Materials Literature
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Silica and stannic (tin) oxide powders were synthesized by oxidation of their respective chlorides in single and double (inverse) diffusion flame reactors. The effect of reac-tant gas mixing on the characteristics of these powders (size and morphology) was investigated by altering the position of the fuel (CH4) and ox…
First-order kinetic behaviour during the thermal isomerization process of lipids with photochromic spiropyran head groups in benzene strongly depends on the dispersion state of the lipids and this enables the determination of their critical aggregation concentrations.
A means of generating foams of high-temperature polymers, polyimides, has been developed for use in dielectric layers in microelectronics. In these systems, the pore sizes generated are in the tens of nanometers range, thus the term “nanofoams”. The foams are generated by preparing phase-separated block copolymers wit…
Biocompatibility Standards: An International Overview (D. Marlowe, et al.). The Role of Material Standardisation and Method Validation in Evaluating Biocompatibility (J. Braybrook). Biodegradation and Toxicokinetic Studies (D. Gott). The Surface Analysis of Polymeric Biomaterials (M. Davies, et al.). Sterilisation Pro…
Mesoporous manganese oxides are prepared by reduction and oxidation mechanisms and by interconversions of layered materials.
The Floquet-Bloch theory is used to develop a theory for grating-assisted directional couplers which predicts the coupled power and coupling lengths and is applicable to lossy waveguides. This theory views grating-assisted directional couplers as conceptually similar to conventional synchronous (nongrating) couplers.…
To investigate the anchoring of precious metals onto carbon fibrils Pd/C-fibril samples were investigated in both the precursor and the reduced state by X-ray absorption fine structure (XAFS) spectroscopy. Analysis of the XAFS data of the freshly prepared catalyst showed a palladium–tetraamine complex in interaction w…
Lanthanide complexes of three classes of polyoxoanions have been characterized by multinuclear ( 183 W and 31 P) NMR spectroscopy among other techniques. The tetrabutylammonium salt of the lacunary [α-2-P 2 W 17 O 61 ] 10- , prepared by metathesis of the potassium salt, was isomerically pure according to 183 W and 31…
The complexes [Ru{2-(CC)C5H3NR-5}(PPh3)2(η-C5H5)] (R = NO2 1 or H 2), [Ni{2-(CC)C5H3NR-5}(PPh3)(η-C5H5)] (R = NO2 3 or H 4) and [Au{2-(CC)C5H3NR-5}L] (L = PPh3, R = NO2 5 or H 6; L = PMe3, R = NO2 7) have been synthesized and 3, 5 and 6 structurally characterized; no significant increase in quinoidal vinylidene contri…
(La 0.8 Sr 0.2 ) 0.9 MnO 3 –YSZ composite particles were synthesized by spray pyrolysis. The mean particle size of the synthesized powders was about 1 pm and the particle size distribution was very narrow. The synthesized powders were composed of the perovskite (La,Sr)MnO 3 and cubic phase YSZ. Each particle synthesiz…
A simple method for the preparation of stable colloidal suspensions of gold nanoparticles in silicate sols, silicate based films and monoliths is presented; organically modified sol–gel monomers containing amine functional groups are used for the stabilisation of Au ions and the metal nanocrystalline sol.
Surface modification of Kapton polyimide film (325 nm thick) by means of chromic acid and perchloric acid at different times and temperatures has been carried out. The contact angle of water decreased from 82 to 55° and the surface energy increased accordingly from 26 to 45 mJ/m2 with times of etching by chromic acid…
Reaction of ligand 2 with CuI ions leads to the self-assembly of the distorted [2 × 2] grid complex 1 of box-like shape, featuring a well defined cavity and trapping of guest molecules.
Adsorption isotherms of nitrogen at 77 K and carbon tetrachloride at temperatures between 273 and 323 K have been determined on the pure silica form of MCM-41 of pore diameter ca. 3.4 nm. The nitrogen isotherm is of a reversible type IV in the IUPAC classification and shows a first-order change in the physisorption me…
The dynamics of the photoinduced cyclization reaction of furyl fulgides has been studied applying femtosecond time-resolved transient absorption spectroscopy. For furyl fulgide 1 and adamantylidene-substituted furyl fulgide 2 in different solvents, a scheme of the reaction mechanism is set up and the reaction rates ar…
We have succeeded in controlling magnetic properties such as the saturation magnetization, the Weiss temperature and the coercive field using compounds in the series (NiIIxMnII1-x)1.5[CrIII(CN)6], by the strategy of choosing both ferromagnetic (J > 0) and antiferromagnetic (J < 0) exchange interactions by using the ap…
Novel soluble unsymmetrical metallophthalocyanines with twelve 2,2,2-trifluoroethoxy groups as donor substituents and a mono-nitro or an exocyclic conjugated nitro group as an acceptor substituent have been synthesized and characterized. A study of the concentration dependence of UV–VIS absorption spectra showed they…
Nebulized spray pyrolysis of metal–organic precursors in methanol solution has been employed to prepare powders of TiO 2 , ZrO 2 and PbZr 0.5 Ti 0.5 O 3 (PZT). This process ensures complete decomposition of the precursors at relatively low temperatures. The particles have been examined by scanning and transmission ele…
A new method to compare the oxygen buffering capacity (OBC) of catalysts shows that Ce–Tb mixed oxide presents an exceptional capability for attenuating fast oscillations of oxygen partial pressure.
Lanthanide complexes of two polydentate N-donor ligands containing a mixture of pyridyl and pyrazolyl donors have been prepared. Dihydrobis[3-(2-pyridyl)pyrazolyl]borate (L 1 ) - is a tetradentate ligand with two bidentate chelating pyridyl/pyrazolyl arms linked by an apical BH 2 group; 2,6-bis(1H-pyrazol-3-yl)pyridin…