Materials Literature
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Acrylic monomers and polymers have been intercalated in the lamellar structure of an iron substituted nickel layered double hydroxide (LDH) (Ni:Fe=7:3). The synthesis consists of an original step-by-step soft chemistry preparation route in which the formation of the Ni0.7 Fe0.3O2 slabs is dissociated from intercalatio…
A new Monte-Carlo program for simulation of low energy electron scattering in solids is presented. Applications to electron microscopy and electron microprobe analysis are discussed. Elastic interactions are described by Mott cross sections within the framework of partial wave analysis (PWA) whereas the inelastic coll…
Abstract This work examines the influence of well‐defined diblock copolymers on the interfacial tension and morphology of an immiscible polymer blend. The system studied is a blend of 80% polystyrene and 20% ethylene propylene copolymer compatibilized by diblock copolymers of poly(styrene‐hydrogenated butadiene). The…
Nitrogen dioxide was applied for molecular beam epitaxy of ZnO on (0001) sapphire substrates. Equipped with liquid nitrogen cryoshrouds, the pressure inside the chamber was kept below 1×10 -7 Torr during growth. The samples were characterized by reflection high energy electron diffraction, X-ray diffraction, photolumi…
Ligand-assisted templating with carboxylate surfactants is used to produce micro- and mesoporous zirconias in a method where the organic template can be removed with a simple acid treatment obviating the usual harsh calcination conditions required to remove templates from transition metal oxide molecular sieves. A new…
Enzymatic and non-enzymatic iodination of the amino acid tyrosine is a well known phenomenon. The iodination technique has been widely used for labeling proteins. Using high-resolution X-ray crystallographic techniques, the chemical and three-dimensional structures of iodotyrosines formed by non-enzymatic incorporatio…
We propose a hydrodynamic model that justifies the surface viscosity already introduced as a phenomenological parameter in the surface dynamics of nematic liquid crystals. In this model the surface orienting field of a substrate is assumed to be diluted in a thin boundary layer that is described by the balance equatio…
The preparation and characterization of the properties of mullite ceramic foams suitable for diesel exhaust filtration systems are described. Two foams of different cell sizes, 32 and 61 ppi (pores per inch), were prepared from slurries by the replication process with polyurethane sponges as the templates. The microst…
The non-enzymatic deamidation of Asn to Asp is known to occur in proteins and peptides and is accelerated by phosphate buffer [Tyler-Cross, R. and Schirch, V. (1991) J. Biol. Chem. 25, 22549-22556]. We attempted to identify the site in lysozyme where a phosphate ion binds by means of 1H-15N HSQC measurements of 15N-la…
Preferentially (105)-oriented Sr 0.7 Bi 2.8 Ta 2 O 9 (SBTO) thin films on SiO 2 /n-Si(100) have been prepared by a pulsed laser deposition method at temperatures as low as 350°C, which is the lowest process temperature for growing SBTO ferroelectric thin films. Dielectric properties of SBTO films have been improved by…
Polycrystal plasticity models are commonly developed with a narrow focus on the grain as the fundamental unit of crystallographic orientation and anisotropic behavior. However, deformation and strengthening mechanisms occur simultaneously at multiple length scales and may lead to bulk deformation behavior of metals th…
Phase diagrams of SrTiO3-based solid solutions with PbTiO3, BaTiO3, and CaTiO3 have been analyzed using our own experimental data and some data from the literature on dielectric, ultrasonic, and optical properties. At small concentration x of the second end-member of solid solutions, ferroelectric phase transition tem…
We have synthesized and characterized the following four metalloporphyrins: Fe(OEP)(CO)(1-MeIm), Ru(OEP)(CO)(1-MeIm), Os(OEP)(CO)(1-MeIm), and Fe(TPP)(iPrNC)(1-MeIm), where OEP = 2,3,7,8,12,13,17,18-octaethylporphyrinate, TPP = 5,10,15,20-tetraphenylporphyrinate, and 1-MeIm = 1-methylimidazole, using single-crystal X-…
Inelastic x-ray measurements of polybutadiene are reported, performed over a wide temperature range covering both the glass and the liquid phase. At each temperature, the frequency position $\ensuremath{\Omega}$ and the width $\ensuremath{\Gamma}$ of the inelastic peaks of the spectra have been obtained for different…
Summary To examine the role of reactive oxygen species (ROS) in the signal transduction that leads to hypersensitive cell death, we used a previously established system in which a xylanase from Trichoderma viride (TvX) induces an oxidative burst and cell death in a culture of tobacco cells. Diphenylene iodonium and N‐…
A classical relaxor material, PbMg1/3Nb2/3O3 (PMN), has a long history of investigations by Raman and Brillouin spectroscopies. Earlier results on Raman scattering have emphasized a predominant role of disorder and, on the whole, confirmed a model of compositional fluctuations, first suggested by Smolensky and his col…
Anions PF6− and CF3SO3− are trapped by the new radical host [(Cu-dppe)3{hat-(CN)6}]2+, which was synthesized in a one-pot reaction from a copper(I) source, hat-(CN)6, and dppe in acetone. The trapped salts have been characterized both in solution and in the solid state (see picture: A−: PF6−, CF3SO3−). hat-(CN)6=hexaa…
Alkane dehydrogenation catalyzed by the Ir(III) complexes (PCP‘)Ir(H) 2 ( 1 ) [PCP‘ = η 3 -C 6 H 3 (CH 2 PH 2 ) 2 -1,3] and CpIr(PH 3 )(H) + ( 10 ) [Cp = η 5 -C 5 H 5 ] is investigated with density functional theory (DFT). For both systems the theoretical results show that catalytic alkane dehydrogenation to alkene pr…
Macromolecular impurities present in solution have profound effects on the growth and quality of protein crystals used for x-ray structure determinations. We have imaged the three-dimensional distribution of ovotransferrin impurities in crystals of the protein hen egg white lysozyme (HEWL) using two-photon excitation…
Activation of Cdc2-cyclin B (or M phase-promoting factor (MPF)) at the prophase/metaphase transition proceeds in two steps: dephosphorylation of Cdc2 and phosphorylation of cyclin B. We here investigated the regulation of cyclin B phosphorylation using the starfish oocyte model. Cyclin B phosphorylation is not require…