Materials Literature
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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…
To obtain fine grained Cu based shape memory alloys after thermomechanical processing, Ti is added to β-Cu–Zn–Al or β-Cu–Al–Ni as a particle forming element. This work consists of a study of the mechanism that controls the grain growth limiting effect during the final annealing treatment. A critical evaluation of the…
A model is proposed to study the dynamics of phase boundaries using a conserved order parameter. A relation between the temperature and the curvature, surface tension, and velocity is derived and compared with the analogous system of equations using a nonconserved order parameter. The kinetic-undercooling term is alte…
Light microscopy and scanning and transmission electron microscopy of the ventral adhesive disc of the northern clingfish, Gobiesox maeandricus, demonstrate that two distinct types of epidermis are present on the disc surface. Most of the disc is covered with cuboidal epithelium in which four cell types can be disting…
Uranium oxides are important nuclear reactor fuels and there are at least nine oxides known, many of which are mixed valence and polymorphic. Transmission-IR spectroscopy has proven to be a useful method for characterizing the oxides. For instance, IR spectra and vibrational assignments have been reported for UO2, UO2…
A new nonlinear optical organic-inorganic crystal, thiosemicarbazide cadmium bromide hydrate (TSCCB), with crystal class m has been grown by a temperature-lowering technique (TLT) and a temperature-difference technique (TDT). The crystal structure of TSCCB is reported. Its linear and nonlinear optical properties have…
Abstract The effect of the spherical shape of powder on the determination of oxide thickness in ESCA analysis in investigated. A theoretical model, which takes account of the angular dependence of the X‐ray flux, the photoelectron intensity and the etch rate, is outlined. The model agrees well with experimental depth…