Materials Literature
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Polycondensation/pyrolysis of 2,5,8-tricarbodiimide-tris-s-triazine and its derivatives gave hexagonal graphite-like pseudo carbon nitrides, CH0.3–0.08N1.0–0.63, composed of tris-s-triazine nuclei. The materials were stable up to 600–800 °C under an inert atmosphere depending on their nitrogen content.
Adhesive wettability of wood is usually evaluated by contact angle measurement. Because of liquid penetration and spreading on the wood surface, the contact angle changes as a function of time. In this study, a wetting model was developed to describe the dynamic contact angle process in which a parameter (K) can be us…
La[N(SiMe3)2]3 reacted with 1,3-dicyclohexylcarbodiimide in refluxing toluene to yield the mono-guanidinate complex La[CyNC(N(SiMe3)2)NCy](N(SiMe3)2)21. Compound 1 is monomeric in solution; X-ray structural analysis reveals an unassociated complex in the solid state, with a four-coordinate lanthanum center. Complex 1…
Silk fibroin solution was prepared by dissolving the silk fibroin in triad solvent CaCl2 · CH3CH2OH · H2O. In this article we tested and analyzed the state of frozen silk fibroin solution and fine structure of freeze dried porous silk fibroin materials. The results indicated that the glass transition temperature of fr…
TOPO (tri-n-octylphosphine oxide) capped Mn-doped ZnS and Mn-doped CdS nanoparticles have been prepared from bis(diethyldithiocarbamato)zinc(II) or bis(methylhexyldithiocarbamato)cadmium(II) and manganese dichloride. The nanoparticles obtained all show quantum size effects in their optical spectra with respect to the…
The viability of bacteria in the presence of sol–gel reagents has been studied in order to define the best experimental conditions for the sol–gel encapsulation of E. coli. The β-galactosidase activity of these bacteria, trapped in sol–gel silica matrices, was then analyzed. Two routes, using alkoxide and aqueous prec…
Abstract Inelastic mean free path values are needed for quantitative XPS analysis of a range of important polymers and other organic materials. Measured reference data are limited, although some semi‐empirical equations to estimate IMFP are available. Existing estimation methods often require values for such quantitie…
New kinds of hybrid materials containing covalently bonded Eu3+ (Tb3+) bipyridine complexes in a silica network have been prepared and their luminescence properties reported.
Six novel octakis(dialkoxyphenoxy)phthalocyaninatocopper(II) complexes (abbreviated as [(CnO)2PhO]8PcCu (n = 9–14)) have been synthesized. It was found that these derivatives exhibit rich mesophases; Colh, Colr1, Colr2, Colr3, Coltet and Cub phases. These mesophases were characterized by microscopic observation, DSC m…
An intracellular poly[D(-)-3-hydroxybutyrate] (PHB) depolymerase gene (phaZ) has been cloned from Ralstonia eutropha H16 by the shotgun method, sequenced, and characterized. Nucleotide sequence analysis of a 2.3-kbp DNA fragment revealed an open reading frame of 1,260 bp, encoding a protein of 419 amino acids with a p…
This article highlights and discusses our experience in the design, handling, and biological evaluation of long-circulating nanoparticles based on polyoxypropylene/polyoxyethylene copolymer nonionic surfactants. A frequently observed but ignored phenomenon following intravenous injection of such polymer-modified long-…
Dendritic peptides with a carboxylic acid at the focal point of the branched structure form a two-component supramolecular organogel with a linear aliphatic diamine in non-hydrogen-bonding solvents.
It is shown that composite Ru oxide-carbon based supercapacitors possess superior energy and power densities as compared to bare carbon. An electroless deposition process was used to synthesize the ruthenium oxide-carbon composites. Ru is dispersed on the carbon matrix as small particles. The effect of electrochemical…
An HV dielectric spectroscopy system has been developed for diagnostics of water tree deteriorated extruded medium voltage cables. The technique is based on the measurement of nonlinear dielectric response in the frequency domain. Today's commercially available systems are capable of resolving low loss and small varia…
The world around us, natural or man-made, is built and held together by solid materials. Understanding their behaviour is the task of solid mechanics, which is in turn applied to many areas, from earthquake mechanics to industry, construction to biomechanics. The variety of materials (metals, rocks, glasses, sand, fle…
A ruthenium oxide thin film electrode with an average specific capacitance of 650 F/g and good high rate capability was prepared by electrostatic spray deposition (ESD). This technique is a one-step process of preparing ruthenium oxide thin film electrode compared with a multistep sol-gel process and has features of l…
Single crystals of [Cu(en)2(OH2)]2[H2en][{Cu(en)2}P2CuW17O61]·5H2O 1, [Cu(en)2(OH2)]2[Cu(en)2]0.5[H2en]0.5[{Cu(en)2}P2CuW17O61]·5H2O 2 and [Co(dpa)2(OH2)2]2[Hdpa][PCoW11O39] 3 (dpa = di-2-pyridylamine) have been hydrothermally synthesized and characterized by IR, TGA and single-crystal structural analysis. Compounds 1…
Monodispersed nanocrystalline CeO2 powders of size ca. 2.0 nm displaying quantum size effects have been prepared by microwave irradiation in an aqueous solution containing (NH4)2Ce(NO3)6, PEG and NaAc.
Based on a nonlinear optical polymer with a highly nonlinear chromophore (CLD) dispersed in an amorphous polycarbonate (APC), we have developed electrooptic (EO) polymer modulators operating at 1550-nm wavelength with low loss and good thermal stability. By incorporating polymer insulation layer, push-pull poling was…
Cytochrome c (horse heart) has been adsorbed onto a range of mesoporous silicate materials with the extent of adsorption dependent on the silicate pore size; adsorption and activity profiles of the adsorbed protein are reported.