Materials Literature
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On average 110 coupled metallocycles are present in an oligomer stack when the phthalocyaninatoiron complex 1, R1 R2 2-Et-C6H12, is allowed to react with benzene diisocyanide. This and other oligomers could be characterized by 57Fe-Mössbauer and NMR spectroscopy.
Abstract The shear modulus and loss of ca. 30% crystalline nylon‐12 have been measured over the temperature range 100–440 K and frequency range 10 −4 −1 Hz. The effect of water and physical aging of the amorphous regions on the relaxation spectra have been investigated. Absorbed water decreases both the temperature an…
The combination of porphyrin and acetylene chemistry leads to interesting novel molecules. This is illustrated by the synthesis of the first acetylene-cumulene-porphyrinoid 1, which can be regarded as a stretched porphycene.
Abstract The electrochemical properties of phenolic resin-based activated carbon fiber cloth (ACFC) in an aqueous electrolyte and in a nonaqueous organic electrolyte have been investigated. The differential electric double-layer capacitance of ACFC with the specific surface area of 1630 m2 g−1 in the aqueous electroly…
Hans Fischer's octaethylporphyrin (OEP) is so far the best available and most investigated of all synthetic porphyrins. The bisvinylogue OEP 1 has now been synthesized in high yields in a few steps. Owing to its chemical stability, good accessibility, and hitherto most intense UV/VIS absorption for an organic dye, thi…
La transformation de phase, qui s'etend sur plus de 600K, s'effectue en deux etapes. De faibles deplacements d'atomes, associes a des ellipsoides thermiques hautement anisotropes, indiquent un caractere displacif pour le debut de la transformation. Ensuite les deux structures restent presque inchangees, la transformat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlanar tetracoordinate carbon in zirconocene complex Cp2Zr(.mu.-.eta.1,.eta.2-Me3SiCCPh)(.mu.-Cl)AlMe2Gerhard Erker, Roland Zwettler, Carl Krueger, Ralf Noe, and Stefan WernerCite this: J. Am. Chem. Soc. 1990, 112, 26, 9620–9621Publication Date (Print):December 1, 1990Public…
Microwave plasma chemical vapor deposition was used to deposit diamond films on polished silicon and then the substrate was back-etched to form taut free-standing membranes up to 75 mm diam. Raman spectroscopy and x-ray diffraction verify that the films are diamond. Transmission electron microscopy and x-ray diffracti…
Chiral discotic liquid crystalline polymers are of interest because of their similarity to helical polymers, and for a comparison with chiral rod-shaped liquid crystals. They are now accessible in several forms, e.g. by doping achiral donor polymers with chiral acceptors (see Figure). The chirality of the discotic pha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron delocalization in molecule-bridged polymetallic systems. Unique neutral complexes of TCNE or TCNQ and up to four organometallic fragments (C5R5)(CO)2MnRenate Gross-Lannert, Wolfgang Kaim, and Barbara Olbrich-DeussnerCite this: Inorg. Chem. 1990, 29, 25, 5046–5053Pub…
In this symposium an attempt was made to cover all of the current research thrusts in this emerging field of research by inviting internationally-known authorities in the various subfields of this general topic. The major emphasis became the high temperature corrosion behavior in corrosive gases and molten liquids lar…
The dynamic problem is approximated by a time series of static analysis problems. An algorithm is described wherein in each time step the material properties of the target and the geometry of the deflection cone are derived.An experimental program was performed involving bullets fired at Kevlar 29 fabric targets.
For the isotopic blend of polystyrene (PS) PS/deutero PS (M=106 dalton), the Flory–Huggins interaction parameter χ(φ,T) was determined by means of the structure factor S(Q) measured by small angle neutron scattering (SANS). From χ(φ,T), the miscibility gap and the corresponding spinodal line was evaluated with a criti…
The theoretical aspects of magnetic resonance (MR) imaging contrast agents are reviewed, and their current applications to the central nervous system (CNS) and their future applications are discussed. Profound differences exist between contrast agents used for MR imaging and computerized tomography (CT). In MR imaging…
Neutron-diffraction experiments were performed in order to investigate the structure of the thermoelastic martensite of the ${\mathrm{Ni}}_{62.5}$${\mathrm{Al}}_{37.5}$ alloy. The following results were obtained: (i) the low-temperature phase has a seven-layered monoclinic unit cell (7M martensite). (ii) Anomalous shi…
A short review of acoustic properties of a number of disordered ferroelectric materials is made. In the first place such characteristics as velocity of ultrasound elastic waves and their attenuation in a phase transition range are discussed. We show that rather wide class of compounds (relaxators) can be identified as…
A sol‐gel process for the preparation of glass‐like cordierite and ceramic oxide powder is described. Metal alkoxide precursors were dissolved in 2‐methoxyethanol and the metal cations were complexed using 2,4‐pentanedione to overcome different hydrolysis rates of metal alkoxides which lead to microscopic inhomogeneit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of ternary polymer blends composed of three miscible binariesG. R. Brannock and D. R. PaulCite this: Macromolecules 1990, 23, 25, 5240–5250Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990h…
Bovine carbonic anhydrase B (CAB) is chosen as the model protein to study the phenomenon of protein aggregation, which often occurs during the refolding process. Refolding of CAB from 5 M GuHCl has been observed by quasi-elastic light scattering (QLS), which confirms the formation of a molten globular protein structur…
The existing underground transmission system in the United States is worth about $5 billion. To optimize the return on that investment and on further investment in the growing system, EPRI has sponsored research to develop periodic and continuous diagnostic procedures and methodologies for evaluating underground cable…