Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium surface orientation of lamellaeG. T. Pickett, T. A. Witten, and S. R. NagelCite this: Macromolecules 1993, 26, 12, 3194–3199Publication Date (Print):June 1, 1993Publication History Published online1 May 2002Published inissue 1 June 1993https://pubs.acs.org/doi/10…
Ceramic/ceramic composites in the Ti‐B‐C system were fabricated by a novel process referred to as transient plastic phase processing (TPPP). The basic concept is based on the following reaction: “soft” transient plastic matrix + reactant phase → hard matrix + reinforcement phase where the transient plastic phase is a…
Relationships between diatom assemblages and physiocochemical factors were examined in 63 saline lakes in western North America. Sodium was the overwhelmingly dominant cation in the lakes examined; lakes above 47° latitude were dominated by SO 4 — 2 , and lakes below 47° were dominated by CO 3 — 2 and Cl — 1 . This la…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn unusually weak intervalence transition in a very stable bis chelate analog of the ruthenium mixed-valent Creutz-Taube ion. UV/visible/near-IR and EPR spectroelectrochemistry of [(NH3)4Ru(.mu.-bptz)Ru(NH3)4]n+ (bptz = 3,6-bis(2-pyridyl)-1,2,4,5-tetrazine; n = 3 - 5)Juergen…
A critical problem in the study by Komori and Makishima about the microstructural characterization of general fiber assemblies is analyzed, and a modified approach is presented in this paper. The modified theory is able to predict satisfactorily such , parameters as the mean values of the number of fiber contacts and…
A comparative study of tetragonal (Y-TZP, 3 mol% Y 2 O 3 ) and cubic (CSZ, 15 mol% CaO) zirconia powder samples was carried out to learn about a possible structural origin of the superior ionic conductivity of TZP at low temperatures. Structure refinements including anharmonic temperature factors and oxygen occupancie…
Abstract Unter den Nichtmetallnitriden sind vor allem die polymer aufgebauten binären Verbindungen BN und Si 3 N 4 für die Entwicklung von Werkstoffen für Hochleistungsanwendungen von Interesse. Herausragende Merkmale beider Substanzen sind ihre thermische, mechanische und chemische Beständigkeit bei gleichzeitig geri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman scattering (SERS) for semiconductor microcrystallites observed in silver-cadmium sulfide hybrid particlesI. Honma, T. Sano, and H. KomiyamaCite this: J. Phys. Chem. 1993, 97, 25, 6692–6695Publication Date (Print):June 1, 1993Publication History Publish…
Abstract The conversion of smectite to illite has been studied in buried bentonites and shales of the East Slovak Neogene Basin, using X-ray diffraction analysis and transmission electron microscopy. A good correlation was observed in both rock types between the content of expandable layers in interstratified illite-s…
Abstract Dried samples of polyacrylamide in an He atmosphere have been subjected to thermogravimetric analysis in the 30–600°C range, and the evolved gases were monitored by FTIR. Water, ammonia, and small quantities of carbon dioxide are released in the first stages of decomposition (220–340°C), where the polymer cha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(aniline-co-o-anisidine). A processable conducting copolymerS. S. Pandey, S. Annapoorni, and B. D. MalhotraCite this: Macromolecules 1993, 26, 12, 3190–3193Publication Date (Print):June 1, 1993Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight dependence and end-group effects on the surface tension of poly(dimethylsiloxane)Claire Jalbert, Jeffrey T. Koberstein, Iskender Yilgor, Paula Gallagher, and Val KrukonisCite this: Macromolecules 1993, 26, 12, 3069–3074Publication Date (Print):June 1, 1993Pu…
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…