Materials Literature
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Abstract The mechanical properties of Si 3 N 4 based ceramic bodies are largely controlled by the phases formed on the grain boundaries during sintering. For this reason determination of the state and the chemical composition of the surface of the starting Si 3 N 4 powder is of prime theoretial and practical importanc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEmission characteristics and photostability of N,N'-bis(2,5-di-tertbutylphenyl)-3,4:9,10-perylenebis(dicarboximide)El Zeiny M. Ebeid, Samy A. El-Daly, and Heinz LanghalsCite this: J. Phys. Chem. 1988, 92, 15, 4565–4568Publication Date (Print):July 1, 1988Publication History…
Abstract Regionally extensive, fine-grained dolostones from the Mississippian Burlington-Keokuk Fm. comprise two major generations of dolomite that can be distinguished by their cathodoluminescence, chemical compositions, and times of formation. The petrography and geochemistry of glauconite, the predominant clay mine…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDye sensitization of van der Waals surfaces of tin disulfide photoanodesBruce A. ParkinsonCite this: Langmuir 1988, 4, 4, 967–976Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published inissue 1 July 1988https://pubs.acs.org/doi/10.1021/l…
Abstract Primary nucleation of poly(vinylidene fluoride) (PVF 2 ) γ‐phase crystals from the melt is affected by the presence of an electric field. Crystallization under the electric field is studied by polarized optical microscopy, thermal analysis, and wide‐angle x‐ray diffraction. Preliminary results indicate that t…
The resonance Raman spectrum obtained from manganese containing argon matrices previously assigned to the dimer [M.Moskovits, D.P.DiLella, and W.Limm, J. Chem. Phys. 80, 626 (1984)] is shown to belong to a zero order D3h trimer subject to Jahn–Teller distortions. The actual resonance Raman spectra of the dimer in both…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel synthesis of aromatic polyamides by palladium-catalyzed polycondensation of aromatic dibromides, aromatic diamines, and carbon monoxideMasaru Yoneyama, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1988, 21, 7, 1908–1911Publication Date (Print):July 1, 198…
Abstract The relationships, between chemical structures of various aromatic polyimides and their thermal expansion coefficients, were investigated and the properties of low thermal expansion polyimides were elucidated. Such low values were observed for polyimides obtained from pyromellitic dianhydride or 3,3′,4,4′‐bip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPathways for carboxylic acid decomposition on titaniaK. S. Kim and M. A. BarteauCite this: Langmuir 1988, 4, 4, 945–953Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published inissue 1 July 1988https://pubs.acs.org/doi/10.1021/la00082a028…
Al-doped ZnO films were prepared by both RF planar magnetron and RF diode sputterings. The dependence of the ZnO film resistivity on both substrate position and Ar gas pressure was investigated. Energetic oxygen atoms (O atoms) bombarding the film were also observed by time-of-flight apparatus, and the correlation bet…
A density of states diagram for the mobility gap of a-Se is constructed by self-consistent analyses of time-resolved xerographic residual and dark depletion potentials in both undoped and halogen- and alkali-doped Se films. These are then combined with analyses of transient transport data to reveal additional features…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of organosilicon compounds. 240. Pentacoordinate allylsilicates: characterization and highly stereoselective reaction with aldehydesMitsuo. Kira, Kazuhiko. Sato, and Hideki. SakuraiCite this: J. Am. Chem. Soc. 1988, 110, 14, 4599–4602Publication Date (Print):July 1…
A sintering model has been developed to predict the consequences of independently varying the grain growth rate in alumina during final‐stage sintering of a microstructure containing both small (first‐generation) and large (inter‐agglomerate second‐generation) pores. The model shows that although it may be thermodynam…
Inhomogeneous field breakdown in SF/sub 6/ has been investigated, and a theory has been developed which predicts the breakdown voltage for fast-rising (rectangular) waveforms applied to arbitrary electrode geometries and gas pressures. This theory facilitates the analytical design aspects of many GIS components where…
We used cross‐sectional transmission electron microscopy techniques to investigate the microstructure of metal/polyimide interfaces. By comparing our results with previously obtained spectroscopy data, we show that the microstructure of these interfaces is strongly related to the tendency of the metal to chemically re…
Abstract— Zn(II)phthalocyanine (ZnPc) generates O2(1Δg) with a quantum yield of ca. 0.4 upon photocxcitation at 354 or 600 nm in ethanolic solution as determined by time‐resolved phosphorescence studies at 1270 nm and photooxidation experiments using 1,3‐diphenylisobenzofuran (DPBF) as substrate. The quantum yield of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical and photochemical processes on clay surfacesJ. K. ThomasCite this: Acc. Chem. Res. 1988, 21, 7, 275–280Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published inissue 1 July 1988https://pubs.acs.org/doi/10.1021/ar00151a004ht…
Cubic and tetragonal ${\mathrm{BaTiO}}_{3}$ and orthorhombic ${\mathrm{KNbO}}_{3}$ have been studied by Raman scattering, using an iodine filter to eliminate elastically scattered light. In addition to the usual phonon features, such as the soft E mode in tetragonal ${\mathrm{BaTiO}}_{3}$ and the soft ${B}_{2}$ mode i…
A theory for the termination rate coefficient in high-conversion free-radical polymerization systems, based on the concept of chain-end diffusion by propagational growth ("reaction diffusion" or "residual termination" mechanism), is proposed. This is used to formulate the appropriate diffusion coefficient of a macrora…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhancement of hydrogen bonding in vicinal water; heat capacity of water and deuterium oxide in silica poresFrank M. EtzlerCite this: Langmuir 1988, 4, 4, 878–883Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published inissue 1 July 1988h…