Materials Literature
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Transition metal complexes of o -semiquinone (SQ) ligands have been studied extensively over the past 25 years. A particularly interesting aspect of this coordination chemistry concerns magnetic interactions between paramagnetic metal ions and the radical anionic ligands. In this review we begin with a survey of relat…
Medical science continues to battle against the loss or failure of organs or tissues. Since, skeletal muscle loss lead not only to the functional compromise of the affected site, but also a structural deformation; tissue engineering of skeletal muscle attempts to provide solutions to replace loss of tissue contour and…
The formation of space charge packets in crosslinked polyethylene (XLPE) tapes from un-aged cable insulation has been studied utilizing the pulsed electroacoustic (PEA) technique. The 150 /spl mu/m thick sheets were studied under constant applied DC field of 120 kV/mm at a temperature of 20/spl deg/C for a period of 4…
The preparation of a series of aminopropyl-substituted micelle templated silicas is presented, in which the materials are synthesised by a one-step co-condensation route using dodecylamine as template. The effect of solvent composition on the material properties, reactivity and catalytic activity is discussed. Increas…
Several new bulky salen-type Schiff base ligands and their complexes with first-row transition metals Co, Cu, Fe, Mn and Ni have been synthesized and characterized. The ligands contain tert-butyl and methyl(triphenylphosphonium chloride) substituents in aromatic rings providing flexible solubility properties. Crystal…
Ag–Al2O3 catalyst prepared by the sol–gel method was studied for the selective catalytic reduction (SCR) of NO by various hydrocarbons (HC-SCR). The rates of NO reduction and hydrocarbon conversion depend strongly on the type of hydrocarbon reductant; the rates were higher for the higher normal alkanes, higher for alk…
The one-dimensional polymer [Ru2(O2CCF3)4(Phz)]∞1 (Phz = phenazine) was synthesized by the reaction of RuII2(O2CCF3)4(THF)2 with phenazine. An X-ray crystallographic analysis revealed that the compound consists of Ru2(O2CCF3)4 units bridged by phenazine ligands. The Ru–Ru bond distance is 2.3109(10) Å and the axial Ru…
In situ electrochemical impedance spectroscopy was used to study the characteristics of the passive film formed potentiodynamically on copper, in slightly alkaline solution. This film has semiconducting properties. A strong correlation was established between the impedance and the changes in the composition and struct…
An inner- and outer-N coordinated bis-Rh(I) metal complex was obtained from the reaction of N-confused porphyrin and [Rh(CO)2Cl]2 in CH2Cl2 and the structure was confirmed by a single crystal X-ray analysis.
Variation of the ferroelectric phase transition has been investigated for a series of isomorphous donor (D)-acceptor (A) charge-transfer complexes composed of 4,4'-dimethyltetrathiafulvalene (DMTTF) and tetrahalo-p-benzoquinones by measurements of dielectric susceptibility, X-ray diffraction, and infrared molecular vi…
The tailoring of the lower critical solution temperature (LCST) polymers of acrylamide and methacrylamide in water is achieved by chemical modification of freely water soluble precursor polymers poly[N-2-hydroxypropylmethacrylamide], poly[N,N-bis(hydroxyethyl)acrylamide] and poly[N-{tris(hydroxymethyl)methyl}acrylamid…
The electrical properties of perovskite-related oxide La0.3Sr0.7Fe1 - xGaxO3 − δ (x = 0–0.5) are reported within the temperature range 750 to 950 °C and the oxygen partial pressure range between 10−19 and 0.5 atm. The maximum solid solubility of gallium in the iron sublattice of La0.3Sr0.7FeO3 − δ is close to 30%. At…
The determination of tetracyclines (TC) in aqueous solutions, based on europium-sensitized fluorescence, has been improved using EDTA as co-ligand and cetyltrimethylammonium chloride as surfactant. The method involves working in slightly alkaline solutions with the formation of a new chelate where the lanthanide ion i…
We report both experimental measurements and molecular simulations of the melting and freezing behavior of two dipolar fluids, water and methanol, in activated carbon fibres. Differential scanning calorimetry (DSC) and dielectric relaxation spectroscopy (DS) were used to determine the melting point in these porous mat…
An account is presented of recent work on specially synthesised diblock, triblock and cyclic block copolymers of ethylene oxide and 1,2-butylene oxide. Simultaneous small-angle X-ray scattering and differential scanning calorimetry have been used to investigate the effects of block architecture on the stabilities and…
Citric acid has been employed as a structural modifier for the first time to synthesize single silica nanotubes via a sol–gel process at room temperature. XRD results reveal the amorphous nature of the silica framework. SEM and TEM images show that the nanotubes were 0.5–20 µm in length, and 50–500 nm in width. TG-DTA…
A nonplasma technique, hot-filament chemical vapor deposition (HFCVD), is an alternative method for producing organosilicon films of novel structure. Films are deposited onto room-temperature substrates from the precursors hexamethylcyclotrisiloxane and octamethylcyclotetrasiloxane at high rates (>1 μm/min). Filament…
Dendron-stabilized gold nanoparticles synthesized with Fréchet-type dendrons possessing a single thiol group at the focal point have small cores (average diameters of 2.4–3.1 nm) with narrow size distribution and remarkably high stability; in particular, the nanoparticles synthesized with the second generation dendron…
The mesoporous siliceous SBA-15 molecular sieve was synthesized and post-synthesis alumination was carried out using trimethylaluminium (TMA). It was found that the aluminium could be easily incorporated into the siliceous framework of SBA-15 without serious structure deformation. From detailed characterization of the…
A linear coordination polymer composed of diarylethene and bis(hexafluoroacetylacetonato)zinc(II) has been synthesized and its photochromism in the single-crystalline phase studied by polarized absorption spectroscopy.