Materials Literature
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The short-range structure of zirconium hydroxide, an amorphous precursor in the synthesis of zirconia-based ceramics, is considered. New EXAFS data are combined with existing chemical information on this hydroxide to produce a structural model based on two-dimensional linking of tetrameric units involving a combinatio…
The dissolution of nitrogen into molten iron in the temperature range from 1823 to 1923 K has been investigated using an isotope exchange reaction. The feature of this technique is that the chemical reaction rate can be determined without the effect of mass transport in liquid iron. It was experimentally shown that th…
Three polymeric iron(III) complexes [Fe(tdim)Ln]CIO4(L = L11, L2 or L33) consisting of a bridging ligand (tdim = 1,1′-tetramethylenediimidazole) and a quadridentate Schiff base ligand have been prepared and characterized, where H2Ln= RN(CH2)2NR′[R = R′= MeC(OH)CHCMe, n= 1; R = R′=o-HOC6H4CH=,n=3;R = MeC(OH)CHCMe, R′=o…
The structure of mesophases derived from a triptycene subunit substituted with five paraffinic chains has been determined by X-ray diffraction at small angles. They all show a smectic ordering. This is the first example of a smectogen whose rigid core belongs to the D3h symmetry. A hexagonal order has been observed in…
The magnetic field reorientation of an initially aligned sample of a nematic polymer liquid crystal was followed by proton NMR. Evolution to a metastable (banded) state was considered using a Rheo-NMR technique developed previously. Late stage reorientation was studied by taking into account the dynamics of defects fo…
Abstract Strontium tartrate tetrahydrate single crystals doped with nickel have been grown in silica gel. The grown crystals have been characterized by X‐ray, atomic absorption spectroscopy (AAS), thermogravimetric analysis (TGA), and etching technique.
In order to use hydrogen as an energy carrier in modern energy-use systems, it is necessary to find compact, efficient means for storing hydrogen for mobile and (or) stationary applications. Performance evaluations coupled with cost analyses for four major alternatives for hydrogen storage show that storage on activat…
The basic principles of X-ray microanalysis of thin surface films and stratified targets are summarized. The influence of the electron beam accelerating voltage on the analyzed depth is discussed. It is shown that in the field of soft X-rays, the effective depth of analysis is most often limited by the absorption of t…
A major complication of long-term urethral catheterization is catheter blockage by encrustation. We have examined 20 encrusted catheters and in each case crystal formation was associated with the presence of bacterial biofilms on the luminal surfaces. Scanning electron microscopy and X-ray microanalysis indicated the…
ハイドロタルサイトの熱分解によって生成する酸化マグネシウムーアルミニウム固溶体[Mg0.5δAl0.2δ・口0.14O](口はvacancy)の再水和反応を利用し,有害重金属オキソ酸イオンであるCrO22-とMnO4-の除去について定量的に調べた。酸化物固溶体はこれら陰イオンと水分子を取り込みながら層間距離8.7Aのハイドロタルサイト様化合物を形成し,吸着データはFreundlichの吸着等温式によく適合した。この際,二価陰イオンのCrO42-は電荷密度が大きいため,広い濃度領域において一価陰イオンのMnO4-よりも選択的に取り込まれることが確かめられた。また,金属オキソ酸イオンの吸着量の増加にともなって層間距離が不均一になるため…
The thermal decomposition of m-ditoluidinium sulfate (m-DTS) has been studied and 2-methylsulfanilic acid (2-MSA) has been found to be the decomposition product. Isothermal TGA data on m-DTS were fitted in Avrami-Erofeev (n= 2, 3), Contracting area. Contracting cube and Ginstling Brounshtein equations. The Contracting…
The X-ray crystal structure of [lnIII(octaethyloxophlorin)]2 shows that the centrosymmetric dimeric structure places the planes of the two macrocycles 3.25 Å apart but causes only minimal distortion to the porphyrin-like cores of the molecule.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of crosslinks on the miscibility of a deuterated polybutadiene and protonated polybutadiene blendHiroshi Jinnai, Hirokazu Hasegawa, Takeji Hashimoto, Robert M. Briber, and Charles C. HanCite this: Macromolecules 1993, 26, 1, 182–188Publication Date (Print):January 1,…
Removal of a failing bioprosthesis can be a delicate operation and extensive damage can be caused. Eighteen patients with failing bioprostheses underwent excision of the leaflets, then the "new" mechanical valve was sewn onto the "old" bioprosthetic ring. At follow-up, clinical and 2D color-flow echo-Doppler evaluatio…
Abstract Crosslinked poly(hydroxyethylmethacrylate) [poly(HEMA)] beads were prepared by the suspension copolymerization of 2‐hydroxyethylmethacrylate monomer with ethyleneglycol dimethacrylate (EGDMA) in aqueous media which contained only magnesium oxide (MgO) as a suspension stabilizer and also salting‐out agent. The…
"ORGANIC COATINGS: SCIENCE AND TECHNOLOGY VOLUME 1: FILM FORMATION, COMPONENTS AND APPEARANCE." Drying Technology, 11(6), p. 1477
An attempt was made to prepare carbon-metal composites by the heat treatment of graphite oxide (GO) which was ion-exchanged with metal cations. The composites thus obtained were characterized to elucidate the dispersion state and the chemical form of metal species in carbon matrix. It was found that metal species are…
High strength prestressing steels in prestressed concrete structures are protected against corrosion due to passivation resulting from the high alkalinity of the concrete. If depassivation of the prestressing steel occurs due to the ingress of chlorides the corrosion risk can be minimized by application of cathodic pr…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text C. Li, Y. Guyot, C. Linarès, R. Moncorgé, and M. F. Joubert, "Radiative Transition Probabilities of Trivalent Rare-Earth Ions in LiYF4," in Advanced So…
The local structure around Eu3+ ions in sodium aluminosilicate glasses was investigated on the basis of phonon sideband associated with the 5D0←7F0 transition of Eu3+. It was found that the positive charge of Eu3+ was compensated by nonbridging oxygens (NBOs) in Q3 units rather than by the excess negative charge of Al…