Materials Literature
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Abstract Ordered macroporous materials recently have attracted much attention. A method that utilizes the condensation of monodisperse water droplets on a polymer solution is proposed for the preparation of honeycomb microporous films. Our results show that it is a general method that can be used for patterning a wide…
This paper discusses the occurrence of siderite (FeCO3) on iron artifacts excavated from the waterlogged peat and gyttja sediment of the Danish Iron Age site Nydam Mose. Siderite was identified by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with ene…
Pitting behavior in the presence of cathodic polarization was investigated using aluminum single crystals with surface orientations of (100), (110), and (111). The effects of the surface orientations on pit density, pit current density, and pit morphology were studied. In addition, the development of crystallographic…
Nanocrystalline cerium oxide films with grain sizes as small as 6 nm are deposited by anodic deposition. Cyclic voltammetry studies of a series of complexing ligands indicate that formation constants below and a solution pH between 7 and 10 are needed for film formation. A mechanism is proposed for the deposition of p…
As part of an ongoing effort to study the anion binding properties of sapphyrins in various media, a number of previously reported water solubilized sapphyrins were studied in methanol and in buffered, neutral aqueous solutions and found to undergo self-aggregation under these solution phase conditions. The nature of…
Lattice constants and thermal expansion of Ce 1 − y Gd y O 2 − 0.5 y − δ ( y = 0 , 0.1 , 0.2 ) in the temperature range 25-1000°C were estimated with high-temperature X-ray diffraction (HTXRD) while oxygen partial pressure varied in 10 − 20 to 10 5 Pa. Under oxygen partial pressures higher than 1 Pa, linear thermal ex…
The deformation behavior, i.e. the microstructure development and the deformation mechanisms in nitrogen alloyed ferritic-austenitic duplex stainless steels were studied by means of microstructure investigations and texture measurements in both phases. By comparison with corresponding single phase bcc and fcc material…
A novel room-temperature ionic liquid (RTIL),1-allyl,3-methylimidazolium chloride (［AMIM］Cl),was synthesized,ch aracterized and used for dissolving cellulose.The solubility of cellulose in ［ AMIM］Cl was better than in 1-butyl,3-methylimidazolium (［BMIM］Cl).The pris tine cellulose and two cellulose samples regenerated…
This paper describes a procedure for fast suppression of the phenomenon of ferroresonance in coupling capacitor voltage transformers (CCVT) without major change in the CCVT design. It is shown that it is possible to adjust parameters of the secondary overvoltage protection and the filter circuit so that the ferroreson…
Surface enhanced Raman scattering (SERS) was used to observe interactions of dilute solutions with silver and copper surfaces in situ . Using silver as a model surface which supports strong SERS with a 514.5 nm laser, it was possible to observe at the near monolayer level, and the spectra were compared to those from o…
Hydrogen content trapped by vanadium precipitates was evaluated using vanadium bearing martensitic steels which show single TDA desorption peak. The peak consists of desorption from various sorts of trap site with different detrapping activation energy, even if it appears to be a single peak. Experimentally obtained s…
The effects of low-molecular-weight oxidized materials generated by corona treatment on the adhesion properties of polypropylene (PP) film were investigated by adhering four different materials to the modified PP: a polyamide printing ink, vapor-coated aluminum, a synthetic-rubber pressure-sensitive adhesive, and an a…
A complex-ion reaction route under solvothermal conditions was investigated for the preparation of micrometer-sized NiAs-type α-NiS with complex architectures, on the basis of the strategy that the framework structure of PEG-NiCl2 complex could provide orientation for the growth of 3D NiAs-type α-NiS crystals. The as-…
The traps in long duration phosphorescent SrAl 2 O 4 : Eu 2 + , Dy 3 + crystals have been evaluated using thermally stimulated luminescence and photostimulated luminescence (PSL) techniques. Afterglow phosphorescence is not observed at temperatures lower than 150 K. Traps with depths of E t , TSL = 0.0024 , 0.46, and…
Precipitation behaviour during heat treatment has been investigated on 9Cr1MoVNb steel. Coarse primary and fine secondary MX carbonitrides are observed in the as normalized condition. On the other hand, coarse primary MX is not detected after tempering at 1 038 K, and Nb-rich and V-rich fine secondary MX carbonitrides…
The effect of water vapor on the oxygen isotope exchange property was investigated for yttria-stabilized zirconia (YSZ) oxide ion conducting ceramics, which is widely used as an electrolyte material for solid oxide fuel cells (SOFCs). A slight amount of water vapor addition made a great enhancement of surface exchange…
This chapter is of an auxiliary nature and contains the modicum of the theory of finite reflection groups and Coxeter groups which we need for a systematic development of the theory of Coxeter matroids. A reflection group W is a finite subgroup of the orthogonal group of ℝ n generated by some reflections in hyperplane…
A simple model considering grain-size distribution is proposed based on the random anisotropy model. When the maximum grain size (Dm) is less than the exchange correlation length and induced anisotropies are sufficiently small, the effective magnetic anisotropy constant (〈K1〉) is given by using a distribution function…
Gallium arsenide nanoparticles have been prepared from GaCl3 and As(NMe2)3 in 4-ethylpyridine. UV spectra and emission luminescence show strong peaks for samples isolated after short reaction times. Time resolved photoluminescence (TRPL) was carried out using time-correlated single photon counting (TCSPC). The emissio…
Synthesis of hyperbranched poly(arylene ether phosphine oxide)s, HB PAEPOs, from bis(4-fluorophenyl)(4-hydroxyphenyl)phosphine oxide, 1a, in the presence of a series of core molecules with systematically altered reactivity of the aryl fluoride groups provides polymers with molecular weights, MWs, controlled by the con…