Materials Literature
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Abstract A neutron diffraction study at 20 K of a single crystal of scolecite (CaAl 2 Si 3 O 10 · 3H 2 O, a = 6.516(2), b = 18.948(3), c = 9.761(1) Å, β = 108.98(1)°; Cc , Z = 4, D c = 2.28 g/cm 3 ) utilized 2109 diffraction intensities from the Brookhaven National Laboratory High Flux Beam Reactor ( λ = 1.0505(1) Å,…
Abstract The mechanism of cellulose alkalization in isopropyl alcohol (IPA)–water–sodium hydroxide system was studied from the viewpoint of the selective distribution of sodium hydroxide between cellulose and the medium, and of the lattice transition of cellulose. A mixture of IPA, water, and sodium hydroxide spontane…
Evidence is presented to support the view that the surface of a fascicle reflects the wave pattern of its constituent collagen fibrils. The wave pattern shows considerable variation within and between fascicles. Smooth continuous phase shifts in crimp angles and crimp lengths across the width and along the length of a…
The Marshall Procedure as applied to design and control of asphalt mixtures used in the Department of Defense evolved during the period from World War II to the late 1950's. Motivation for its development came from a need for a mix design procedure to proportion aggregate and asphalt binder to sustain increasing wheel…
The Structure of a new bis-cyclotribenzyl cavitand, (2), forming an internal 1 : 1 Complex (‘cavitate’) with dichloromethane, has been determined by single X-ray crystallography.
Abstract A number of polysaccharides of the starch type, including maltodextrins and cyclodextrins and some other well‐known polysaccharides have been oxidized by periodate/chlorite (two‐step method) or hypochlorite (one‐step method), yielding ring‐opened polycarboxylates. The oxidation products from the starch type s…
Substitution of tetraphenylporphyrinatomanganese(III) complexes on the peripheral phenyl groups makes these compounds suitable as catalysts for the epoxidation of terminal olefins with mono-oxygen donors such as sodium or lithium hypochlorite and potassium hydrogen peroxomonosulphate in a biphasic system.
Single-crystal e.s.r. spectra of u.v.-irradiated octakis(methylammonium) decamolybdate(VI) dihydrate, [NH3Me]8[Mo8O26(MoO4)2]·2H2O, show the formation of two distinct localized MoVO5(OH) sites, resulting from a hydrogen-bonding proton transfer from [NH3Me]+ to a bridging oxygen atom in the anion. Analysis of the e.s.r…
Dans cet article sont donnes 150 parametres de solubilite de matieres cosmetiques ainsi que les methodes pour leur calcul et un programme d'ordinateur
Résumé. 2014 Les variations en fonction de la température des invariants du paramètre d’ordre sont mesurées dans les phases nématiques uniaxes et biaxes de différents mélanges de laurate de potassium, 1-decanol, D2O. Elles montrent que les transitions de phase nématique uniaxe-biaxe sont du second ordre et de champ mo…
The relationship between low-molar-mass or monomeric liquid crystals and polymeric liquid crystals is explored by examining the historical development of experimental and theoretical aspects of the latter materials. Polymeric liquid crystals are initially contrasted with conventional, non-mesogenic, flexible polymer c…
Aqueuous solutions of copper(I) iodide, potassium iodide, and the crown ether from unexpectedly different and novel structure: [Cu4I6][Cu8I13]K7(12-crown-4)6 with two different clusters per asymmetric, unit and polymeric modifications, [Cu4I6]K2(15-crown-5)2, and [Cu3I4]K(dibenzo-24-crown-8) depending upon identity of…
Hydrogen attack (HA) is a degradation process occurring in steel exposed to hot, high-pressure hydrogen. It is caused by the nucleation, growth, and ultimate link-up into fissures of small methane bubbles – primarily on grain boundaries. The location and growth kinetics of the submicrometre bubbles during the incubati…
Abstract In Abhängigkeit von der durch Natronlaugenbehandlung hervorgerufenen Gitterumwandlung werden Veränderungen der übermolekularen Struktur von Linters‐Cellulose durch geeignete Parameter (Kristallinitätsgrad, Ordnung und Größe der kristallinen Bereiche) charakterisiert. Die Anwendung des Verfahrens nach Ruland‐V…
I.r. bands due to dissociative adsorption of hydrogen onto ZrO2 at room temperature were observed by Fourier transform i.r. spectroscopy at 3780 and 3668 cm–1 for ZrOH and at 1562 and 1371 cm–1 for ZrH and ZrHZr, respectively.
Sericin gene expression in the middle silk glands during Bombyx mori larval development was analyzed using probes from a genomic DNA clone for 10.5 kb sericin mRNA. The 10.5 kb mRNA, the most abundant in the fifth instar, is not detected in the third feeding, fourth feeding and fourth moulting stages. It becomes detec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxo anion-supported organoactinides: the [(C5H5)3U(MW5O19)2]5- anions (M = Nb, Ta) and their thorium analogs [(C5H5)3Th(MW5O19)2]5-V. W. Day, W. G. Klemperer, and D. J. MaltbieCite this: Organometallics 1985, 4, 1, 104–111Publication Date (Print):January 1, 1985Publicati…
Based on experimental observations, a theoretical framework has been established to quantify the geometry of a three-dimensional braided fabric. Predictions of the strength of the fabric and composite were made using a geometric model.
The effect of hydrostatic pressure on the corrosion of aluminium in sea water oj pH 8·2 containing 7ppm dissolved oxygen has been investigated at 20°C. On increasing the pressure from 1 to 300 atm, the corrosion rate increased, an effect attributable to an increase in the rate of the anodic reaction while the cathodic…
Abstract It is observed that neither inspection of z values, consideration of near-neighbour coordination, nor chemical considerations show in all cases which atom occupies site 2 ( c I ) and which site 2 ( c II ) of the Cu 2 Sb tP 6 structure. Calculation of the Wirkungsbereiche by the Dirichlet construction shows in…