Materials Literature
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A « critical » degree of polydispersity is postulated beyond which liquid and crystalline states merge. For a system with a triangular particle-size distribution, the disappearance of the melting transition is estimated to occur at levels of just less than 30 % polydispersity.
La structure cristalline de la katoite [Ca3Al2(SiO4 (OH)8 ; a = 12,38 Å ; Z = 8 ; groupe spatial Ia3d] a été affinée jusqu'à R = 0,024. Si on compare les résultats de cet affinement avec ceux des termes de la série Ca3Al2(SiO4)3 — Ca3Al2(OH)12 (grossulaire, plazolite, composé synthétique sans silicium), on trouve un b…
I. Micromechanics of Failure of Reinforced Plastics (A.M. Skudra). II. Strength (Failure) Theories and their Experimental Correlation (R.E. Rowlands). III. Dynamics of Composites with Cracks (G.C. Sih). IV. The Influence of Time and Temperature on the Reinforced Plastic Strength (J.V. Suvorova). V. Methods of Static T…
The effects of seawater contaminants such as ammonium and sulfide ions and trimethylamine on the corrosion behavior of copper base alloys have been studied. Sulfide contamination causes a long-term change in the surface properties of the passive film formed on these alloys in uncontaminated seawater. The kinetics of o…
Abstract
Syntheses are described for pure paraffins having 102, 150,198, 246, and 390 carbon atoms; unlike lower homologues, all but the first show interesting properties in the solid state, bridging the gap between the chain-extended and the chain-folded modes of crystallisation typical of the lower n-paraffins and the linear…
Article Lattice Parameter Variation and Thermodynamics of Dihydride Formation in the Vanadium-Rich V—Ti—Fe/H2 System* was published on January 1, 1985 in the journal Zeitschrift für Physikalische Chemie (volume 145, issue 1-2).
Cellulosic derivatives form an interesting range of polymer liquid crystals. They belong to a class of mesophases in which the polymer chain is stiff or semiflexible and is chemically homogeneous. The cellulose backbone, a single-stranded homopolymer of β-linked 1,4-anhydroglucose units, contains three hydroxy groups…
Values for the order parameters < P2 > and < P4 > from polarized Raman measurements are reported for the homologous series of nematic alkylcyanobiphenyls. With increasing chain length a change of behaviour is observed from « low » < P4 >-values to higher values corresponding to the Maier-Saupe mean-field theory. In ad…
Seven new glycosides named wilfosides D1N (7), K1N (8), M1N (9), F1N (10), W1N (11), W3N (12), and G1G (13) were isolated from Cynanchum wilfordi HEMSLEY (Asclepiadaceae), and their structures were deduced on the basis of spectral and chemical evidence. A unique feature is that 7-11 and 13, as well as wilfosides C1N (…
Permeameters are of two general types: fixed-wall and flexible-wall cells. A controversy has developed over which type of cell is best suited for measuring the hydraulic conductivity of relatively impermeable, fine-grained soils. The various types of permeameters are discussed and their relative advantages and disadva…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis by heteropoly compounds. VIII. Reduction-oxidation and catalytic properties of 12-molybdophosphoric acid and its alkali salts. The role of redox carriers in the bulkNoritaka Mizuno, Tetsuji Watanabe, and Makoto MisonoCite this: J. Phys. Chem. 1985, 89, 1, 80–85Publ…
Abstract The water transport in microparticles of poly(2‐hydroxyethyl methacrylate) crosslinked with small amounts of ethylene glycol dimethacrylate was investigated as a function of time. Dynamic swelling curves were obtained and analyzed with a simple, empirical, exponential expression, where the exponent n indicate…
Reversible disruption and re-formation of micelles is observed by following the redox reaction of the redox-active micelles formed by the bromide salt of (11-ferrocenyl)undecyltrimethylammonium having a ferrocene moiety instead of the terminal methyl proton.
The chemical components of the Chinese crude drug "Pai-Wei, " dried root of Cynanchum atratum BUNGE (Asclepiadaceae), have been studied. Five new oligoglycosides named cynatratoside-A (3), -B (4), -C (6), -D (8), and -E (9) were isolated by column chromatography and their structures were determined on the basis of che…
Reprecipitated fibrils from collagen solutions assemble into aggregates often showing a remarkable twisted structure. We first observed these aggregates in collagen gels prepared to facilitate culture of epithelial cells. We verified that these structures form in the absence of cells and correspond to a process of sel…
The treatment of wool under anhydrous (non‐swelling) conditions with potassium tert‐butoxide dissolved in tert‐butanol was studied. The aim was to confine reaction with the alkaline reagent to the outer surface of the fibre, thus preventing whole‐fibre degradation. It appears that the a/koxide specifically reacts with…
The interaction of the reduced ‘blue solutions’ of ruthenium chloride in methanol with alkali-metal carboxylates yields the air-sensitive paramagnetic complexes, Ru2(µ-O2CR)4(R = H, Me, CH2Cl, Et, or Ph), that form weakly end-co-ordinated bis adducts, Ru2(µ-O2CR)4L2[L = H2O, MeOH, tetrahydrofuran (thf), Me2CO, or MeCN…
Fourier transform infrared spectroscopy was used to study the metal oxide/silane interface. Structures of γ-aminopropyldimethylethoxysilane (γ-APDMES) coupling agent on the surface of metal oxide powders are proposed. The structures depend on the surface characteristics of the substrate. The amine group of the silane…
The exact calculation of the reflection from single domain aligned samples of helicoidal liquid crystals (SmC* or cholesterics) is performed using the 4 x 4 matrix formulation of Maxwell equations in anisotropic media. We show that the expansion, approximation up to the 1st order of Berreman and Scheffer, is not adequ…