Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Pressure Effects on the Disordered Phase of Block Copolymer MeltsDamian A. Hajduk, Paul Urayama, Sol M. Gruner, Shyamsunder Erramilli, Richard A. Register, Keith Brister, and Lewis J. FettersCite this: Macromolecules 1995, 28, 21, 7148–7156Publication Date (Print):Octob…
The spectrum of F-center creation has been measured for KBr:Tl by means of synchrotron radiation (12--24 eV). Analysis of the spectrum reveals the decay of cation excitons (19.7--20.3 eV) with the formation of a double amount of electron-hole pairs. The creation efficiency of a stable F center is especially high at 15…
Abstract Homogeneous precursor/precursor solutions with various compositions were obtained with appreciably high solid contents in N ‐methyl‐2‐pyrrolidone from soluble poly(amic diethyl ester) precursors of rodlike poly( p ‐phenylene biphenyltetracarboximide) (BPDA‐PDA) and flexible poly(4,4′‐oxydiphenylene biphenylte…
Indium‐tin‐oxide thin films were deposited by atomic layer epitaxy at 500°C using , , and water as precursors. The films were characterized by means of x‐ray diffraction, scanning electron microscopy, energy dispersive x‐ray analysis, polarography, and by optical and electrical measurements. The films had polycrystall…
The cationic polymerization of a cyclosiloxane mixture (hexamethyl-cyclotrisiloxane-D3, octamethylcyclotetrasiloxane-D4, decamethylcyclopentasiloxane-D5, dodecamethylcyclohexasiloxane-D6 and tetradecamethylcycloheptasiloxane-D7) in the presence of water as adjusting-control agent for molecular weight is studied in het…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Length and Temperature Dependence of the Self-Diffusion of Polyisoprene and Polybutadiene in the MeltGerald Fleischer and Matthias AppelCite this: Macromolecules 1995, 28, 21, 7281–7283Publication Date (Print):October 1, 1995Publication History Published online1 May 20…
Sulphate group: baryte celestine gypsum anhydrite. Carbonate group: calcite magnesite rhodochrosite siderite Smithsonite dolomite ankerite aragonite strontianite witherite cerussite Huntite nyerereite malachite and azurite. Phosphate group: apatite monazite. Halides: fluorite halite.
The perturbation of the racemic equilibrium of the D3 complexes of lanthanide (III) ions with 2, 6-pyridinedicarboxylate by a number of sugars is studied by circularly polarized luminescence spectroscopy. Various spectroscopic probes show that the addition of the chiral sugar has no observable effect on the structure…
The high‐frequency magnetic properties of strontium‐partially‐substituted Z‐type magnetoplumbite with the composition 2CoO·3Ba 1‐x .Sr x O.yFe 2 O 3 were studied using a hot‐pressing technique. The best properties were obtained for a sample hot‐pressed in oxygen, having x and y values of 0.5 and 10.8, respectively. Th…
A novel method of preparing modified chitosan films was developed. Bi- and tri-component chitosan films were prepared by blending chitosan with high molecular weight polyoxyethylene. The films were loaded with 8-hydroxy-7-iodoquinoline-5-sulfonic acid which was chosen as a model drug. The properties of the films were…
6,7-Dimethyl-8-ribityllumazine, the immediate biosynthetic precursor of riboflavin, is synthesized by condensation of 5-amino-6-ribitylamino-2,4(1H,3H)-pyrimidinedione with 3,4-dihydroxy-2-butanone 4-phosphate. The gene coding for 6,7-dimethyl-8-ribityllumazine synthase in Saccharomyces cerevisiae (RIB4) has been clon…
Abstract The electronic structures of conjugated polymers containing methyl radicals, carbenes, and nitrogen‐based radicals coupled in various ways through benzene rings are examined, employing band‐structure calculations in the extended Hückel approximation. The structural and electronic properties of polymers with a…
The infrared spectra of a series of metal saccharinates (those of Na, Mg, Mn Fe, Co; Ni, Zn, Cd, Pb as well as mercury(II) saccharinate and chloromercury(II) saccharinate) were studied in the region of the antisymmetric and symmetric SO2 stretching vibrations [vas(SO2) and vs(SO2) hereafter]. The results concerning th…
Abstract Epoxidized natural rubber (ENR) was first precured with 3‐aminopropyltriethoxysilane (APS) by the normal compression molding technique. The resultant sheet was further subjected to moisture cure, via hydrolysis and condensation reactions, by soaking it in water. The moisture‐cured sample, when prepared under…
The luminescence properties of Cr3+ ions and the energy transfer between Cr3+ and Nd3+ ions have been studied quantitatively in yttrium aluminum garnet (YAG). The energy level diagram and the emission spectrum of 4T2→4A2 transition of Cr3+ ions were calculated in this crystal using the single-configurational-coordinat…
The dynamics of charge carrier trapping and recombination are measured as a function of ZnO cluster diameter by ultrafast pump–probe absorption spectroscopy. A finite spherical potential well model which shows good agreement with previous experimental work is employed to predict ZnO cluster diameters from absorption o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCapped Biscalix[4]arene-Zn-Porphyrin: Metalloreceptor with a Rigid CavityDmitry M. Rudkevich, Willem Verboom, and David N. ReinhoudtCite this: J. Org. Chem. 1995, 60, 20, 6585–6587Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published…
A hyperstable (hs) variant of chicken egg-white lysozyme with enhanced thermal (delta Tm approximately +10.5 degrees C) and chemical (delta Cm for guanidine hydrochloride denaturation = +1.3 M) stabilities relative to wild-type (WT) was constructed by combining several individual stabilizing substitutions. The free en…
Photoluminescence and excitation spectra are observed for Ca(S, Se):Eu 2+ and Sr(S, Se):Eu 2+ powder phosphors at various temperatures between 4.2 and 300 K. The emission band of Ca(S 1- x Se x ):Eu 2+ at 300 K shifts almost linearly with an increase in x , from 652 nm ( x =0) to 597 nm ( x =1). In Sr(S 1- x Se x ):Eu…
Upon treatment of tribenzotriquinacene (4a) (R = H) and its centro-alkyl-substituted derivatives 4b-d (R CH3, C2H5, CH(2)Ph) with the strongly basic mixture of n-BuLi and KO(i)Pen, 2-fold deprotonation combined with (formal) elimination of RH from positions C(1)-C(10) occurs to generate tribenzacepentalene dianion 5-K…