Materials Literature
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Abstract Surface‐enhanced Raman spectroscopy (SERS) spectra have been obtained for different species (CO, CN − , ethylene and oxalic acid) adsorbed on nanostructured electrodes prepared by deposition of Pt, Pd, Rh and Pd:Pt nanoparticles on either gold or platinum electrodes. These examples not only refer to stable ad…
Abstract Pyridine as a typical model molecule has been most extensively studied by SERS for three decades. However, there has not been a satisfactory explanation for the dramatic change of the relative intensity of the two main bands assigned to the total symmetric modes at 1008 and 1035 cm −1 when pyridine was adsorb…
Reliability of interconnect via is increasing an important issue in submicron technology. Electromigration experiments are performed on line/via structures in two level Cu dual damascene interconnection system and it is found that wide line/via fails earlier than the narrow line/via. Atomic flux divergence based finit…
During free surface moulding processes such as thermoforming and blow moulding, heated polymer materials are subjected to rapid biaxial deformation as they are drawn into the shape of a mould. In the development of process simulations, it is therefore essential to be able to accurately measure and model this behaviour…
A giant light-harvesting antenna-acceptor composite was constructed by heterodimerization of imidazolylmanganese(III)porphyrin to molecular terminals of the zinc porphyrin array composed of meso-meso linked bis(imidazolylzincporphyrin). Fluorescence quenching titration indicated that the terminal imidazolylmanganase(I…
We used an ab initio embedded cluster method to study and compare three charged states of the Si-Si dimer configurations of oxygen vacancies in α-quartz and amorphous silica. The Si–Si bond in the neutral vacancy remains largely the same in both crystalline and amorphous SiO2. In α-quartz the positively charged dimer…
A high voltage composite insulator showed severe degradation and failure of the silicone elastomer sheds following service in a substation environment. Sensitive analytical techniques were used to investigate the extent of degradation of the silicone elastomer (SiE). The polymer content of some surface regions decreas…
This paper reports on compact tunable true-time delay lines based on ferroelectric (Ba/sub 0.25/Sr/sub 0.75/TiO/sub 3/) varactors integrated on high-resistivity silicon. The delay lines are based on lumped elements, physically implemented as synthetic coplanar-strip lines. An approximate analytical design procedure, e…
A hybridization strategy for the covalent connection of single wall carbon nanotubes to silicon surfaces via oligo(phenylene ethynylene)s has been demonstrated using an orthogonal bisdiazonium functionalization protocol.
Lipase-catalyzed ring-opening polymerizations of 4-substituted ε-caprolactones employing Novozym 435 as the biocatalyst demonstrate dramatic differences in polymerization rates and selectivity depending on the size of the substituent. Quantification of the reaction rates shows that the polymerization rate decreases by…
The shape demagnetizing factors of a planar magnetic insulator are of some interest in the design of a number of microwave ferrite components. One means of experimentally evaluating these quantities, in the case of a disk geometry, is to measure the Kittel line and to make use of a standard identity. Another method, i…
Unsaturated polyesters were synthesized in the laboratory by the condensation of maleic anhydride and phthalic anhydride with propylene glycol. The condensate obtained was mixed with styrene monomer to get an unsaturated polyester resin formulation. The properties of the polyester resin synthesized were found to be af…
There is a strong criticism against usage of buffered ammonium acetate as an extractant for the determination of exchangeable elements in acid soils dominated by low‐activity clays. There are several reports regarding the use and misuse of diethylene triamine penta acetic acid as a universal extractant for iron, manga…
Abstract In this work, we used HNO 3 /HF Vapour Etching (VE) of silicon (Si) wafers for the formation of different porous structures. Depending on the volume ratio of the HNO 3 /HF acid mixture, we can obtain Porous Silicon (PS) layers or a (NH 4 ) 2 SiF 6 like powder phase. These two kind of porous structures may be…
This study fabricated polyurethane foam after transforming the cell structure from a convex polyhedral shape to a concave shape. Polyurethane was synthesized and fabricated after changing the cellular structure of the foam using two methods. Scanning electron microscopy showed that the cellular structure was a more co…
Article Structure-Property Relationships in Polyoxymethylene/Thermoplastic Polyurethane Elastomer Blends was published on June 1, 2005 in the journal Journal of Polymer Engineering (volume 25, issue 4).
The effects of Ho (holmium) doping on the electrical properties and microstructural development of (Ba 1- x Ho x )TiO 3 were investigated by means of defect chemistry on the basis of equilibrium electrical conductivity data measured at 1300°C, as a function of oxygen activity. Ho 2 O 3 additions to BaTiO 3 up to 0.3 m…
This study evaluates the impact of certain finishing formulations, posttreatment with copper acetate as well as type of cotton fabric on the easy-care properties and UV protection of treated fabrics. The results detailed in this article indicate that (1) increasing the finishing agent concentration results in a signif…
A bacterial strain M4-7 capable of degrading various polyesters, such as poly(epsilon-caprolactone), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxyoctanoate), and poly(3-hydroxy-5-phenylvalerate), was isolated from a marine environment and identified as Pseudomonas alcaligenes. The relative molecular mas…
Qualitative analysis of the factors governing variation in T c and P s of PbTiO3, KNbO3 and BaTiO3 members of ABO3 perovskite family considering the parameters like tolerance factor, t, electronic configuration, electronegativity, polarizability and character of bonding using molecular orbital theory (MOT) reveals tha…