Materials Literature
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MgIn 2 O 4- X thin films were deposited onto a silica glass plate by the RF sputtering method. The highest conductivity observed for the film post-annealed under H 2 flow was 2.3×10 2 S/cm, with a carrier concentration of 6.3×10 20 cm -3 and a mobility of 2.2 cm 2 ·V -1 ·s -1 . No distinct optical absorption band was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst reversible electrogeneration of triply oxidized nickel porphyrins and porphycenes. Formation of nickel(III) .pi. dicationsKarl M. Kadish, Eric Van Caemelbecke, Pierre Boulas, Francis D'Souza, Emanuel Vogel, Michael Kisters, Craig J. Medforth, and Kevin M. SmithCite thi…
A new nondestructive readout method was proposed for photochromic rewritable memory media. When the medium has a thermal threshold in the writing process with a λ 1 laser, reading using two lasers having emission lines at λ 1 and λ 2 , which correspond to absorption bands of the two isomers, makes it possible to keep…
Thermal degradation behaviors for homo- and copolymers of methacrylates prepared by stereospecific living polymerizations as well as radical polymerization were studied. Thermal stability of radically prepared PMMAs can be improved by careful control of end groups and by incorporation of methyl acrylate into the chain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon aerogel composite electrodesJoseph. Wang, Lucio. Angnes, Haim. Tobias, Rebecca A. Roesner, Keith C. Hong, Robert S. Glass, Fung Ming. Kong, and Richard W. PekalaCite this: Anal. Chem. 1993, 65, 17, 2300–2303Publication Date (Print):September 1, 1993Publication History…
Abstract Polymer-protected Cu/Pd bimetallic colloids with different atomic ratio of Cu to Pd were successfully prepared by refluxing a glycol solution of hydroxide of copper and palladium in the presence of poly(N-vinyl-2-pyrrolidone). The TEM, XRD, AAS and UV-vis spectrum measurements indicate the formation of bimeta…
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…