Materials Literature
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Abstract Extremely high benzyl acetate selectivity (ca. 94%) at a toluene conversion of ca. 60% was achieved over Pd–Cu–TiO2 catalyst for the first time by gas phase acetoxylation of toluene with good long-term stability.
The finite length of polymer chains affects both the static and the relaxation properties of the density of the melt state. These have been investigated by molecular-dynamics simulations of a Lennard-Jones model with fixed bond length. Under isothermal–isobaric conditions the density increases with the molecular weigh…
The microphase separation of a solvent-sensitive self-assembling block copolymer, poly(2-phenoxyethyl vinyl ether)- block -poly(2-methoxyethyl vinyl ether) (pPhOVE−pMOVE), in acetone/water mixture was investigated by small-angle neutron scattering (SANS). Acetone solutions of pPhOVE−pMOVE undergo tremendous viscosity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDithiadiazafulvalenes: Promising Precursors of Molecular MaterialsD. Lorcy and N. BellecView Author Information Groupe Hétérochimie et Matériaux Electroactifs, Institut de Chimie de Rennes, UMR-CNRS 6510-Université de Rennes 1, Campus de Beaulieu, Bât 10A, 35042 Rennes Cedex…
Human gankyrin (226 residues, 24.4 kDa) is a liver oncoprotein that plays an important role in the development of human hepatocellular carcinomas. In this paper, its solution structure is reported, which is the largest ankyrin protein ever determined by NMR. The highly degenerate primary sequences of the seven ankyrin…
In this paper a detailed study of the La 1− x Ca x MnO 3 ( ) phase diagram using powder x-ray diffraction and magnetization measurements is presented. The lack of well characterized samples has resulted in confusion as regards the underlying physics of this complicated system. As the present study reveals, two distinc…
Reaction of the bis-tridentate ligand bis[1-ethyl-2-[6'-(N,N-diethylcarbamoyl)pyridin-2'-yl]benzimidazol-5-yl]methane (L2) with Ln(CF(3)SO(3))(3).xH(2)O in acetonitrile (Ln = La-Lu) demonstrates the successive formation of three stable complexes [Ln(L2)(3)](3+), [Ln(2)(L2)(3)](6+), and [Ln(2)(L2)(2)](6+). Crystal-fiel…
The kinetics of crystallization of poly-N-isopropylacrylamide (PNIPAM) particles has been investigated using the UV-visible transmission spectroscopy. Since the particle size decreases with the increase in temperature, microgel dispersions of different volume fractions have been obtained by varying the temperature of…
Among the proteinogenic amino acids, only proline is a secondary amine and only proline has a saturated ring. Electronegative substituents on C-4 (that is, C(gamma)) have a substantial effect on the trans/cis ratio of the prolyl peptide bond and the pucker of the pyrrolidine ring. 2-Azabicyclo[2.1.1]hexane is, in esse…
The retention performance of aroma molecules from different chemical classes (e.g., alcohols, esters, aldehydes, and terpenes) by silica particles made by hydrolysis of tetraethyl orthosilicate is investigated. Since particle morphology, porosity, and pore size distribution can be controlled by the sol-gel preparation…
The effects of triblock copolymer architecture (ABA-type vs ABC-type) and the degree of functionalization on the organoclay dispersion in nanocomposites were investigated using X-ray diffraction (XRD), transmission electron microscopy (TEM), and linear dynamic viscoelasticity. For the study, a lamella-forming polystyr…
Novel biodegradable amphiphilic polymers composed of hydrophobic polyphosphate grafted with well-defined hydrophilic poly[2-methacryloyloxyethyl phosphorylcholine (MPC)] were newly synthesized. 2-Isopropyl-2-oxo-1,3,2-dioxaphospholane and 2-(2-oxo-1,3,2-dioxaphosphoroyloxyethyl-2-bromoisobutylate) (OPBB) were copolyme…
Much attention has been paid to the natural mechanism of silkworm spinning due to the impressive mechanical properties of the natural fibers. Our results in the present work show that the fractional changes of the conformational components in regenerated silk fibroin (SF) extracted from Bombyx mori fibers is remarkabl…
Oxygen molecule adsorptions on a Pu (100) surface have been studied in detail, using the generalized gradient approximation to density functional theory. Dissociative adsorption with a layer by layer alternate spin arrangement of the plutonium layer is found to be energetically more favorable compared to molecular ads…
We compare magnetoresistances (MR) and switching currents (I_s) at room temperature (295K) and 4.2K for Permalloy/N/Permalloy nanopillars undergoing current-induced magnetization switching (CIMS), with non-magnetic metals N = Cu, Ag, and Au. The N-metal thickness is held fixed at 10 nm. Any systematic differences in M…
We have prepared a series of polycrystalline samples La 0.5 Sr 0.5 CoO 3−δ with and characterized their oxygen content, crystal structure, and magnetic properties. While the fully oxygenated samples are good ferromagnets, samples with larger δ values display increasingly broad magnetic transitions. The saturation magn…
We report studies on the synthesis of gold nanorods by a three-step seeding protocol method using a variety of different gold seeds. The synthetic method is adapted from one we published earlier (Jana et al. J. Phys. Chem. B 2001, 105, 4065). The seeds chosen for these studies have average diameters in the range from…
Abstract Dispersion behavior of monmorillonite (MMT) is investigated in ethylene vinyl acetate (EVA)/MMT nanocomposite with various vinyl acetate content. Maleic anhydride (MAH) grafted polyethylenes with various MAH contents are used as a compatibilizer to enhance the dispersion of MMT. DMA and XRD studies indicate t…
Abstract A novel process for the preparation of poly(propylene)/montmorillonite (PP/MMT) nanocomposites was developed via simultaneous solution grafting‐intercalation in the presence of a reactive ammonium cation that can be grafted onto poly(propylene). Partially introducing this reactive cation into long alkyl ammon…
Abstract Interpenetrating polymer networks (IPNs) of glycerol modified castor oil polyurethane (GC‐PU) and poly(2‐ethoxyethyl methacrylate) poly(2‐EOEMA) were synthesized using benzoyl peroxide as initiator and ethylene glycol dimethacrylate (EGDM) as crosslinker. GC‐PU/poly (2‐EOEMA) interpenetrating polymer networks…