Materials Literature
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This paper reports a molten salt electrolytic method for the economical production of carbon nanotubes/particles. The method converts a normal graphite cathode in a bath of molten LiCl, NaCl or KCl into carbon nanotubes and other nano-particles. The cathode erosion observed after electrolysis, together with cyclic vol…
The gastrolith of the crayfish Procambarus clarkii contains a small amount of an organic matrix that is mainly chitin and proteins, together with a large amount of calcium carbonate. As the first step to understand the mechanism of calcification, we tried to characterize matrix proteins in the gastrolith. An insoluble…
The charge height values associated with PD measured during electrical tree inception and growth are processed according to the Weibull distribution. Test arrangements, based on the needle-plane electrode system, consider specimens having either a cavity at the tip or an intimate contact with insulation. It is shown t…
An overview of polyhydroxyalkanoates as biodegradable and biocompatible materials for the development of drug delivery systems is presented. Polymers currently used for medical applications are compared with polyhydroxyalkanoates. The biochemical and physical properties of polyhydroxyalkanoates, including their biosyn…
The appearances of two distinct activation energies at high and low temperatures, an anomalously high attempt frequency and a stretched-exponential time correlation function at low temperatures for oxygen-ion diffusion in yttria-stabilized zirconia (YSZ) are shown to be quantitatively consistent with the predictions o…
A commonly used buffer, 2,2-bis(hydroxymethyl)-2,2′,2″-nitrilotriethanol (Bis-Tris) coordinates lanthanide(III) ion strongly in water to form molecular species that are highly active for the hydrolysis of a phosphate diester, bis(4-nitrophenyl) phosphate.
The structure/property relationships in a series of melt-spun poly(ethylene terephthalate) (PET) fibers processed under different conditions have been investigated. The structure of the fibers was characterized using a variety of techniques, including gel permeation chromatography (GPC), differential scanning calorime…
The effect of grain size on the overall elastic and plastic properties of nanocrystalline materials has been evaluated using the elastoplastic finite element method. The tensile deformation behaviour of nanocrystalline copper (based on a unit cell model comprising 2–100 nm sized copper crystallites and 1nm wide grain…
Triple-stranded bimetallic helicates [Ln2(LC –2H)3] form in water by a strict self-assembly process and are shown to be thermodynamically very stable (log β23 > 26) and luminescent (Ln = Eu).
The thermal decomposition of acetonitrile in the temperature range 1350–1950 K is modeled with a reaction scheme containing 23 species and 43 elementary reactions. Values of {[product]t/[CH3CN]0}/t, which were reported in a previous investigation are computed with this scheme at 50 K intervals and are compared with th…
Two new 1,7-disubstituted-1,4,7,10-tetraazacyclododecane ligands, DO2P and DO2PME, and their complexes with Mg(2+), Ca(2+), Sr(2+), Mn(2+), Zn(2+) and Ln(3+) were prepared and characterized by pH potentiometry. The pH titration data showed that DO2P and DO2PME both form 1:1 M:L complexes with all divalent and trivalen…
This paper describes the refinement method of quantitative electron diffraction using the convergent beam method, with emphasis on the algorithm and experimental measurements. Two examples are given. One is the lattice parameter measurement by comparing calculated and experimental CBED pattern using correlation and im…
Multifactor surface aging of anhydride cured epoxides was studied. Three systems based on diglycidyl ether of bisphenol A (DGEBA) and cycloaliphatic epoxy were investigated. They were submitted either to a solar irradiation alone, or to a tangential ac electric field, or to both stresses in a laboratory setup or outdo…
This study was conducted to establish a simple method for evaluating the morphology of fine anisometric particles using size measurement techniques. The size distributions of mica particles and carbon fibers classified into narrower size ranges were measured by gravitational sedimentation and laser diffraction techniq…
Article An X-Ray Diffraction Study of the Crystalline to Amorphous Phase Change in Cellulose During High-Energy Dry Ball Milling was published on January 1, 1998 in the journal Holzforschung (volume 52, issue 5).
Methane elimination during thermolysis of GaMe3 with PhHNNH2 yields sequentially dimeric [Me2Ga{µ-N(H)N(H)Ph}]2, tetrameric [MeGa{µ-N(H)NPh}]4 and, ultimately, GaN; the X-ray structure of the tetramer shows a novel Ga4N8 cage.
In the present work, rubber-toughened polypropylenes (TPOs) with different properties of the rubbery phase, consisting in different degrees of rubber dispersion and different levels of rubber crystallinity, were considered. The flame-treated surfaces of these materials and their interfaces with a commonly used primer…
A correlation between the hydrophobic characteristics and accumulation of static charge on several insulating surfaces (ceramic and non-ceramic) is studied. Although numerous experimental studies on the loss and recovery of hydrophobicity on insulator surfaces have been carried out, no efforts for establishing a corre…
B6O sintered compacts were prepared by high pressure and temperature treatments of in-laboratory synthesized B6O powder. Sinterable B6O powder with grain sizes of 1.2-1.4μm was formed above 1300°C in 4 hours in a pure argon stream by a solid-liquid reaction between amorphous boron and B2O3 powders. Single phase sinter…
We present new experimental results of the backscattering coefficient (η) for C, Al, Cu, Ag and Au targets bombarded with low energy electrons (0.6-6 keV) at normal angles of incidence. The present data show a clear monotonic increase in the backscattering coefficient with increasing target atomic number for electrons…