Materials Literature
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The light-induced high-spin-->low-spin relaxation for the Fe(II) spin-crossover compounds [Fe(btpa)](PF6)2 and [Fe(b(bdpa))](PF6)2 in solution, where btpa is the potentially octadentate ligand N,N,N',N'-tetrakis(2-pyridylmethyl)-6,6'-bis(aminomethyl)-2,2'-bipyridine and b(bdpa) is the analogous hexadentate ligand N,N'…
Synthesis of hexacelsian barium aluminosilicate (BaAl 2 Si 2 O 8 or BAS) from BaCO 3 , Al 2 O 3 , and amorphous SiO 2 was examined. BaCO 3 can react with SiO 2 and Al 2 O 3 to form barium silicates (Ba 2 SiO 4 or B 2 S, BaSiO 3 or BS, and BaSi 2 O 5 or BS 2 ) and barium aluminate (BaAl 2 O 4 or BA). It is shown that t…
A tape‐casting process was used to prepare various Al 2 O 3 –TiC green tapes, from which laminated and functionally gradient Al 2 O 3 –TiC materials (FGM Al 2 O 3 –TiC) were produced by cutting, stacking, and laminating the material, removing the binder, and hot‐pressing the green bodies. The bending strength of the F…
Delta(5)-3-Ketosteroid isomerase catalyzes cleavage and formation of a C-H bond at a diffusion-controlled limit. By determining the crystal structures of the enzyme in complex with each of three different inhibitors and by nuclear magnetic resonance (NMR) spectroscopic investigation, we evidenced the ionization of a h…
Silver and its alloys frequently are used as electrode material for BaTiO 3 ‐based dielectrics. In the present study, a small amount of fine silver particles have been intimately mixed with BaTiO 3 powder. The sintering and grain‐growth behavior of the silver‐doped BaTiO 3 in air are investigated. The solubility of si…
Single-wall carbon nanotubes (SWNTs) were applied to electron emitters of field-emission displays (FEDs). Large-area FED devices with SWNT emitters were successfully fabricated in a diode mode using screen printing to demonstrate moving color images. They revealed excellent field-emission characteristics of a threshol…
The title compound has been synthesized as the first oligothiophenophane that has the typical stacking structure of a layered cyclophane and can behave as an ideal pi-dimer model.
Aurophilicity has been a topic of immense interest and has played an important role in multinuclear gold(I) chemistry. Several polynuclear gold(I) chalcogenido, amido, and mixed-metal complexes have been reported very recently which might give new insights into the strategies for the construction of multinuclear gold(…
Abstract The crystal structures of synthetic Pb 3 O 2 (CO 3 ) and NaPb 2 (OH)(CO 3 ) 2 , have been solved by direct methods and refined to R = 0.062 and 0.024, respectively. Pb 3 O 2 (CO 3 ) is orthorhombic, Pnma, a = 22.194(3), b = 9.108(1), c = 5.7405(8) Å, V = 1160.4(3) Å 3 , Z = 8. There are four symmetrically dis…
Summary Low‐activity clay soils on old planation surfaces of the tropics are generally considered as stable end points of soil formation. It is therefore surprising to find Andisols on them. We characterized the properties of six profiles representative of these soils in the western part of the Nilgiri Hills (2000–250…
Biofilms, accumulations of microorganisms at interfaces, have been described for every aqueous system supporting life. The structure of these microbial communities ranges from monolayers of scattered single cells to thick, mucous structures of macroscopic dimensions (microbial mats; algal-microbial associations; trick…
A model for woven fabric behavior in bending is formulated based on a representation of fabric deformation as a coordinate transformation. The model is essentially based on previously published assumptions of yarn behavior but provides predictions closer to real fabric properties. It uses the energy approach for mecha…
Fossil marine diatom assemblages from the Sørsdal Formation, a deposit of diatomaceous sand from Marine Plain in the Vestfold Hills, provide age and palaeoenvironmental information from a Pliocene coastal setting in East Antarctica. Benthic and meroplanktic diatom taxa suggest deposition in a shallow coastal embayment…
The results of magnetization, electrical resistivity, and magnetoresistance measurements for two different directions on single crystalline ${\mathrm{Tb}}_{2}{\mathrm{PdSi}}_{3}$ are presented. The magnetic properties including magnetoresistance and the magnetic coupling are found to be strongly anisotropic with featu…
The crystal structure of a radiation-damaged natural zircon, ZrSiO(4) (alpha-decay radiation dose is ca 1.8 x 10(18) alpha-decay events g(-1)), has been determined. The anisotropic unit-cell swelling observed in the early stages of the amorphization process (0.17% along the a axis and 0.62% along the c axis compared w…
A procedure has been developed which utilizes aminopropyltriethoxysilane (APS) as the catalyst and a comonomer in the production of hybrid organo‐silica nanoparticles. Particles ranging from ca. 100 to 500 nm can be prepared using organo‐silanes of the type R′Si(OR) 3 , where R′= Me, vinyl, allyl, or other hydrophobic…
Transparent conducting films comprised of ZnO and ZrO2, with ZrO2 content varying between 0 and 10 wt %, have been deposited using pulsed-laser deposition. These films have resistivities ranging between 5.4×10−4 and 5.6×10−2 Ω cm with an optical transparency of more than 85% for the 250–900-nm-wavelength range. For fi…
Phosphorus-containing dendrimers of first, second, and third generation with various peripheral functional groups and bearing a hydrolyzable Si(OEt) 3 group at the core have been prepared. Two synthetic routes were used: either the Si(OEt) 3 group was introduced from the start by reaction of (EtO) 3 Si(CH 2 ) 3 PPh 2…
X-ray diffraction analysis of protein structure is often limited by the availability of suitable crystals. However, the absence of single crystals need not present an insurmountable obstacle in protein crystallography any more than it does in materials science, where powder diffraction techniques have developed to the…
X-ray photon correlation spectroscopy and small-angle x-ray scattering measurements are applied to characterize the dynamics and structure of concentrated suspensions of charge-stabilized polystyrene latex spheres dispersed in glycerol, for volume fractions between 2.7% and 52%. The static structures of the suspension…