Materials Literature
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Chopped strand glass fiber–reinforced particle-filled castor oil–based polyurethane polystyrene composites with varying weight fractions of glass fibers were investigated for morphology, tensile strength, and absorption of various chemicals. The short glass fiber fraction was varied from 1% to 16% (by wt.) of the tota…
We explore the solvation of single conjugated polymer molecules in a smectic liquid crystal using single molecule spectroscopy. We find evidence for two distinct orientations for solvation: the majority of polymers are narrowly orientated parallel to the nematic director, as expected, but, unexpectedly, a second popul…
Microporous polyurethane vascular prostheses with a 4 mm diameter and 0.3-0.4 mm wall thickness were fabricated by a spray phase inversion technique. In this study, the effect of distance between spray guns (SG) and rotating mandrel (RM), the effect of rate of rotating mandrel (RRM), and the type of nonsolvent on pore…
Polyaniline (PANI) thin films have been prepared by applying the novel neutral and ionized cluster beam deposition (NCBD and ICBD) methods and the pulsed laser deposition (PLD) technique to the PANI samples of half-oxidized emeraldine base (EB-PANI) and protoemeraldine base forms in a high-vacuum condition. Characteri…
Abstract Monodisperse branched polyurethanes containing long alkyl chains have been prepared by a new convergent synthesis. This synthesis comprises two steps, with hexamethylene diisocyanate uretdione as the starting molecule. The free isocyanate groups of this monomer are reacted with long‐chain alkanols. These diur…
Abstract A set of new aromatic poly(ether amide)s containing benzimidazole groups and ethylene oxide sequences of different lengths were synthesized and characterized. The new polymers were prepared from two benzimidazole diamines, 2‐(4‐aminophenyl)‐5‐aminobenzimidazole and 2‐(3‐aminophenyl)‐5‐aminobenzimidazole, and…
Thermally induced reduction of amorphous Fe 2 O 3 nanopowder (2–3 nm) with nanocrystalline Mg (∼20 nm) under a hydrogen atmosphere is presented as a novel route to obtain α-Fe and Fe 3 O 4 magnetic nanoparticles dispersed in a MgO matrix. The phase composition, structural and magnetic properties, size and morphology o…
Surface chromate species on Phillips catalysts are probed directly using resonant Raman spectroscopy (see figure). Under pre-resonance conditions, for the first time, the vibrational features of the CrII-active centers and their evolution upon interaction with N2 and CO are observed.
When the Fresnel–Kirchhoff (FK) diffraction integral is evaluated exactly (instead of using the Fresnel approximation), the well-known mathematical inconsistency in the FK boundary conditions leads to unacceptable results for the intensity of Poisson's spot. The Rayleigh–Sommerfeld (RS) integral has no inconsistencies…
No AccessDesigning with PlasticsJan 2006Physical Properties – Characteristic Values – Test Methods and ProceduresGunter ErhardGunter Erhardhttps://doi.org/10.3139/9783446412828.004SectionsAboutPDF ToolsAdd to FavoritesDownload CitationTrack CitationsCopy LTI LinkPDF key 'share (en)' returned an object instead of strin…
Development of models describing the processes undergone by an electron when it travels in the surface region of solids is of great importance to acquire a more complete understanding of electron spectroscopies as x-ray photoelectron spectroscopy, Auger electron spectroscopy, or reflection-electron-energy-loss spectro…
Previous experimental measurements showed that heat transfer performance of heaters submerged in a water pool is enhanced when ultrasonic vibration is applied to the pool. The increase rate in CHF values varied depending on the inclination angle of the heated surface with the maximum when horizontal and facing downwar…
In face-centered-cubic (fcc) Al, stacking fault energy (SFE) is high at ca. $150\phantom{\rule{0.3em}{0ex}}\mathrm{mJ}∕{\mathrm{m}}^{2}$, inhibiting stacking fault (SF) formation and dislocation motion. Yet Ag-rich hcp precipitates form rapidly in Al-rich fcc Al-Ag, even as the energy difference $\ensuremath{\Delta}{E…
The carbon concentration in catalytic metal particles during the initial stages of single-walled carbon nanotube (SWNT) nucleation is studied by thermodynamics modelling and molecular dynamics simulation. Highly supersaturated carbon concentrations are necessary for nucleating the initial small carbon structures (e.g.…
Goldene Gürtel: Einkristalline Gold-Nanogürtel (siehe REM-Bild) wurden durch Ultraschallbehandlung einer wässrigen Lösung von HAuCl4 in Gegenwart von α-D-Glucose als dirigierendem Reagens synthetisiert. Die Nanogürtel sind typischerweise 30 bis 50 nm breit und mehrere Mikrometer lang. Die Methode ist einfach, schnell…
Using time-resolved small angle neutron scattering, we have measured the wave-number-dependent structure factor S(q) of monodisperse nanoemulsions that aggregate and gel after we suddenly turn on a strong, short-range, slippery attraction between the droplets. At high q, peaks in S(q) appear as dense clusters of dropl…
The nature of the proteins which comprise the in vitro excretory/secretory products (ES) of the fourth-stage larva (L4) and adult Teladorsagia circumcincta are largely undefined, despite the fact that this nematode induces profound changes, in part related to parasite ES, in the cellular architecture of the glands lin…
Carbon nanotubes (CNTs) coated with MoS 2 were produced by hydrothermal reaction using Na 2 MoO 4 as the Mo source and CS(NH 2 ) 2 as the reducing agent and S source, with CNTs present. The product was characterized by high resolution transmission electron microscopy, energy-dispersive spectroscopy, Raman and x-ray di…
The effect of different conditions on the susceptibility of nitinol to localized corrosion was examined using the cyclic potentiodynamic polarization technique. Tests were performed on mechanically polished (MP) and electropolished (EP) nitinol wire in 0.9 wt % NaCl and phosphate-buffered saline (PBS). A polarization…
A series of Pd and Pt chloride complexes with pyridine (py), 2,2'-bipyridine (bpy) and 1,10-phenanthroline (phen), of general formulae trans-/cis-[M(py)2Cl2], [M(py)4]Cl2, trans-/cis-[M(py)2Cl4], [M(bpy)Cl2], [M(bpy)Cl4], [M(phen)Cl2], [M(phen)Cl4], where M = Pd, Pt, was studied by 1H, 195Pt, and 15N NMR. The 90-140 p…