a homogenizing agent or a coupling agent
Rheology, dynamic mechanical properties, mechanical properties, and morphology of ethylene–propylene–diene rubber/butadiene rubber (EPDM/BR) blends with or without a homogenizing agent or a coupling agent were investigated. AAHR (a mixture of aliphatic and aromatic hydrocarbon resins) was used as a coupling agent. The…
Bulk surface photografting process and its applications. I. Reactions and kinetics
A bulk surface photografting process which is conducted in the interface between two polymer films was designed and investigated. The bulk surface photografting is a highly efficient process. With this method, the surface of hydrophobic polymers can be made hydrophilic in less than 2 s and a grafted layer 5 μm thick c…
Kinetics and rheology characterization during curing of dicyanates
Reaction kinetics and viscosity rise of a liquid dicyanate ester monomer, 1,1-bis(4-cyana-tophenol)ethane, are characterized and fitted several models. Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC) are used to obtain the isothermal reaction kinetic data. The liquid dicyanat…
On the motion of a growth intergranular boundary with twin orientation in bicrystals of pure zinc
The regularities of the growth twin boundary behavior in Zn bicrystals under shear stress have been investigated. The aim of this work was to study the possibility of the movement of a growth twin boundary by the generation and motion of twinning dislocations. As former investigations have shown, a growth intergranula…
Thermoluminescence studies in YVO4: Yb3+
Recently, rare earth doped vanadates have been identified as potential successor to YAG crystals. Not much is known about the ionising radiation effect on the lasing and other properties of vanadates. Colour centres, defects, etc. formation by γ-ray irradiation in pure and Yb3+ doped YVO4, studied by thermoluminescenc…
Genesis, Characteristics and Taxonomic Classification of Some Red Soils in Bundelkhand Region of Uttar Pradesh
Morphology and other characteristics of six typical pedons formed on sandstone, shale, granite and colluvium representing different landforms of Banda district of Uttar Pradesh were studied. The soils are deep to very deep, excessively to well drained, reddish brown to red, mildly acidic, low to medium in CEC, medium…
Dielectric behaviour of nano-TiO2 bulks
Two kinds of nano-TiO2 samples, including nano-anatase and nano-rutile, were prepared by the hydrothermal method and the gas condensation method, respectively. Results of dielectric measurements are as follows: 1. Nano-TiO2 bulk samples (anatase and rutile) exhibit much higher dielectric constant than coarse-grain sam…
Ab initio core-level shifts in metallic alloys
Core-level shifts and core-hole screening effects in alloy formation are studied ``ab initio'' by constrained-density-functional total-energy calculations. For our case study, the ordered intermetallic alloy MgAu, final-state effects are essential to account for the experimental Mg 1s shift, while they are negligible…
Na0.5Bi0.5TiO3–K0.5Bi0.5TiO3 (NBT-KBT) system: A structural and electrical study
The study of the Na0.5Bi0.5TiO3–K0.5Bio0.5TiO3 (NBT-KBT) system was carried out using X-ray diffraction and dielectric measurements. The limits of rhombohedral and orthorhombic solid solutions were determined, as well as the evolution of their lattice parameters as a function of composition and temperature. Dielectric…
<title>Electrophotographic performance of phthalocyanine pigment composites containing titanyl phthalocyanine</title>
Spectral sensitivity is an important consideration in photoconductor formulation, depending on the particular type of electrophotographic device in which the photoconductor is to be used. High sensitivity in both the near-IR and visible spectral regions would be desirable for a photoconductor used with a wide variety…
The birefringence of the optically nonlinear crystal 4-amino benzophenone
A precise method is presented for measuring the refractive index of an anisotropic prism with light polarized orthogonal to the prism axis which is also a dielectric axis. Prisms have been cut from crystals of the optically nonlinear 4-amino benzophenone with exceptionally low defect concentration as identified by syn…
Magnetic circular dichroism of Na3Nd(ODA)3⋅2NaClO4⋅6H2O
This paper emphasizes the complementarity between optical and magneto-optical measurements on f elements. The magnetic circular dichroism, circular dichroism, and polarized absorption spectra of Na3Nd(ODA)3⋅2NaClO4⋅6H2O (NdODA), have been recorded at 4.2 K between 5000 and 30 000 cm−1. The electric dipole contribution…
Ensemble-representable densities for atoms and molecules. II. Application to CoCl42?
In the previous article we introduced a method to obtain an ensemble density describing a molecule in a crystal from diffraction experiment structure factors. Here the method is applied to the CoCl42− molecular ion in a Cs3CoCl5 crystal for which accurate magnetic structure factors are known. First, the approximations…
Influence of Morphology on Film Formation of Acrylic Dispersions
Latex drying behaviour and (film) properties as minimum film forming temperature (MFT), dynamic mechanical behaviour, hardness and tensile strength have been compared, for latices prepared according to two stage emulsion polymerisation and by blending low and high Tg single stage latices. Compared to single stage coun…
ac-conductivity measurements onLa2NiO4+δ
We have carried out ac-conductivity \ensuremath{\sigma}(\ensuremath{\omega}) measurements on ${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4+\mathrm{\ensuremath{\delta}}}$,0\ensuremath{\leqslant}0.08, in the frequency (\ensuremath{\omega}) and temperature ranges 5 Hz--13 MHz and 75--300 K. The ac conductivity follows a set of b…
Optical activity of small-pitch helical-shaped dielectric media
A chiral smectic liquid crystal is considered, made of elongated molecules whose directions describe a helix along a given direction. It is shown that for small values of the helix pitch it behaves as a homogeneous medium which is optically active and uniaxial, with maximum rotatory power for light propagating orthogo…