Materials Literature
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In this article an experimental method of characterization and modeling of ferroelectric materials is presented. The reversible and irreversible contributions of polarization are separated. The measurements of these effects are performed simultaneously giving a perfect separation. Investigations on switching behavior…
The potential of freeze-dried fibrin glue (FG) in combination with growth factor (GF) and gelatin (GEL) is evaluated for use as a matrix for endothelialization of artificial vascular grafts made of polytetrafluoroethylene (PTFE, Teflon) and polyethyleneterephthalate (Dacron). Improved adhesion and proliferation of hum…
Abstract The use of sulfur compounds and particularly sulfamates for flame‐retarding cellulose and other polymers is reviewed. Recent results on flame‐retarding polyamides in this laboratory are presented. The system developed requires the use of 1.5–2.5 wt% of ammonium sulfamate (AS) or diammonium imidobisulfonate (D…
Abstract The effects of the incorporation of different kinds of fibers on the physical and mechanical properties of thermoplastics elastomers based on blends of isotactic polypropylene (iPP) and ethylene‐propylene diene rubber (EPDM) are described. For this purpose, three different compositions of PP‐EPDM blends reinf…
Accurate calculation of the value of the core hot-spot temperature at the design stage is becoming very critical in order to ensure that hydrogen generation that can be caused by oil-film degradation at core hot-spot temperatures as low as 110-120/spl deg/C is limited. Presented are two calculation methods developed f…
Abstract Physical mechanisms for foam formation in the presence of colloidal particles are poorly understood. This study is aimed at enhancing the basic understanding of the mechanisms that produce foaming in a three‐phase system, containing solid, liquid, and gas, and identifying key parameters that aggravate foaming…
Abstract In order to provide a continuous preparation method of CdSe nanocrystals, a microreactor was utilized. Particle size of a CdSe was controlled easily by a second order controlling of reaction time. The fluorescence color was also possible to be controlled by the reaction time.
Abstract This paper reports on our recent attempts in the characterization of n‐doping of polythiophene (PTh) and p‐doping of polypyrrole (PPy) for their use as the anode and cathode, respectively, for rechargeable batteries. N‐doping of PTh with large (TEA) cations was studied by combined application of cyclic voltam…
The piezoelectric and electromechanical properties of rhombohedral Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 (PZNT, PT<9%) single crystals in the shear mode are reported. PZNT8 single crystals poled along the <111> direction with electrodes on the (110) faces (X cut) were found to have the electromechanical coupling factor reach…
Different configurations of a single nitrogen atom adsorbed at different sites on the sidewall of single-walled carbon nanotubes (SWNT's) are studied through first-principles calculations. It is found that the outer surface of the tube wall is reactive to the nitrogen atom, and a nitrogen atom can be chemically adsorb…
Gas phase hydrogenation of acetonitrile has been studied with various Pd-based catalysts using several supports, ZrO2, CeO2, MgO, SiO2, Al2O3, ZnO, Ga2O3 and In2O3. The catalysts may be divided into two groups, one of which includes ZnO, Ga2O3, and In2O3-supported catalysts and another group includes the other catalys…
The compatibilizing effect of nano sized calcium carbonate filler on immiscible blends of styrene-co-acrylonitrile/ethylene propylene diene (SAN/EPDM) was examined. The surface energy of the calcium carbonate was modified by stearic acid. The compatibility of SAN/EPDM blends was studied by following the glass transiti…
Abstract In situ polymer/polymer short fiber composites were generated by a two‐step process. In the first step, a polyamide (PA) dispersed phase is blended with a polypropylene (PP) matrix in a twin‐screw extruder at a temperature at which both polymers are in molten state. The extrudate was then stretched at the die…
Abstract The effect of physical compatibilization on the deformation and coalescence of droplets in immiscible polymer blends is discussed. Evidence is provided for the existence of concentration gradients in block copolymers along the interface during deformation. This causes complex changes in droplet shapes during…
Inherently conducting polymers (ICPs) have been an area of intense interest over the past 30 years, culminating with the award of the 2000 Nobel Prize in Chemistry to MacDiarmid, Heeger and Shirakawa. More recently the unique properties of these materials (e.g., higher conductivity, more rapid discrete electrochemical…
Growth of single crystals of some protein aminoacids and synthesis and growth of single crystals of their related compounds are reported. The temperature dependence of the integrated piezoelectric response of the single crystals grown was studied in the temperature range 120–320 K. The specific features in the tempera…
The measurement and analysis of leakage current (LC) for condition-based monitoring of, and as a means of predicting flashover of polluted insulators has attracted a lot of research. Results presented in the technical literature show that surface arcing of contaminated insulators causes significant variations in the m…
Calcium sulphate subhydrates (CaSO4 · x H2O, 0 < x ≤ 0.8) have a honeycomb-shaped channel structure. The symmetry is either trigonal or a slight deviation thereof. Due to insufficient diffraction data and the high pseudosymmetry of the structure, it is not possible at this point to determine with certainty the specifi…
Single-walled (SWNTs) and multiple-walled (MWNTs) carbon nanotubes were solubilized via the esterification of nanotube-bound carboxylic acids by oligomeric polyethylene glycol compounds. The water-soluble samples were used as starting materials in reactions with bovine serum albumin (BSA) protein in ambient aqueous so…
Particulate-filled composites were prepared from CaCO 3 and polymer matrices of various acid-base characters. Interfacial interaction of the components was characterized by the reversible work of adhesion, which was calculated either from dipole-dipole or acid-base interactions. The thickness of the spontaneously form…