Materials Literature
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The hydroxysilsesquioxanes ( c -C 5 H 9 ) 7 Si 8 O 12 (OH) ( I ) and ( c -C 5 H 9 ) 7 Si 7 O 9 (OH) 2 OSiMePh 2 ( II ) have been studied as model supports for silica-grafted aluminum alkyl species. Treatment of AlMe 3 with I gave polymeric {[( c -C 5 H 9 ) 7 Si 8 O 13 ]AlMe 2 } n ( 1a ), which is readily transformed i…
Abstract Polyamide 6,6 (PA6,6)/maleated styrene–hydrogenated butadiene–styrene (SEBS) blends filled with up to 20% spherical glass beads (GBs) were prepared by extrusion and subsequent injection molding. Tensile and impact tests were used to examine the effect of GB additions on the mechanical behavior of PA6,6/SEBS–…
Steady-state and time-resolved fluorescence measurements were conducted on newly synthesized Frechet-type dendrimers with naphthalene peripheral groups in homogeneous and sodium dodecyl sulfate (SDS) micellar solutions. Intense excimer emission was observed for the third-generation dendrimer 3 but not for the first-ge…
Abstract Effects of filler and rubber polarity on the distribution of filler in butadiene/nitrile rubber (BR/NBR) blends were investigated, using the dynamic mechanical thermal analysis technique. As 30‐phr filler is added, the reduction in heights of damping peaks (tan δ max ), attributed to the dilution effect, was…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTReversible [7]-Thiahelicene Formation Using a 1,2-Dithienylcyclopentene PhotochromeTyler B. Norsten, Andrea Peters, Robert McDonald, Meitian Wang, and Neil R. BrandaView Author Information Department of Chemistry, University of Alberta Edmonton, AB, Canada T6G 2G2 Cite…
Abstract Ring‐opening metathesis copolymerizations of cyclooctene and the polyhedral oligomeric silsesquioxane (POSS) monomer 1‐[2‐(5‐norbornen‐2‐yl)ethyl]‐3,5,7,9,11,13,15‐heptacyclopentylpentacyclo[9.5.1.1 3,9 .1 5,15 .1 7,13 ] octasiloxane (POSS–norbornylene) were performed with Grubbs's catalyst, RuCl 2 (CHPh)(PC…
We report the surfactant-free synthesis of new, film-forming vinyl polymer/silica colloidal nanocomposites by copolymerization of 4-vinylpyridine (4VP) with either n -butyl acrylate ( n -BuA) or n -butyl methacrylate ( n -BuMA) in the presence of an ultrafine aqueous silica sol. Highly transparent, free-standing nanoc…
Gelatin, a natural macromolecular proteic material from renewable resources, is widely used in many industrial applications. In this study gelatin scraps, deriving from pharmaceutical capsule productions, were turned into films by casting water solutions or suspensions producing flexible and consistent films. Gelatin…
The complexes [Ni(S2C2Me2)2](z) (z = 0, 1-, 2-) have been isolated for the purpose of investigating their electronic structures in a reversible three-member electron-transfer series. Members are interrelated by reversible redox reactions with E(1/2)(0/1-) = -0.15 V and E(1/2)(1-/2-) = -1.05 V versus SCE in acetonitril…
Atomic force microscopy (AFM) is a mechanical profiling technique that allows to image surfaces with atomic resolution. Recent progress in reducing the noise of this technique has led to a resolution level where previously undetectable symmetries of the images of single atoms are observed. These symmetries are related…
Diarylethenes 1a-4a, having a fluorescent 2,4,5-triphenylimidazole chromophore in the aryl group, were synthesized. Upon excitation of the triphenylimidazole chromophore with 366 nm, 1a-4a underwent photocyclization reactions, and the solutions containing 1a-4a changed color from colorless to red-purple or to blue. Th…
The nature of insulating state driven by electronic correlations in the quarter-filled ladder compound $α'$NaV$_{2}$O$_{5}$ is investigated within a cluster dynamical mean-field approach. An extended Hubbard model with first-principle tight-binding parameters have been used. It is shown that the insulating state in th…
The preparations, X-ray structures, and detailed physical characterizations are presented for two new mixed-valence tetranuclear manganese complexes that function as single-molecule magnets (SMM's): [Mn4(hmp)6Br2(H2O)2]Br2-4H2O (2) and [Mn4(6-me-hmp)6Cl4]-4H2O (3), where hmp(-) is the anion of 2-hydroxymethylpyridine…
In this work, a question is tackled concerning the formation of a superconducting condensate in an earlier proposed model of "elastic jelly", in which phonons of the valent skeleton play the part of initiating ones. It was shown that in distinction from the BCS theory, the momenta of forming electron couples are diffe…
The Ge(001)-(2 1 0 3)-Pb surface reconstruction with a lead coverage of 5/3 monolayer is on the borderline between the low-coverage covalently-bonded and high-coverage metallic lead overlayers. This gives rise to an unusual low-temperature phase transition with concomitant changes in the bonding configuration. Both th…
A series of chitosan/chitin samples with DA's varying between 5.2 and 89% was prepared from the reacetylation under soft conditions of a unique chitosan sample allowing the preservation of the chain distribution. The study of the variation of pH for the same concentration of amine groups, at different ionic strengths,…
Siliceous ordered mesoporous materials are well-investigated and -covered by several excellent reviews. Less work has been directed to non-siliceous materials, although these could have more wide-ranging applications. This review will address the synthesis and properties of non-siliceous ordered mesoporous materials,…
Rigorous coupled wave analysis (RCWA) approach is employed to determine electromagnetic (EM) scattering from cylindrical (circular and noncircular) spatially, inhomogeneous, anisotropic material objects. From the late 70's to the present, the RCWA approach has become an extremely important technique for the study of E…
Photocatalytic properties of obliquely deposited TiO<SUB>2</SUB> thin films with various shaped columns were investigated. The columnar films such as zigzag, cylinder and helix were prepared by dynamic oblique deposition (DOD) method. It was found that the optimum morphology for surface photocatalytic reaction has bee…
We investigated the interaction of a laser-induced cavitation bubble with an elastic tissue model by high-speed photography with up to 5 Mill. frames/sec. The elastic material consisted of a transparent polyacrylamide (PAA) gel whose elastic properties can be controlled by modifying the water content to mimic various…