Materials Literature
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The growth rate kinetics of crystallization of aluminum trihydroxide from caustic aluminate solutions of aluminum−air batteries are studied in a laboratory batch isothermal precipitator. A method using high seed charges varying from 200 to 800 kg of Al(OH) 3 per m 3 of aluminate solutions is developed for the rapid de…
ABSTRACT Rice hulls were pretreated with an alkaline (pH 11.5) solution of hydrogen peroxide (1%) and then extruded. Pretreatment of rice hulls (4% db) at 50°C for 12 hr promoted 94.4% silica reduction, caused lignin solubilization and increased water absorption index (54%) and swollen volume (44%). The effects of tem…
Starting from pheophorbide a methyl ester (5), a degradation product of chlorophyll a, routes for the preparation of 3-vinylporphyrins 6 and 9 and of an [A,C]-divinylporphyrin 16 are described. These porphyrins were obtained as a result of chemical modification of 5 on ring D and the exocyclic ring E. Diels–Alder reac…
Part II of this series reports on an experimental investigation to establish the relationship between mechanical properties of fused composites and those of the outer and fusible interlining fabrics. A set of equations is proposed to predict low stress mechanical properties of fused composites from those of the outer…
The absorption and diffusion behavior of hydrogen in iron-rich rare-earth intermetallics of the type ${\mathrm{R}}_{2}$${\mathrm{Fe}}_{17}$ (R=Y, Sm, Gd) and the resulting changes of their magnetic properties are investigated. Intermediate hydrogen concentration indicate the solid-solution character of the hydrides. F…
Owing to the dissolution of the nickel oxide cathodes of molten carbonate fuel cells (MCFCs), the deposited nickel particles result in electronic shorting between the anode and the cathode, which is a major problem for the long‐term operation of MCFCs. The correlation between the cathode design and the amount of nicke…
Black-colored soils, equivalent to the Umbrepts suborder of USDA Soil Taxonomy, are distributed at altitudes ranging from 3,000 to 4,500 m under grass vegetation in the mountainous area surrounding the Cochabamba basin of Bolivia. The soils had thick A horizons, as in the case of the Thick High-humic to Humic Andosols…
Samples of the chemical formulaCu0.5Zn0.5Fe2-xRxO4where R is a rare earth ion (R=La,Nd,Sm,Gd and Dy) and x=0 and x= 0.1 have beeninvestigated The X-ray diffraction analysis showed a single spinel phase. Thelattice constant was found to be nearly independent of the type of R ions. Thetemperature dependence of the elect…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTLattice Imaging of Electro-Optically Active Poly(nonylbithiazole) (PNBT)L. González and D. C. MartinView Author Information Macromolecular Science and Engineering Center and Department of Materials Science and Engineering, 2022 H. H…
Two kinds of 180\ifmmode^\circ\else\textdegree\fi{} domain wall structures in the tetragonal phase of ferroelectric perovskites, one of the ``Ising type'' with only one polarization component and the other of the ``Bloch type'' with two polarization components within the wall layer, have been derived from the Landau-G…
Abstract The poly-(ethylene-b-propylene) was nucleated for a study of the structure modifications as well as the improvement of the mechanical properties, particularly the impact resistance. The nucleation was accomplished by two various red pigments: a linear trans-quinacridone dye (as ß-phase nucleator) and a dimeth…
The formation of highly coherent nanocrystalline semiconductor films on polycrystalline metal substrates has important practical and theoretical implications. Electron diffraction patterns reveal that quantum dots (QDs) of CdSe grown on a gold film on a mica substrate are coherent over several micrometers in the later…
Lithium formate monohydrate (FLMH) has been studied by Raman spectroscopy and infrared transmittance. The Raman spectra have been measured in the temperature range 10 to 490 K. The low temperature Raman spectra showed a temperature dependence of the intensities of the modes observed in the Z(XX)Y polarisation with a m…
The crystallization and unusual crystalline morphologies of compatible mixtures of tetrahydrofuran−methyl methacrylate diblock copolymer with tetrahydrofuran homopolymer were studied. It is shown that the PTHF [poly(tetrahydrofuran)] block of the copolymer cocrystalizes with the PTHF homopolymer in the PTHF microphase…
For network-forming components, we develop a model of the phonon-assisted structural transition between the configurations of atoms, which allows for quantitative predictions of the liquid-glass transition. This model is based on our investigation that shows that vitreous ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ consists…
All articles of this category A pyriphorphyrinone was synthesized by cyclocondensation of tripyrrane 2 with 2,6-diformyl-3-hydroxypyridine (1b) . It was possible to identify 3b as the exclusively formed tautomer. porphyrins - cyclocondensation - tautomers
Glassy carbon has desirable properties for electron field emission such as surface inertness, electrical conductivity, and thermal stability. In addition, a uniform thick substrate with a polished surface is easily obtainable. This enables one to apply large scale integrated circuit processing for fabricating arrayed…
Clay mineralogical characteristics of volcanic ash soils in Changbaishan and Sanjiaolongwan, Jilin Province and Wudalianchi, Heilongjiang Province, Northeast China, were investigated. The clay mineral fractions of 8 Changbai-shan pedons, 1 Sanjiaolongwan pedon, and 4 Wudalianchi pedons were characterized by the predom…
This paper reviews work carried out by the authors in developing nanoporous sol-gel films as hosts for semiconductor crystallites, for applications in nonlinear integrated optics, including aspects of fabrication, characterisation and modelling. Particular attention is given to three novel techniques — optospinography…
Monte Carlo simulation is used to study the adsorption of diblock copolymers and homopolymers on bare surfaces and surfaces modified by end-grafted polymers at densities well below the brush limit. Monomer distribution profiles for the adsorbed polymer are used to compute the surface excess (Γ exc ). The competitive a…