Toward new paradigms in mixed-valency: ytterbocene–terpyridine charge-transfer complexes
(C5Me5)2Yb x OEt2 reacts with terpyridine and tetrapyridinylpyrazine to afford new mixed-valent systems.
Materials Literature
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Electrical properties of MgO-doped BaTiO 3
The defect chemistry of Mg-doped BaTiO3 has been quantitatively studied. BaTi1−xMgxO3−x samples (x = 0, 0.001, 0.005, 0.01, 0.012, 0.02) have been precisely synthesized by the Pechini method. The concentration of oxygen vacancies was estimated from the location of the oxygen partial pressure P°(O2) at which the minimu…
Photoresponsive melamine·barbiturate hydrogen-bonded assembly
UV-irradiation of hydrogen-bonded assembly between trans-azobenzene-incorporated melamine and barbiturate in chloroform drastically suppressed transformation from soluble cyclic rosette into insoluble tape-like polymers.
Synthesis, structure, and preliminary magnetic studies of unprecedented hexacopper( ii ) barrel clusters with spin ground state S = 3
The structure of a discrete hexacopper(II) barrel cluster and that of a coordination polymer formed by a related hexanuclear repeating unit have been determined. The CuII metals of the hexanuclear units are held together by eight chelating L-prolinato type ligands, which in turn provide the eight oxygen donors trappin…
Ionic Transport in Gd[sub 3]Fe[sub 5]O[sub 12]- and Y[sub 3]Fe[sub 5]O[sub 12]-Based Garnets
The oxygen permeability of dense garnet-type and membranes at 1173-1273 K is limited by the bulk ambipolar conductivity. The ion transference numbers, calculated from results on the oxygen permeation and total conductivity, vary from to increasing with temperature. Ionic conduction in ferrite garnets, primarily determ…
The Kinetics of Chloride-Induced Filiform Corrosion on Aluminum Alloy AA2024-T3
A scanning Kelvin probe (SKP) is used to study the kinetics and mechanism of filiform corrosion (FFC) as it occurs on polyvinyl butyral-coated AA2024-T3 aluminum alloy. In order to control the quantity of electrolyte entering the filament-head population, FFC is initiated by injecting a measured quantity of aqueous HC…
Comparison of Emeraldine Salt, Emeraldine Base, and Epoxy Coatings for Corrosion Protection of Steel During Immersion in a Saline Solution
The performance of polyaniline coatings (both emeraldine salt [ES] and emeraldine base [EB] forms) have been compared with epoxy coatings for corrosion protection of plain carbon steel in a saline solution. The corrosion rate was estimated by determining the concentration of dissolved iron in the test solution as a fu…
Gadolinium-labeled dendrimers as biometric nanoprobes to detect vascular permeability
PAMAM dendrimer-based biometric nanoprobes G4-1B4M-Gd, G6-1B4M-Gd and G8-1B4M-Gd were used to detect vascular permeability in SCCVII mice tumors. Based on the whole body clearance curve, G8-1B4M-Gd emerged as the ideal candidate for vascular permeability imaging studies due to its stable signal enhancement in the tumo…
Pair interaction and phase separation in mixtures of colloids and excluded volume polymers
The interactions in polymer–colloid mixtures and their phase stability are calculated using the adsorption method. Starting from appropriate expressions for the correlation length and the osmotic pressure of a polymer solution in the excluded volume interaction limit, this method allows computation of the potential be…
Photo-sensitive sol–gel solutions for the low-temperature UV-assisted processing of PbTiO 3 based ferroelectric thin films
Photo-sensitive PbTiO3 solutions were synthesised by a sol–gel process that combines the use of a diol solvent, HO(CH2)3OH, and a titanium alkoxide modified with a β-diketonate, Ti(OC3H7)2(CH3COCHCOCH2)2. O-Nitrobenzyl alcohol (NBA), 1-hydroxy-cyclohexyl-phenyl-ketone (HPK) and acetylacetone (ACACH) were added to the…
Grain Refinement in As-Cast 7475 Aluminum Alloy under Hot Equal-Channel Angular Pressing
Microstructural evolution taking place during equal channel angular pressing (ECAP) was studied in an as-cast 0.16%Zr modified 7475 aluminum alloy at a temperature of 673 K. The structural changes are characterized by development of deformation bands due to large strain inhomogeneity occurring through the ECAP die. Re…
A first example of polyoxotungstate-based giant molecule. Synthesis and molecular structure of a tetrapod-shaped Ti–O–Ti bridged anhydride form of Dawson tri-titanium( iv )-substituted polyoxotungstate
The preparation and structural characterization of a giant “tetrapod”-shaped inorganic molecule, [(α-1,2,3-P2W15Ti3O60.5)4Cl]37− ,1a (abbreviated to {TiO6}12; FW ∼15700), consisting of four tri-TiIV-1,2,3-substituted α-Dawson substructures and one encapsulated Cl− ion, are described. A water-soluble, all-inorganic com…
Formation of calcium phosphate having a hierarchically laminated architecture through periodic precipitation in organic gel
Hierarchically laminated calcium phosphate was produced through Liesegang periodic precipitation in a gel matrix of poly(acrylic acid) containing phosphate anions by diffusion of calcium cations.
Lewis Acid/Lewis Base Effects in Corrosion and Polymer Adhesion at Aluminum Surfaces
Lewis acid/Lewis base (electron acceptor/electron donor) interactions are important in the breakdown of oxide films on aluminum by chloride ions and in the adhesion of organic polymers onto oxide-covered aluminum surfaces. This paper considers the pitting of aluminum by (a Lewis base) in terms of the acid-base nature…
Mesostructured iron and manganese oxides
Despite the great potential for mesostructured transition metal oxides to exhibit interesting properties, strategies for synthesising these materials are much less developed than is the case for the corresponding silicates and aluminosilicates, despite important pioneering work. Here, following such pioneering work, w…
Properties and Regulation of the Bifunctional Enzyme HPr Kinase/Phosphatase in Bacillus subtilis
The bifunctional allosteric enzyme HPr kinase/phosphatase (HPrK/P) from Bacillus subtilis is a key enzyme in the main mechanism of carbon catabolite repression/activation (i.e. a means for the bacteria to adapt rapidly to environmental changes in carbon sources). In this regulation system, the enzyme can phosphorylate…
Shape memory ferromagnets
In ferromagnetic alloys with shape memory large reversible strains can be obtained by rearranging the martensitic domain structure by a magnetic field.Magnetization through displacement of domain walls is possible in the presence of high magnetocrystalline anisotropy, when martensitic structure rearrangement is energe…
Retardation of oil drop evaporation from oil-in-water emulsions
The rate of evaporation of volatile oils from oil-in-water emulsions can be strongly retarded by using a polymeric emulsion stabiliser instead of a low molar mass surfactant.
Synthesis, characterisation and optical properties of nanocrystalline Y 2 O 3 –Eu 3+ dispersed in a silica matrix by a deposition–precipitation method
A Eu3+-doped-yttria–silica nanocomposite was synthesized through a deposition–precipitation technique. Yttria nanocrystalline particles with a mean size of 12 nm, dispersed in an amorphous silica matrix, were evidenced by XRD and TEM in a sample treated at 900 °C. The nanoparticles are coated with an amorphous layer v…
A novel azobenzene-based amorphous molecular material with a spiro linked bifluorene
A novel, high Tg azobenzene-based amorphous molecular material, spiro-ADA, was designed and synthesized via a palladium catalyzed amination reaction. The introduction of bulky spiro linked bifluorene with the non-planar structure of triphenylamine of spiro-ADA prevented crystallization of the molecules and led to good…