Materials Literature
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The dynamics of soft colloidal particles in a concentrated suspension was studied by two color dynamic light scattering. The short-time diffusion coefficient, D(s)(q), revealed a weak slowing down around the peak of S(q) in contrast to the much stronger dependence observed in hard sphere systems, and the absence of an…
Oxidized, cut single-walled carbon nanotubes (SWNTs) have been reacted with lanthanide salts containing Eu, La, and Tb. These studies are aimed at developing a fundamental understanding of the coordination chemistry of metal ions and of metal ion complexes onto the surfaces of nanotubes. It has been found that the lan…
The effect of intermolecular hydrogen bonding on the crystallization kinetics and the morphology of poly(ε-caprolactone) (PCL)/4,4‘-thiodiphenol (TDP) blends with TDP content 0−20 wt % has been investigated by differential scanning calorimetry, polarizing optical microscopy, X-ray measurements, and in situ FT-IR. The…
The formation and resorption of CaCO(3) by epithelial cell layers require epithelial transport of protons. We used the anterior sternal epithelium of the terrestrial isopod Porcellio scaber as a model to study the expression pattern and immunolocalization of a V-type H(+)-ATPase during the mineralization and demineral…
The 2-haloalkanoic acid dehalogenase (HAD) family, which contains both carbon and phosphoryl transferases, is one of the largest known enzyme superfamilies. HAD members conserve an alpha,beta-core domain that frames the four-loop active-site platform. Each loop contributes one or more catalytic groups, which function…
An extended vapour–liquid–solid (VLS) growth method, which is the reaction of a mixture of nitrogen and ammonia gas over nanoscale Fe–B 'catalyst' particles at 1100 °C, has been developed. With this method, BN nanotubes of diameter about 20 nm have been prepared and well characterized by high-resolution transmission e…
The number of redox-active and inactive Mn and Co species in MeAPO-5 and MeAPO-18 (Me = Mn, Co) was measured from H 2 consumption rates during H 2 temperature-programmed reduction (H 2 -TPR), and their structure and oxidation state were probed at identical conditions by UV−visible and X-ray absorption spectroscopies.…
Correlations are established between structural, thermal, and flexibility data of crystalline, locally flexible polymers giving rise to mesomorphic phases, which can be usefully organized in two classes. While in all mesophases the chain conformation is substantially disordered, in class 1 chain packing is characteriz…
Indium tin oxide (ITO) thin films were deposited using the e-beam evaporation method on amorphous and crystalline substrates under identical conditions. The properties of the films were investigated using optical transmittance, XRD and XPS techniques. It was found that the properties of the films depend strongly on th…
We investigate numerically the low-temperature equilibration of glassy systems via nonlocal Monte Carlo methods. We reexamine several systems that have been studied previously and investigate new systems to test the performance of such methods near the putative Kauzmann temperature, T K, where the configurational entr…
To obtain a novel biodegradable cross-linker, polymerizable polyphosphate (PIOP) was synthesized by ring-opening polymerization of 2-i-propyl-2-oxo-1,3,2-dioxaphospholane with 2-(2-oxo-1,3,2-dioxaphosphoroyloxyethyl methacrylate) (OPEMA). The number averaged molecular weight of the PIOP was 1.2 x 10(4), and the number…
We report on a density functional theory calculation of the electronic structure and optical properties of gamma-Al2O3. We have made a comparison between the optical and electronic properties of th ...
ZnO thin films were deposited on (001) Si substrate by low-pressure metalorganic chemical vapour deposition. Thermal annealing was performed at 800 °C in air for an hour. The effects of annealing on the surface morphology, stoichiometric ratio, structural and optical properties of ZnO films were investigated using sca…
The cement industry is considered as one of the basic industries that plays an important role in the national economy of developing countries. Activity concentration of 238U, 232Th, and 40K in local cement types from different Egyptian factories has been measured using a shielded HPGe detector. The average values obta…
Low-spin nickel(II) complexes containing bidentate ligands with modulated nitrogen donor ability, Py(Bz)2 or MePy(Bz)2 (Py(Bz)2 = N,N-bis(benzyl)-N-[(2-pyridyl)methyl]amine, MePy(Bz)2 = N,N-bis(benzyl)-N-[(6-methyl-2-pyridyl)methyl]amine), and a beta-diketonate derivative, tBuacacH (tBuacacH = 2,2,6,6-tetramethyl-3,5-…
We report on the modulation of phase morphology, plasticization properties, and thermal stability of films of partly branched poly(l-lactide)-co-poly(epsilon-caprolactone) copolymer (PLLA-co-PCL) with additions of low molecular weight compounds, namely, triethyl citrate ester, diethyl phthalate, diepoxy polyether (pol…
We have investigated the elastic stiffness and electronic band structure of nano-laminate solid solutions, where M and and Cr, by means of the ab initio pseudopotential total energy method. The second-order elastic constants, bulk moduli and anisotropic Young's moduli are computed for the solid solutions, in which x i…
The addition of water to spider dragline silk results in fiber contraction to 50% its initial length and significant changes to the mechanical properties of the silk. This event has been termed supercontraction. A decrease in strength and increase in elasticity have been reported when the silk is in contact with water…
The wetting behavior of a series of aliphatic polyamides was examined. Polyamides and polyethylene were molded against glass to produce smooth surfaces. After cleaning, chemical composition of the surfaces was verified with X-ray photoelectron spectroscopy. Advancing and receding contact angles were measured from smal…
Cobalt oxide (CoO x ) particles within faujasite zeolites have been synthesized by a procedure comprising (i) ion-exchange of cobalt ions into the zeolite, (ii) precipitation of cobalt ions with sodium hydroxide within the supercages of the zeolite, and (iii) calcination. The materials are characterized by XRD, nitrog…