Materials Literature
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High purity alumina ceramics have been used for more than 25 years in biomedical applications due to their excellent wear behaviour and high strength. Nevertheless great effort have been undertaken to develop a material with increased strength combined with excellent wear properties. One candidate material family is Z…
Polyurethane elastomer (AU) and silicone rubber (VMQ) form immiscible blends with a low compatibility. In order to improve the compatibility and physical properties of the blends, VMQ was first grafted with vinyl triacetoxy silane (VTAS) by using dicumyle peroxide (DCP) as a grafting initiator; subsequently, it was bl…
Abstract An experimental procedure to determine metallic thin film thicknesses by using electron probe microanalysis (EPMA) is presented. Several monoelemental films of Al, Ti, Cr, Cu, Nb, Mo and Au with different thicknesses, deposited on an Si substrate, were characterized by Rutherford backscattering spectrometry f…
Sublimation and deposition of the metal-organic complex palladium (II) acetylacetonate [ Pd(acac)2] was investigated through thermogravimetry and XRD. The temperature range for sublimation, avoiding thermal decomposition, was determined to be 100−160 °C and required to take place in the presence of an inert gas such a…
Dielectric measurements on a sample consisting of banana-shaped molecules were carried out in a frequency range between 0.1 Hz and 10 MHz. The sample exhibited B2 and B4 phases. As usual, two ranges of relaxation were detected in the B2 phase, the fast reorientation about the long axes of the molecules and a slow coll…
We report the results of optical in situ monitoring of the epitaxial growth of perovskite oxide thin films by an oblique-incidence reflectance-difference (OIRD) technique. Optical oscillation that corresponds to the growth cycle of an interrupted growth mode (monolayer oscillation) is observed. The monolayer oscillati…
Polycondensates with too short chains can be chain-extended with repair molecules. In this report, the molecular weight and, thereby, the melt viscosity of polyamides is enhanced in the extruder by two chemically very different types of repair molecules. Firstly, the chains were extended linearly with a bisoxaline whi…
FT-IR, UV-spectroscopy and X-ray diffraction of thiourea-Poly (vinyl alcohol) (PVA) complexes have been investigated. It was observed that thiourea affected the structure of PVA. X-ray study revealed that as the thiourea salt increases the crystallinity of PVA increases. The dielectric properties of thiourea-PVA compl…
A novel nonlinear optical complex crystal with an organic ligand coordinated through an O atom: tetrathiocyanatocadmiummercury-dimethyl sulfoxide, [CdHg(SCN)4(H6C2OS)2], (CMTD) is reported for the first time. Single crystals have been grown by temperature-lowering method, the crystals tructure has been determined, and…
Polarization properties of elliptical-core liquid crystal optical fibres have been investigated and the experimental results on the liquid crystal fibres in the polarimetric configuration subjected to the influence of hydrostatic pressure and temperature are presented.
The induced uniaxial anisotropy field H/sub k/ in very thin films sandwiched by Ta or Cu layers was investigated. The value of H/sub k/ of the Ta/Cu/Ni/sub 79/Fe/sub 21//Cu/Ta film decreases as film thickness decreases below 20 nm, even after an annealing procedure in a magnetic field. This H/sub k/ reduction is simil…
The role played by inorganic chemical additives in fire retardancy and flame inhibition is considered. Particular attention is given to the molecular level aspects of commercially important systems containing compounds of antimony, halogens, and phosphorus. The flame inhibiting function of metal containing additives i…
Solid-state extrusion technique was employed for the improvement of flexural strengths of poly(L-lactic acid) (PLLA) that is currently used as materials for various internal fixation devices. PLLA was vacuum compression molded to have two different crystallinities, from which cylindrical billets of various diameters w…
Changes in rheological properties, morphology, and oil resistance in NR–NBR blends by viscosity ratio have been investigated. In this study, the viscosity ratio was modified by mechanical mastication and addition of liquid natural rubber (LNR) and epoxidised liquid natural rubber (ELNR). The results reveal that as vis…
The effects of Zr and Co substitutions for Fe on the magnetic properties of nanocrystalline near-stoichiometric (Nd/sub 0.75/Pr/sub 0.25/)/sub 12/(Fe/sub 1-x/Co/sub x/)/sub 82-z/Zr/sub z/B/sub 6/ (x=0,0.1,0.2 and z=0-4) alloy ribbons are reported. The nanoscale structures were derived by devitrification annealing of a…
We have studied the processes of photocoloration and discoloration in Mn:YAlO3 and relevant crystals. We show the following: (1) The coloration rate in Mn:YAlO3 does not depend on Mn concentration. (2) The effective recombination time of free electrons with Mn5+ ions and deep traps is of the order of ≈0.5 ms. (3) The…
The molecular associations of N-( n-hexyl)hexanamide (PA-12MC) and N-( n-butyl)benzenesulfonamide (BBSA), taken as model compounds for polydodecamide (PA-12) and benzenesulfonamide plasticizers, respectively, were examined by Fourier transform infrared spectroscopy. In solution, the amide is distributed between a self…
Submersed macrophytes are real w ater plants because they are rooted in sediment and can complet e their grow t h and reproduction inside t he overlying w ater.P roviding a linkage bet ween w ater and sediment, t hey have t he closest int eraction w it h w ater environment.T his interact ion is very complicat e partly…
Abstract The radiation polymerization of hydrophilic hydroxyethyl methacrylate monomer solution at temperatures below 0 ° C leads to the formation of a porous structure in the polymers. The melting peak of the eutectic water–monomer composition at the eutectic point (above − 24 ° C ) could be distingushed and a glass…
Two novel series of bent-shaped achiral azo compounds with the following molecular structures have been synthesised and characterised.