Materials Literature
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Infrared spectroscopy was used to monitor and characterize solutions used in the preparation of PZT 53/47 powders, dried gels, and thin layers deposited on platinized silicon substrates. It was found that careful control of the chemistry of the precursor solutions, in particular the control of the formation of esters…
Not an electronic circuit, but a chemical formula of a huge metal complex is depicted here. The circles stand for metal centers, the zigzags for bridging ligands, and the dashes for terminal ligands. The Ru22 complex, which belongs to the class of cascade compounds (arborols/dendrimers), is the largest Werner-type com…
Abstract The luminescence and excitation spectra of electronic excitations localized near a single anion vacancy (e α ), a divacancy (e d ), and a vacancy quartet (e q ) are investigated. The shifts of spectral characteristics of these excitations with respect to those of the excitations in regular lattice sites (e r…
A method for calculating the vibrational densities of states of crystalline materials by use of molecular dynamics (MD) is presented. It consists mainly of starting the calculation with all atoms at rest in their equilibrium positions, except one which is given an initial velocity; the time evolution of this velocity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer brushes in mixed solvents: chromatography and collapsePik Yin Lai and Avi HalperinCite this: Macromolecules 1992, 25, 24, 6693–6695Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs.acs…
Abstract Carbon black is the most important reinforcing filler for rubbers. The incorporation of carbon black into rubber vulcanizates generally gives improved strength, extensibility, fatigue resistance, abrasion resistance, etc. In order to exert its beneficial influence on the properties of rubber vulcanizates, the…
Reactions of trans-Ti(TMEDA)2Cl2 (TMEDA = N,A,N,N'-tetramethylethylenediamine) with 2 equiv of RONa IR = Ph, 3,5-(t-Bu)2C6H3] formed the paramagnetic light-green linear trimeric Ti(III) derivative Ti3(PhO)9-(TMEDA)2 (1) and the pink dimeric complex [Ti(RO)Cl(TMEDA)]2(mu-OR)2[R = 3,5-(t-Bu)2C6H3](2),respectively. Compl…
In compiling the space-group-frequency table of observed structures, retention of all the 230 space groups is advocated. This is based on some of the fundamental aspects of chirality. For cases both with space-group chirality (case A, e.g. P41, P43 etc.) and without (case B, e.g. P21, P212121), possible asymmetric dis…
The carbon concentration trapped in films of austenite between parallel platelets of bainite is often found to be much larger than that in the larger blocks of austenite between sheaves of bainite. The effect of this non-uniform distribution of carbon on the overall transformation kinetics of bainite is examined theor…
By varying the incident laser wavelength, the intrinsic Raman spectrum of porous silicon formed on nondegenerate p-type silicon is identified and used to determine the dependence of the average pore size and porosity on the depth of the porous silicon layer. It is found that with increasing layer depth, the average po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-spin tris(quinone oximates) of manganese(II,III). Synthesis, isomerism, and equilibriaPartha Basu and Animesh ChakravortyCite this: Inorg. Chem. 1992, 31, 24, 4980–4986Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissu…
Abstract Advances in polymer synthesis have made possible the polymerization of “starburst dendrimer” gels which are grown from a central initiator core through controlled branching reactions with a constant multiplication of the number of monomeric blocks from one generation to the next. The structure factor for such…
Recent void shrinkage models are reviewed and refined. The role of surface selfdiffusion is discussed for modelling void shrinkage by selfdiffusion along the void surface and bond interface. The refinement of the existing models makes it possible to discuss the effect of void crushing by power law creep, the validity…
A glutamic acid-specific protease has been purified to homogeneity from Bacillus licheniformis ATCC 14580 utilizing Phe-Leu-D-Glu-OMe-Sepharose affinity chromatography and crystallized. The molecular weight of the protease was estimated to be approximately 25,000 by SDS-polyacrylamide gel electrophoresis. This proteas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis and structural characterization of four layered vanadyl(IV) phosphate hydrates A(VO)2(PO4)2.cntdot.4H2O (A = Co, Ca, Sr, Pb)H. Y. Kang, W. C. Lee, S. L. Wang, and K. H. LiiCite this: Inorg. Chem. 1992, 31, 23, 4743–4748Publication Date (Print):November…
Strains of two types of methylotrophic bacteria, Paracoccus denitrificans and Methylobacterium extorquens, synthesized the copolyester poly(3-hydroxybutyrate-co-3-hydroxyvalerate) when methanol and n-amyl alcohol were added together to nitrogen-limited medium. The composition of the copolyester differed considerably b…
In order to investigate thermodynamic properties and microscopic structure around the crystal-smectic transition, we present constant-pressure molecular-dynamics simulations for soft parallel spherocylinders as a model for liquid crystals. The method of Andersen [J. Chem. Phys. 72, 2384 (1980)] as well as the method o…
Generally applicable techniques for surface analysis are described for prepared coating surfaces, with the recommendation that they be utilized prior to any fouling‐release field trials. The effectiveness of these techniques to predict nontoxic fouling‐release is supported by citation of results from the performance o…
Following the recent resolution of the longstanding problem of reconciling constant frequency nuclear-spin lattice relaxation (SLR) activation energies and d.c. conductivity activity energies in ion conducting glasses, we point out a new problem which seems not to have been discussed previously. We report conductivity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and processing of heterocyclic polymers as electronic, optoelectronic, and nonlinear optical materials. 1. New conjugated rigid-rod benzobisthiazole polymersJohn A. Osaheni and Samson A. JenekheCite this: Chem. Mater. 1992, 4, 6, 1282–1290Publication Date (Print):N…