Materials Literature
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The infrared spectrum (700–4000 cm–1) of quasi-stoichiometric microcrystalline ZnO has been recorded at various temperatures (97–523 K) and following various redox treatments.A broad band centred at ca. 1500 cm–1, produced on samples cooled down to 97 K in oxygen, is ascribed to the increasing concentration of un-ioni…
A short review is given of successively the diamagnetic susceptibility, the refractive index, the dielectric permittivity, the elastic constants and the viscosity coefficients of nematic liquid crystals. Emphasis is on typical results that have been obtained, and the possibilities and problems connected with a molecul…
Silver nitrate 3 mug/ml prevented the separation into two daughter cells of sensitive dividing cells of Pseudomonas aeruginosa growing in nutrient broth plus the chemical. Cell size of sensitive cells was increased and the cytoplasmic contents, cytoplasmic membrane and external cell envelope structures were all abnorm…
Three paramagnetic Fe defect complexes have been observed by electron-spin resonance in chemically reduced crystals of SrTi${\mathrm{O}}_{3}$. These are identified as (1) an ${\mathrm{Fe}}^{3+}$ ion substituted on a Ti site with a nearby charge-compensating interstitial impurity, and (2) and (3) two charge states of s…
Abstract Progress in designing and constructing an atmospheric or environmental scanning electron microscope (SEM) is reported. The introduction of vacuum pumping between the objective and pressure limiting aperture has allowed the use of relatively large pressure limiting apertures, i.e., up to 57 μm for operation at…
Abstract River inputs of dissolved silica into a shallow eutrophic lake (Lough Neagh, N Ireland) are quantified. Exports of silica are high (3.6 to 9.6 tonnes dissolved SiO 2 km −2 y −1 ), but the spring concentration of dissolved silica in the lake depends on release of silica from the sediments. Two planktonic diato…
Fluorescence quantum yields and excited singlet-state lifetimes were measured for a series of substituted tetraphenylporphyrins in benzene solution. The rate constants for non-radiative deactivation of the excited singlet state correlated with the Hammett constant of the substituent for both electron withdrawing and e…
A separation-method for dispersed carbonaceous material in rocks and a calculation-method for Lc(002) are presented, and a numerical expression of the graphitizing-degree is newly proposed revising Tagiri and Tsuboi (1979), Graphitizing-degree=[(d002-3.70)/log (Lc(002)/1000)]×100. Some examples in the metamorphic aure…
Some electrooptic and thermooptic effects of cholesteric phase are used in liquid crystal visualisation and display systems provided spiral pitch is equal to a visible wavelength or several micrometers. Liquid crystals with cholesteric properties were generally cholesteric esters. Unfortunately these materials are che…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the mechanism and kinetics of plasma-initiated polymerization of methyl methacrylateD. R. Johnson, Y. Osada, A. T. Bell, and M. ShenCite this: Macromolecules 1981, 14, 1, 118–124Publication Date (Print):January 1, 1981Publication History Published online1 May 2002…
Carbon dioxide sorption isotherms in poly(methyl methacrylate) (PMMA) and poly(ethyl methacrylate) (PEMA) are reported for pressures up to 20 atm. Temperatures between 35 and 80°C were studied for PMMA and temperatures between 30 and 55°C were studied for PEMA. Typical dual mode sorption isotherms concave to the press…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins. 41. Phosphorus mesoporphyrin and phthalocyanineMartin Gouterman, Phillip Sayer, Eric Shankland, and Justin P. SmithCite this: Inorg. Chem. 1981, 20, 1, 87–92Publication Date (Print):January 1, 1981Publication History Published online1 May 2002Published inissue 1…
Two electrochemical techniques, anodic polarization and potentiostatic etching, were used in detecting the degree of sensitization (DOS) of austenitic stainless steel in an electrolyte which contained perchloric acid with NaCl as an additive. The DOS of the specimen could be quantitatively measured by the current dens…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[Rh10P(CO)22]3-. A transition-metal carbonyl cluster with a metal polyhedron based on the bicapped square antiprism as illustrated by the structural study of the benzyltriethylammonium saltJose L. Vidal, W. E. Walker, and R. C. SchoeningCite this: Inorg. Chem. 1981, 20, 1, 2…
A unique resonance in the 13C NMR spectrum of [13C]methylated ribonuclease A has been assigned to a N epsilon, N-dimethylated active site residue, lysine 41. The chemical shift of this resonance was studied over the pH range 3 to 11, and the titration curve showed two inflection points, at pH 5.7 and 9.0. The higher p…
Using a cell designed to study the electronic interactions of gases with illuminated powders, the photoconductance, σ, of a series of oxides (TiO2, ZrO2, V2O5, ZnO, SnO2, Sb2O4, CeO2 and WO3) has been measured at equilibrium under various oxygen pressures PO2(from 7 × 102 down to 0.7 Pa) at room temperature in an atte…
The effects of doping with multiple impurities on the electromechanical properties of lead zirconate-titanate ceramics have been investigated from the viewpoint of the internal bias field. The internal bias field is strengthened by doping with the multiple acceptors K and Fe, but weakened by the multiple donors La and…
Abstract The evaporation of metallic gold into an ethanolic solution of bis(diphenylphosphino)‐methane (dppmH) and NH 4 NO 3 results in the formation of [Au 5 (dppmH) 3 (dppm)](NO 3 ) 2 with (dppm) = [Ph 2 PCHPPh 2 ] − ; an X‐Ray structure analysis revealed the presence of a Au‐C bond. Full physical data, including 19…
The lack of suitable materials having permeabilities (μr) greater than unity at microwave frequencies has previously made it difficult to design thin coatings of broadband radar absorbersat this frequency range. A possible solution is to utilize the hexagonal ferrites that exhibit significant μrvalues (̃5) over narrow…
Conference International Symposium on Polyvinylchloride, Third, Cleveland, Ohio, USA, 1980-08-10–1980-08-15 Published Online: 2009-01-01 Published in Print: 1981-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston