Materials Literature
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Tin doped indium oxide (ITO) films are highly transparent in the visible region, exhibiting high reflectance in the infrared region, and having nearly metallic conductivity. Owing to this unusual combination of electrical and optical properties, this material is widely applied in optoelectronic devices. The associatio…
The processing, electromechanical properties, and microstructure of lead zirconate titanate (PZT) ceramics over the grain‐size range of 0.1‐10 μm were studied. Using measurements over a large temperature range (15‐600 K), the relative role of extrinsic contribution (i.e., domain‐wall motion) was deduced to be influenc…
To withstand the high intracellular pressure, the cell wall of most bacteria is stabilized by a unique cross-linked biopolymer called murein or peptidoglycan. It is made of glycan strands [poly-(GlcNAc-MurNAc)], which are linked by short peptides to form a covalently closed net. Completely surrounding the cell, the mu…
Abstract
Phase morphology and mechanical properties of the blends of Nylon 6 with scrap poly(vinyl butyral) (PVB) film and poly[styrene-block-(ethylene-co-butene)-block-styrene] (SEBS) have been investigated. Scanning electron microscopic photographs revealed that the spherical PVB particles are finely and uniformly dispersed…
Chemical behavior of lithium ions in reexpanded lithium−montmorillonites has been investigated, their hydration capacity, interlamellar availability, and thermal reactivity being examined. Two experiments have been carried out: a thermal treatment to evaluate the possible recollapse of the sample, and an ionic exchang…
The acrylic fibers containing 10.8 wt % of acrylic acid as a comonomer were treated with 5% aqueous solution of sulphates of alkali metals (sodium and potassium) and transition metals (cobalt and nickel) at 90°C for 5 min. The effect of this treatment on the chemical structure, thermal behavior and mechanical properti…
We have investigated by dynamic light scattering the dynamics of semidilute polymer solutions in a good solvent, specifically polystyrene in benzene. We have shown that, using state-of-the-art instrumentation and data analysis techniques, it is possible to identify in the spectra of relaxation times three very weak sl…
Magnetic resonance imaging often utilizes paramagnetic contrast agents (PCAs) to increase contrast between adjacent tissues. PCAs enhance the contrast by increasing the spin−lattice proton relaxation rate through processes known as inner-sphere, second-sphere, and outer-sphere mechanisms. Past studies on PCAs often de…
The phase morphology of PC/ABS blends can be significantly affected by its processing conditions. Blends prepared in a mixing chamber at different conditions show a strong influence of mixing time and temperature on its morphology. The blend morphology changes from a well-dispersed PC phase surrounded by the ABS matri…
The geometry of crambin, a protein with 46 residues, was determined by ab initio HF/4-21G geometry optimization. The results are compared with the crystal structure of the compound and with HF/4-21G φ,ψ-conformational geometry maps calculated for the model dipeptide N -acetyl- N ‘-methylalaninamide. Root-mean-square (…
Abstract
The molecular orientation at the surface of polyimide (PI) alignment layers used for liquid crystal displays has been determined using X-ray absorption spectroscopy (NEXAFS). The second moments of the orientation distribution function obtained from a detailed analysis reveal that, upon rubbing, the PI substrates devel…
The adhesion strength of various photosensitive epoxies with copper or FR4 substrate was measured by the stud pull testing method. The adhesion strength was around 35–60 kg/cm2 for photosensitive epoxy/copper laminate and 60–105 kg/cm2 for photosensitive epoxy/FR-4 laminate. A high adhesion strength of metal/photosens…
Abstract
The crystal structures of inorganic compounds comprising cationic complexes containing oxygen atoms coordinated tetrahedrally to metal atoms, or oxocentred groups [OM4], are considered. The linking of the [OM4] tetrahedra in the structures has been analysed and cationic complexes of different structures have been iden…
Hyperbranched dendritic polyamine consisting of primary, secondary (a nonbranching junction), and tertiary (a branching junction) amino moieties was produced by Pd-catalyzed decarboxylative ring-opening polymerization of 5-methyleneperhydro-1,3-oxazin-2-one ( 2 ) at 25 °C with the aid of benzylamine as the initiator.…
Basic advances and prospects of further research in the field of the chemistry of nanoparticles are considered. The principal factors determining the unusual physicochemical properties of semiconductor nanoparticles are discussed. It is pointed out that the kinetics of chemical transformations on the surface and in th…
The mechanical properties and morphology of polypropylene/wood flour (PP/WF) composites with different impact modifiers and maleated polypropylene (MAPP) as a compatibilizer have been studied. Two different ethylene/propylene/diene terpolymers (EPDM) and one maleated styrene–ethylene/butylene–styrene triblock copolyme…
The adsorption of methyl radicals has been studied by X-ray photoelectron spectroscopy and temperature-programmed desorption (TPD) on a clean Ni(100) surface, Ni(100) with a chemisorbed oxygen overlayer, and Ni(100) with a NiO(111) oxide overlayer. Methyl radical dosing at surface temperatures of 120−170 K produces ca…