Materials Literature
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Chemical vapor deposition (CVD) and electrochemical vapor deposition (EVD) have been applied to deposit yttria‐stabilized‐zirconia (YSZ) on porous ceramic media. The experimental results indicate that the location of YSZ deposition can be varied from the surface of the substrates to the inside of the substrates by cha…
The mixed alkali effect (MAE) in glasses has been investigated using molecular dynamics simulation. It has been established using Van Hove type correlation functions that alkali ions exhibit site preferences during migration. The occurrence of conductivity minimum has been demonstrated, and reasons for suppression of…
Dendrimeric Polyamines The dendritic amines 2, 3, 4 and the imine 6 are synthesized by a divergent strategy. The formerly problematic reduction of polynitriles is achieved by the use of diisobutylaluminium hydride in high yield. The functional imine dendrimer 6 is converted into its tricobalt complex 7 .
Subplantation of the noble-gas ions ${\mathrm{He}}^{+}$, ${\mathrm{Ne}}^{+}$, ${\mathrm{Ar}}^{+}$, and ${\mathrm{Kr}}^{+}$ into graphite in the energy range of 10--150 eV with doses in the range of 1--15\ifmmode\times\else\texttimes\fi{}${10}^{14}$ ions/${\mathrm{cm}}^{2}$ has been studied by Auger electron spectrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation behavior of sodium cholate in aqueous solutionA. Coello, F. Meijide, E. Rodriguez Nunez, and J. Vazquez TatoCite this: J. Phys. Chem. 1993, 97, 39, 10186–10191Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissu…
Advantages of solid‐state electrochemical devices are the ease of production, no possibility of leakage, and no electrolyte evaporation. One result of the search for such a device is the electrochromic display sketched in the Figure, which uses polyaniline and Prussian Blue as the active electrochromic materials and a…
The synthesis and characterization of a new meso-tetrapyridylporphyrin (TPyP) modified with four [Ru(bipy)2Cl]+ groups is reported. Cyclic voltammograms of this species in N,N′-dimethylformamide exhibit three reversible waves at 0.92, −0.68 and −0.93 V versus SHE, ascribed to the ruthenium(III/II) redox couple, and to…
The fibrous monolith microstructure consists of high aspect ratio polycrystalline cells of SiC separated by thin cell boundaries containing graphite. The SiC/100% graphite fibrous monolith has noncatastrophic fracture behavior, is damage tolerant, and is notch insensitive. The failure process is characterized by fract…
Very regularly aligned composite structures made of the two phases of a eutectic can be fabricated by unidirectional solidification of eutectics from the melt. A recent innovation is the use of chemical reactions taking place at the eutectic interface to produce new aligned composite materials. An example of this can…
Nitinol, a shape memory alloy, is flexible at low temperatures but retains its original shape when heated. This offers interesting possibilities for scoliosis correction. Of the shape memory alloys, nitinol is the most promising medically because of biocompatibility and the ability to control transition temperature. I…
The kinetic mechanism of the NADP-dependent isocitrate dehydrogenase of Escherichia coli was investigated using initial steady-state kinetic analyses. Kinetic coefficients, obtained using natural and alternative substrates with the wild-type and two mutant enzymes (S113L and S113N), suggest that the forward reaction […
A fracture mechanics model is presented for the toughening of ceramics by bridging from second‐phase particles, resulting in toughness curve ( T ‐curve) behavior. It is assumed that the second‐phase particles are in a state of residual thermal expansion dilatational mismatch relative to the matrix. In the long‐crack r…
Using a broadband mechanical spectrometer, the tensile modulus and stress relaxation of amorphous selenium were studied in the glass transformation range. Bimodal spectra were recorded under isothermal conditions in the time range ${10}^{\mathrm{\ensuremath{-}}1}$ st${10}^{5}$ s. It was found that the structural equil…
Bi 4 Ti 3 O 12 thin films were prepared on Pt/SiO 2 /Si(100), Pt/Ti/SiO 2 /Si(100) and sapphire (R-cut) by metalorganic chemical vapor deposition (MOCVD). Bi(C 6 H 5 ) 3 and Ti( i -OC 3 H 7 ) 4 were chosen as the metalorganic precursors. C -axis-oriented Bi 4 Ti 3 O 12 thin films were grown on Pt/SiO 2 /Si (100) at 55…
Automated docking of substrates to proteins of known structure aids the process of crystallographic analysis in two ways. First, automated docking can be used to generate a small number of starting models for substrates using only protein coordinates from an early stage of refinement. Second, automated docking provide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical vapor deposition of gallium sulfide: phase control by molecular designAndrew N. MacInnes, Michael B. Power, and Andrew R. BarronCite this: Chem. Mater. 1993, 5, 9, 1344–1351Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Publi…
Monolithic ceramics have been fabricated from coated green fibers to create fibrous microstructures. The fibrous monoliths consist of high aspect ratio polycrystalline regions (cells) of a primary phase regions (cell boundaries) designed to improve fracture resistance. The cells are the remnants of the green fiber whi…
Muon-spin-rotation and relaxation (\ensuremath{\mu}SR) studies of the organic compounds (TMTSF${)}_{2}$-X (X=${\mathrm{PF}}_{6}$, ${\mathrm{NO}}_{3}$, and ${\mathrm{ClO}}_{4}$) at ambient pressure are reported. We observe spin-density-wave (SDW) states in all three compounds under zero external magnetic field. The ons…
The repair process of the vascular endothelium is modulated by growth factors from both endogenous (within the vessel wall) and exogenous (blood borne) sources. We utilized a tissue culture model of endothelial wounding to gain further insight into the potential autocrine control of proliferation during wound repair.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRing-opening polymerization of optically active .beta.-butyrolactone using distannoxane catalysts: synthesis of high-molecular-weight poly(3-hydroxybutyrate)Yoji Hori, Motoki Suzuki, Akio Yamaguchi, and Takao NishishitaCite this: Macromolecules 1993, 26, 20, 5533–5534Publication…