Materials Literature
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Unique properties concerning the Curie temperature $({T}_{C})$ of lightly doped ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ba}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ thin films $(0.05\ensuremath{\leqslant}x\ensuremath{\leqslant}0.2)$ possessing tensile strain from the substrate have been discovered. It was found that ${T}_{C…
A novel method for synthesizing ordered macroporous polymers is presented. Simply irradiating an electron beam onto colloidal polymer crystals generates regularly ordered macroporous polymers. No post-treatment is required for the formation of porous polymers. In addition, arbitrarily shaped two- and three-dimensional…
We successfully prepared a series of semi-interpenetrating polymer networks (semi-IPNs) from castor oil-based polyurethane (PU) and 20 wt % benzyl starch (BS) with different weight-average molecular weights (M(w)), coded as the PU/BS films. The M(w) values of a series of BSs were determined by size-exclusion chromatog…
We have successfully incorporated iron oxide nanoparticles into monodispersed amorphous selenium (a-Se) colloids by regulating the reaction temperature during the synthesis of a-Se. The surfaces of these a-Se colloids could be coated with conformal and smooth shells made of Pt and SiO2. The Se cores could then be remo…
The bending instability characteristics of double-walled carbon nanotubes (DWNTs) of various configurations are studied using a hybrid approach in which the deformation-induced increase of the intratube interaction energy is modeled with the bending deformation energy using the elastic theory of beams. The intertube i…
Failures in drillstring threaded connections continue to afflict the oil industry at a cost of millions of dollars per year. In an attempt to reduce these failures the industry has generally adopted the fatigue-life-enhancing technique of cold rolling the threaded connections which act as stress concentrations. Howeve…
A magnetic shape memory effect occurring in a polycrystalline antiferromagnetic Mn85.5Fe9.5Cu5.0 (at. %) alloy is reported. The results show that because of a strong coupling between the antiferromagnetic transition and the fcc→fct martensitic transformation with (101) twinning in the alloy, its martensitic transforma…
In previous studies we have investigated octapeptides backbone-cyclized by (4-amino)phenyl azobenzoic acid (APB) or (4-aminomethyl)phenylazobenzoic acid (AMPB) and containing the active-site sequence Cys-Ala-Thr-Cys-Asp from the thioredoxin reductase. The conformational and redox properties of these peptides were stro…
This paper details the reacting paths involved during the oxidation of αII-Ni(OH) 2 and βII-Ni(OH) 2 with ozone, which is compared to the oxidation process conducted in aqueous solution. The main advantage of the ozone method lies in the control of the reaction medium steps owing to the feasibility of operating in the…
The acid properties of pure and modified silica surfaces were studied by 2-phenylethylamine (PEA) desorption in a thermogravimetric (TGA) apparatus, carrying out the experiments at different heating rates (5 < beta/(degrees C.min(-1)) < 30). The samples, containing about 13 wt % alumina, titania, and zirconia, were pr…
An efficient synthetic route was developed for the mild chloroacylation of chitosan with different chloroacyl chlorides. Full N-chloroacylation was obtained with this procedure without any O-acylation, and products having lower degrees of substitution can also be produced. Organo-soluble 6-O-triphenylmethylchitosan wa…
Vertically aligned ZnO nanowires were synthesized on sapphire through vapor deposition using Au as a catalyst. In addition to the nanowires, the sample surface contained a thin wetting layer of ZnO clusters. Spatially and spectrally resolved cathodoluminescence (CL) microscopy was applied to correlate the luminescent…
The local structure of two samples of vertically well-aligned ZnO nanorods with average diameters of 13 and 37nm were studied using orientation-dependent x-ray absorption fine structure (XAFS) at the Zn K edge. The aligned ZnO nanorod samples were fabricated on sapphire (0001) substrates with a catalyst-free metalorga…
A simple and efficient way of obtaining silver nanoparticles that are dispersible both in organic and in aqueous solvents using a single capping agent is described. The silver nanoparticles are initially prepared in water in the presence of aerosol OT [sodium bis(2-ethylhexyl)-sulfosuccinate, AOT]. Thereafter, transfe…
Using density-functional theory, we have analyzed the phase behavior of a model liquid crystal confined between two parallel, planar surfaces (i.e., the so-called slit pore). As a result of confinement, a rich phase behavior arises. The complete liquid-crystal phase diagram of the confined fluid is mapped out as a fun…
We present theoretical performance estimates for nanotube optoelectronic devices under bias. Current-voltage characteristics of illuminated nanotube p-n junctions are calculated using a self-consistent nonequilibrium Green's function approach. Energy conversion rates reaching tens of percent are predicted for incident…
The formation of scales and feathers in reptiles and birds has fascinated biologists for decades. How might the developmental processes involved in the evolution of the amniote ectoderm be interpreted to shed light on the evolution of integumental appendages? An Evo-Devo approach to this question is proving essential…
Temperature profiles and catalytic performance over α-alumina-supported nickel catalysts with various Ni loadings (0.2−10 wt %) were studied during the oxidative steam reforming of methane. The catalyst bed temperature during the reaction was dependent on the Ni loading amount. From the viewpoint that the formation of…
Mesoporous solid superacid molecular sieve films have been prepared (see Figure) and used as photocatalysts. The new class of superacid possesses large surface area, uniform pore size, and accessible 3D mesoporous architecture. These are attractive properties for catalytic or photocatalytic applications.
Titania foams (see Figure) can be produced using a non-static air–liquid foaming sol–gel process where nitrogen is bubbled through a mixture of a surfactant and a sol–gel precursor. Either anatase or rutile phase mesoporous titania foams are produced upon thermal treatment. Macroscopic cell morphologies can be tuned b…