Materials Literature
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The dehydration-rehydration of Mg-vermiculite, as large flakes (7 × 5 × 0.1 mm3) and powder (⩽ 80 µm), has been studied. Samples were treated in a sealed bomb at 140 and 100 °C for several days. After dehydration, they were rehydrated at room temperature. The samples were examined by X-ray diffraction, and the results…
Lanthanide(III) and yttrium(III) complexes of the 20-membered hexaaza Schiff-base macrocycle 6,20-dimethyl-2,10,16,24,29,31-hexaazapentacyclo[23.3.1.14,8.111,15.118,22]dotriaconta-1(29),2,4,6,8(30),9,11,13,15(31),16,18,20,22(32),23,25,27-hexadecaene-30,32-diol (H2L3) have been synthesised by metal-template condensatio…
Abstract Reduction of CO2 with H2O was carried out by microwave plasma for the formation of methanol. The results of steam chromatography and mass spectrometry showed that the plasma products contained methanol. The methanol formation was also found in H2O-plasma-cleaning process, in which materials which had been dep…
Mg–10 mass%Gd–3 mass%Nd–Zr alloy and Mg–10 mass%Dy–3 mass%Nd–Zr alloy have high strength at elevated temperatures and their application to automotive engine parts is expected. In this paper, the corrosion propeties of these alloys in salt solution are discussed. The corrosion properties are evaluated by immersion test…
Reaction of [Ru(ttp)(NO)Cl] with aryl or alkyl Grignard reagents gives [Ru(ttp)(NO)R](R = C6H4F-p, Me); the Ru–C bond in [Ru(ttp)(NO)Me] undergoes insertion by SO2, and the structure of [Ru(ttp)(NO)(C6H4F-p)] is determined by X-ray crystallography.
Abstract � Electromigration induced degradation in integrated circuits has been accelerated bycontinuous scaling of device dimensions. We present a method� ology for synthesizing high�reliability and low�energy microarchitectures at the RT level by judiciously bind� ing and scheduling the data transfers of a control d…
Clays modified with paramagnetic ions have been shown to be effective magnetic resonance imaging contrast agents. The efficacy in part relies on the suspension of the small clay particles in aqueous solution. In this study a series of macromolecules were evaluated as suspending agents for Gd(III) ion exchanged hectori…
The 57Fe Mössbauer spectrum of semiconducting xK2O·(90–x)V2O5· 10Fe2O3 glasses (20⩽x⩽30) consists of a quadrupole doublet peak. The linewidth and the quadrupole splitting decreased gradually after heat treatment at the crystallization temperature, reflecting an increased uniformity of Fe–O bonds and a decreased distor…
Reaction of metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with ‘active-methylene’ compounds (e.g. malonates, malononitriles) in the presence of base gives access to novel cyclopropachlorins or functionalized trans-chlorins (both characterized by X-ray crystallography) by way of a sequential Michael addition and rar…
The solubilities of sulfolane (tetrahydrothiophene 1,1-dioxide, tetramethylene sulfone (TMS)) have been determined experimentally in six solvents, 1-heptyne, tetrahydrofuran, 1,4-dioxane, 1,1,1-trichloroethane, benzene and cyclohexane, by a dynamic method in the temperature range (250 to 301) K. The results have been…
The chemical behaviour of oxotitanium(IV) phthalocyanine (OTiPc) in mixtures of dichloromethane and trihalogenoacetic acids was studied by means of spectroscopic measurements. In dichloromethane–trifluoroacetic acid mixtures, OTiPc was relatively unstable, undergoing gradual decomposition via the radical cation of OTi…
The new compounds Rb 3 Yb 7 Se 12 and CsEr 3 Se 5 have been synthesized through the reaction of elemental rare-earth metal and Se with halide flux at 680 °C. The structures of the compounds were determined by the single-crystal X-ray diffraction method. The structures of CsEr 3 Se 5 and Rb 3 Yb 7 Se 12 are considerabl…
The hydrothermal synthesis, X-ray single crystal structure, magnetic properties, and solid state NMR and infrared spectroscopic data of a new compound, K(VO)(SeO(3))(2)H, are described. K(VO)(SeO(3))(2)H crystallizes in the monoclinic space group P2(1)/m (No. 11), with a = 7.8659(7) Å, b = 10.4298(7) Å, c = 4.0872(7)…
The complicated rhombohedral unit cell of crystalline 03B2-boron containing 105 atoms is a good approximant structure for a quasicrystal. Thus one may wonder if between the amorphous and the crystalline phases of boron, a non-metallic quasi-crystalline phase could exist. In order to examine this possibility and to cha…
Ab initio calculations based on density functional theory and the pseudopotential method have been used to investigate the adsorption of neutral oxygen atoms on terraces and steps on the MgO (100) surface. The calculations include spin polarisation and gradient corrections, and are performed on periodically repeated s…
A carbon dual-microband electrode coated with a poly(aniline)–poly(vinylsulfonate) composite film exhibits an off-to-on switching response when exposed to NADH at Ph 7; the device takes a few minutes to fully switch conductivity and has a linear response for NADH concentration up to ca. 4 mmol dm–3.
The acidity of a series of MHNaY zeolites (M = Li, K, Rb, Cs) has been studied by CO adsorption at low temperature and pyridine desorption at increasing temperature, both followed by IR spectroscopy. It clearly appeared that the Brønsted acidity decreased in the following order: LiHNaY > KHNaY > RbHNaY CsHNaY. Attenti…
The behaviour of several high Miller index crystal surfaces of gold is examined by cyclic voltammetry in 0.01 mol dm–3 perchloric acid solutions. The potentials of zero charge, Eσ= 0, and their temperature coefficients, dEσ= 0/dT for the stepped faces (332), (771), (320) and (410) are determined from a single minimum…
A generally applicable stoichiometric and kinetic model was developed for the polyesterification of unsaturated dicarboxylic acid with diols in the presence of a homogeneous acid catalyst. The model also incorporates, besides the esterification, the cis−trans isomerization and the double-bond saturation reactions. Rat…
Abstract High‐speed photography has been used visually to study the shape, surface, turbulence and behaviour of an underwater oscillating bubble generated by an airgun. The source was a BOLT airgun with a chamber volume of 1.6cu.in., placed in a 0.85m 3 tank at 0.5m depth. Near‐field signatures were also recorded in o…