Materials Literature
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The effects of complexed metal ions on trans − cis photoisomerization reactions of two azobenzene compounds having a crown ether ring, 1a (small ring) and 1b (large ring) were investigated. The photoisomerization of 2,2‘-dimethoxyazobenzene ( 2 ) was compared as a control. Anomalous increase in the quantum yields of t…
The microscopic dynamics of several monomeric and polymeric glass-forming materials has been investigated by time-resolved fluorescence measurements of doped malachite green molecules in a wide temperature region. For monomers, 1-propanol, propylene glycol, and glycerol, and a polymer without side chains, poly- butadi…
Variation with time of the chemically active three‐phase boundary, due to the spontaneous sintering of metal particles, is simulated with the help of a correlated percolation model. Different modes of variation are obtained depending on the relative composition and porosity and the conditions of sintering. They range…
The longitudinal electromechanical coupling factor ( k 33 ) was investigated as a function of PbNi 1/3 Nb 2/3 O 3 – PbTiO 3 –PbZrO 3 (PNN-PT-PZ) piezoelectric ceramic compositions close to the morphotropic phase boundary (MPB). The k 33 was influenced by the grain size of PNN-PT-PZ ceramics. The composition of the MPB…
Abstract 21 new organometallic complexes of the type M–Cn–M′ containing the building blocks M, M′ = (CO) 5 Cr, (CO) 5 Mo, (CO) 5 W, Cp(CO) 2 Mn, Cp(CO) 2 Fe, Cp(CO)(CN)Fe, Cp(dppe)Fe, Cp(PPh 3 ) 2 Ru, Cp(PPh 3 )Ni, and (PPh 3 ) 2 Ag were obtained from the reagents M–Cn and M–X (X = leaving group). Among them are five…
All articles of this category An approach for synthesis of 4- tert -butylcalix[4]arenes bearing two Schiff base units at the lower rim 4a-u in excellent yields is described. All 21 compounds 4a-u have been achieved by treatment of 1,3-distally substituent 4- tert -butylcalix[4]arene amine 3 with aromatic or heterocycl…
Abstract The catalytic isomerization reaction of α‐pinene to camphene over a clinoptilolite catalyst was investigated in a batch reactor open to the atmosphere between 130 and 155°C. The catalyst was selective to the isomerization of α‐pinene to camphene. The effects of several variables, such as reaction temperature,…
A study has been made of the density profile of mutually avoiding rod-like particles in the space between two parallel plates, held in equilibrium with a bulk phase of isotropic, semidilute rods, using a self-consistent integral equation which becomes exact as the rod aspect radio L/D → ∞. Computer simulation investig…
With a high-refractive-index mixed-oxide dielectric material of ZrTiO(4) and ZrO(2) [Substance H2 (Sub2) from E. Merck, Darmstadt, Germany], in combination with magnesium flouride (MgF(2)), design optimization and experimental production of low-loss antireflection (AR) coatings are carried out. Design-optimization stu…
The crystal structures of heat‐treated electrolytic manganese dioxide (HEMD) and the discharge products are characterized by high‐spatial‐resolution convergent‐beam electron diffraction (CBED) and lattice imaging. In this paper, CBED results are used to clarify the ambiguity in the x‐ray diffraction (XRD) patterns of…
For the purpose of increasing the hydrophilicity of a polylactide, a new monomer, (3 S )-3-[(benzyloxycarbonyl)methyl]morpholine-2,5-dione, was successfully polymerized. The benzyl protective group of the polymer was completely removed to give poly(glycolic acid- alt - l -aspartic acid). The structures and properties…
Stannous‐lead phosphorus oxynitride (Sn‐Pb‐P‐O‐N) glasses were prepared by remelting under an anhydrous ammonia atmosphere. Glasses that contained up to ∼4.2 wt% (9 at.%) of nitrogen were obtained. The rate of nitrogen dissolution was studied as a function of remelting time (3–66 h) and temperature (400°–600°C). The o…
Abstract A modified CaCO 3 sorbent with an open internal pore structure is prepared and its sulfation characteristics are investigated in an entrained flow reactor at high temperatures (900‐1,100°C) and short contact times (20–600 ms) using small particle sizes (< 5 μm). The most distinguishing feature of this modi…
The functional role of previously identified calcium binding residues in alpha-lactalbumin (alpha-LA) was investigated by site-directed mutagenesis. Mutation of D82 to alanine did not effect the binding affinity for calcium, the protein structure, or its function in the lactose synthase assay, suggesting that this asp…
Future nanotechnology applications are likely to involve reactive or non-reactive species carried along a fluid stream. We have performed several molecular dynamics simulations of a buckyball, , cage or idealized atom in a helium fluid flowing axially inside a carbon nanotube. The fluid was started at some initial vel…
The usefulness of dimethyl-, diethyl-, dibutyl- and dioctyltin oxide for the preparation of syndiotactic poly(β- d, l -butyrolactone) was studied. Most polymerizations were conducted in bulk and a few polymerizations in toluene or chlorobenzene. The reaction temperature was varied between 50 and 100 °C. Below 50 °C th…
Cascade-branched, “graft on graft” polybutadienes, denoted arborescent graft polymers, were prepared by hydrosilylation of polybutadiene vinyl groups with chlorodimethylsilane, followed by grafting with living polybutadiene chains. Repeated hydrosilylation−anionic grafting cycles led to a treelike outward growth, yiel…
Gilbert's damping constants, α , of Co-Cr-Ta and Co-Cr-Pt thin films are determined by Q-band FMR analysis using single crystal magnetic thin films epitaxialIy grown on MgO(110) substrates. α is calculated from the resonance width of the FMR spectrum. α of Co77Cr19Ta4is found to increase from 0.016 to 0.028 as magneti…
Abstract Shell‐crosslinked knedels are nanometer‐sized (5–200 nm diameters), amphiphilic core‐shell spheres that are prepared by the self‐assembly of amphiphilic block copolymers into polymer micelles, followed by crosslinking of side chain functionalities along the block composing the shell of the polymer micelles. S…
Models for predicting ring or rotor yarn hairiness are built using a back-propagation neural network algorithm. These models are based on fiber property input measured by three different systems, hvi, afis, and fmt. We compare the prediction results from the different models, which reveal that yarn hairiness measureme…