Materials Literature
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The prevailing zirconia modification in a series of metal/ZrO2 catalysts has been investigated by Raman spectroscopy. Activation of an amorphous Cu70Zr30 alloy, or coprecipitation of zirconium dioxide with either copper, nickel or silver oxides at constant pH results in amorphous solids containing varying fractions of…
A method for producing electrets is proposed in which an electric discharge is produced by a negative impulse voltage in a small air gap. The dielectric film to be charged is placed between two planar electrodes, the film being in contact with one of the electrodes and separated from the other by the air gap. The elec…
Cold rolling and recrystallization textures of the metastable β phase (bcc) and transformation textures of the α phase (hcp) precipitated during aging from the β matrices having these textures in a Ti–15V–3Cr–3Sn–3Al alloy were investigated in conjunction with their microstructures. Furthermore, the measured transform…
The variation of the defect number that results from the interaction of ZnO with air–reducing gas mixtures (H2–air and CO–air) has been investigated by EPR spectroscopy. It appears that up to 573 K the surface interaction with CO or H2 and air is dominated by the reaction of CO or H2 with the chemisorbed oxygen specie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon-13 CP-MAS, carbon-13 and proton NMR spectroscopic study of mixed-valence 1,1''-biruthenocenium saltsMasanobu Watanabe, Toschitake Iwamoto, Satoshi Kawata, Atsushi Kubo, Hirotoshi Sano, and Izumi MotoyamaCite this: Inorg. Chem. 1992, 31, 2, 177–182Publication Date (Pri…
Following the chemical characterization of calotroposides A (1) and B (2), five related oxypregnane-oligoglycosides named calotroposides C (3), D (4), E (5), F (6), and G (7) have benn additionally isolated from the root of Calotropis gigantea (Asclepiadaceae), an Indonesian medicinal plant. The chemical structures of…
Electrostatic heterodimers are formed in the liquid phase by pairing a zinc porphyrin with either a copper or an aluminium phthalocyanine bearing oppositely charged substitutents. The ground-state absorption spectra of such heterodimers are drastically changed with respect to the corresponding monomers, indicating the…
The part played by molybdenum in the prevention of pitting corrosion of iron and steels in the presence of chloride ions can be explained using Raman spectroscopy. Here, molybdenum introduced as a molybdate in the electrolyte solution was particularly studied. Different polarization methods were used (potentiostatic p…
The structural model of tetragonal SeO 2 proposed by McCullough [JACS 59 (1937) 789] has been refined at 139 and 286 K. Space group P 4 2 / mbc , Z = 8, M w = 110.96, a = 8.3218(9), c = 5.0541(6) Å, V = 350.0(1) Å 3 at 139 K and a = 8.3622(7), c = 5.0612(5) Å, V = 353.9(1) Å 3 at 286 K. 349 and 635 unique reflections…
Abstract Cyclization of α,ω;‐dilithiopolyisoprenes has been achieved in hexane solution in the presence of tetrahydrofuran (15% in volume) at −40 to ‐ 50°C. Using as linking agent the non‐conjugated diene 1,2‐bis(isopropenyl‐4‐phenyl)‐ethane, macrocyclic polyisoprenes could be obtained with yields of at least 90%, eve…
This article concerns the problem of determining shapes of minimum stress concentration. Special emphasis is placed upon the mathematically precise formulation of these problems and upon the study of cases in which the optimum shape can be found in a highly explicit form. For all the cases discussed, a mathematical pr…
An electrical conductivity method was tested. The system of ammonium aluminum sulfate-water was used as a model system
The energy of the first plasmon loss peak has been determined for the ~-Zr hydride phase in pure Zr. The peak energy is sufficiently different from that of the 03B4-hydride to permit EELS "fingerprinting" with ease using a parallel EELS system, but with greater difficulty using serial EELS, because of drift associated…
ヨウ素化合物は炭素-ヨウ素結合の解離エネルギーが低いためラジカル的に活性で, ラジカル重合反応の過程では連鎖移動反応が関与する結果, ラジカル的連鎖再賦活化機構によるラジカルリビング重合の可能となることを見いだした. これを『ヨウ素移動重合』と称したが, 基本的に次のように総括することができる. 1) 重合系のポリマー分子数は系内に添加するヨウ素化合物分子数で決まる. 2) 分子量分布が狭いものを含め, 自由に調整できる. 3) ブロックポリマーの合成を含む遂次連鎖成長が可能である. 4) 分子末端を占めるヨウ素は反応性に富み, 種々のポリマーのテレキリックな架橋や末端反応性高分子の合成に利用できる. 5) 非対称モノマーでは付加…
Ceria, zirconia and zinc oxide have been successfully prepared by the thermal decomposition of the respective soluble cerium, zirconium and zinc salts in decan-1-ol, undecan-1-ol and ethane-1,2-diol. Only those metal salts whose (solid phase) decomposition temperature was less than or equal to the reflux temperature o…
The structures of the intercalates MgxTiS2–c(0 < x < 0.25), prepared by chemical means, have been refined using high-resolution X-ray powder diffraction. The solid-solution adopts a structure derived from that of a spinel, with space group Fd3m. Magnesium exclusively occupies the octahedral 16c sites within the cubic…
The paper describes a laboratory method used for determining the partial solubility parameters of five METHOCEL* and six ETHOCEL* cellulose ether products. A simple computer spreadsheet has also been devised to calculate the partial solubility parameters from the laboratory data. These new laboratory derived values ex…
An instrumented mannequin has been constructed for testing the thermal protective qualities of garments when subjected to short duration flash fires. To measure the rate of heat transfer to the mannequin surface 110 skin simulant sensors are used. The flash fires are produced with propane diffusion flames. A computer…
Diamond has been synthesized from cyclic hydrocarbons under high pressures between 6 to 9GPa and high temperatures ranging from 710 to 1290°C. The result offers a clue to the genesis of diamond in the deep interior of the earth.
We describe the synthesis and crystallisation by means of chemical vapour transport reactions of TiPO 4 and VPO 4 . TiPO 4 ( a = 5.2985(5) Å, b = 7.911(1) Å, c = 6.3473(5) Å) and VPO 4 ( a = 5.2316(5) Å, b = 7.7738(7) Å, c = 6.2847(5) Å) adopt the crystal structure of chromiumvanadate CrVO 4 ( Cmcm , Z = 4). The resul…