Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The precipitation of CaCO3 in the absence or the presence of the G4.5 PAMAM dendrimer was carried out by a “carbonate diffusion method”. Formation of crystalline CaCO3 at different feed ratios of the G4.5 dendrimer to calcium ions was studied with the concentration of calcium ions kept at 0.1 M. Although calc…
We have studied corrosion of a stainless steel in nitric acid solution containing neptunium. Using type 304L stainless steel, corrosion tests in boiling neptunium nitrate solution were conducted under immersion and heat-transfer condition. By the weight loss measurement of stainless steel and the quantitative analysis…
The chlorination of uranium metal or uranium oxides in chloride melts offers an acceptable process for the head-end of pyrochemical reprocessing of spent nuclear fuels. The reactions of uranium metal and ceramic uranium dioxide with chlorine and with hydrogen chloride were studied in the alkali metal chloride melts, N…
Nitrided phosphate glasses are characterized by tetrahedral units P(O,N) 4 in which nitrogen atoms have substituted for both bridging and non-bridging double bonded oxygen atoms. 31 P magic angle spinning (MAS) nuclear magnetic resonance (NMR) shows that PO 4 , PO 3 N and PO 2 N 2 tetrahedra may coexist within the gla…
Abstract In an attempt to elucidate the role of filler morphology in elastomer reinforcement, we use x-ray, light and neutron scattering to determine the structure of precipitated silica powders. We find the signatures of at least three levels of structure: primary particles, aggregates and agglomerates. By observing…
This paper deals with the synthesis of vanadyl phthalocyanines substituted with eight alkoxy chains in the peripheral (2, 3, 9, 10, 16, 17, 23, 24) positions. The alkoxy chain length was varied, and octa-octyloxy (C8H17O), octa-dodecyloxy (C12H25O) and octa-hexadecyloxy (C16H33O) substituted vanadyl phthalocyanine com…
Abstract A thermodynamic model is developed for the correlation and prediction of crystal solubility and purity when lattice substitution by isomorphic or near‐isomorphic impurities is the dominant mechanism that leads to impure crystals. The model is based on earlier observation that the purity of amino acid crystals…
Bromoacetylated α-hydroxy-ω methoxy-poly (ethyleneglycol) (M n = 2000 g mol −1 ) was allowed to react with a poly(∊ caprolactone) (M n = 53,700, M w /M n =(1.50) that was first activatedby removing some of the proton atoms borne by the carbon atoms locatedin -position of carbonyl groups using lithium N-N-diisopropylam…
The thermal stability of different lead oxide films prepared by reactive dc magnetron sputtering from a Pb target has been investigated. The temperature dependence of composition as well as structural and optical properties have been studied by Rutherford backscattering spectroscopy (RBS), X-ray diffraction (XRD) and…
Abstract Hollow microspheres composed of organic-inorganic hybrid wall (polyorganosiloxane) have been synthesized as a new material in a W/O emulsion system from organosilanes. The average diameter of spheres for a typical run is 1.8 μm (standard deviation = 0.84) with a large spherical cavity in them and thermally st…
A breakdown from the dislocation-pile-up-based Hall-Petch model is typically observed in metallic multilayers when the layer thickness (one half of the bilayer period) is of the order of a few tens of nanometres. The multilayer strength, however, continues to increase with decreasing layer thickness to a few nanometre…
Abstract The reactive compatibilization of ethylene‐propylene‐diene (EPDM)‐based dissimilar elastomer blends has been investigated in terms of mechanical properties and swelling degree. The use of mercapto‐functionalized copolymers resulted in an improvement of mechanical properties of natural rubber‐EPDM blends. The…
A sol leading to a eutectic Al 2 O 3 –Y 3 Al 5 O 12 composition was spun into fibers. These fibers were dried and pyrolyzed between 200° and 850°C in a nitrogen or water‐vapor atmosphere. Pyrolysis in nitrogen resulted in dense, amorphous fibers with considerable residual carbon content. In water vapor, fibers also re…
In Japan, disposable gloves made from nitrile-butadiene rubber (NBR) are frequently used in contact with foods. In a previous paper, we investigated substances migrating from various gloves made of polyvinyl chloride, polyethylene, natural rubber and NBR. Zinc di-n-butyldithiocarbamate (ZDBC), diethyldithiocarbamate (…
Thermal diffusion of protons, deuterons and tritons forming OH − , OD − and OT − radicals respectively was monitored by infrared absorption measurements in MgO, Al 2 O 3 , LiNbO 3 and TiO 2 single crystals. The electric charge and/or ionic radius is shown to be more important than mass in affecting the diffusion behav…
The structures and spectroscopic properties of Se n S 8 n ring molecules have been studied by the use of ab initio molecular orbital techniques and density functional techniques involving Stuttgart relativistic large core effective core potential approximation with double zeta basis sets for valence orbitals augmente…
The titanium hydrogenation process in the H2+ implanted Ti225 titanium alloy has been studied in this work. The Ti/H phase transformation from hydrogen solid solution (hcp) to gamma phase titanium hydride (TiH(γ)) with a primitive tetragonal structure and then to a titanium dihydride (TiH2(x)) with a body centred tetr…
Summary In recent years, a number of new high-pressure/high-temperature (HP/HT) reservoirs have been developed in the North Sea [for example, the Eastern Trough Area Project (ETAP) and Shearwater fields] that have several important scale-control issues. In addition to their ability to prevent scale formation, these in…
Membranes with designed surface and filtration properties were prepared by the adsorption of polyelectrolyte multilayer systems on membrane surfaces using the layer-by-layer electrostatic self assembly (ESA) technique. Microfiltration membranes with a first polyelectrolyte layer grafted onto the surface showed excelle…
Three homologous series of symmetric esters derived from 2-alkylthio-5-(p -hydroxy)phenyl-1,3,4-oxadiazole (series 3, 4 and 5) were synthesized and their liquid crystalline properties investigated by optical microscopy and differential scanning calorimetry. Depending on the chain length, nematic and smectic C phases w…