Materials Literature
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The kinetics of the reaction for the formation of monocalcium aluminate (CaAl 2 O 4 ) using 1:1 molar mixtures of A.R. grade calcium carbonate and A.R. α-Al 2 O 3 or gibbsite have been investigated in the range 1150–1400 °C using quantitative X-ray diffraction analysis. The phases Ca 3 Al 2 O 6 and Ca 12 Al 14 O 33 we…
Complexes 1a·EuIII and 1b·EuIII, but not 1a·TbIII and 1b·TbIII, display strong ‘off–on’ switching of delayed luminescence with alkali cations; the switching efficiency of 1b·EuIII is stronger with K+ rather than Na+.
Materials combining the best properties of plastics and ceramics , i.e., that are as heat and combustion resistant as ceramics and as moldable and light as plastics, would find many applications. As a step in this direction, the preparation and properties of a silicon‐based organic polymer, MSP, which includes the Si(…
A scanning electrochemical technique is used to show the influence of differential aeration on the kinetics and mechanism of corrosion reactions occurring at the exposed edge of galvanised sheet steels overcoated with organic layers of dissimilar thickness.
A layered double hydroxide (LDH) with chemical composition LiAl2(OH)7 ·2H2O was prepared via a wet chemical route of gel to crystallite (G–C) conversion at 80 °C involving the reaction of hydrated alumina gel, Al2O3 ·yH2O (80<y<120) with LiOH (Li2O/Al2O3 ≥0.5) in presence of hydrophilic solvents such as ethanol under…
Complexation of aluminium and gallium ions with synthetic anthocyanin models and natural anthocyanins extracted from the blue flowers of Evolvulus pilosus cv ‘Blue Daze’ and the violet flowers of Matthiola incana has been thoroughly investigated in aqueous solution. From UV–VIS spectroscopic data collected at pH 2–5,…
The main models for combined thermal-electrical ageing of electrical insulation have a common origin in thermodynamics, and several of the models are essentially the same.
We examined the relationship between collagen crosslinking techniques and dentinum reinforcement. In the present study, the tensile tests, imbibition test and antienzyme test were performed on collagen films mainly composed of type I collagen after ultraviolet irradiation and immersion in tannic acid and glutaraldehyd…
Presents a way to relate two standard models for magnetomechanical hysteresis-the Sablik-Jiles-Atherton model and the Schneider-Cannell-Watts model-while at the same time presenting physical models for the asymmetry in magnetic property behavior under tensile and compressive stress in steel, including, for /spl sigma/…
Abstract A method is presented to synthesize drowning‐out crystallization‐based separation schemes for binary mixtures. The method tracks how the composition of each process stream changes from unit to unit on a phase diagram by assuming that the system is at equilibrium. Features of phase behavior favorable to drowni…
The photocyclization quantum yield of 2,2′-dimethyl-3,3′-(perfluorocyclopentene-1,2-diyl)bis(benzo[b]thiophene-6-sulfonate) is found to increase in aqueous solution after the addition of β- and γ-cyclodextrin, in which a photoreactive antiparallel conformation of diarylethene is favourably included.
LaNiO 3 thin films have been deposited in an atomic layer epitaxy (ALE) reactor, using La(thd) 3 , Ni(thd) 2 and ozone as reactants, thereby proving the feasibility of the ALE technique to produce films of ternary oxides. Depositions were made on Corning glass in the temperature range 150–450 °C. The growth conditions…
Abstract The syntheses, crystal structures, and physical properties of some recently discovered layered ternary and quaternary chalcogenides are reviewed. One component of these systems is an alkali metal or thallium; another is a d‐, f‐, or p‐ block metal.
The electrochemically triggered rearrangement of a copper catenate is monitored by EPR spectroscopy; the initially generated tetrahedral copper(II) complex (with higher g-factor components and lower metal hyperfine splitting) is converted to a stable five-coordinate copper(II) species, within a few minutes at room tem…
Three mixed-valence polyoxovanadates, Na 12 H 2 [V 18 O 44 (N 3 )]·30H 2 O 1, K 8.5 H 2.5 [V 18 O 42 (PO 4 )]·19H 2 O 2 and H 15 [V 12 B 32 O 84 Na 4 ]·13H 2 O 3 have been photochemically synthesized and characterized by X-ray single-crystal analysis and magnetic susceptibility measurements. The [V 18 O 44 (N 3 )] 14-…
Abstract The morphological features of ZnO crystallites influenced by solution basicity under hydrothermal conditions have been studied from the standpoint of the incorporation of the growth units. A crystal chemistry approach is developed to understand and thus to control a desirable morphology of the crystallites. T…
A novel approach for the synthesis of 5,5′-directly linked metal-free bis-porphyrins is reported; McMurry type coup-ling of dipyrroketones (e.g. 1) leads to 1,1,2,2-tetra(2-pyrrolyl)ethene 2, which after tetra-formylation (to give 3) and MacDonald macrocyclization with a 1,9-di-unsubstituted dihydrodipyrrin 4, affords…
Ferroresonance in electromagnetic voltage transformers, fed through circuit breaker grading capacitance, is studied using nonlinear dynamics methods. The magnetising characteristic of a typical 100 VA voltage transformer is represented by a single-valued two-term polynomial of the order seven. The system exhibits thre…
Electronic structure calculations of cubic ${\mathrm{SrTiO}}_{3}$ and ${\mathrm{SrHfO}}_{3}$ are presented. The full-potential linear augmented-plane-wave method is used and exchange-correlation effects are treated by the local-density approximation. The tendency to ferroelectricity of both compounds is explored and c…
The solid superacid-catalyzed depolymerization−liquefaction (DL) reactions of high-density polyethylene (HDPE), isotactic polypropylene (PPR), and cis -polybutadiene (PB) samples were systematically investigated as a function of processing conditions, i.e., temperature (350−450 °C), time (0.5−3.0 h), H 2 pressure (500…