Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTUnprecedented Two-Dimensional Polymers of Mn(II) with TCNQ-• (TCNQ = 7,7,8,8-Tetracyanoquinodimethane)Hanhua Zhao, Robert A. Heintz, Kim R. Dunbar, and Robin D. RogersView Author Information Department of Chemistry and the Center for Fundamental Materials Research Mich…
Fluorescence line-narrowing spectroscopy is used to characterize the effect of metal cation codopants (Sr 2+, La 3+, Gd 3+, Y 3+, Lu 3+, Sc 3+, and Ga 3+ ) on the state of aggregation of Eu 3+ in sol−gel silica. Significant Eu 3+ clustering occurs in samples doped only with Eu 3+ . The addition of codopants inhibits t…
Water is essential for the stability and function of biological macromolecules. High-resolution quasi-elastic neutron scattering studies of the translational dynamics of water molecules on the surface of a deuteriated protein are presented. The quasi-elastic spectra from the interfacial H2O are analysed by a confined…
2-(3-Pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1 H -imidazolyl-1-oxy, IM-3Py ( 1 ), reacts with copper(II) bis(hexafluoroacetylacetonate), Cu(hfac) 2, to give three complexes. One of them is a centrosymmetric three-spin species, Cu(hfac) 2 (IM-3Py) 2 ( 4 ), where two nitroxide ligands are pyridyl bound to the metal and…
PD testing and location is an essential part of factory testing of shielded solid dielectric power cable. The accuracy with which a PD source can be located is limited by high frequency attenuation of PD pulses as they propagate through the cable.
Self-doped sulfonic acid ring-substituted polyaniline (SPAN) reported so far is only slightly soluble in water. This work reports the synthesis route of SPAN in water with a solid content at least 50% by weight, which is stable (without precipitation) for more than 1 year and can be cast into free-standing films. The…
Adsorption of proteins (fibrinogen, albumin, and gamma globulin) from plasma onto surface-modified PUs (PU-PEO, PU-SO3, and PU-PEO-SO3) was evaluated. Adsorbed fibrinogen at steady state decreased in the order PU-SO3 > PU > PU-PEO-SO3 > PU-PEO, suggesting that sulfonate groups have specific high affinity to fibrinogen…
An investigation was carried out on the mechanism and kinetics of cure of a two-component bismaleimide formulation, composed of 4,4‘-methylenebis[maleimidobenzene] and 2,2‘-diallylbisphenol A. In-situ real time study of the progress of reaction was conducted in the temperature range from 140 to 250 °C using remote fib…
An organotitanium(IV) compound, TiCl 3 OCH 2 CF 3, 1, was found to polymerize n -hexyl isocyanate to high yields and without the formation of cyclic trimer. CpTiCl 2 L (L = −OCH 2 CF 3, −N(CH 3 ) 2, −CH 3 ), 2 − 4, respectively, likewise polymerized n -hexyl isocyanate but also polymerized isocyanates in the presence…
Host-guest peptide sets have been useful in evaluating the propensity of different amino acids to adopt an alpha-helical or beta-sheet form, and this concept is applied here to the triple-helical conformation. A set of host-guest peptides of the form acetyl-(Gly-Pro-Hyp)3-Gly-X-Y-(Gly-Pro-Hyp)4-Gly-GlyCONH2 was design…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of Hyperbranched Polymer Films Grafted on Self-Assembled MonolayersYuefen Zhou, Merlin L. Bruening, David E. Bergbreiter, Richard M. Crooks, and Mona WellsView Author Information Department of Chemistry, Texas A&M University College Station, Texas 77843-325…
The testing method for delayed fracture has not been standardized yet. The quantitative evaluation method is necessary to develop low alloy high strength steels with higher delayed fracture resistance. The sustained load tests under cathodic hydrogen charging condition have been investigated considering the severity o…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelective Catalytic Oxidation of Substrates That Bind to Metalloporphyrin Enzyme Mimics Carrying Two or Four Cyclodextrin Groups and Related MetallosalensRonald Breslow, Xiaojun Zhang, Ruo Xu, Milana Maletic, and Roland MergerView Author Information Department of Chemi…
Silanization has rendered spherical (75 ± 5 μm diameter) glass particles to be weakly (sample A, ϑ = 55°), moderately (sample B, ϑ = 72°), and highly (sample C, ϑ = 90°) hydrophobic. Nonequilibrium surface pressure (Π) vs surface area ( A ) isotherms have been determined for monoparticulate layers which were prepared…
CO adsorption on palladium–ceria catalysts prepared from Pd acetylacetonate has been investigated by IR and UV–VIS spectroscopies and by volumetric measurements. After calcination and evacuation at 673 K, the samples contain small PdO particles which are immediately reduced upon adsorption of CO at room temperature. F…
We use self-consistent-field calculations and scaling arguments to determine the behavior of AB diblock copolymers that are tethered to a surface. While the surrounding solution is assumed to be a poor solvent for both components, the B block is considered to be less soluble than the A. The solvophobic interactions wi…
A one-dimensional compound with a Mn(III)−NC−Fe(III) linkage of the formula of [NEt 4 ] 2 [Mn(acacen)][Fe(CN) 6 ] (NEt 4 = tetraethylammonium, acacen = N, N ‘-ethylenebis(acetylacetonylideneaminato)) has been prepared by the assembly reaction of [Mn(acacen)Cl] and [NEt 4 ] 3 [Fe(CN) 6 ] in ethanol/2-propanol. The comp…
Heteropolyacids (HPAs) possess both acidic and redox catalytic properties and held extensive promise of practical application. These type of compound display a great potential of specific synthesis reactions for replacing sulfuric acid to satisfy the requirements of environmental protection. Heterogenizing HPAs would…
The synthesis, crystal structure, and properties of [Mn II (MCPA) 2 (H 2 O) 2 ] n (MCPA = 2-methyl-4-chlorophenoxyacetic acid), 1, a 2-D manganese carboxylato polymer is reported. The synthesis of 1 has been achieved via the reaction of MCPA with MnCl 2 ·2H 2 O and NaHCO 3 in methanol. Crystal structure data: [C 18 H…
A new conjugated aromatic poly(azomethine) derivative, poly(3‘,4‘-dibutyl-α-terthiophene−azomethine-1,4-phenylene−azomethine) (PBTPI), has been prepared by polycondensation of 2,5‘‘-diformyl-3‘,4‘-dibutyl-2,2‘:5‘,2‘‘-terthiophene with 1,4-phenylenediamine under the ethanothermal conditions. The red polycrystalline PBT…