Materials Literature
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Tissue engineering is a relatively young field that combines engineering, clinical science, and life sciences to, in part, repair or regrow tissues. Adipose tissue has recently become a focus area for tissue engineering, encouraged by the large number of reconstructive, cosmetic, and correctional indications that coul…
The dielectric constant of quantum paraelectric ${\mathrm{EuTiO}}_{3},$ which contains ${\mathrm{Eu}}^{2+}$ with $S=7/2$ spin and ${\mathrm{Ti}}^{4+},$ has been measured under a magnetic field. The dielectric constant shows a critical decrease at the antiferromagnetic ordering of the Eu spins at 5.5 K, as well as a su…
In situ synchrotron wide-angle X-ray diffraction (WAXD) was used to monitor crystallization of isotactic polypropylene (i-PP) in the subcooled melt at 140 °C after step shear. The melt was subjected to a shear strain of 1430% at three different shear rates (10, 57, and 102 s -1 ) using a parallel-plate shear apparatus…
Abstract The complex formation of organogels based on poly( N ‐vinylcaprolactam) (PVCa) and organic dyes [5‐(4‐dimethylaminobenzylidene) rhodanine, α‐nitroso‐β‐naftol, and dithizone] and the properties of the complexes in salt aqueous solutions were studied. PVCa gels absorbed these dyes in organic media (ethanol and…
Syntheses, lanthanide quantitative analyses, mass spectrometry and luminescence spectroscopy, and decay dynamics of crystals containing pentanuclear hetero-lanthanide(III) nanoclusters [(Ln'(5-x)Ln(x))(NO(3))(6)(mu(5)-OH)(mu(4)-L)(2)] (0 < or = x < or = 5), Ln' = Eu or Tb; Ln = La-Nd, Sm-Ho (hereafter Ln'(5-x) Ln(x))…
Homopolymerization of the unsaturated cyclic ester, 6,7-dihydro-2(5 H )-oxepinone (DHO), and copolymerization with ε-caprolactone (εCL) are an easy way to produce unsaturated aliphatic polyesters in a controlled manner. Polymerization of DHO initiated by Al(O i Pr) 3 in toluene at room temperature proceeds by a coordi…
In this work, the synthesis of a novel substituted bisphthalocyanine, the bis[octakis(propyloxy)phthalocyaninato] samarium(III) complex, is reported. Langmuir−Blodgett (LB) films of this compound have been prepared. The influence of the propyloxy groups in the structure of the LB films and in their spectroscopic, chem…
Abstract Segmented polyurethane (PU) films from castor‐oil‐based PU prepolymer with different hard‐segment compositions and nitrolignin (NL) were synthesized. Diisocyanates (DIs), such as 2,4‐tolylene DI (TDI) and 4,4′‐diphenylmethane DI (MDI), 1,4‐butanediol (BDO) as a chain extender, and trimethanol propane (TMP) as…
Heterologous expression of the phaGPs and the phaClPs genes encoding 3-hydroxyacyl acyl carrier protein-coenzyme A transacylase and polyhydroxyalkanoate (PHA) synthase from Pseudomonas sp. 61-3, respectively, was performed in the phbCRe negative mutant, Ralstonia eutropha PHB-4. The recombinant strain of the R. eutrop…
Abstract The synthesis of aromatic polyphosphonates based on the step polymerization of various bisphenols and dichlorophenyl phosphine oxide was investigated. The effect of catalyst, type, concentration, and polymerization time were systematically varied to obtain high molecular weight polymers. Very high molecular w…
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…