Materials Literature
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Mixed Ni–Mo–W oxides have been prepared by decomposition at 873 K of Anderson-type [NiMo 6-x W x O 24 H 6 ](NH 4 ) 4 5H 2 O (x=0, 2, 3, 4, 6) heteropolyoxometallates. Thermal analysis of the precursors, X-ray diffraction and Raman spectroscopy on the mixed oxides were performed. X-Ray powder patterns, collected at the…
Abstract The clay minerals, kaolin and montmorillonite, were compacted at different pressures up to 300 MPa. The textural characteristics (pore radius, surface area and porosity) of the clay minerals were measured after compaction and related to the particle size and the cation exchange capacity of these clays. Kaolin…
Abstract We measured the absolute rate constants for the hydrogen peroxide oxidation of two different octyl dimethyl amines in isopropanol/water mixtures at 23°C. The amines were 1‐octyl dimethyl amine ( 1 ) and 2‐ethylhexyl dimethyl amine ( 2 ); their structures were analogous to those most often encountered in comme…
One type of localized corrosion, known as “ant's nest corrosion”, in copper tubes is caused by decomposition products from chlorinated organic solvent and some types of lubricant oil. The decomposition products include carboxylic acids, acetates, formates and chlorides. Vinegar is mainly composed of acetic acid, which…
A pseudo-isopiestic method was employed to determine magnesium vapor pressures over liquid magnesium-yttrium alloys. From these, magnesium activities derived and converted to a common temperature of 1173 K using partial enthalpy values from literature. Experimental problems observed in the course of this investigation…
The effect of coordination number on 27Al NMR chemical shift was studied using ab initio molecular orbital calculation. In order to mimic Al of four-, five- and six-coordinations Al, the clusters of Al(OH)4-, Al(OH)52- and Al(OH)63- were employed for the calculation. The obtained shifts for Al(OH)4-, Al(OH)52- and Al(…
Clarifying material dynamic behavior is of the highest priority for safety evaluation of any structure under an impact problem. Grasping the strain rate dependence of material is necessary for the evaluation of structural integrity. To derive the strain rate dependence, the impact tensile tests should be done in a way…
The effect of the substitution of Te for Cu or Pb in nominal compositions on the formation of the high-Tc phase and on the thermal stability of the high-Tc phase under reannealing conditions at temperatures (500-800°C) lower than the formation temperatures such as 850°C in Bi-Pb-Sr-Ca-Cu-O (Bi-based system) supercondu…
The mechanical and dielectric properties of three kinds of poly(lactic acid-coglycolic acid) (PLG) with different molecular weights and polydispersities fractioned by ultrafiltration were investigated by dynamic mechanical thermal analysis (DMTA) and dielectric measurement. All samples showed typical behaviour of amor…
Parietal cells, which exist in the stomach and in Meckel's diverticulum of the ileum, secrete hydrochloric acid by means of H+,K(+)-ATPase (alpha- and beta-subunits) in the human body. Although parietal cells are generated from progenitor cells (stem cells), their lifespan (approximately 150-200 days) is distinctly lo…
The simultaneous two‐photon excitation energy transfer (SEET) was demonstrated for the first time using trichromophoric model compounds. Two identical donors (A–antenna) were covalently linked to an energy acceptor unit (T–target) with different energy levels preventing energy transfer of a single photon. At high inte…
Different types of molecular motion in confined nematic liquid crystals are briefly discussed with emphasis on their detectability by methods of nuclear magnetic resonance and relaxation. The review is illustrated by some recent experimental and theoretical results in this field.
Adsorption equilibria for solvent dehydration, namely, removal of trace water from solvents by inorganic adsorbents such as silica gels and activated alumina, were measured for various combinations of solvents and adsorbents to test the applicability of the capillary phase separation concept to these systems. The conc…
Specimens of 316L stainless steel are irradiated with 2.5 MeV He+ ions at temperatures of 400,500 and 550℃,respectively.For each implantation the dose and dose rate are separately 2.5×1021 ion/m2 and (3.2—3.8)×1016 ion/m2s-1.Bubble structures are investigated with cross sectional transmission electron microscopy(XTEM)…
Thermoplastic polyimides are a relatively new class of polymers that exhibit high-temperature stability and are useful in composite applications. One such material is Avim-id® K3B reinforced with Magnamite® IM7 graphite fibers. This composite system exhibits excellent strength and toughness, retains its strength and t…
The lattice invariant shear of the martensitic transformations in the Ti36.5Ni48.5Hf15 alloy was determined as a (001)B19′ compound twin by in-situ TEM technique. The morphological features of the (001)B19′ twin lamellas were revealed in detail. The shapes of the martensite variants were either the form of triangular,…
Differential thermal analysis-thermogravimetry (DTA-TG), and electron scanning microscopy (ESM) were used to study the decomposition of nickel formate dihydrate in air. The results showed that the decomposition pro- ceeds in two successive TG steps, the first is due to dehydration and the second is due to decompositio…
A new concept in macromolecular design is described, using sequence configuration as the tool to control the topology of a compact polymer chain fold.
High resolution transmission electron microscopy (HRTEM) has been applied to verify the validity of the O-lattice theory for geometrical approach to the grain boundary structure, then periodic structures predicted from the O-lattice theory have been compared with the HRTEM images. In addition, the correlation between…
A Fourier Transform Infrared (FTIR) analysis using Fresnel Attenuated Total Reflectance (ATR) was performed on silica-filled cis-1,4-polyisoprene. Silica filler's detrimental effects on zinc-activated cure systems has been well documented. The silane coupling agent bis-(y-triethoxysilylpropyl)-tetrasulfide (Si-69) and…