Materials Literature
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RATIONALE AND OBJECTIVES: To compare the effect on image quality of a 1.0 mol/L gadolinium chelate with that of two 0.5 mol/L gadolinium compounds. MATERIALS AND METHODS: Five healthy volunteers underwent a mono-station 3D MRA exam (Siemens SONATA, Erlangen, Germany) four times using four separate gadolinium preparati…
Metal 1,4,8,11,15,18,22,25-octakis(hexylsulfanyl)phthalocyanines exhibit a weak absorption band in the 450-600 nm region, leading to novel dyes that include the red lead metallated derivative that has been characterised by X-ray crystallography.
Abstract Polystyrene‐Organo Montmorillonite (PS‐MMT) nanocomposites were prepared by suspension free radical polymerization of styrene in the dispersed organophilic montmorillonite. The results of X‐ray diffraction (XRD) and Transmission Electron Microscopy (TEM) indicated that exfoliated nanocomposites were achieved.…
Disulfide-linked cyclic porphyrin oligomers from dimer to tetramer can be selected and amplified virtually quantitatively from a dynamic combinatorial library using bis-thiol substituted zinc(II) porphyrin units with appropriate amine donor templates.
Abstract The foaming of aluminum melt of LKR‐Austria is investigated. The foaming was performed in a furnace chamber at adiabatic conditions to keep the foam in liquid state. The foams were taken out from the chamber after 1, 10 and 100 min isothermal holding time and cooled in air or quenched in water. The final cell…
N,N,N,N-Tetramethylammonium dicyanamide (Me4NDCA) has been examined via differential scanning calorimetry (DSC), thermogravimetric analysis, conductivity, single crystal X-ray diffraction and 1H nuclear magnetic resonance (NMR) analyses, and was found to be highly conductive in the solid state (σ = 10−3 S cm−2 at 420…
Precipitations in Mg–Li–Zn ternary alloys containing 4 to 13%Li and 4 to 5%Zn (in mass%) with α or β single phase, or with (α+β) dual phases were investigated using a micro-Vickers hardness measurement and transmission electron microscopy. Age hardening in the α phase alloy was found to occur, which was attributed to…
The cruciform pentamers 3a-g were synthesized by a combined Horner-Sonogashira approach; their band gaps vary significantly with emission varying from blue to red depending upon their substituent pattern.
Real-time, temperature-resolved synchrotron powder X-ray diffraction data and Rietveld refinements were used to investigate the behavior of the todorokite structure from 100 to 820 K. At 298 K, the lower valence cations, such as Mn 3+ , occupy large octahedral sites at the edges of the triple chains, and four water/ca…
Ordered self-supported ultrathin carbon nanowire arrays with small mesopore sizes have been fabricated for the first time employing mesoporous silica MCM-41 as the templates, and two possible related mechanisms are proposed.
Because the rate of anodic deposition for manganese oxide is much larger than that for nickel oxide, the nickel content of binary Mn-Ni oxide can be increased by using a relatively positive potential region and a high Ni 2 + / Mn 2 + ratio (10/1) in the deposition solution. The capacitive characteristics of this binar…
This is a review of properties of PbB' 0.5 B'' 0.5 O 3 perovskites, which hold a special position among ferroelectric and antiferroelectric perovskites because of the presence of two sorts of B ions in the sublattice of the oxygen octahedra. The B' and B'' ions may be ordered, disordered or partially ordered, and this…
ABSTRACT Oxygen permeation characteristics of whey protein isolate (WPI) coatings on polypropylene (PP) films were investigated to examine the feasibility of WPI coating as a novel biopolymer oxygen barrier for food packaging applications. Heat‐denatured aqueous solutions of WPI with several plasticizers including gly…
Poly(ethylene oxide) brushes have been covalently bound to glass surfaces and their presence was demonstrated by an increase in water contact angles from fully wettable on glass to advancing contact angles of 54 degrees, with a hysteresis of 32 degrees. In addition, electrophoretic mobilities of glass and brush-coated…
Chitooligosaccharides, the oligomers made up of beta-1,4-linked D-glucosamine, are obtained by partial hydrolysis of chitosan, a deacetylation product of chitin. The antioxidant activity of various chitooligosaccharides was tested in vitro with aminoguanidine, pyridoxamine, and Trolox as reference compounds. Hydroxyla…
The syntheses of linear and star-shaped light harvesting polymers with well defined structure and narrow molecular weight distribution are described. These polymers have ruthenium polybipyridine moieties as the energy trap cores and styrene functionalized coumarin monomers as the light absorbing antenna chromophores.…
A cyclocopolymer containing pyrrolidinopyridine pendant groups was dendronized with polyester dendrons terminated with long alkyl chain ends and the microenvironment created by the dendrons was used to catalyze the difficult esterification of a tertiary alcohol with pivalic anhydride.
Novel composite resins possessing good luminescent properties have been synthesized through a free radical copolymerization of styrene, α-methylacrylic acid and the binary or ternary complexes of lanthanide ions (Eu3+ and Tb3+). These polymer-based composite resins not only possess good transparency and mechanical per…
Mesoporous benzene–silica hybrid materials have been obtained via surfactant-mediated synthesis using alkyltrimethylammonium surfactants with alkyl chain lengths from 14 to 18. By combining N2 adsorption–desorption experiments and powder X-ray diffraction (PXRD) analysis we showed that these samples exhibited mesopore…
Low-cost, colloidal deposition methods have been utilized to produce novel solid oxide fuel cell (SOFC) structures on metal alloy support electrodes. Yttria-stabilized zirconia (YSZ) films were deposited on iron-chrome supports on top of a thin Ni/YSZ catalytic layer, and sintered at 1350°C, in a reducing atmosphere.…