Materials Literature
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High-yield single-wall carbon nanotubes (SWCNTs) have been produced in large quantity using a Y-Ni alloy composite graphite rod as anode in a dc arc discharge. Termination of the tubes was found to be the most common defect in the arc-discharge-produced SWCNTs. A comparison is made with samples produced by laser ablat…
A homologous set of alkylsilane-modified glass surfaces with chain lengths ranging from methyl to octadecyl was prepared in order to examine the influence of alkyl surface chemistry on macrophage adhesion and foreign body giant cell (FBGC) formation. Contact angle and X-ray photoelectron spectroscopy analysis confirme…
This paper treats the flow of an electrically conducting liquid in an insulating cylinder with a spatially uniform, transverse, rotating magnetic field. The frequency of the externally applied magnetic field is sufficiently low that this field penetrates throughout the liquid. Previous researchers have treated the ste…
ZnO thin films have been obtained by the sol-gel method from a Zn(OOCCH3)2 precursor on soda lime glass and silicon wafer substrates. The films, obtained by a single dipping procedure, were characterized by Fourier transform infrared (FTIR) and ultraviolet-visible (UV-vis) spectroscopies, atomic force microscopy, x-ra…
The method of multiwavelength anomalous diffraction (MAD) is having a large and ever-increasing impact in macromolecular crystallography. Synchrotron radiation is essential for the practical implementation of this concept for solving crystal structures, but the method was slow to evolve despite two decades of synchrot…
Network copolyesters were prepared from glycerol (Yg) and sebacic acid (10) with 10–90 mol % of either succinic acid (4), 1,12-dodecanedicarboxylic acid (14), 1,18-octadecanedicarboxylic acid (20), or terephthalic acid (T). Prepolymers prepared by melt-polycondensation were cast from dimethylformamide solution and pos…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Kenzo Okamoto, Masaoki Takahashi, Hideki Yamane, Hisahiko Kashihara, Hiroshi Watanabe, Toshiro Ma…
Information on water transport along the polymer/substrate interface is valuable for understanding the mechanisms and the controlling factors affecting the water-induced adhesion loss of polymer-coated metals, adhesive-bonded joints, and polymer/fiber composites subjected to aqueous environments. This paper presents d…
Transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), and magnetic force microscopy (MFM) have been employed to image the microstructure and magnetic domain in nanocrystalline melt-spun ${\mathrm{Sm}}_{2}{\mathrm{Fe}}_{15\ensuremath{-}x}{\mathrm{Cu}}_{x}{\mathrm{Si}}_{2}\mat…
Low-Energy Ion Scattering (LEIS) was employed to study the surface of unsupported and silica-supported Cu/ZnO catalysts. It was shown that, by applying isotopic enrichment ( 63 Cu and 68 Zn), the copper and zinc signals can be separated. LEIS measurements showed a considerable amount of lead on the surface of the 63 C…
When implanting any vascular prosthetic grafts, one important goal to ensure long-term patency is achieving complete endothelialization of the luminal surface, a process that has rarely been observed clinically in humans. Seeding vascular grafts with endothelial cells has been seen as an attractive approach but has no…
A high fill-factor uncooled infrared (IR) bolometer has been fabricated by using thin-film titanium resistors sandwiched in a surface-micromachined silicon oxinitride membrane (50 /spl mu/m/spl times/50 /spl mu/m). This bolometer is realized in multilevel electrothermal structures with a fill-factor over 92%. From the…
Abstract The paper defines the glass transition temperature ( T g ) of elastomers using various thermal analysis techniques (differential scanning calorimetry, DSC; derivative DSC; thermomechanical analysis, TMA; dynamic mechanical analysis, DMA; dielectric analysis, DEA; thermal stimulated current, TSC) and compares…
A novel ABn-type dendrimer/linear polymer block copolymer, i.e., poly(trimethyleneimine) dendrimer-block-(polysarcosine)64 (1), was synthesized by ring-opening polymerization of sarcosine N-carboxyanhydride initiated with the 64-NH2-terminal poly(trimethyleneimine) dendrimer as a macroinitiator. 1 has narrow molecular…
Summary Relative proportions of cellulose in the I α and I β molecular packing forms were estimated through a relationship between molecular packing and the center of gravity of a 13 C NMR signal assigned to C-4 of cellulose. An alternative method, based on generation of linear combinations of spectra of 2 samples of…
Luminescence lifetime measurements of Eu(fod) 3 solutions in carbon tetrachloride, benzene, and acetonitrile were performed at temperatures between 5 and 75 °C. Ligand to metal charge transfer involving Eu(II) formation upon 300 nm steady state irradiations of Eu(fod) 3 solutions, besides the dependence of the differe…
2,2-Dibutyl-2-stanna-1,3-dioxepane (DSDOP)-initiated copolymerizations of trimethylene carbonate (TMC) with β-D,L-butyrolactone (β-D,L-BL), δ-valerolactone (δ-VL), ε-caprolactone (ε-CL) or L-lactide (Lac) were performed in chlorobenzene at 80°C. When equimolar mixtures of TMC and a lactone were copolymerized, copolyes…
During blood coagulation, prothrombin (PT) is ultimately degraded to three fragments, thrombin, fragment 1 (F1) and fragment 2 (F2), which, collectively, contain all of the structural features of PT. One of these fragments, F1, is excreted in human urine and is the principal protein occluded into calcium oxalate (CaOx…
Polymer technology has shown good performance and has certain advantages over ceramic technology in insulators. However, it often comes with a potentially weak point, i.e., the interface between two solid insulators. In The Netherlands, a cascade of 150 kV termination breakdowns occurred several years ago. The present…
Electropolymerization of zinc-10-bipyridinium-octaethyl-porphyrinate by cyclic scanning between −0.6 and +1.6 V yields a zigzag configured polymer, which appears as swollen, vesicular bilayer on atomic force micrographs. The same procedure leads to micrometer-long wire-shaped linear polymers, if the 5,15-methine bridg…