Materials Literature
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Low-density polyethylene/plastisized starch blends varying in starch content were processed by conventional extrusion, injection-molding, and film-blowing techniques. Polyethylene-g-maleic anhydride (PE-g-MA) was used as a compatibilizer. X-ray diffraction was used to investigate starch destructurization during extrus…
The complexity of nonlinear models for simulating the dynamic behavior of arc furnaces is well known. For this reason, previous works are based on time domain solutions. In this paper, a new frequency domain approach for obtaining harmonics, interharmonics and unbalances of arc furnaces is proposed. The model assumes…
The loss of surface hydrophobicity of high temperature vulcanized (HTV) silicone rubber (SIR) due to immersion in saline solutions (0.005 to 100 mS/cm) has been studied as a function of immersion time (0 to 576 h) and temperature (0 to 98/spl deg/C). The subsequent recovery of the hydrophobicity in air is determined a…
A novel method of performing two-dimensional space-variant polarization operations is presented. The method is based on determining the local direction and period of subwavelength metal-stripe gratings by use of vectorial optics to obtain any desired continuous polarization change. We demonstrate our approach with spe…
Bimetallic thiocyanate complexes crystal materials belonging to ABTC structure type: ZnCd(SCN)4 and AHg(SCN)4 (A = Zn, Cd, Mn ) which are potentially useful in second harmonic generation (SHG) have been prepared. Their structural, optical and physicochemical properties are characterized by infrared spectroscopy, X-ray…
The theory of contact angles has been developed using the concept of the Young contact angle, an equilibrium quantity related to perfectly smooth and homogeneous surfaces; on real surfaces it is commonly accepted that one can obtain metastableequilibrium states, in which the shape of the meniscus along the triple line…
Two C-glucosyl porphyrins are prepared using Ramberg–Backlund and Lindsey methods for the key conversions, and thiosugars are shown to react with perfluorophenylporphyrins.
Recent studies with PEG liposomes in patients have consistently shown that liposomes can induce side effects (flushing, tightness of the chest). Furthermore, the blood clearance of PEG liposomes was shown to be dose-dependent: at lipid doses lower than 1 micromol/kg, PEG liposomes do not show the long-circulation prop…
Tetrafunctional lactic acid oligomers with low molecular weight ethylene glycol cores were synthesized and characterized to assess their applicability to orthopaedics. Utilizing a visible light photoinitiating system, these oligomers polymerize within minutes to form highly crosslinked networks and, thus, have potenti…
The thermal behaviour and melting characteristics of diclofenac sodium were investigated using various instrumental techniques--differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier-transform infrared (FT-IR) spectroscopy and thin layer chromatography (TLC). DSC analysis of diclofenac sodi…
The formation of manganese(II) complexes with polyaminopolycarboxylic ligands based upon 1,4,7,10-tetraazacyclododecane (cyclen) has been studied in aqueous solution by means of potentiometric and microcalorimetric techniques affording log K, ΔH° and TΔS° values for the complexation reactions. The ML complexes present…
Interaction of the segments of interconnect trees during electromigration experiments has been studied using several simple tree structures. It is demonstrated that the reliability of a segment can not be predicted without knowledge of the conditions for stress migration and electromigration in connecting segments. Si…
By measuring the currents associated with the streamer discharge along silicone rubber surfaces, parameters of streamer propagation such as the minimum field of streamer crossing, the field of stable streamer propagation, the mean velocity and the streamer charge distribution have been analyzed and compared to the str…
The two novel thioantimonate(III) compounds [Co(C6H18N4)]2Sb4S81 and [Co(C6H18N4)]2Sb2S52 were synthesised under solvothermal conditions by reacting elemental Co, Sb and S in a 95% solution of tris(2-aminoethyl)amine (tren). Compound 1 crystallises in the monoclinic space group P21/c, a = 17.936(4) Å, b = 13.442(3) Å,…
A set of nine monomers derived from diaryl-cyanovinylene, -carboxyvinylene and -cyanobutadiene were synthesized as were the corresponding polymers resulting from the chemical polymerization of the monomers in the presence of an almost quantitative amount of FeCl3 in chloroform. The aim of this work was to investigate…
Oxide layers thermally formed on copper have been studied using double sweep cyclic voltammetry in strongly alkaline electrolytes. It was found that the addition of 1 M LiOH in an electrolyte (6 M KOH) allowed perfect resolution of cathodic waves due to the reduction of and CuO. Assignment of the two reduction waves h…
Three-dimensionally ordered macroporous active carbon has been fabricated by carbonizing an aqueous solution of sucrose in the presence of sulfuric acid; nitrogen adsorption measurements show the presence of a microporous wall structure framework leading to a high BET surface area of 408 m2 g−1.
The deep drawability of commercial purity aluminium sheets is improved by introducing a (in fcc materials rather unusual) {111} fibre texture in the sheet surface layers. An additional step of warm rolling after the conventional hot and cold rolling leads to the formation of a pronounced shear texture in the sheet sur…
Adherent electroactive films of poly( o -phenylenediamine) (PPD) were obtained by electropolymerization of o -phenylenediamine ( o -PD) on 304 stainless steel under potentiostatic conditions. The in situ Fourier transform infrared reflectance spectroscopy study suggests a phenazine ring ladder-structure polymer. Open…
Electron paramagnetic resonance (EPR) has been used to characterize a hole trap and several electron traps in single crystals of potassium dihydrogen phosphate (KH2PO4 or KDP). The paramagnetic charge states of these centers are produced by ionizing radiation (e.g., x rays or a 266 nm beam from a pulsed Nd:YAG laser)…