Materials Literature
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Thin film coatings of fluorine doped tin oxide on glass were first produced in the 1940’s as part of the World War II effort. Generically known as TCO (Transparent Conductive Oxide) Coatings, the primary use was for antifogging coatings for aircraft transparencies using an electrical current to heat the glass assembly…
The oxidation of phenylacetaldehyde has been used to help identify intermediates involved in the secondary oxidation reactions of styrene. Besides the epoxidation reaction found for styrene, styrene and phenylacetaldehyde undergo the same secondary oxidation reactions on oxygen-covered Ag(111) to produce CO 2, H 2 O,…
A new unsymmetrical photochromic diarylethene 1a is synthesized, and the photochromic properties of it are also investigated. The compound exhibits good photochromism with UV/visible light irradiation. Compound 1a in polymethyl methacrylate (PMMA) film changes color upon 313-nm light irradiation from colorless to blue…
Results of crystal structure refinements and phase quantification for samples of Co-doped lanthanum chromites with nominal composition LaCr 1−x Co x O 3 , for x=0.00, 0.10, 0.20, and 0.30, prepared by combustion synthesis are presented. The resulting powders were characterized by scanning electron microscopy and X-ray…
The influence of addition of polyaniline functionalized multiwalled carbon nanotubes (PANI-MWNTs) on the positive temperature coefficient (PTC) characteristics of carbon black (CB) filled high-density polyethylene (HDPE) nanocomposite materials have been studied. Polymer nanocomposites were prepared by the combined so…
In this article, the effects of RF (radio frequency) atmospheric pressure plasma (APP), and low pressure plasma (LPP) treatment were compared on the surface of the poly(methyl methacrylate) (PMMA) plate. The APP was proved to be able to improve the surface free energy of the PMMA faster and higher than the LPP under s…
This work explores the nature of interaction and saturation of hydrogen molecules on small titanium clusters using ab initio calculations. Molecular dynamics simulations and ensuing charge density maps were used to gain insight into the key steps involved in dissociation of the hydrogen molecule on the metal clusters.…
Sm 2 + ions doped KSrPO4 were prepared by high-temperature solid-state reaction method. The samples were investigated by x-ray powder diffraction, photoluminescence excitation and emission spectra, and luminescence decay measurements. After excitation into the 4f55d1 levels, the emission of Sm2+ ions showed D05→FJ7 (J…
We systematically studied the influence of pretreatment condition on the morphology of Fe/Al 2 O 3 catalyst film and growth of millimeter-long carbon nanotube array (CNTA). The experimental results confirm that the morphology and activity of the catalyst films are very sensitive to the pretreatment condition. A unifor…
In order to accelerate the development of validated design and predictive performance models, the Army Research Laboratory, the U.S. Army Tank Automotive Research Development and Engineering Center, and the Material Center of Excellence at Johns Hopkins University have entered into a collaboration with The Ernst-Mach…
High quality zinc oxide (ZnO) nanowires were grown on n-type Si (100) using vapor-liquid-solid process. We obtained the photoluminescence spectra of ZnO nanowires based on nonlinear optical process using an ultrashort wavelength femtosecond laser as a pumping source. The spectra shows the second harmonic generation ph…
In this study, a straightforward and cost-effective method for making non-woven membranes of polyimide using as insulation materials was described. Poly (amic acid) (PAA), a precursor of polyimide, was synthesized from 4, 4'-oxydiphthalic anhydride (ODPA) and 4, 4'-oxydianiline (ODA) at room temperature for about 4h.…
Abstract Long-term crystallization and melting process of natural rubber under elongation was investigated by measuring spin-spin relaxation time T 2 by pulsed nuclear magnetic resonance (NMR). We examined the dependence of the both processes on extension ratio, crystallization temperature and crosslink density. It wa…
AlSi7Mg/SiC/70p (AlSiC) is used for heat sinks because of its good thermal conductivity combined with a low coefficient of thermal expansion (CTE). These properties are important for power electronic devices where heat sinks have to provide efficient heat transfer to a cooling device. A low CTE is essential for a good…
Magnetic susceptibility and electrophysical properties of copper-containing solid solutions with the structure of bismuth niobate, Bi 5 Nb 3 O 15 , were studied. Paramagnetic aggregates (dimers) of copper atoms are formed in the solid solutions, their fraction substantially exceeding the statistically probable value.…
Ti1-xFexO2(x = 0.00-0.13) nanoparticle samples were prepared by hydrolysis method. We investigated the effects of Fe doping on the structural and magnetic properties of the Ti1-xFexO2nanoparticle system. Scanning electron microscopy and X-ray diffraction measurements confirm that the particle size of the powder is in…
Fabrication of free-standing carbon-nanotube- (CNT) array films supported by PDMS (poly-dimethylsiloxane) matrix, which opens up the possibility to transform deliberate CNT-array architecture into flexible electronic and photonic components, is reported. Low viscosity and good wetting characteristics of uncured PDMS p…
For multielectron beam systems with a single electron source, the outside beams need to be collimated before entering the individual microcolumns. As an alternative of the traditional multibeam source design where the broad beam from the source is collimated by a single lens, the broad beam can be first split in subbe…
Abstract The electronic structure, linear, and non-linear optical properties of ferroelectric-semiconductor SbSBr are investigated in the non-polar (paraelectric) and polar (ferroelectric) phase, using the density functional methods in the generalized gradient approximation. The electronic band structure obtained show…
Abstract N ‐Maleoyl chitosan ( N ‐MC), a water‐soluble derivative of chitosan, was synthesized by N ‐carboxyacylation of chitosan and maleic anhydride. N ‐MC films were prepared by solvent casting and kept in a desiccator for different time intervals in order to obtain N ‐MC films with different degrees of cross‐linki…