Materials Literature
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A broad tuning range is demonstrated in tunable DBR lasers with a novel superstructure grating (SSG). These SSG reflectors were fabricated by electron-beam lithography, and grating performance was evaluated by measuring the transmittance characteristics of a ridge-type SSG reflector. Incorporating this SSG reflector i…
Incoherent-inelastic-neutron-scattering studies were carried out on polyisobutylene, presumably the least-fragile polymeric glass former known so far. A fast dynamical process on a frequency scale of roughly 500 GHz is measured for temperatures higher than the glass transition essentially without being influenced by t…
The sol–gel transition in dilute gels of gelatin are studied by differential scanning calorimetry (DSC) and static light scattering techniques. The sol–gel phase diagram clearly shows the existence of an upper critical solution temperature in this system. In addition, the DSC data conclusively exhibits two more phase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,2-Phenylene-bridged diporphyrin linked with porphyrin monomer and pyromellitimide as a model for a photosynthetic reaction center: synthesis and photoinduced charge separationAtsuhiro Osuka, Satoshi Nakajima, Kazuhiro Maruyama, Noboru Mataga, Tsuyoshi Asahi, Iwao Yamazaki,…
Numerical values are derived for the elastic stress fields in spheres under conditions of quasi-static compression and free impact against plane targets. The results are relevant to the brittle fracture of spheres under compression and impact loading and allow some anomalies observed in indirect methods of tensile tes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of an octasubstituted phthalocyanine in dodecane solutionW. J. Schutte, M. Sluyters-Rehbach, and J. H. SluytersCite this: J. Phys. Chem. 1993, 97, 22, 6069–6073Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1…
Anionic templates such as NO and SCN− as well as H2O can direct the linking of VO polyhedra (octahedra, tetrahedra, square pyramids). What forms are “container compounds” with the template either in the central cavity, as seen in 1, or on the outside wall.
Silane dendrimers have potential for applications such as stable micelles, building blocks for nanotechnology, X‐ray beam scattering and cores for star‐branched polymers. The Figure shows a first generation silane dendrimer in which the unsaturated terminal groups (the starting points for the production of the second…
Previously ( Proc. R. Soc. Edinburgh122A, 317– 340, 1992) we established that solutions to problems of diffraction of light in a periodic structure behave analytically with respect to variations of the interface. We present an algorithm based on this observation for the numerical solution of the problem. The principal…
The three isozymes of isocitrate dehydrogenase in Saccharomyces cerevisiae differ in subunit structure, subcellular location, and cofactor specificity. The two mitochondrial isozymes, IDH and IDP1, are NAD- and NADP-specific, respectively. Several lines of evidence presented here confirm the importance of IDH to respi…
Several technologies have been reported for the synthesis of AlN. These are reviewed and described in detail. The processes are classified according to the principle of synthesis, and the AlN product characteristics for each method of synthesis are identified. Only two of the methods reported, direct nitridation and c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of the electron-withdrawing power of substituents on the electronic structure and reactivity in oxoiron(IV) porphyrin .pi.-cation radical complexesHiroshi FujiiCite this: J. Am. Chem. Soc. 1993, 115, 11, 4641–4648Publication Date (Print):June 1, 1993Publication Histo…
Strongly c-axis oriented Pb(ZrxTi1−x)O3 (PZT) thin films with tetragonal perovskite structure (0.45≤x≤0.52) were epitaxially grown on (100)Pt/(100)MgO substrates using metalorganic chemical vapor deposition. Film thickness could be varied by altering the growth time. The electrical properties of PZT thin films sharply…
The authors developed and evaluated a polymer as a contrast agent for magnetic resonance (MR) angiography. The agent consists of a monomethoxy ether of poly(ethylene glycol) covalently attached to poly(L-lysine) (PL), with PL serving as the carrier of gadolinium diethylenetriaminepentaacetic acid (DTPA). Immunogenicit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyaniline plasticized with 1-methyl-2-pyrrolidone: structure and doping behaviorShow An Chen and Hsun Tsing LeeCite this: Macromolecules 1993, 26, 13, 3254–3261Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational studies of lithium perchlorate in propylene carbonate solutionsD. Battisti, G. A. Nazri, B. Klassen, and R. ArocaCite this: J. Phys. Chem. 1993, 97, 22, 5826–5830Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue…
Polycrystalline SrTiO3 thin films having perovskite structure were prepared by the metallo-organic solution deposition technique on platinum coated silicon and bare silicon substrates. Crack free and crystalline films with uniform composition and thickness were fabricated by spinning and post deposition rapid thermal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStudies of organic di-, oligo-, and polyradicals by means of their bulk magnetic propertiesHiizu Iwamura and Noboru KogaCite this: Acc. Chem. Res. 1993, 26, 6, 346–351Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993…
The size dependence of the resonance Raman spectrum of CdS nanocrystals ranging in size from 10 to 70 Å radius has been studied. We find that while the lowest electronic excited state is coupled strongly to the lattice, this coupling decreases as the nanocrystal size is decreased. We demonstrate that the lifetime of t…
A general methodology is developed for determining the state of stress and the numerical value of the stresses from observed shifts and broadening of optical fluorescence lines. The method is based on the piezospectroscopic properties of single crystals. We present general relationships between the measured fluorescen…