Materials Literature
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An ultrathin (ca. 5.6 nm thick), closely packed (self‐assembly), tightly interconnected (two‐dimensional polymer), and water‐repellent (>130° of the contact angle with water) film was prepared by modification of an 11‐mercapto‐1‐undecanol self‐assembled monolayer adsorbed on a copper surface with 1,2‐bis(trichlorosily…
[PMo12O40(VO)2]5- is a highly reduced cluster with eight d metal electrons. The localization−delocalization nature of d metal electrons is one of the points of interest in reduced polyoxoanions. We report DFT calculations which suggest that the oxidation state of the V atoms is +4 and that the other six metal electron…
Many known occurrences of the zeolites erionite and offretite have been characterized by electron probe microanalysis, X-ray powder diffraction, and optical microscopy. For the first time, a substantial amount of experimentally consistent and homogeneous chemical and crystallographic data have been evaluated for these…
Polycaprolactone (PCL) was grafted onto starch through introduction of urethane linkages. The grafting reaction was carried out in two steps. The first step was the reaction of hydroxyl-terminated PCL with 2,4-tolylene diisocyanate. The isocyanate terminated PCL was then reacted with starch to obtain starch-graft-poly…
Scanning electrochemical microscopy (SECM) in ferrocyanide and bromide solutions was used to locate active sites (pitting precursors) on polycrystalline Ti where oxidation of Br − and Fe ( CN ) 6 4 − was possible. Analysis of the electroctro‐chemically active sites was done by using electron microscopy (SEM), energy d…
The ferromagnetism of the inhomogeneous crystalline structure arising below the temperature of the martensitic phase transition is considered using a phenomenological expression for the Helmholtz free energy of a cubic crystal. The magnetic anisotropy of the martensitic structure is related to the order parameter of t…
Copolymerization of glycolide (Glyc) and L-lactide (L-Lac) were conducted at 150°C in bulk to prepare random copolyesters. Four resorbable catalysts were used and compared: ZnCl2, ZnI2, Zn stearate (ZnSte2) and Zn lactate (ZnLac2). Separate time-conversion curves were recorded for glycolide and lactide by means of 1H…
New photoisomerizable chiral dopants have been studied. The dopants used were menthone derivatives, a chiral stilbene derivative and a nematic copolymer of a menthone derivative and a benzoyloxybenzonitrile derivative. NMR, HPLC and UV results showed that the E-Z-isomerization of all the compounds indicated proceeded…
The structures of carbonaceous deposits obtained through laser ablations using targets composed of C, Ni, and Co under various Ar gas pressures were studied. The pressure dependence of the target's surface morphology and the structure was also studied. When the pressure was 100 Torr or below, only carbon was evaporate…
Polystyrene/polyethylene composites have been prepared by the heterogeneous radical polymerization of styrene within supercritical carbon dioxide−swollen high density polyethylene (HDPE) substrates. Composition of the composites can be controlled with reaction time and initial ratio of styrene to HDPE. The polystyrene…
Alloys of NiTi have gained popularity in biomedical applications; however, Ni is known to cause toxic and allergic reactions in the body, and concerns have been expressed regarding the material's biocompatibility. In this study, coupons of equiatomic NiTi were prepared by four methods, namely, mechanically polishing t…
A large single crystal (about 30 mm in diameter by 20 mm long) of the Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 (PZN–PT) solid solution system was successfully grown using the vertical Bridgeman method and its properties were investigated. No defects such as flux inclusions were observed on as-polished {100} plates, except in a…
MCM-41 materials of six different pore diameters were prepared and characterized using X-ray diffraction, transmission electron microscopy, helium pycnometry, small-angle neutron scattering, and gas adsorption (argon at 77.4 and 87.4 K, nitrogen and oxygen at 77.4 K, and carbon dioxide at 194.6 K). A recent molecular…
The use of nitroxide-mediated ‘living’ free radical procedures as a synthetic tool for obtaining polymers with well defined and complex macromolecular architectures is discussed. The preparation of linear homo, block, and random co-polymers by ‘living’ free radical procedures have been demonstrated for a variety of sy…
Three bimetallic assemblies, PPh 4 [Ni(pn) 2 ][M(CN) 6 ]·H 2 O (M = Fe ( 1 ), Cr ( 2 ), Co ( 3 ); pn = rac- 1,2-diaminopropane), have been prepared and structurally and magnetically characterized. Assembly 2 crystallizes in the monoclinic system of the space group P 2/ c (No. 13) with a = 12.927(2) Å, b = 8.454(2) Å,…
Nanocomposites, consisting of a hard magnetic rare earth–transition metal phase exchange coupled to soft magnetic α-Fe or α-(Fe,Co), exhibit enhancement of the remanent magnetization due to exchange coupling across interfaces between grains. Modeling studies have shown that crystallite sizes of less than 20 nm are gen…
Abstract Fusion-bonded epoxy coating is extensively used to enhance the corrosion resistance of reinforcing steel. The bond strength between these bars and the concrete is expected to be less than that of the uncoated bars and it may be further impaired due to prolonged exposure to thermal variations. This investigati…
The die upset of hot pressed NdFeB magnets modifies the equiaxed grains to platelets, develops the c-axis texture parallel to press direction, and improves magnetic properties. The mechanism of c-axis alignment has been suggested to be a combination of grain-boundary sliding and anisotropic grain growth in a direction…
An analysis is given of recent electron paramagnetic resonance (EPR) experiments in manganite materials displaying colossal magnetoresistance behavior. These experiments have established that in highly homogeneous samples characterized by a single resonance line, the EPR linewidths above the critical region associated…
Oxomolybdenum phthalocyanine (MoOPc) and tin phthalocyanine (SnPc), which both have a pyramidal molecular shape, were deposited onto sapphire by organic molecular beam deposition. The crystalline phase of these films was determined to be triclinic by X-ray diffraction and absorption spectra with reference to previousl…