Materials Literature
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Identification of corrosion products on non-ferrous metal artifacts recovered from historic shipwrecks off the coast of Western Australia has provided conservators with useful information regarding the nature of the degradation processes on copper, brass, bronze, silver, lead and pewter artifacts. Analysis of the diff…
Surface-Enhanced Raman Spectroscopy (SERS) has been used to characterize nucleic acid compounds—such as free bases, mononucleotides, and dinucleotides—to study the viability of the technique to analyze mixtures of the various compounds and to see whether the SERS properties of the dinucleotides are sequence dependent.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh coverages and subsurface penetration of oxygen on ruthenium(001)Igor J. Malik and Jan HrbekCite this: J. Phys. Chem. 1991, 95, 24, 10188–10190Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe concept of geometrical rigidity around a transition-metal center, a significant factor in improving thermal stability for .sigma.-alkyl transition-metal complexesLian Zhang and Krister ZetterbergCite this: Organometallics 1991, 10, 11, 3806–3813Publication Date (Print):N…
Around a sodium atom template the spherically shaped shell of the dodecameric organotin–oxygen cation of the title compound assembles. (See polyhedral representation, right; the black dots symbolize isopropyl groups.) The [Ag7I11] anion of this novel inorganic host–guest complex is also quite remarkable. It is a one-d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and spectroscopic studies of manganese complexes of pendant-arm macrocycles based on 1,4,7-triazacyclononane: crystal structures of the manganese(II) complex [MnLH3][MnCl4] and of the mixed-valence manganese(II)-manganese(IV) hydrogen-bridged dimer […
Abstract Difunctional hydroxy‐terminated poly(ε‐caprolactone‐co‐ε‐valerolactone) (PCV) oligomers were synthesized by the diol‐initiated bulk copolymerization of ε‐caprolactone (C) and δ‐valerolactone (V). The two homopolymers were semicrystalline, with almost identical melting temperatures; copolymerization significan…
Abstract We have studied the migration of the hindered phenol, octadecyl‐3,5‐bis (1,1‐dimethylethyl)‐4‐hydroxybenzenepropanoate, and the phosphite co‐stabilizer tris 2,4‐bis(1,1‐dimethylethyl)phenylphosphite, out of films of polypropylene (nominal melt flow 3.5 g/10 min). Loss of additive from an initial 10% weight‐%…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet oxygen mediated oxidative decarboxylation of pyrrole-2-carboxylic acidsDale L. Boger and Carmen M. BaldinoCite this: J. Org. Chem. 1991, 56, 24, 6942–6944Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 Novemb…
Abstract The stabilities Be n and B n clusters (4 ≤ n ≤ 8) based on the vibrational analysis were investigated by ab initio MO calculations. The computations were performed by using a 3‐21G basis set at the R(U)HF level and at the R(U)MP4 level with the HF optimized structures. Spin‐multiplicities were also considered…
Abstract Computer-assisted image analysis of back-scattered electron (BSE) micrographs of petrographic sections is useful for the quantification of clay mineral microporosity in sandstones. Authigenic clay minerals from North Sea clastic reservoirs generally have higher microporosities than detrital clay minerals. Dia…
Abstract Five basalt samples from the Point Sal ophiolite, California, were examined using HRTEM and AEM in order to compare observations with interpretations of XRD patterns and microprobe analyses. XRD data from ethylene‐glycol‐saturated samples indicate the following percentages of chlorite in mixed‐layer chlorite–…
The luminescence properties of ${\mathrm{Eu}}^{3+}$ ions in yttria-stabilized zirconia crystals are studied on samples with various yttria concentrations by using site-selective spectroscopy. From the analysis of luminescence spectra excited by ultraviolet light, it is found that the average crystal-field strength whi…
Rhombohedral distortion caused by the shape of the organic ions is found in the antiperovskite structures of all four ternary salts 1,which were obtained by electrocrystallization of the components tetrathiafulvalene (TTF),tetrabutylammonium halohexamolybdate, and tetrabutylammonium halide. The three-fold symmetry is…
The role of oxygen in affecting the adhesive bonding at the metal/polyimide (polyimide-on-metal) interface has been studied. Both pyromellitic dianhydride (PMDA) -oxydianiline (ODA) and biphenyl-tetracarboxylic dianhydride(BPDA) -p-phenylene diamine (PDA) based poly(amic acid) precursors were cast and fully imidized o…
For pt.VIII see ibid., vol.7, no.5, p.9 et seq. (1991). The physical aspects of partial discharge (PD) in SF/sub 6/ gas-insulated substations (GIS) are reviewed. The orientation is toward present and developing techniques for evaluating defects in solid and gaseous insulation systems on the basis of PD measurement. St…
Abstract Correlations are established between the structural data provided by x‐ray diffraction and Raman spectroscopy on borate crystals. A linear relationship is found to be adequate to describe the bond length‐stretching frequency correlations in nine meta‐, pyro‐ and ortho‐borate crystals consisting solely of tria…
In this paper, we present numerical calculations of the band spectrum of periodic approximants of the octagonal quasiperiodic tiling. We have studied a one-parameter family of Hamiltonians, including the pure hopping case, the Laplacian, and a regime in which atomic potentials prevail. We have found a parameter range…
Polarization experiments to assess the suitability of oxalic and nitric salts as potential inhibitors for the corrosion of aluminum alloy 7075 by sodium chloride revealed that a mixture of the two salts best reduces the observed rates of corrosion. The oxalate ions cause a separation between the pitting and corrosion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure characterization of polyurethanes containing poly(dimethylsiloxane)Mitsuhiro Shibayama, Masakatsu Suetsugu, Shinichi Sakurai, Tomoyuki Yamamoto, and Shunji NomuraCite this: Macromolecules 1991, 24, 23, 6254–6262Publication Date (Print):November 1, 1991Publication H…