Materials Literature
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The complex anion obtained by crystallisation from an aqueous solution of molybdate and citric acid (H3cit) at pH ca. 3 is of the type (i), [(MoO2)4O3(cit)2]4−, as determined by X-ray analysis of the salt K4[Mo4O11(cit)2]·6H2O. Principal dimensions [ranges or means; estimated standard deviation (e.s.d.) 0.005 Å] are:…
High-surface-area amorphous Al2O3–AlPO4 samples (P/Al ratio: 0–0.17) have been prepared by reductive decomposition of aluminium nitrate in the presence of phosphoric acid. The materials obtained are amorphous up to 1100–1200 K and present “zeolitic-type” monomodal microporosity (r= 10–15 Å). They are weakly acidic. Th…
Reaction of MCl5(M = Nb or Ta) with p-butylcalix[4]arene, L-(OH)4, led, depending on the reaction conditions, either to mononuclear complexes [(AcO)–L–(O)3MCl2], or, in the case of niobium only, to the tetranuclear complex [{µ-L-(O)4}2Nb4O2Cl8], characterized by X-ray analysis.
Abstract
The corrosion rate of Nd-Fe-B magnets is found to vary with O, C, and N contents. The corrosion rate rapidly decreases with increasing oxygen content and reaches the minimum when the oxygen content is between 0.6 and 1.2%. The corrosion rate rapidly decreases as the carbon content increases up to about 0.06% and then…
Abstract A new laboratory plant for batch cooling crystallization is described, which allows to maintain the supersaturation at a constant level during an experimental run. A method for continuous supersaturation measurements has been developed, using a density meter and a hydrocyclone. Experimental results obtained f…
Traditionally, laboratory study of phytoplankton ecology and physiology has been performed in batch cultures. Such cultures are also commonly used when phytoplankton are needed as a food supply for herbivores in an experimental or aquaculture setting. The great advantage of batch culture is its simplicity; however, in…
We discuss the viscosity and the specific heat of glass forming systems near their glass transition in the framework of usual scaling theory at a second order transition. We define this transition through the Kauzmann paradox : i.e. we assume that all the entropy difference between the same crystal and the liquid phas…
The L-azetidine-2-carboxylic acid (Aze) residue can be incorporated into proteins in the place of L-proline, of which it is the lower homologue. This substitution alters the properties of proteins, especially of collagen. Conformational constraints in N-acetyl-Aze-N'-methylamide and in several dipeptides containing Az…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomeric surfactants for surface modification of polymersMaria Torstensson, Bengt Ranby, and Anders HultCite this: Macromolecules 1990, 23, 1, 126–132Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990https:…
Acrylic Fibers Cellulose Esters, Organic Fibers Composites, Fabrications Cotton Dyeing Fabrics, Coated Fibers Fibers, Elastomeric Fibers, Engineering Fibers, Manufacture Fibers, Vegetable Flammability Identification, Fibers Keratin Leatherlike Materials Nonwoven Fabrics Olefin Fibers Polyamides, Fibers Polyesters, Fib…
Compounds [Bi(OBut)3]∞ and [Bi2(µ2-OC2H4OMe)4(OC2H4OMe)2]∞ have been obtained by metathesis reactions between bismuth halides and the appropriate alkali alkoxides; X-ray structure analysis shows a one-dimensional extended ‘skew’ chain structure based on dimeric asymmetric Bi2(OC2H4OMe)6 units in which the metal displa…
Abstract The performance of phthalic anhydride used as a coupling agent in wood fiber‐filled polystyrene composites have been verified by evaluating the mechanical properties of the composites materials. Generally, mechanical properties improved along with the increase in concentrations of the coupling agent as well a…
We derive some exact results for the statics of solitary defects (« hairpins ») in the conformations of nematic main chain worm-like polymer liquid crystals in which there is both a bending and a nematic contribution to the potential energy. It is shown that for a polymer of finite length in mechanical equilibrium the…
A debonding-stretching model is proposed in this work to analyse the effects of interfacial debonding on the ductile particle toughening of ceramics. Perfect bonding imposes lateral constraints on the particles thus prohibiting the full utilization of the particle's inherent ductility. In contrast, partial debonding i…
Characterization of Polymers. Chemical Analysis. Chromatography. Dielectric Relaxation. Dilatometry. Electron Diffraction. Electron Microscopy. Electron-Spin Resonance. Electrophoresis. Forensic Aspects. Fractionation. Identification. Impact Resistance. Infrared- Absorption Spectroscopy. Light Microscopy. Mass Spectro…
We present a new experimental approach to investigate polymer adsorption onto dielectric surfaces. This technique, internal reflection interferometry, employs multiple total internal reflections through a prism to measure the average refractive index and thickness of adsorbed layers. The adsorption kinetics of poly(et…
Crosslinking density in demineralized bone matrix collagen was found to depend on the beta-aminopropionitrile (BAPN) dose level for compact bone from rabbit femurs. The dependence was demonstrated for the hydroxypyridinium (HP) concentration, a mature crosslink. A more consistent dependence on BAPN dosage was observed…
The measurement of IR spectra of CO adsorbed on H2-reduced Ru/TiO2(1% Ru, Degussa P-25 TiO2) is made difficult by the very low transparency, caused by partial reduction of the support; reduction at 758 K leads to complete opacity, but spectra can be obtained by multiple scanning on a slightly oxidised sample (transpar…
Abstract not Available.