Materials Literature
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Exposure of the polymeric solid [CuI(4-pic)]∞ to either liquid or vapor toluene leads to disappearance of this material’s characteristic room temperature blue emission (λmax 437 nm) and the appearance of the yellow emission (λmax 580 nm) indicative of the [CuI(4-pic)]4 tetramer; the process is reversed when the latter…
Constant voltage anodizing of binary Mg‐Al alloys containing 2, 5, 8, and 12% of aluminum was studied. Anodizing was conducted in a bath containing 3 M KOH + 0.6 M KF + 0.21 M with additions of 0.013, 0.064, 0.13, and 0.4 M of . A thin amorphous film was formed during the first stage of anodizing. Prolonged anodizing…
Spectroscopic properties of Er3+ in Ga2S3–GeS2–La2S3 glasses are investigated on the basis of the spontaneous emission probabilities calculated by the use of the Judd–Ofelt theory and lifetime data. Frequency upconversion spectra are also measured with excitation at 800 and 980 nm. The spontaneous emission probabiliti…
Addition of MgO to Al-doped ZnO was successful in reduction of the phonon thermal conductivity,κph , in order to suppress the unfavorably high thermal conductivity, κ, of the material in terms of applications to thermoelectric conversion. The electrical conductivity, σ, of Zn0.98Al0.02O decreased with increasing amoun…
IR spectroscopy was used to study CO adsorption on two samples of 5%Co/Al2O3. By variation of sample pretreatment, CO pressure, contact time and mode of hydrogen coadsorption, several surface species were identified: CO adsorbed on cobalt ions of different oxidation state, CO on metallic cobalt and polycarbonyls. Thre…
Ozone has been used to remove the organic surfactant species at 250 °C from as synthesised organic/inorganic composite (or mesophase) materials to form mesoporous MCM-41 type solids with higher surface area, larger pores and narrower pore size distribution than those obtained by conventional calcination at 550 °C.
The complex [{Ru(bipy)2}3(µ3-L)]3+ (H6L = hexahydroxytriphenylene), in which the tris-dioxolene bridging ligand is formally in the tris-semiquinone oxidation state [sq,sq,sq], undergoes three reversible ligand-centred oxidations to the [q,q,q] state (q = quinone); it exhibits very strong NIR absorption arising from Ru…
The synthesis of palladium-containing electroactive polymer microparticles has been carried out. The process involved three steps: synthesis of electroactive polymer microparticles with or without SiO2, reduction of the electroactive polymer and uptake of palladium from acid solutions. The electroactive polymers used…
We provide a brief non-comprehensive survey of some recent work on the insitu production of metal nanoclusters in polymer films. The synthesis schemes rely on the well-known spontaneous microphase separation of block copolymers to restrict metal species within nanoscale regions in the bulk morphology. In one variation…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTransient Spectroscopy of a Derivative of 2,2-Difluoro-1,3-diphenylcyclopentane-1,3-diylA Persistent Localized Singlet 1,3-DiradicalWaldemar Adam, Weston Thatcher Borden, Clemens Burda, Heather Foster, Thomas Heidenfelder, Markus Heubes, David A. Hrovat, Fumio Kita, Sc…
We have obtained visible range polarization spectra of template-synthesized gold nanoparticles oriented in polyethylene (PE). The plasmon resonance extinction bands observed with the incident electric field polarized parallel, perpendicular, and at intermediate angles to the direction of friction orientation are consi…
The study presented addresses the fire behaviour of polypropylene compounded with six classes of flame retardants. The application of cone calorimetry for the assessment of the thermal characteristics of the tested materials and their comparison with thermogravimetry are the central point of this research. This study…
Sodiump-nitrophenolate dihydrate (NPNa) is a new semiorganic nonlinear optical crystal. It has a deff of about 1.2 times that of potassium titanyl phosphate. Large single crystals of NPNa were grown from water and methanol solutions by isothermal solvent evaporation. The morphology of the grown crystals was indexed. T…
The thin-layer wicking technique was used to determine the surface free energy components and the surface character of three celluloses (Sigmaccll 101, Sigmacell 20, and Avicel 101), using an appropriate form of the Washburn equation. For this purpose, the penetration rates of probe liquids into thin porous layers of…
Nanocomposites with fine, coarse, and bimodal silicon carbide (SiC) particle‐size distributions were hot pressed and examined by transmission electron microscopy, scanning electron microscopy, and optical microscopy, as well as by four‐point‐bend and indentation tests. The finer SiC nanophase was introduced homogeneou…
The influence of the mass transfer phenomena on the thermal decomposition of calcium carbonate powders under vacuum was investigated through a detailed kinetic analysis by the constant transformation rate thermal analysis (CRTA). Reliable kinetic curves, free from the mass transfer problems, can be obtained by CRTA un…
The effects of phosphate limitation and of the presence of marine bacteria during phosphate limitation on growth and polysaccharide production in the diatom Cylindrotheca fusiformis grown in batch cultures are described in this paper. Growth of C. fusiformis was inhibited under low Pi (inorganic phosphate) conditions,…
An integrated method for modeling chemical vapor deposition on length scales ranging from microns to meters has been developed. The macroscale problem of flow and transport in a single wafer, low pressure chemical vapor deposition reactor is solved using the finite element method. However, on the feature scale, contin…
A novel synthetic route to diarylethenes fixed in a cyclopentene based on titanium-mediated carbonyl coupling leads to bis(3-thienyl)cyclopentenes that show photochromic behaviour similar to that of known diarylethenes.
Ceramic (Si3 N4 /SiC) composites have been produced by sintering. From the sintered block, three point bend specimens were cut out. A semi‐circular crack was made on the centre of the tension surface of the test specimen with the aid of a Vicker’s indenter. The diameter of the semi‐circular crack was about 60–70 μm. T…