Materials Literature
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All articles of this category Solid bases prepared by derivatisation of amorphous silica and hexagonal mesoporous silica with dimethylaminopropyl groups are good catalysts for Michael addition reactions. Of the prepared catalysts, those based on hexagonal mesoporous silica show particularly high activities. The sol-ge…
An analytical method is developed for the effective magnetostriction of magnetostrictive composites based on Green’s function technique. For an elastically isotropic composite of magnetostrictive and nonmagnetostrictive phases, the analytical results give explicit effective-medium approximate formulas for the effectiv…
Oxidation studies of hot‐pressed RE‐α‐sialons, RE x ‐Si 12‐4.5 x Al 4.5 x O 1.5 x N 16‐1.5 x (with x = 0.40 for RE = Nd, Sm, Yb; and x = 0.48 for RE = Y) were carried out in oxygen in a TG apparatus for ca. 20 h. Very good oxidation resistance was found for the Yb‐doped samples, with parabolic rate constants K p simil…
The reaction-induced phase separation in a blend of a commercial polysulfone (PSu) with diepoxide-cyclic anhydride monomers, was studied. The diepoxide was based on diglycidylether of bisphenol A (DGEBA) and the hardener was methyl tetrahydrophthalic anhydride (MTHPA), used in stoichiometric proportion. Benzyldimethyl…
Experiments using time-correlated photon counting and optical bandpass filters measure new features in the time and spectral dependences of single-bubble sonoluminescence (SBSL). The SBSL full width at half maximum (FWHM) varies with wavelength at 3 \ifmmode^\circ\else\textdegree\fi{}C, but not at 24 \ifmmode^\circ\el…
We present an optimization-based synthesis algorithm for the design of diffractive optical elements (DOE’s) that are finite in extent, have subwavelength features, and are aperiodic. The subwavelength nature of the DOE’s precludes the use of scalar diffraction theory, and their finite extent and aperiodic nature preve…
A new photoluminescent material has been synthesized by the interaction of (3-aminopropyl)triethoxysilane with acetic acid under oxygen-free conditions. The photophysical properties of this material in bulk form, colloidal solution, and thin films have been studied by absorption, excitation, steady-state fluorescence,…
Coulomb blockade (CB) was observed in Al/aluminum oxide/Ni nanowire single-junction arrays fabricated by electrochemical deposition of Ni into porous aluminum oxide nanotemplates. The bias dependence of the tunneling current and the temperature dependence of the zero-bias anomalies observed in the tunneling spectra ar…
The reduction of [N(octyl) 4 ] 2 [CuCl 2 Br 2 ] in organic solution (toluene) using Li[BEt 3 H] leads to colloidal Cu protected by cationic surfactants (NR 4 + ). According to HRTEM (high-resolution transmission electron microscopy) and UV/vis data, the organosol is composed of relatively large Cu particles with diame…
cis-Biphenyl-2,3-dihydrodiol-2,3-dehydrogenase (BphB) is involved in the aerobic biodegradation of polychlorinated biphenyls (PCBs). The crystal structure of the NAD+-enzyme complex was determined by molecular replacement and refined to an R-value of 17.9% at 2.0 A. As a member of the short-chain alcohol dehydrogenase…
A model of strength degradation for ceramics subject to damage from contact with hard spheres is developed. Primary attention is focused on tough ceramics with heterogeneous microstructures which deform in a quasi‐plastic mode. Brief consideration is also given to ideally brittle ceramics which form classical ring cra…
Several photosensitive polyimide (PSPI) precursors were synthesised by the acid/base complexations of conventional poly(amic acid) precursors with photochemically cross-linkable 2-(dimethylamino)ethyl methacrylate. PSPIs in films were prepared from the photosensitive precursors by thermal imidisation, whereas the corr…
The new compounds N -phenyl-4,4‘-bipyridinium (PhQ + ), N -(4-acetylphenyl)-4,4‘-bipyridinium (4-AcPhQ + ), and N -(2,4-dinitrophenyl)-4,4‘-bipyridinium (2,4-DNPhQ + ), together with the known ligand N -methyl-4,4‘-bipyridinium (MeQ + ), have been used to prepare a series of Ru(II) complex salts trans -[Ru(NH 3 ) 4 (L…
Single-crystal Ni2MnGa shows a nearly 0.2% strain under a magnetic field of 8 kOe at −8 °C. Polycrystalline samples have been prepared near stoichiometry to study the composition dependence of the magnetic and elastic properties. A narrow band of compositions has been found having a range of Curie and martensitic tran…
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Highly smooth and particulate free relatively thick polycrystalline La0.7Sr0.3MnO3 films out to 6 μm thick have been grown by shadowed pulse laser deposition at 30 Hz (248 nm, 500 mJ). Such films exhibited a low field and high field magnetoresistance as previously reported by a number of groups. Multilayer films made…
Hexagonal (Na 3/4 K 1/4 )AlGeO 4 crystallizes in the space group P 6 3 with unit-cell parameters a = 10.164 (2), c = 8.540 (2) Å and Z = 8 [ wR ( F 2 ) = 0.066 for all 3060 independent reflections]. Monoclinic (Na 3/4 K 1/4 )AlGeO 4 crystallizes in the space group P 2 1 with unit-cell parameters a = 10.0477 (4), b = 8…
We present a combined experimental and theoretical study of the formation of silicon hydride surface species during the F2 laser (157 nm) chemical vapor deposition of amorphous hydrogenated silicon (a-Si:H). A one-dimensional stochastic model has been applied to simulate the growing surface. The predictions of the mod…
The fabrication process of color filters produced with a series of new pigmented photoresists (CX513RGB) and their performance are described. The novel resist materials offer excellent contrast, good film uniformity and a stable shelf life exceeding 6 months, which was achieved by optimization of the amount and the mo…
We present a model for the propagation of optical beams in a nematic droplet. For a low intensity electromagnetic field, we first derive an analytical asymptotic expression for the configuration of a nematic droplet that satisfies hard-anchoring, bipolar boundary conditions. Then, from Maxwell's equation, we find the…