Materials Literature
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This paper presents an artificial-neural-net model for predicting yarn tensile properties. A single hidden-layer neural network trained by using the back-propagation algorithm performs a functional mapping between material properties, process variables, and the resulting yarn tensile properties. The material and proce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of the Hydrothermal Synthesis of Calcium Titanate with Reference to Other Alkaline-Earth TitanatesMalgorzata M. Lencka and Richard E. RimanCite this: Chem. Mater. 1995, 7, 1, 18–25Publication Date (Print):January 1, 1995Publication History Published online1 Ma…
this paper we present a two dimensional dynamic simulation of the fragmentation of granular materials. We establish a two - dimensional model for a deformable, breakable, granular solid by connecting unbreakable, undeformable elements with elastic beams, similar as in Refs. 12,13 . The contacts between the particles c…
Reaction of pseudo-boehmite, [Al(O)(OH)]n, with carboxylic acids (RCO2H) results in the formation of the carboxylatoalumoxanes, [Al(O)x(OH)y(O2CR)z]n where 2x + y + z = 3 and R = C1–C13. The physical properties of the alumoxanes are highly dependent on the identity of the alkyl substituents, R, and range from insolubl…
Article Changes in Cellulose Crystallinity During Kraft Pulping. Comparison of Infrared, X-ray Diffraction and Solid State NMR Results was published on January 1, 1995 in the journal Holzforschung (volume 49, issue 6).
Tetrabenzoporphyrins (TBP) of Zn, Pd, Lu, Y, Sn and Pb have been synthesized and Pd, Sn and Lu complexes characterized by 1H NMR spectroscopy. Phosphorescence at room temperature in DMF solutions was measured for Pd and Lu complexes giving quantum yields of 7.9% and 3.5% and lifetimes of 250 µs and 870 µs, respectivel…
Introduction to thermal methods. Thermogravimetry. Differential thermal analysis and differential scanning calorimetry. Thermomechanical, dynamic mechanical and associated methods. Simultaneous techniques and product analysis. Problem solving and applications of thermal methods. Appendix: Solutions to problems in Chap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational Characteristics of Ethers and Esters of p-tert-Butylcalix[5]areneDonald R. Stewart, Mariusz Krawiec, Ram P. Kashyap, William H. Watson, and C. David GutscheCite this: J. Am. Chem. Soc. 1995, 117, 2, 586–601Publication Date (Print):January 1, 1995Publication Hi…
Oxidation is the most common surface modification of polymers. This paper presents a comparison of five gas-phase surface oxidation processes: corona discharge, flame, remote air plasma, ozone, and combined UV/ozone treatments. Well-characterized biaxially oriented films of polypropylene and poly(ethylene terephthalat…
We investigated the mechanism for the inhibition of fat digestion by chitosan, and the synergistic effect of ascorbate. The important inhibition characteristics of fat digestion by chitosan from observations of the ileal contents were that it dissolved in the stomach and then changed to a gelled form, entrapping fat i…
The photoluminescence of Ce3+, Tb3+ and Sm3+, and energy transfer from Ce3+ to Tb3+, Dy3+ and Sm3+ in Mg2Y8(SiO4)6O2 are reported and discussed. The Ce3+ ion shows blue luminescence under UV excitation, and occupies simultaneously the 4f site and 6h site in the host lattice. The optimum concentrations for the 5D3 and…
The pharmaceutical utility of silk fibroin as a possible material for an oral dosage form for elderly patients was investigated. Silk fibroin gel (SFG) was prepared from its aqueous solution. The gel formation was studied as a function of adjusted pH and concentration of silk fibroin (SF). On the basis of Fourier tran…
Abstract We have used ellipsometry to measure the glass transition temperature (T g ) of ultra‐thin films of polystyrene (PS) (less than 20 nm thick) obtained by spin‐casting from solution onto silicon substrates. We find that T g in these ultra‐thin films is depressed from the bulk value in qualitative accord with ou…
Results are presented on the multisite structure of ${\mathrm{Nd}}^{3+}$ in YAG, obtained from a comparative study of melt-grown high-temperature (HT) and flux-grown (F) crystals by using optical spectroscopy in connection with x-ray data. Absorption and emission data by pumping into $^{4}$${\mathit{G}}_{5/2}$, $^{4}$…
The binding of oligopyridyl ligands to butadiyne-linked zinc porphyrin dimers, trimers and tetramers has been investigated in detail using NMR and electronic spectroscopy. Pyridine binds to zinc porphyrin monomers in CH2Cl2 solution at 300 K with binding constants of ca. 103 mol–1 dm3, while 4,4′-bipyridyl binds to th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThreitol-Strapped Manganese Porphyrins as Enantioselective Epoxidation Catalysts of Unfunctionalized OlefinsJames P. Collman, Virgil J. Lee, Cynthia J. Kellen-Yuen, Xumu Zhang, James A Ibers, and John I. BraumanCite this: J. Am. Chem. Soc. 1995, 117, 2, 692–703Publication Da…
The filling of carbon nanotubes with palladium metal crystallites is described and it is shown that when the carbon nanotube samples are opened using nitric acid, surface acid groups (CO2H and OH) are present on both the nanotubes and nanoparticles and these interact strongly with palladium ions: ultrasound pre-treatm…
Experiments are described which demonstrate that particle velocity fluctuations and hydrodynamic self-diffusivities of sedimenting non-Brownian spheres do not vary as the inner width of the vessel varies by a factor of 4.
Adhesion of cells to a biomaterial surface can be a major factor mediating its biocompatibility. In this investigation, jet impingement techniques were used to quantify strength of cellular adhesion to various material surfaces. The metals tested: HS25 (a cobalt-based alloy similar to F75), 316L stainless steel, Ti-6A…
Adsorption of O2, using either normal oxygen or 17O-enriched mixtures, on CeO2 outgassed at different temperatures has been studied by EPR and FTIR. Different signals, assigned to O2– species bonded to surface cerium ions, were observed depending on the vacuum treatment temperature Tv, a parameter that determines the…