Materials Literature
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Irradiation of a hexane/THF solution of Mn 2 (CO) 10, 3,6-di- tert -butyl-1,2-benzoquinone, and pyrazine has been used to prepare the linear [ trans -Mn(μ-pyz)(3,6-DBQ) 2 ] n polymer. Structural characterization [monoclinic, C 2/ m, Z = 2, a = 20.148(5) Å, b = 7.547(1) Å, c = 14.156(2) Å, β = 112.23(2)°, V = 1992.5(6)…
Electron irradiation of 100% internal quantum efficiency silicon photodiodes having a thin (60 /spl Aring/) SiO/sub 2/ dead layer results in measured responsivities ranging from 0.056 A/W at an incident electron energy E/sub 0/=0.2 keV to 0.24 A/W at E/sub 0/=40 keV. By comparing the data to a Monte Carlo simulation o…
The phase transformations and the glass−liquid transition on heating of supercooled liquid triphenyl phosphite (TPP) were studied by differential scanning calorimetry and fixed frequency dielectrometry, and the nature of its various states was discussed. The dielectric behavior of the so-called “glacial” phase shows t…
Uniform cubic manganese carbonate, MnCO 3, particles of two modal sizes (∼0.8 and 8 μm) were produced by homogeneous precipitation from aqueous solutions of manganese sulfate and urea at elevated temperatures under limited experimental conditions. The larger particles were converted into Mn 2 O 3 and MnO on calcinatio…
Using a two-dimensional self-consistent field calculation and scaling theory, we investigate the interaction between two planar surfaces where: (1) each surface is grafted with both solvophilic and solvophobic homopolymers and (2) both surfaces are coated with solvophobic polyelectrolytes. The chains are tethered by o…
Oxygen permeation experiments were performed on dense mixed-conducting ceramic-metal composite membranes (thickness 0.2 to 2 mm) Bi1.5Er0.5O3-Ag with 10.0, 27.8, and 40.0 volume percent (v/o) silver, respectively, in the temperature range 873 to 993 K and oxygen partial pressure range 10–3.5 to 1 bar O2. The oxygen fl…
Five new compounds, which bring together two classical groups, Werner transition-metal hexaammine complexes and sulfosalts, have been prepared from supercritical ammonia. They form in two different structure types which are built from traditional octahedrally coordinated transition-metal hexaammine cations and anionic…
Abstract Vermiculite crystals from Santa Olalla, Spain, were intercalated with tetramethylammonium (TMA) after Na saturation. The resulting TMA-vermiculite showed near perfect 3-dimensional stacking order with cell parameters of a = 5.353(1) Å, b = 9.273(2) Å, c = 13.616(6) Å, β = 97.68(3)°, and space group C 2/ m , w…
ABSTRACT We studied how size variation in populations of Diatoma moniliformis Kütz. was influenced by environmental effects on the diatom life cycle. One of the two populations sampled monthly in the northern Baltic Sea grew under natural conditions; the other population was in a cooling water discharge channel of a n…
Abstract Isotaclic polypropylene (iPP) was nucleated specifically for structural and mechanical studies, especially of impact resistance. Nucleation was accomplished by two red pigments: a linear trans ‐quinacridone dye (as β‐phase nucleator) and a dimethyl quinacridone resulting in the formalion of a pure α‐phase str…
A technique for measuring the optical dispersion of small single-crystal specimens has been developed. A ceramic sample holder capable of holding eight specimens was used to prepare prisms from samples with thicknesses of 1–2 mm. By this technique, refractive indices of 50 synthetic oxide and 53 mineral crystals were…
The feasibility of using controlled, forced collapse of cavitation bubbles for improved stone fragmentation during shock wave lithotripsy was demonstrated using microsecond tandem shockwave pulses. High-speed photography revealed that a secondary shock wave, released in less than 500 microseconds (microsec.) following…
Described is the self-assembly of a monolayer of TiO 2 nanocrystallites on a gold substrate by two related methods. In the first of these methods, a crystalline monolayer of the functionalized thiol HS−(CH 2 ) 10 −COOH is self-assembled at an annealed gold substrate by adsorption from ethanolic solution. The modified…
Theoretical approach on the magnetoelectric effect in two-phase composite materials consisting of ferrite and piezoelectric components at various frequencies is developed. The mechanism responsible for the magnetoelectric effect is discussed. The generalised magnetoelectric sensitivity tensor is calculated. The estima…
Size control of polypyrrole particles prepared by chemical polymerization was achieved by varying the concentration of the oxidant in the presence of poly(styrenesulfonate). At higher concentrations, smaller polypyrrole particles are formed. Poly(styrenesulfonate) functions as a molecular template, causing local preco…
Tsalen- and tsalpn-based nickel complexes with aldehyde functionalities have been prepared (tsalen = N,N'-ethylenebis(thiosalicylideneaminato)(2-) and tsalpn = N,N'-propane-1,3-diyl(thiosalicylideneaminato)(2-)). One of the complexes has been structurally characterized: Ni(pftp) (pftp = N,N-ethylene(6-formyl-4-methyl-…
Summary The transformations of phyllosilicates and the changes in potassium (K) balances caused by long‐term cropping have been examined in soil from the 153‐year‐old Broadbalk experiment. Samples taken between 1856 and 1987 and kept in archive were fractionated for particle size and analysed for changes in mineralogy…
Using newly developed theoretical methods, we present preliminary results for some calculated properties of the cyclic peptide system cyclo[( d -Ala-Glu- d -Ala-Gln) m = 1 - 4 ]. These calculations are motivated by the fact that the cyclo[( d -Ala-Glu- d -Ala-Gln) 2 ] cyclic peptide structure was the first cyclic pept…
Adsorption measurements of CH 4 on catalytically produced carbon nanotubes were used to determine the wetting behavior of the films, the presence of capillary condensation, and the specific surface area of the tubes. Two groups of carbon tubes were produced. The set of larger tubes had inner diameters on the order of…
The first compound for which the previously predicted biaxial nematic phase was claimed is 4-[3,4,5-tris(4-dodecyloxybenzyloxy)benzoyloxy]-4′-(4-dodecyloxybenzoyloxy)-1,1′-biphenyl (I). This assignment was based on the observation of the optical texture and the x-ray diffraction pattern. To confirm this identification…