Materials Literature
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The photoexcited triplet states of the nonplanar porphyrins, free base and zinc 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrins (OETPPs), were examined by laser excitation-time resolved EPR spectroscopy. Measurements were carried out at low temperatures in glassy matrices, and over a wide temperature ra…
Heteroepitaxial growth of SrTiO 3 (STO) films with and without buffer layers on Si(100) and (111) substrates has been conducted by a focused electron beam evaporation method. It has been found that thin metallic layers such as Ti and Sr are effective for improving the quality of overgrown STO films, which is probably…
<div class="htmlview paragraph">The modeling of transient phenomena occurring inside an automotive 3-way catalytic converter poses a significant challenge to the emissions control engineer. Since the significant progress that has been observed with steady-state models cannot be directly exploited in this directi…
In this paper, we describe the effects of electrode materials on the leakage current of Ta 2 O 5 films, and show optimum electrode materials for high- and low-temperature processes. The leakage current depends on the electrode material and varies with the annealing temperature. The leakage current is mainly determined…
Effects of lithium bromide (LiBr) concentration, pH, temperature, exposure time, and the action of some inhibitors on corrosion of several carbon (C) steels, stainless steels (SS), and a titanium (Ti) alloy were studied. Corrosion rates were determined by the polarization resistance method and compared to rates determ…
Abstract Superior impact properties were obtained when maleic anhydride grafted styrene ethylene/butylene styrene block copolymer (SEBS‐g‐MAH) was used as a compatibilizer in blends of polyamide 6 (PA 6) and isotactic polypropylene (PP), where polyamide was the majority phase and polypropylene the minority phase. The…
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Three types of artificial skin containing keratinocytic components were prepared and tested for comparison. Keratinocytes were cultured on the artificial skin dermis (collagen sponge) by the air-liquid interface culture method. In order to create continuous keratinocytic layers on the artificial skin dermis, pores of…
The effective thickness of ferroelastic twin-walls (W-walls) in Pb3(PO4)2 at room temperature (≈ 0.7 T c ) was determined by X-ray diffraction. The diffraction profiles were analysed using a wall profile e=eotanh x/w where W is the effective wall thickness including the effects of wall bending and surface relaxations.…
Semiconducting BaTiO 3 ceramics have been prepared by adding BN as a sintering aid. Density as high as 93% of theoretical and grain size as large as 16 μm are obtained after sintering at 1160°C. Most significant is that the semiconducting BaTiO 3 is obtained at sintering temperatures as low as 1100°C. The low‐temperat…
The review describes the principles of a holographic storage process based on the liquid crystalline state of organic polymeric materials. Such materials are capable of forming anisotropic glasses, which can be obtained as thin films. By suitable means one is able to align the optical axis of the uniaxial system withi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Chain Entanglement on the Failure Modes in Block Copolymer Toughened InterfacesC. Creton, H. R. Brown, and V. R. DelineCite this: Macromolecules 1994, 27, 7, 1774–1780Publication Date (Print):March 1, 1994Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerroelectric Behavior in Metal-Containing Liquid Crystals: A Structure-Activity StudyM. J. Baena, J. Barbera, P. Espinet, A. Ezcurra, M. B. Ros, and J. L. SerranoCite this: J. Am. Chem. Soc. 1994, 116, 5, 1899–1906Publication Date (Print):March 1, 1994Publication History Pu…
Fabrication of a photooptical switching device based on the photo-induced refractive index change of polymer film doped with photochromic compounds is described. 1,2-bis(2-methylbenzo[b]thiophen-3-yl) perfluorocyclopentene (BFCP) and 1,2-dicyano-1,2-bis(2,4,5-trimethyl-3-thienyl)ethene (CMTE) were used as the photochr…
By simply placing a shadow mask between the target material and substrate, the particle (or droplet) problem peculiar to the excimer laser deposition technique was completely eliminated. It is tentatively called the “ eclipse method ”, in which the deposition proceeds through only diffusion. Mirrorlike YBa 2 Cu 3 O y…
Persistent spectral hole burning is observed in Sm(2+)-doped glasses at room temperature. The holes are burned in the (7)F(0) ? (5)D(0), (5)D(1) lines of the Sm(2+) ions in three kinds of fluoride glass. The dependence of the burning efficiency on the sample and on the burning intensity is measured. The intensity depe…
A new nonlinear optical polymer of phenoxy resin containing 2-cyano-5-(4-methoxyphenyl)-2,4-pentadienoate as a pendant group is synthesized. A high concentration (84%) of chromophores with a relatively high value of hyperpolarizability ( 50×10 -30 esu) is obtained. The corona-poled polymer film shows hypochromic shift…
Vanadium-base alloys of the V-Cr-Ti-Si system are attractive candidates for use as structural materials in fusion reactors. The vanadium-base alloys exhibit relatively low long-term activation, irradiation induced afterheat and neutron-induced helium transmutation rates. Because of favorable physical properties these…
Abstract The surface orientation and detailed defect microstructure of polycrystalline diamond can be observed in a scanning electron microscope through local changes in the surface conductivity. The electron contrast in uncoated samples is straightforward to distinguish when the rms surface roughness is less than abo…
This paper deals with a method for determining the complex permeability in analysis of hysteresis motors. The method assumes that the magnetic intensity distribution is sinusoidal in the direction of rotation. Analysis of the asynchronous speed of a hysteresis motor is then performed for cylindrical coordinates, using…