Materials Literature
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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…
The connection between the crystallographic phase problem and the feasible set approach is explored. It is argued that solving the crystallographic phase problem is formally equivalent to a feasible set problem using a statistical operator interpretable via a log-likelihood functional, projection onto the non-convex s…
Poly(imide–silica) hybrid materials with covalent bonds were prepared by (3-aminopropyl)methyldiethoxysilane (APrMDEOS) terminated amic acid, water, and tetramethoxysilane (TMOS) via a sol–gel technique. Infrared (IR), 29Si and 13C CP/MAS nuclear magnetic resonance (NMR) spectroscopy, and thermogravimetric analysis (T…
Simultaneous piezoelectric microgravimetry and cyclic voltammetry (CV) at an electrochemical quartz microbalance have been used to monitor the growth of poly(neutral red) films on the gold and graphite electrodes during potential cycling between –0.7 V and 0.75 V (vs. SCE) in sodium phosphate buffer (pH 5.3) and NaNO3…
The dissolution rates of most primary and secondary minerals are promoted by the presence of proton‐ and complex‐forming ligands. Effects on the rates of dissolution of hornblende by naturally occurring organic acids at concentrations commonly encountered in soil solutions and surface waters was studied in a pH 4.0, 0…
ABSTRACT Average cholesterol reduction increased as β‐cyclodextrin concentration increased, regardless of other factors. The process was optimized using RSM. When β‐cyclodextrin addition was 10%, the effect of stirring speed was more noticeable than that of stirring time. When stirring speed was at 1,600 rpm, 94.2% of…
Poly(dimethylsiloxane) networks were prepared by tetrafunctionally end-linking hydroxyl-terminated chains with tetraethoxysilane (TEOS). Molecular composites were then prepared by in situ sol–gel reactions on additional TEOS swelled into the networks, resulting in the formation of reinforcing silica fillers within the…