Materials Literature
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Electrochromic (EC) behaviours of nickel oxide (NiOx) thin films, grown by chemical process in a nickel ammine complex solution [Ni(NH3)x2+] after electrolysis of this solution (EL–C method), were investigated using various alkaline electrolyte solutions; potassium borate buffer (pH 12), KOH (pH 12.9), (CH3)4NOH and (…
Atomic stresses were calculated for carbon nanotubes under strain conditions. Graphitic tubules with radii ranging from approximately 2 to 11Åand two different tubule structures with varying atomic orientations were included in the calculations. Elongations and contractions were applied in the axial direction and atom…
The protonation constants (K iH) of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (H4dota) were redetermined at 25 °C in 0.1 M NMe4Cl. The log Ki H values (i = 1–5) are 12.6, 9.70, 4.50, 4.14 and 2.32, respectively. The stability constants of [Ce(dota)]– and [Yb(dota)]– were determined by pH-potentiometry a…
Polymeric blends of silk fibroin (SF) and S-carboxymethyl kerateine (SCMK) were prepared by the solvent casting method to study the effect of surface properties on the antithrombogenicity. The films of SF/SCMK showed better antithrombogenic properties than SF or SCMK alone. Among them, the film containing 50 wt% SCMK…
New methodology was developed for the selective synthesis of regiochemically defined porphyrazines of the form M[pz(A 2;B 2 )] (shown in Chart 1) where A and B represent peripheral functionalization attached to the β-positions of the pyrroles. Specifically, phthalonitriles or derivatives thereof with sterically bulky…
A number of dendrimers based on polyhedral silsesquioxane cores have been synthesised and characterised. The new molecules are prepared by repetitive hydrosilation/alkenylation reactions, which provide a facile and high yield route to dendrimers with a high density of branch ends per generation. Judicious choice of hy…
The electromagnetic microwave absorption properties of Barium M-type ferrite, in which Fe3+ was substituted by (Ti0.5Mn0.5)3+, were investigated in the GHz frequency range. The anisotropy field (HA) of Barium M-type ferrite can be changed by varying the Ti0.5Mn0.5 content, which enables the natural resonance frequency…
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…