Materials Literature
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Phenanthro[b]phenazine, a new heterocyclic ring structure of both biological and physical interests, has been prepared by coupling 1, 2-phenylenediamine with triphenylene-2, 3-quinone derivative. The first derivative of this novel core, 2,3,6,7-tetrapentyloxyphenanthro[b]phenazine, shows a monotropic columnar phase.
We investigated the solid-solution (1 − x)Pb(Zn1/3Nb2/3)O3–xPbTiO3 relaxors by means of Raman spectroscopy. A detailed temperature-dependent study in the range 70–580 K was carried out on (1 − x)PZN–xPT relaxors with compositions x = 0.02 and 0.05 using Raman scattering under different optical and electric field varia…
The relationship between the rheological properties and composition of eight thermoplastic polyurethane elastomers (TPUEs) was evaluated using a stress-controlled rheometer. The composition of the TPUEs was changed by varying the OH/NCO ratio, the chain extender and the molecular weight of the macroglycol used in the…
Dense α-Si3N4 ceramics were fabricated by the tape casting technique using La2O3 as a sintering additive to effectively suppress the α-β transformation. Addition of a small amount of elongated β-Si3N4 seed particles significantly improved the toughness of sintered bodies from about 2 to 6MPa·m1/2. It was found that bo…
The oxidation behavior of stoichiometric SiC fiber (Hi-Nicalon-S) was investigated and compared with those of Nicalon and Hi-Nicalon fibers. Hi-Nicalon-S fiber was oxidized in Ar-O2 gas mixtures with 25-100% O2 at 1273-1773K. The oxidation rates were measured with thermobalance experiments. The thickening in SiO2 film…
Iron losses in electrical machines are difficult to predict. Discrepancies between tested and calculated no-load core losses are sometimes large. In induction motors, a large portion of the stator core is subjected to flux that rotates in the plane of the laminations. Losses due to rotating flux differ from those obse…
In this paper the measurement results of a series of standstill frequency response tests, performed at different magnetization levels, are discussed. For each data set an individual model is estimated, which allows the variation of the different parameters to be seen as a function of the saturation. Further, an estima…
Blends of cellulose acetate butyrate (CAB) and polyestercarbonate (PEC) in the composition range of 0–100 wt % in each component were prepared by thermal compounding. The mechanical, thermal, and rheological properties of the polymer blends were studied. Analysis of the DSC curve showed that CAB was an amorphous polym…
Zinc salts of ethyl, isopropyl, and butyl xanthates were prepared in the laboratory. They were purified by reprecipitation and were characterized by IR, NMR, and thermogravimetric analysis techniques. The melting points were also determined. The rubber compounds with different xanthate accelerators were cured at tempe…
This work reports on the redox behaviour of different ceria–praseodymia mixed oxides with two different chemical compositions (Ce/Pr molar ratios of 4 : 1 and 9 :1). The samples consist of bulk oxides and ceria-supported samples with varying mixed oxide loading (equivalent to 7 or 12 mixed oxide layers). As revealed b…
Since the critical exponent of the elastic modulus is related to the spatial dimension and the critical exponent of the correlation length, depending on the characteristics of elasticity, we experimentally evaluated both the elastic modulus of a sol-gel transition system and also the correlation length. We could deter…
[reaction: see text] N-alkyl-substituted meso-tetrapyrrolylporphyrin (TPyrP) and its derivatives were synthesized for the first time via an acid-catalyzed condensation between N-alkyl-2,4-diformylpyrrole and unsubstituted pyrrole and a subsequent deformylation reaction. X-ray structural analysis of formyl-substituted…
Abstract Now we can use several temperature control modes, for example, isothermal run including stepwise heating and cooling, constant rate heating (or cooling), temperature control for sample thermal history, sample-controlled thermal analysis (SCTA or controlled-rate thermal analysis, CRTA), temperature jump, rate…
Aluminum titanate (Al2TiO5) based ceramics are used as excellent thermal shock resistant, corrosive and insulating materials because of their low thermal conductivity, low thermal expansion and low Young's modulus. However, these materials have a low mechanical strength due to the presence of microcracks developed by…
The reactions of polylactic acid (PLA) oligomers and isocyanates (4,4′-diphenylmethane diisocyanate and toluene diisocyanate) are reported. The effects of the reaction conditions, that is, the reaction time, reaction temperature, molar ratios, isocyanates, and catalyst, on the number-average molecular weight (Mn ) are…
IR spectra of single phase sulfuric acid hydrates have been measured and the conversion between sulfuric acid monohydrate (H3O+HSO4−, SAM) and sulfuric acid tetrahydrate ([H5O2+]2SO42−, SAT) as a function of temperature and water partial pressure pH2O has been followed using the principal absorption bands of the four…
We investigated the composition, properties, and utility of a novel hybrid material of poly(N-isopropylacrylamide)-grafted silica. The modified silica was prepared in two steps: (1) grafting silane layers of active precursors, such as initiator, transfer agent or comonomer onto the silica surface by solution depositio…
BWR fuel cladding corrosion and hydriding performance may limit the fuel residence time. Historically, out-of-pile high-temperature steam tests have been used to predict the BWR corrosion performance of Zircaloy materials. However, results indicate that no correlation exists in many cases between in-pile and out-of-pi…
40. Noncovalent Multiporphyrin Assemblies (J-C Chambron. 41.Applications of Porphyrins and Metalloporphyrins to Materials Chemistry. 42. Metalloporphyrins as Catalysts for Precision Macromolecular Synthesis. 43. Porphyrins as Photosensitizers in Photodynamic Therapy. 44. Porphyrin-Based Electrochemical Sensors. 45. Ca…
The phenomenon of concentration quenching of the luminescence from donor ions in crystals of La 1− x Ce x F 3 solid solutions was studied. A cooperative nonradiative energy transfer from a single excited neodymium ion to a cooperative acceptor representing a couple of cerium ions, as well as from a single erbium ion t…