Materials Literature
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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.
This contribution briefly introduces the traditional acceptor doping of oxides, charge compensated by oxygen vacancies to bring about the oxygen ion conduction utilised in solid oxide electrolytes. It is next shown how a simple defect–chemical approach to defect–defect interactions is a useful first-approximation tool…
LixNi0.30Co0.70O2 phases obtained by electrochemical deintercalation have been characterised by XRD, 7Li MAS NMR, electronic conductivity and thermoelectronic power measurements. Ni3+ oxidation to Ni4+ occurs at the onset of deintercalation, leading to Ni3+/Ni4+ hopping which causes an exchange of the 7Li NMR signals,…
Three-dimensional erasable optical recording in a single crystal of 1, 2-bis(3-methyl-2-thienyl)perfluorocyclopentene (1), which shows a reversible fluorescence change with the photochromic reaction, has been demonstrated. The recorded spot size read by a fluorescence-detection method was approximately 200nm in plane…
Ruthenium oxide films were grown on metal substrates at temperatures from 100 to 300°C using a ruthenium ethoxide solution as the precursor. The amorphous phase and highly porous ruthenium oxide films were formed at temperatures of 200°C and lower. A specific capacitance of 593 F/g and an interfacial capacitance of 4…
The CMR manganites Ln1 − xAxMnO3 with the perovskite structure form a very important family of magnetic oxides, studied for their fascinating colossal magnetotransport properties. In this review, we discuss two phenomena, charge ordering and phase separation, which are crucial for the appearance of CMR in these oxides…
Using vesicular polymerization, water-soluble polyelectrolyte nanocapsules have been prepared, that are able to undergo a reversible swelling transition upon changing the pH and/or salt concentration.