Materials Literature
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Magnetite nanocrystals, which are normally formed by magnetogeneric bacteria, have been prepared using a single source metallorganic precursor.
Ceramics and semiconducting materials with internal channels are crucial in a variety of diverse technologies such as “lab on a chip,” fuel cell applications, and cooling of microelectronics. In this paper, techniques for fabricating internal channels in brittle materials first are reviewed. Then, the mechanical machi…
Tin silicate species have shown good catalytic activity in various oxidation reactions. In an attempt to mimic surface tin species, several tin containing silsesquioxanes have been synthesized. Incompletely condensed silsesquioxanes (c-C5H9)7Si7O9(OH)3 and (c-C5H9)7Si7O9(OSiMe3)(OH)2 were reacted with common tin-precu…
A new compound Bi8O11(SO4), synthesised using ceramic techniques, has been studied using variable temperature X-ray powder diffraction, neutron powder diffraction and impedance spectroscopy. The material was found to undergo a phase change, on heating, from a complex structure stable at ambient temperatures to a high…
Two types of polyethylene, low density (LDPE) and high density (HDPE), as well as low density polyethylene containing an antioxidant were subjected to ?-irradiation in the presence of air and in water. The irradiated polymers were studied using IR spectrophotometric analysis. The radiation induced oxidative degradatio…
Fluor- hyroxy- and chlor-apatites of Ca, Ba, Sr, Cd and Pb have been synthesized and characterized by X ray diffraction, IR spectroscopy and chemical analysis. They are dissolved in a nitric solution using an isoperibol calorimeter. Combining the dissolution results with other results obtained in the same device or pi…
Effects of the preparation condition on magnetic properties were investigated in isotropic TbCu7-type Sm-Zr-Fe-Co-N materials made by the melt-spinning process. All the Sm-Zr-Fe-Co powders melt-spun with wheel speeds of 30-40 m/s showed a single-phase structure with crystalline TbCu7. The grain size of the powder decr…
Equal channel angular pressing (ECAP) is a viable forming procedure to extrude material by use of specially designed channel dies without a substantial change in geometry and to make an ultrafine grained material by imposing severe plastic deformation. Because the evolution of microstructures and the mechanical proper…
The tri-tungsten-vacant polyoxometalate, [alpha-AsW15(OH)4O52]13-, derived from the semi-vacant Wells-Dawson complex [alpha-AsW18(OH)4O58]7-, reacts with the late-transition metal cations, Cu(II) or Zn(II), to form sandwich-type species; the X-ray crystal structure of [alphabetabetaalpha]-(Cu(II)OH2)2(Cu(II))2(AsW15(O…
Significantly high benzyl acetate selectivity of 85% at a toluene conversion of ca. 93% was achieved for the first time in a single step by gas phase acetoxylation over highly active and selective Pd-Sb-TiO2 catalysts.
The nonuniformity of electrical characteristics of grain boundaries in ZnO varistors was systematically analyzed. The high nonuniformity exists in barrier voltages and nonlinearity coefficients in different grain boundaries. The barrier voltages have normal distributions, only a few grain boundaries were electrically…
New biodegradable polyurethanes containing azo-linked polymeric prodrugs of 5-aminosalicylic acid (5-ASA) in the main chain were prepared by reacting 1,6-Hexamethylenediisocyanate (HDI) with 3,30-azobis(6-hydroxy benzoic acid) (ABHB) and 5-[4-(hydroxyl phenyl) azo] salicylic acid (HPAS) as azo derivatives of 5-ASA. Th…
Fumed silica-filled PDMS, where quite a strong interaction exists between the filler and matrix via hydrogen bonding, was recycled by means of an extruder with high power ultrasound attachment. It was found that the reinforcing filler plays an important role in the devulcanization process. Compared to the precipitated…
Abstract The synthesis, structure, and properties of the dimetallic complexes [CuLCr(CN) 6 ] 6 ·[{CuL(H 2 O)} 6 Cr(CN) 6 ](ClO 4 ) 3 · 16H 2 O ( 1 ), [CuLCr(CN) 5 (NO)] 6 ·[{CuL(H 2 O)} 6 Cr(CN) 5 (NO)](ClO 4 ) 3 ·16H 2 O ( 2 ) and [CuL] 3 [W(CN) 8 ] 2 ·4H 2 O ( 3 ) {L = 3,7‐bis(2‐aminoethyl)‐1,3,5,7‐tetraazabicyclo[3…
Semi-processed, non-oriented electrical steels used in motor and transformer cores have their magnetic properties optimized by means of a heat treatment performed under a moistened nitrogen atmosphere containing small amounts of hydrogen. The oxidation of carbon on the steel surface by the oxidizing gases present in t…
The small addition of FeO 1.5 [ e.g. , 0.5 atom % (atom percent)] reduced sintering temperature (by ∼200°C), promoted the densification rate and grain growth, for the ceria-based powders. The measurements of lattice parameter indicated that the FeO 1.5 addition could also enhance the dissolution of Gd 2 O 3 in CeO 2 a…
In this work, we report a new and simple, but very useful, electron beam (EB) method for preventing the misting of inorganic materials. A law is suggested to predict the time required to achieve clear vision on misted transparent inorganic materials irradiated by an electron beam. Since the time to clear vision before…
Poly (tetrafluoroethylene) (PTFE) is a material that causes only a few rejections in a living body but has low tissue affinity. A soft tissue implant material that not only has high biocompatibility but also excellent bondability has been developed by photo-chemically incorporating OH functional groups on the PTFE sur…
A series of mandelic acid derivatives was oxidised by molecular oxygen using cobalt(II) chloride as the catalyst. Benzaldehyde and/or benzoic acid derivatives were obtained in high selectivities, depending on the aromatic ring substitution. Different oxidation mechanisms are operating, depending on the mandelic acid s…
Transient deformation of high burnup boiling water reactor (BWR) fuel rods was measured and failure limit was examined under simulated reactivity-initiated accident (RIA) conditions. Brittle cladding failure occurred at a small hoop strain of about 0.4% during an early phase of the pulse irradiation tests at the Nucle…