Materials Literature
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Abstract Rotational molding is a zero shear process used to manufacture hollow plastic parts. One disadvantage of this process is long cycle times, which are significantly affected by the sintering rates of thermoplastic powder. The objective of this work was to evaluate low molecular weight additives as sintering enh…
Thin C/SiC composites were fabricated by infiltrating a woven carbon fiber fabric with a slurry of SiC powder and polymer precursor for SiC, followed by heat treatment for pyrolysis. The effects of heat treatment parameters on the crystallization of the polymer‐derived SiC, the composite microstructure, and the transv…
Six garnet crystals with compositions close to the uvarovite-grossular binary from three different localities (Saranov, Veselovsk, and Saranka, Ural Mountains, Russia) were investigated by optical methods, electron microprobe analysis, and polarized UV-VIS-IR micro-spectroscopy. Under crossed polarizers the crystals d…
Abstract Over the years, an enormous amount of experimental results have been reported on damage accumulation (e.g. void swelling) in metals and alloys irradiated under vastly different recoil energy conditions. Unfortunately, however, very little is known either experimentally or theoretically about the effect of rec…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThe Nematic Lateral Phase: A Novel Phase in Discotic Supramolecular AssembliesPaul H. J. Kouwer, Wolter F. Jager, Wim J. Mijs, and Stephen J. PickenView Author Information Delft University of Technology, Polymer Materials and Engine…
Raman spectra of as-spun fibers produced through electrospinning have shown that high S/N data can be obtained on 50-μm diameter fibers in relatively short collection times (25 s). Using this same instrumental approach, “real time” Raman spectra of the electrospinning liquid fiber jet at the origin of the jet and 1 cm…
The initial location of the stirrer in the emulsification vessel can induce the resulting emulsion type. The interpretation in terms of mixing phenomena leads to the use of the local water-to-oil ratio (WOR) concept in the formulation-composition map. The know-how associated with this phenomenology allows us to interp…
A novel 2D image analysis technique is demonstrated. Using the digitized images of articular cartilage from transmission electron microscopy (TEM), this technique performs a localized 'vector' analysis at each region that is large enough to include several or tens of collagen fibrils but small enough to provide a fine…
We have demonstrated the anisotropic molecule dopant method for synthesizing a zero-birefringence polymer that showed no orientational birefringence at any orientation degree of polymer chains. In this method, rod-like molecules such as trans -stilbene having opposite polarizability anisotropy to that of a host polyme…
PURPOSE: The purpose of this study was to evaluate the persistence of electrostatically seeded endothelial cells (ECs) lining an expanded polytetrafluorethylene (e-PTFE) graft after one week exposure to in vivo circulation in a canine femoral artery bypass model. This was accomplished by visualizing the PKH 26 (red fl…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLaPdO3: The First PdIII Oxide with the Perovskite StructureSeung-Joo Kim, Sylvain Lemaux, Gérard Demazeau, Jong-Young Kim, and Jin-Ho ChoyView Author Information Institut de Chimie de la Matière Condensée de Bordeaux, UPR.CNRS 9048 87 avenue A. Schweitzer, 33608 Pessac…
The calculated and observed vibrational spectra of a new series of perylene tetracarboxylic derivatives (PTCDs) with different alkyl lateral chain lengths (5, 10, 15, and 20 C) are reported. With the use of characteristic vibrational modes, the question about the degree of molecular organization and packing in these P…
The thermal conductivities of alkali silicate melts containing fluorides have been determined using the non-stationary hot wire method. Measurements were carried out over the temperature range 1050–1550 K on the following six samples: Li2O–2SiO2, Na2O–2SiO2, 0·7Li2O–0·6LiF–2SiO2, 0·9Na2O–0·2NaF–2SiO2, 0·7Na2O–0·6NaF–2…
The mechanisms of hot deformation in the β titanium alloy Ti–10V–2Fe–3Al have been characterised in the temperature range 650–850°C and strain rate range 0·001–100 s-1 using constant true strain rate isothermal compression tests. The β transus for this alloy is ∼790°C, below which the alloy has a fine grained duplex +…
Although highly stable toward unfolding, native ribonuclease A is known to be cleaved by unspecific proteases in the flexible loop region near Ala20. With the aim to create a protease-resistant ribonuclease A, Ala20 was substituted for Pro by site-directed mutagenesis. The resulting mutant enzyme was nearly identical…
Let \varphi be a primitive, non-periodic substitution. The tiling space \mathcal{T}_\varphi has a finite (non-zero) number of asymptotic composants. We describe the form and make use of these asymptotic composants to define a closely related substitution \varphi^* and prove that for primitive, non-periodic substitutio…
The increasing interest in the application of plasma processes on textiles is due both to the necessity of adding value to products and to develop new pollution free technologies. In fact, plasma treatments allow modification of the textile surface behaviour with a flexible process, which can impart particular propert…
The coordinatively unsaturated dinickel(II) complex [(L2)Ni2](BPh4)2 (2), where (L2)2- represents the dianionic form of the 'N4S2' ligand N,N'-bis(2-thio-3-aminomethyl-5-tert-butylbenzyl)propane-1,3-diamine), has been investigated with respect to its ability to function as a building block for the preparation of polyn…
Abstract Ultrasonic degradation of polymers is distinguished from thermal degradation by: midpoint rather than random chain scission; a lower limit of molecular weight (MW), x f , below which the polymer will not undergo midpoint scission; and possible biomodal distribution evolving with time. The molecular‐weight dis…
CeO2 nanocrystalline films were deposited on SiO2 and SiO2/Si(100) substrates by plasma enhanced-chemical vapor deposition (PE-CVD) in Ar–O2 atmospheres. Ce(dpm)4 (dpm = 2,2-6,6-tetramethyl-3,5-heptanedionate) was used as a precursor, which allows a clean conversion into CeO2 due to the presence of Ce–O bonds. The coa…