Materials Literature
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The pitting potential ( E pit ) of single-crystal beryllium in 0.01 M sodium chloride decreased with crystallographic orientation in the order ( 0001 ) > ( 101 ¯ 0 ) > ( 112 ¯ 0 ) . Orientations which were associated with the lowest E pit , ( 101 ¯ 0 ) and ( 112 ¯ 0 ) , were characterized by crystallographically orien…
The chlorine plasma/copper reaction that is the base of a new copper (Cu) dry etching process was studied. The reaction product is a rough and porous Cu chloride compound film. Influences of process parameters such as plasma exposure time, pressure, plasma power, and substrate temperature, on the copper chlorination p…
Conversion coatings for magnesium have traditionally been based on immersion treatment in the solution containing hexavalent chromium compounds. The excellent performance of these coatings as paint bases has been established in a broad range of application. However, the replaceable surface treatment has been strongly…
The interstratified layer nano-hybrids between n-alkylammonium and fluorine mica are prepared by ion-exchanging the interlayer Na+ ions in the synthetic fluorine mica, Na0.66Mg2.68(Si3.98Al0.02)O10.02F1.96, with n-alkylammonium cations, CH3(CH2)n − 1NH3+ (Cn; n = 6, 8, 10, 12, 14, 16, and 18). According to the X-ray d…
It is proposed that a non-polar filler can reduce interfacial energies between polar and non-polar polymers. Experiments have been carried out to test this hypothesis using carbon black as the filler in blends of natural rubber (NR) and a nitrile rubber (NBR) with an acrylonitrile content of 45%. Blends of NR–NBR (70/…
MagSaki software was developed for the magnetic analysis of dinuclear high-spin cobalt(II) complexes. This software performs magnetic analysis to determine magnetic parameters using several types of theoretical calculations, such as the following: (1) a mononuclear complex in an isotropic octahedral field, (2) a monon…
A tetraazaporphyrin (TAP) prepared by condensation of 1-ferrocenyl-1,2,2-tricyanoethylene in the presence of magnesium shows an intense, broad near-IR band in the 700–1300 nm region, which may be ascribed to charge-transfer transitions from the ferrocenyl moiety (substituents) to the TAP ligand.
Various correlations between the size of the trivalent cation (Al, Ga, Fe, and Cr) and the structural characteristics and decomposition behavior of Co-based hydrotalcites (Co/M3+ = 3) have been identified. In situ IR spectra (by the relative ratio of the amount of carbonate in low and high symmetry) and thermogravimet…
The combination of H3 + n[PMo12 - nVnO 40].aq (HPA-n, n = 3) and dioxygen proides a clean and regioselective reagent for the homolytic cleavage of various representative alpha-hydroxy ketones (primaryto tertiary) and turns out to be as efficient for the catalytic ring opening of chiral natural products.
Highly dispersed 3–6 nm platinum nanoparticles have been deposited by low temperature chemical vapor deposition of [PtMe2(η4-C8H12)] in a fluidized bed reactor on carbon nanospheres of low surface area.
The photophysical properties and the monomer–dimer equilibrium of four thiamonomethinecyanine dyes (1–4) were studied by time-resolved and steady-state spectroscopic methods. In ethanol and aqueous solution at room temperature the behaviour is mainly due to a monomer and dimer, respectively. The dimerization constant…
In the present paper there are two parts contributing to the discussion of high rate directional solidification and its application. The first part aims to characterize the high rate directional solidification of various kinds of alloys. It was found that the relevant cooling rate of the high rate directional solidifi…
On the basis of the new concept of elemental strain, used to describe a possible aging process occurring in polymeric materials, the expression for the life model, already proposed in a previous paper, must be modified, taking into account the possibility that the local strain is an elemental property of the polymer m…
This article documents the formation of a block copolymer of poly(lactic-co-glycolic acid) and polylysine via a simple coupling technique using dicyclohexyl carbodiimide (DCC). The resulting polymer has been characterized via UV-Vis spectroscopy, GPC, (1)H NMR, and elemental analysis, is soluble in a wide variety of s…
SUMMARYGeneral aspects of electropolishing of stainless steel have been reviewed. Some suitable bath parameters have been enumerated. The possible mechanisms for electropolishing of stainless steel have been briefly outlined. Various factors that affect the polishing of stainless steel have been cited. The processes o…
BACKGROUND AND PURPOSE: Intraoperative MR imaging is increasingly being used to control the extent of surgical resection; however, surgical manipulation itself causes intracranial contrast enhancement, which is a source of error. Our purpose was to investigate the potential of monocrystalline iron oxide nanoparticles…
The new standard IEC 60270/FDIS[2000] for partial discharge(PD) measurement has been published in September 2000, which builds up an integral quality assurance system for PD measurement based on the IEC 60060-2[1994]. It takes traceability of quantity as its core in order to ensure accuracy of measuring results, compa…
The limitations of currently used heart valve devices are well known. For prosthetic valves they include infection risk and thrombembolic complications; biologic devices have limited durability. Particularly for pediatric cardiac patients the problem of a lack of growth potential remains a serious issue. The multidisc…
Novel hybrid organic–inorganic catalysts constituted by iron(III) or manganese(III) 5,10,15,20-tetrakis(pentafluorophenyl) porphyrin entrapped in an alumina amorphous matrix have been prepared. The hybrid materials were obtained by a non-hydrolytic sol–gel route, through the condensation of aluminium chloride with dii…
Oxidation of gold nanoparticles protected by thiolated β-cyclodextrin molecules, leads to formation of water-soluble polycyclodextrin nanocapsules held together by S–S bonds.