Materials Literature
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Temperature-dependent centimeter-wave reflection is studied in powdered samples of potassium nitrate (KNO3), potassium nitrite (KNO2), sodium nitrate (NaNO3), and sodium nitrite (NaNO2). Temperature-dependent reflection measurements at centimeter-wave frequencies were performed on an HP8510B Network analyzer based ref…
There is a need for an analytical assessment of the properties of 3D woven structures. In this paper a sophisticated method of predicting the proportions of fibre in three mutually perpendicular axes, X (warp), Y (weft) and Z (through-the-thickness), of 3D fully integrated complex woven structures is described. Unlike…
Abstract Inhibition of the corrosion of mild steel in H 2 SO 4 by amino acids was studied by measuring the Tafel polarization curves. Nineteen different naturally occuring amino acids were used as corrosion inhibitors. Two‐site adsorption model was proposed to explain the adsorption of some amino acids on the metal su…
In situ composites were prepared via melt blending of a liquid crystalline polymer (LCP) and polycarbonate using a twin screw extruder. The structure and morphology of these composites were analysed using both transmission electron microscopy (TEM) and scanning electron microscopy. The LCP phases were able to orientat…
Abstract Divalent tin has been intercalated into montmorillonite by reacting partially hydrolyzed solutions of SnCl 2 under aerobic conditions at pH = 2.8 with aqueous dispersions of the smectite mineral. The precursor tin solution contains mainly the cationic trimeric ion Sn 3 (OH) 4 2+ , which is shown to take part…
Data on the thermal conductivity ϰ ph of the cluster lattice of synthetic opals are analyzed. All opals are divided into two groups according to the temperature dependence of their ϰ ph . These are opals-1, whose thermal conductivity behaves like ϰ ph ( T ) of quasi-crystalline materials, and opals-2, with a ϰ ph ( T…
Mechanical properties of experimental nitrogen alloyed powder metallurgically produced duplex stainless steels were investigated. The microstructure of the studied powder metallurgically (PM) fabricated and hot isostatically pressed (hipped) duplex stainless steels was homogeneous and isotropic. The proportions of aus…
Sol-gel derived PZT thin films were spincoated on Corning 7059 glass substrates and fired to temperatures ranging from 500C to 600C for 30 min. The PZT compositions consisted of PZT x/y where x/y = 0/100, 20/80, 35/65, 53/47, 65/35, 80/20 and 100/0. Only single coated films were used since multiple coatings led to hig…
Severe fuel damage experiments simulating small-break loss-of-coolant accidents have been carried out in the CORA out-of-pile test facility at Forschungszentrum Karlsruhe. Rod bundles with electrically heated fuel rod simulators containing annular UO2 pellets, UO2 full pellet rods, and absorber rods of two kinds (Ag/I…
Eight kinds of knitted fabrics, made from wool, polyester, cotton, acrylic, porous acrylic, polypropylene, viscose and polyester/cotton blend, were studied by both objective laboratory measurements and subjective wearer trials. The transport properties of the fabrics: thermal resistance, water vapor permeability, air…
Magnetic properties of GdMn xFe1_xSi (x = 1, 0.9, 0.8, 0.7, 0.6, 0) compounds were investigated. Both GdMnSi and GdFeSi crystallize in the CeFeSi-type tetragonal structure and form a complete solid solution without any change in the crystal structure. Magnetic measurements were made in static magnetic fields up to 1 M…
Graft copolymerization of ethyl acrylate (EA) and methyl methacrylate (MMA) onto polychloroprene (PCP) were carried out in toluene using benzoyl peroxide (BPO) as an initiator. The polychloroprene-g-poly (ethyl acrylate) (PCP-g-P(EA)) and polychloroprene-g-poly (methyl methacrylate) (PCP-g-P(MMA)) were isolated from t…
The conformational properties of randomly branched polymers grafted at one end on a planar surface in the good solvent regime are investigated by using a Flory-type scaling theory and by solving a self-consistent-field model numerically. The average monomer height obtained from the self-consistent-field model is shown…
Simultaneous autostep technique, a novel methodology in thermal analysis, was employed for the investigation of multiple stage degradation of acrylic polymers in thermogravimetric (TG) and differential thermal analysis (DTA) methods. Heating of the sample was controlled automatically with respect to the rate of mass l…
Electropolymerization of the ligand-bridged, ruthenium polypyridyl assemblies [(vbpy)2ClRu(pz)RuCl(vbpy)2](PF6)2 and [(bpy)2(CN)Ru(CN)Ru(vbpy)2(NC)Ru(CN)(bpy)2)](PF6)2 results in formation of electroactive thin films on Sn-doped indium oxide (ITO), Pt, and glassy-carbon electrodes. The assemblies retain their mixed-va…
We consider the problem of end-grafted polymer molecules with a charged group attached to the free end both by an analytical and a numerical method. In the analytical approach the Gaussian model for the polymer chains is used. In this model volume interactions are ignored and analytical solutions for special type of b…
Emulsions of silicone oil-in water were formed using a Brinkmann Polytron homogenizer with Igepal CO-530 as an emulsifier. Silicone viscosities ranged from 10 to 33,000 mPa.s at 25°C. Rheological characteristics and particle size analyses of silicone oil-in-water emulsions were studied. At high volume fraction of the…
We study the quantitative behavior of a two-component polymer blend in the presence of an impenetrable interacting surface. A solution of the problem for ring chains is given, which can also describe the behavior of linear chains. While first-order perturbation theory is used for the interactions between the different…
The importance of van der Waals contact between Glu 35 and Trp 109 to the active-site structure and the catalytic properties of human lysozyme (HL) has been investigated by site-directed mutagenesis. The X-ray analysis of mutant HLs revealed that both the replacement of Glu 35 by Asp or Ala, and the replacement of Trp…
The new high-pressure synthesis route to obtain mixed compounds along the perovskite join with non-transition (metastable phase) and transition metal B cations is reported. The structure of the recovered phases is discussed within the Pm3m space group. TO-LO splittings and dielectric constant, inferred from the infrar…