Materials Literature
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We discuss theoretical and experimental aspects of the array formation of nano-colloids in two-dimensional (2D) situations. In particular, we treat metal nanocrystals which have been passivated by surfactant monolayers and then deposited on the free surface of water. Their self-organization properties follow from the…
Fructose 1,6-bisphosphate aldolase catalyzes the reversible cleavage of fructose 1,6-bisphosphate and fructose 1-phosphate to dihydroxyacetone phosphate and either glyceraldehyde 3-phosphate or glyceraldehyde, respectively. Catalysis involves the formation of a Schiff's base intermediate formed at the epsilon-amino gr…
Transformation temperatures and mechanical properties such as transformation stresses at different temperatures, superelasticity characteristics, and load cycling behavior have been investigated in NiTiCu orthodontic archwires with various copper concentrations. The results have been compared with the conventional NiT…
A D4-symmetric chiral dioxoruthenium(VI) porphyrin can effect stoichiometric and catalytic enantioselective hydroxylation of benzylic C–H bonds to give enantioenriched aryl alcohols, the highest ee of 76% being attained in the catalytic oxidation of 4-ethyltoluene with 2,6-dichloropyridine N-oxide as terminal oxidant;…
Abstract Toxic effects have been reported due to the accumulation of Cu in soils receiving long‐term applications of swine ( Sus scrofa ) manure, sewage, municipal composts, and mining waste. The objective of this study was to quantify sorption and desorption of Cu on various clay and clay‐organic matter fractions sep…
The specific heat of the colossal magnetoresistance material ${\mathrm{Nd}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$ is reported for $0.35<~T<~280\mathrm{K},$ $H=0$ and $1<~T<~120\mathrm{K},$ $H=9\mathrm{T}.$ The results include a Schottky-like specific-heat anomaly for the Nd ordering, an ``attenuati…
A samaria‐doped celia (SDC) interlayer was used to avoid unfavorable solid‐state reactions when using (LSC) as a cathode on yttria‐stabilized zirconia electrolyte. A porous LSC cathode prepared on a thin and dense SDC interlayer exhibited very high performance even at . The performance was enhanced further by dispersi…
Mesoporous metallic tin has been electrodeposited, from the homogeneous hexagonal mesophase of a series of amphiphilic non-ionic surfactants, with a controllable repeat structure in the range of 5–10 nm.
A series of trialkoxysilane-capped PMMA–titania hybrid optical thin films has been prepared by an in situ sol–gel process combined with spin coating and multi-step baking. The used acrylic monomers were methyl methacrylate (MMA) and 3-(trimethoxysilyl)propyl methacrylate (MSMA). Titanium(IV) n-butoxide was used for th…
Deposition of thin and conformal copper films has been examined using atomic layer deposition as possible seed layers for subsequent electrodeposition. For this investigation, the copper films were deposited on glass plates as well as on , , and films on silicon wafers. Typical resistivities of these films ranged from…
Active oxygen species and the reaction mechanism for catalytic CO oxidation with O2 on a highly active Fe2O3-supported Au catalyst (denoted as Au/Fe(OH)3*), which was prepared by supporting Au(PPh3)(NO3) on as-precipitated wet iron hydroxide followed by calcination at 673 K, have been studied by means of oxygen isotop…
The 2D honeycomb-like layered iron(III)–nickel(II) cyanide-bridged complex [Ni(cyclam)]3[Fe(CN)6]2·nH2O exhibits ferromagnetic intralayer and antiferromagnetic interlayer interactions; above 3 K the magnetic properties are typical of a metamagnet with Hc = 5000 G, whereas below 3 K a canted structure is formed, leadin…
The twin benefits of cost savings and better weld properties have led Boeing to switch to friction stir welding for use on its Delta rocket programm.
Conductive adhesives are composites of polymer matrixes and metal fillers (conductive elements). Silver (Ag) flakes are widely used as fillers for electrically conductive adhesives (ECAs). Generally, there is a thin layer of organic lubricant coated on the commercial Ag flake surface. This lubricant layer is needed fo…
Nickel nanowires of 4 nm diameter were formed in the cavity of carbon nanotubes with an inner diameter of 20 nm.
The influence of thermal annealing on cation disorder in ABi 2 Nb 2 O 9 (A=Sr, Ba) has been studied using synchrotron powder X-ray diffraction methods. BaBi 2 Nb 2 O 9 adopts a tetragonal (I4 1 /mmm) structure, whilst SrBi 2 Nb 2 O 9 is orthorhombic, space group A2 1 am, irrespective of the annealing conditions. In bo…
A novel finding of mechano-catalytic overall water splitting by metal oxides, a way to produce hydrogen by water decomposition, is reported. It was clearly revealed that some simple and mixed oxide powders such as NiO, Co3O4, Cu2O, Fe3O4, and CuMO2 (M=Al, Fe, Ga), when suspended in distilled water by magnetic stirring…
Fluorescence is one of the molecular spectroscopic properties that is enhanced by placing the molecule on the rough surface of a coinage metal. The surface-enhanced fluorescence (SEF) can be directly observed in steady-state fluorescence experiments. The observations are the results of a delicate balance between the e…
Individual single-wall carbon nanotubes (SWNTs) and bundles can be obtained over different types of supported metal catalysts by decomposition of ethylene, similar to the synthesis of multi-wall carbon nanotubes.
An overview of the deposition and deposition techniques (with the emphasis on PVD techniques) of high- T c material is presented. The major technologies are discussed and compared, and advantages and problems of various substrate materials are illustrated. The consequences connected with lattice mismatch are discussed…