Materials Literature
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When excited by the 6471-\AA{} line from a krypton laser, blue and uv fluorescence has been observed in La${\mathrm{F}}_{3}$: ${\mathrm{Tm}}^{3+}$ at room temperature. The main emission features have been identified as originating from the $^{1}D_{2}$ and $^{1}G_{4}$ levels, reached by a stepwise excitation process. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature EPR studies of highly anisotropic low-spin (protoporphyrinato)iron(III) complexesCatharina T. Migita and Masamoto IwaizumiCite this: J. Am. Chem. Soc. 1981, 103, 15, 4378–4381Publication Date (Print):July 1, 1981Publication History Published online1 May 2002P…
The standard thermodynamic properties of phases in the lime-alumina-silica- water system between 273.15 and 1800 K at 101.325 kPa (1 atm) were evalated from published experimental data. Phases included in the compilation are boehmite, diaspore, gibbsite, kaolinite, dickite, halloysite, andalusite, kyanite, sillimanite…
Wild-type ebg enzyme, the second beta-galactosidase of Escherichia coli K12, does not permit growth on lactose. As part of a study of the evolution of new enzymatic functions, I have selected, from a lacZ deletion strain, a variety of spontaneous mutants that grow on lactose and other beta-galactoside sugars. Single p…
Abstract The effects of long‐term lime and K applications on quantity‐intensity (Q/I) relationships were investigated on the Ap and B21t horizons of a Kalmia soil (a fine‐loamy over sandy or sandy‐skeletal, siliceous thermic (Typic Hapludults) from the Delaware Coastal Plain. The predominant mineral suite of the <2…
The efficiency of the chemical cross-linking of polypropylene was found to be dependent on the peroxide used (dicumyl peroxide, benzoyl peroxide, t-butyl peroxide, and t-butyl peroxy-benzoate). The reason for different cross-linking efficiency of peroxide and enhancement of the cross-linking efficiency of peroxide in…
Abstract The diffusion of benzyl alcohol and plasticizer in compression‐molded sheets of plasticized poly(vinyl chloride) was studied over the temperature range 30–55°C. A simultaneous diffusion occurred for benzyl alcohol into polymer and for dioctyl phthalate as plasticizer from polymer into liquid when the polymer…
The influence of substrate temperature (20 °– 450 °C) and sputter gas pressure (0.5–100 Pa) on the evolution of coating morphology during growth of magnetron deposited copper films has been investigated for film thicknesses up to 10 μm. Classification of films according to structure and surface topography yields a str…
Abstract Weld or knit lines result wherever two or more polymer flow fronts unite. This results in a region of a different level of molecular entanglements than the bulk material. Consequently, weld regions have been observed to have inferior mechanical properties compared to the bulk. Although this phenomenon occurs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeformations from octahedral geometry in d4 transition-metal complexesPavel Kubacek and Roald HoffmannCite this: J. Am. Chem. Soc. 1981, 103, 15, 4320–4332Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981https://…
The small-angle X-ray scattering (SAXS) technique is used to study the transition in styrene-butadiene block copolymers from a microdomain structure to a disordered homogeneous phase. The transition, occurring on raising the temperature, is reproducible and thermally reversible. The SAXS intensity pattern, exhibiting…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly conducting linear stacked polymers: iodine-doped fluoroaluminum and fluorogallium phthalocyaninesRonald S. Nohr, Paul M. Kuznesof, Kenneth J. Wynne, Malcolm E. Kenney, and P. G. SiebenmanCite this: J. Am. Chem. Soc. 1981, 103, 15, 4371–4377Publication Date (Print):Jul…
Abstract Hot‐stage polarized light microscopy suggests that bulk hydroxypropylcellulose (Hercules Klucel E) is a cholesteric liquid crystal. Rheological measurements indicate this system exhibits shear viscosities similar to those of polyolefin melts except that it has a yield value comparable to suspensions. Birefrin…
Silicon dioxide films have been deposited by reacting silane and nitrous oxide in a parallel‐plate, radial flow, plasma reactor. Deposition parameters (temperature, power, and gas composition) have been systematically varied, and the films characterized by measuring the infrared spectra, deposition rate, density, etch…
Abstract The synthetic route to polyetherimides by displacement of nitro‐groups from disubstituted bis‐imides by the dianion of bisphenols are described. The prepration of bis‐imides and bisphenol dianions, their polymerization, and some of the properties of the polymers are presented in detail. The 13 C‐NMR spectra o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 CP/MAS NMR studies of methylchlorosilane reactions on silica gelDean W. Sindorf and Gary E. MacielCite this: J. Am. Chem. Soc. 1981, 103, 14, 4263–4265Publication Date (Print):July 1, 1981Publication History Published online1 May 2002Published inissue 1 July 1981h…
The crystal structure of avian pancreatic polypeptide (aPP), a 36-residue polypeptide with some hormonal properties, has been determined by using single isomorphous replacement and anomalous scattering to 2.1-A resolution. The phases were extended to 1.4-A resolution by using a modified tangent formula. The molecule c…
Abstract: SUMMARY: Many phyllosilicate minerals gain greatest mechanical stability on sedimentation by orienting themselves parallel to bedding. Loss of water during the initial stages of compaction also promotes or enhances such a preferred alignment. If the mineral is then buried in the absence of tectonic stress, s…
A new approach is presented for understanding the frequency and flux density dependence of eddy current losses in polycrystalline and amorphous soft magnetic materials by introducing an experimentally derived parameter which is thought to be proportional to the number of active domain walls. The relationship among edd…
Abstract The orientation of nematic liquid crystals (LC) by monolayers of suitable amphiphilic compounds on solid substrates has been studied by systematic experiments using polarizing microscopy, magnetic Freedericksz‐transition, and contact angle measurements. Orientation is influenced mainly by the following parame…