Materials Literature
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CuI-exchanged ZSM-5 contacted with N2 at room temperature or at 77 K exhibits a narrow IR band at 2295 cm–1. On the basis of 14N2/14N2 and 14N2/14N15N/15N2 isotopic substitution experiments this peak is assigned to the N—N stretching vibration of CuI—N2 end-on dinitrogen complexes formed on isolated CuI sites inside t…
Abstract A review is presented of recent experimental results of low temperature studies of composition driven metal-insulator transition in perovskite oxides of the ABO3 class. The evolution of physical properties like conductivity, tunnelling, density of states and magnetoconductivity has been studied at low tempera…
The continuous precipitation of the β b.c.c. phase in Mg-Al gives rise to elongated platelets which exhibit a Burgers orientation relationship and whose habit plane is parallel to the matrix basal plane. The habit plane is found to contain a periodic array of secondary edge dislocations. It is shown that the epitaxial…
After referring briefly to the earlier developments of computer-based PD measurements in the 1970s, the paper outlines how the introduction of new technology has resulted in the design and production of a number of digital systems for use in test laboratories and on site. In order to avoid overgeneralization, the basi…
The first synthesis of a porphyrin-2,3,12,13-tetraone and porphyrin-2,3,7,8-tetraones is reported; these compounds are useful compounds for the construction of laterally-extended porphyrin systems as is illustrated by the synthesis of linear and bent tris-porphyrins, 10 and 11, respectively, and the tetrakis-porphyrin…
MCM-41 is loaded with platinum via different pathways, resulting in highly active oxidation catalysts.
In order to understand better the drape phenomenon of fabrics, a non-linear finite-element code was developed and the three-dimensional drape shapes of a woven fabric were simulated by using the code. The woven fabric was assumed to be an elastic material with orthotropic anisotropy. The fabric was considered as a thi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Side-Chain Liquid Crystalline Homopolymers and Block Copolymers with Well-Defined Structures by Living Anionic Polymerization and Their Thermotropic Phase BehaviorMasayuki Yamada, Akira Hirao, Seiichi Nakahama, Tsukasa Iguchi, and Junji WatanabeCite this: Macrom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and Bond Energies of the Transition-Metal Carbonyls M(CO)5 (M = Fe, Ru, Os) and M(CO)4 (M = Ni, Pd, Pt)Andreas W. Ehlers and Gernot FrenkingCite this: Organometallics 1995, 14, 1, 423–426Publication Date (Print):January 1, 1995Publication History Published online1…
The effect of temperature on adsorption isotherms of cyclopentane on mesoporous MCM-41 molecular sieves with different pore size has been determined at 243–333 K. The occurrence of adsorption hysteresis upon capillary condensation in mesopores depends on the pore critical temperature, which is lower than the bulk crit…
The variation of the number and position of OH substituents at the phenyl ring of α-phenyl nitronyl nitroxide radicals yields different hydrogen-bonded molecular self-assemblies with distinct dimensionalities; the mono-ortho-substituted isomer is most remarkable since it shows a three-dimensional network of weak hydro…
Fluoropolymers modified by plasma modification were studied for their suitability as surfaces for the adhesion of cells. We compared films made by plasma modification of fluoroethylenepropylene (FEP) using nitrogen-containing gases (ammonia or dimethyl acetamide) with films deposited using oxygen-containing monomers (…
The partial substitution of Ce in CeO2 with isovalent elements like Hf and Zr greatly increases the overall activity of methane combustion measured as light-off and ignition temperature; the presence of a defective fluorite-structured oxide is recognized as a key factor in the activity enhancement.
The structural transformation from fcc to fct and relevant magnetic properties of initially multilayered Fe/Pt films were studied. When the as-deposited Fe/Pt films were annealed at the temperature of 300/spl deg/C and up, the fct-phase was formed. Rather square hysteresis loops and large coercivities were measured fr…
Thermodynamic phase equilibria of a polymer dispersed liquid crystal (PDLC) consisting of monomeric liquid crystals and a polymer have been investigated theoretically and experimentally. The equilibrium limits of phase separation as well as phase transition of a PDLC system were calculated by taking into consideration…
A mesoporous crystalline iron-containing MCM-41 molecular sieve is prepared by direct hydrothermal synthesis; XRD, framework IR, ESR, UV–VIS and solid-state 29Si MAS NMR spectroscopies provide evidence of iron(III) incorporation into framework positions.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Polypyrrole-Tin(IV) Oxide Nanocomposite ColloidsShuichi Maeda and Steven P. AmesCite this: Chem. Mater. 1995, 7, 1, 171–178Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 19…
Nanoparticles of Fe2O3 are encapsulated into the uniform pores of MCM-41 and the bandgap of the resulting Fe2O3particles is widened from 2.1 to 4.1 eV owing to the quantum size effect.
Mesoporous manganosilicate materials Mn-M41S, having hexagonal, cubic and lamellar structures, are synthesized with a low surfactant: Si ratio (0.12 : 1) at various temperatures and acid/base contents and are characterized by X-ray powder diffraction and Q-band EPR spectroscopy.
Abstract Simulations of the structure and dynamics of fluid films confined to a thickness of a few molecular diameters are described. Confining walls introduce layering and in‐plane order in the adjacent fluid. The latter is essential to transfer of shear stress. As the film thickness is decreased, by increasing press…