Materials Literature
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The influence of the presence of static stress on the dynamic mechanical properties of polydimethylsiloxane-carbon nanotube composite is evaluated. Significant enhancement in the dynamic stiffness is observed, which can be attributed to the combined effect of nanotube nucleated strain induced crystallization, modulati…
Polycrystalline Ba0.6Sr0.4TiO3 (BST) films grown on r-plane sapphire exhibit strong variation of in-plane strain over the thickness range of 25–400nm. At a critical thickness of ∼200nm, the films are strain relieved; in thinner films, the strain is tensile, while compressive strain was observed in the 400nm film. Micr…
Gold clusters embedded in glass are expected to be hard to dissolve in the form of ions since gold is essentially a nonreactive metal. In spite of that, bleaching of Au-doped nanocomposite sol-gel glass film on a soda-lime glass substrate is demonstrated in which electric-field thermal poling is employed to effectivel…
Selective growth of vertically aligned and highly dense carbon nanotubes was achieved by using thermal chemical vapor deposition via careful selection of a thin catalyst layer and an appropriate supporting layer. It was found that carbon nanotube growth was significantly enhanced when tantalum was used as the supporti…
The solution equilibria of gamma-aminobutanehydroxamic acid (GABAha) with H+ and Cu2+ were investigated by potentiometry, titration calorimetry, spectrophotometry, NMR spectroscopy, and ESI-MS. The thermodynamic parameters of the CuII [12]metallacrown-4 obtained for GABAha were compared with those of the corresponding…
Using spin-lattice relaxation weighted stimulated-echo spectroscopy, we report evidence for a correlation of the primary and secondary relaxation times. The experiments are performed using deuteron nuclear magnetic resonance somewhat above the calorimetric glass-transition of ortho-terphenyl, D-sorbitol, and cresolpht…
We present a statistical mechanical model of aggregation in colloidal systems with DNA-mediated interactions. We obtain a general result for the two-particle binding energy in terms of the hybridization free energy DeltaG of DNA and two model-dependent properties: the average number of available DNA bridges <N> and th…
Abstract Summary: The fabrication of honeycomb‐patterned films from PEK‐C in a humid atmosphere is reported. Some governing factors, such as the concentrations of the polymer solutions, the atmosphere humidity, and the volatility of the solvents, are tested. Moreover, by using PEK‐C, PLEG, and PPO, the different mecha…
Nanostructured ceria: The optical and electrochemical properties of thermally synthesized CeO2 spindles are investigated (see figure). The obtained CeO2 nanoparticles show interesting properties for applications as new electrode materials.
In Ralstonia eutropha, the H16 phasin PhaP1 represents the major phasin that binds to the surface of polyhydroxyalkanoate (PHA) inclusions. In this study, C-terminal fusions of PhaP1 with enhanced green fluorescent protein (eGFP) and with Escherichia coli beta-galactosidase (LacZ) were expressed separately in the tria…
A multilayer film of BiFeO3∕La0.7Sr0.3MnO3∕SrTiO3 was deposited on Si substrate by pulsed laser deposition method, in which La0.7Sr0.3MnO3 was used as a bottom electrode. X-ray diffraction showed that the film was polycrystalline. From the x-ray photoelectron spectroscopy measurement, the valence number of the Fe ion…
Epitaxial magnetic tunnel junctions with electrodes of spinel-structure Fe3O4 and perovskite La0.7Sr0.3MnO3 have been fabricated and characterized. Spinel barrier layers of magnetic FeGa2O4 and nominally nonmagnetic Mg2TiO4 were used to provide a good interface with the more sensitive Fe3O4 electrode interface. Juncti…
An in-situ X-ray transmission powder diffraction study of the kinetics of the light induced alteration of realgar (As4S4) has been carried out. Data indicate that the crystalline final products of the process are pararealgar (different As4S4 polymorph) and arsenolite (As2O3). Because of the chemical unbalance the evol…
A novel homogenization technique, combining an asymptotic multiscale method with wave-field conception, is proposed for computing the quasi-static effective parameters of three-dimensional lattices of general bianisotropic composite materials. This technique is based on the decomposition of the fields into an averaged…
The formation mechanisms of two hcp $\ensuremath{\alpha}$ phase morphologies in Ti-4.5Fe-6.8Mo-1.5Al have been investigated by optical microscopy (OM), atomic force microscopy (AFM), electron probe microanalysis (EPMA) and dilatometry. At relatively high temperatures primary $\ensuremath{\alpha}$ forms predominantly o…
Nanobelts of nickel hydroxyl sulfate have been prepared on a large scale via a simple template-free hydrothermal reaction on the basis of a complex [Ni(NH(3))(6)](2+) formed with Ni(2+) and ammonia in an ethanol-water solution. The as-synthesized nanobelts were single crystals, with several tens of microns in length a…
Defective carbon nanotubes (CNTs) were cured using current-induced thermal excitation. The original straight position of a CNT with an artificially induced plastic bend was restored using an applied current of 2.4μA∕nm. That current is nearly equivalent to the current causing sublimation of CNTs. Thermal excitation cu…
Corrosión por “nido de hormigas” es un tipo específico de fallo prematuro (2-3 meses) que tiene lugar en tubos de cobre utilizados en sistemas de aire acondicionado originando la pérdida de líquido refrigerante y la consecuente contaminación ambiental. Es conocido que este tipo de ataque requiere la presencia simultán…
Hydroxylapatite (HA) nanoparticles were functionalized by depositing rare-earth-doped Y2O3 nanoparticles on the surface, and the structural evolutions of both HA and Y2O3 phases at different annealing temperatures were investigated by x-ray diffraction and transmission electron microscopy. Laser spectroscopy indicated…
Chemical messengers such as neurotransmitters play an important role in cell communication, differentiation, and survival. We have designed and synthesized a bioactive biomaterial that derived its biological activity from dopamine. The resultant biodegradable polymer, PCD, has pendent groups bearing dopamine functiona…