Materials Literature
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The preparation of microparticles of the biodegradable poly-DL-lactide (PLA) and polylactide-co-glycolide (PLGA) polymers using spray-drying technology was studied. Formulation parameters investigated include polymer type, polymer molecular weight, polymer concentration, and viscosity. Microparticles were characterize…
Dense, uniform, mullite coatings have been deposited by chemical vapor deposition on SiC substrates, using a AlCl3-SiCl4-CO2-H2 system. The typical coating microstructure consisted of a thin layer of nanocrystallites of γ-Al2O3 in vitreous silica at the coating-substrate interface, with columnar mullite grains over th…
Abstraet-The surface modification of high density polyethylene (HDPE) and polypropylene (PP) has been carried out by exposure to a DC glow discharge in air at different power levels of 5.28, 11, and 13 W. The surface energies of polymers exposed to glow discharge were estimated by measuring the contact angles of two t…
This short commentary presents the result of long molecular dynamics simulation calculations of the shear viscosity of liquid n-decane and n-hexadecane using the Green-Kubo integration method. The relaxation time of the stress-stress correlation function is compared with those of rotation and diffusion. The rotational…
The thermal decomposition of 3,5-diaminobenzoyl azide, to generate in situ the corresponding 3,5-diaminophenyl isocyanate, was found to give hyperbranched polyureas, whose structure was established using IR and NMR spectroscopy.
Some previously synthesized (perfluoroalkyl)alkyldimorpholinophosphates, CnF2n+1CmH2mOP(O)- [N(CH2CH2)2O]2, were found remarkably to stabilize heat sterilizable water-in-fluorocarbon reverse emulsions and to have a strong proclivity to self-aggregate into microtubular assemblies when dispersed in water. This series ha…
Experimental solubilities are reported at 25.0°C for thioxanthen-9-one dissolved in thirty-five different organic nonelectrolyte solvents containing ester-, ether-, hydroxy-, methyl- and t-butyl-functional groups. Results of these measurements are used to test the applications and limitations of expressions derived fr…
Aluminosilicate mesoporous molecular sieves (Al-MMS) prepared at room temperature using hexadecylamine as template have been subjected to template extraction prior to calcination. Extraction in ethanol alone removes only that part of the template (in neutral form) which is not associated with framework Al while the pr…
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…