Materials Literature
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In order to improve our understanding of the link between the cyclic deformation of single crystals and of polycrystalline materials, a study was performed on copper bicrystals. Testing under strain control within the high cycle regime was performed in isoaxial [149] (90° and 180°) twist boundaries and [149]/[001] bic…
A structural analysis of the so-called smectic Q mesophase was performed on nine different chiral compounds. Not less than four different structures were observed, and they all belong to the crystal of defects class. The defects of the liquid crystalline organization are stacked in three dimensional crystalline lattic…
A systematic study of the promoting effect of various elements on crystallization and texture of tungsten sulfide (WS2) thin films is presented. Best crystallization at relatively low annealing temperatures Ta=650–750 °C is achieved by adding sodium sulfide or nickel to the film, while the strongest texture is achieve…
[MnOEP][HCBD], a member of the metalloporphyrin family of donor-acceptor molecule-based magnets, consists of isolated ferrimagnetic chains of alternating $S=2,$ [MnOEP], and $s=1/2,$ [HCBD] units ($\mathrm{O}\mathrm{E}\mathrm{P}=\mathrm{o}\mathrm{c}\mathrm{t}\mathrm{a}\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{y}\mathrm{l}…
Two experiments are reported which demonstrate the means to stabilize the photoluminescence from an electrochemically etched (100) Si surface (porous silicon). The strong stabilizing influence of small quantities of water on a nonaqueous [2 mol/ℓ HF in methylcyanide (MeCN)] etching process and the stabilizing effect o…
The hydrothermal reaction of V2O5, CuO, 2,2′bipyridine, H3PO4, n-Bu4NOH, and H2O in the mole ratio 1.0:0.86:2.05:3.54:1.40:449 at 160°C for 46 h yields [(VO2)2(HPO4)(2,2′-bipy)2]·H2O (1). The binuclear species is constructed from two edge-sharing dioxovanadium(V) octahedra, exhibiting a {V2O4} core in the anti-coplana…
CuO/γ-Al 2 O 3 is confirmed as the most active catalyst among eight γ-Al 2 O 3 -supported single metal oxides for the destructive oxidation of (CH 3 ) 2 S 2 . To investigate the promoting effect, nine different metal oxides were separately added to CuO/γ-Al 2 O 3 . The experiments reveal MoO 3 as the most effective pr…
Whey protein isolate (WPI)-based coatings and distilled acetylated monoglyceride (AMG)-based coatings were evaluated for their ability to delay the oxidative rancidity of walnut pieces. Tocopherol (Toco) and ascorbyl palmitate (AP) were added to improve the performance of the coatings. Results indicate that, despite t…
This study was designed to evaluate the feasibility of applying locally delivered polylactic acid microspheres for drug delivery to the arterial wall. To study drug persistence, rhodamine-loaded microspheres were infused into one carotid artery of 14 rabbits and plain rhodamine solution into the other by using a porou…
The association of styrene−methyl methacrylate statistical copolymers in the selective solvent acetone (a thermodynamically good solvent for poly(methyl methacrylate and bad for polystyrene) was examined by static and dynamic light scattering methods. In dilute solutions, the dynamics was dominated by a single fast mo…
New methodology has been developed for the synthesis of so-called sapphyrins, pentapyrrolic “expanded porphyrins”. An efficient approach involving acid-catalyzed condensation of 1,19-diunsubstituted a,c-biladienes and 3,4-dialkylpyrrole-2-carbaldehydes eliminates the preparation of bipyrrolic intermediates and allows…
Different grain sizes of ferroelectric Ba 0.65 Sr 0.35 TiO 3 doped with 1.0 mol% MgO and 0.05 mol% MnO 2 were prepared to investigate the DC field dependence of dielectric characteristics. A transition broadening is observed as grain size decreases. The broadening is attributed to the variance of lattice distortion in…
Two-, three-, and even four-bond coupling constants are reported for the first time across the N →Si coordination bond in neutral, hexacoordinate silicon chelates. Two-bond coupling constants depend critically on bond angles, and three-bond couplings follow a Karplus-type correlation with dihedral angles obtained from…
Temporal relaxation of the electric field-induced polarization in single crystalline PbMg1/3Nb2/3O3 has been measured at temperatures 180 ≤ T ≤ 230 K and times up to 104 s via polarization-optically induced linear birefringence, Δn 1/2. The data are excellently described within the framework of Chamberlin's dynamicall…
Succinic anhydride groups have been introduced on the surface of and in bulk poly(ethylene) film by a mild photochemical process. These groups on the poly(ethylene) film undergo facile transformation to various functional groups such as acids, esters, or amides by reaction with water, amine compounds, or PEG, etc. The…
Employing modified sol−gel techniques, trialkoxysilanes bearing either epoxy or 1-propenyl ether functional groups can be condensed under well controlled conditions to yield a series of soluble multifunctional siloxane oligomers. The key to the success of this synthetic approach was the use of weakly acidic ion-exchan…
Abstract Opportunities exist to exploit the unique properties of carbon dioxide to process polymers for advanced applications. The diffusion of deuterated water in poly(methyl methacrylate) films swollen by carbon dioxide at 35°C over the pressure range 0 to 90 bar (corresponding density range: 0.0 to 0.66 g/cm 3 ) wa…
The genes coding for aspartate transcarbamylase (ATCase) in the deep-sea hyperthermophilic archaeon Pyrococcus abyssi were cloned by complementation of a pyrB Escherichia coli mutant. The sequence revealed the existence of a pyrBI operon, coding for a catalytic chain and a regulatory chain, as in Enterobacteriaceae. C…
The locations of the stacking faults in β-form single crystals of syndiotactic polystyrene, which were grown isothermally from a dilute solution at temperatures ranging from 150 to 210 °C, were identified in high-resolution and dark-field (DF) images taken by transmission electron microscopy. The shift or kink of the…
We describe a local linear grating model that permits estimation of the diffraction efficiency of high-numerical-aperture two-dimensional circular lenses with one-dimensional rigorous coupled-wave analysis. The model is self-consistent and is consistent with the scalar theory that results for low-numerical-aperture le…