Materials Literature
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The authors have grown epitaxial ZnO/BaTiO3 (BTO) heterostructures by pulsed laser deposition on lattice matched Nb-doped SrTiO3 substrates. Epitaxial growth of the BTO layers has been confirmed by x-ray diffraction. The electrical properties of ZnO/BTO heterostructures have been investigated by current-voltage and ca…
Modern inverter fed motors often produce short risetime, high magnitude voltage surges that may lead to partial discharge in the random wound stator windings. Detection of PD during such voltage surges can not be done with the usual PD detectors described by ASTM D1868. Instead a detector that can separate PD pulse cu…
Twelve clonal cultures of the marine pennate diatom Haslea ostrearia (Gaillon) Simonsen were used to study sexual reproduction and auxosporulation. After crossing, compatible gametangia paired girdle to girdle, with no visible surrounding mucilage. Two gametes were formed per gametangium; these were not attached to th…
Cu-related green luminescence (GL) band in n-type ZnO layers grown by molecular beam epitaxy on sapphire and a bulk ZnO sample grown by hydrothermal method have been studied with above-bandgap excitation. Annealing of the samples in air at temperatures above 600°C resulted in an increase in the concentration of CuZn a…
To assess potential health risks of nanoparticles by means of in vitro or in vivo assays and to determine dose-action curves a defined and reproducible method of particle administration is required. The interpretation of the toxicological results should be based on a comprehensive chemical-physical characterization of…
First records of diatoms from Yap, Federated States of Micronesia, are presented, including freshwater samples from an initial assessment of collections made in streams and estuaries and marine samples from nearby coral reefs during a brief survey of the Wa'ab group of islands. Thirty-eight species were documented fro…
The success of anti-cancer therapy largely relies on the development of high-efficient, low-toxic, long-circulated, and cancertargeted drug delivery systems. Currently used pharmaceutical nanocarriers, such as polymeric nanoparticles (NPs), liposomes, micelles, nanoemulsions, and many others demonstrate a variety of u…
Ag@CdS quantum dots were synthesized by a colloidal method. CdS nanoparticles stabilized by L-cysteine were doped with varying silver concentrations. Ag@CdS nanoparticles were characterized by UV-visible spectroscopy, steady-state and time-resolved fluorescence, X-ray diffraction, Fourier transform infrared resonance…
This paper provides an update of 17 micron pixel pitch uncooled microbolometer development at DRS. Since the introduction of 17 micron pitch 640x480 focal plane arrays (FPAs) in 2006, significant progress has been made in sensor performance and manufacturing processes. The FPAs are now in initial production with an FP…
Hydroxyapatite (HAp) nanocrystals with different crystal sizes were deposited by the electrophoretic deposition method on the gold surface of a quartz crystal microbalance with a dissipation probe. The nanosensors formed this way were used to elucidate the adsorption mechanism of proteins with a similar pI value. The…
Abstract Multiple melting behaviors and partial miscibility of ethylene‐vinyl acetate (EVA) copolymer/low density polyethylene (LDPE) binary blend via isothermal crystallization are investigated by differential scanning calorimetry (DSC) and wide angle X‐ray diffraction (WAXD). Crystallization temperature T (°C) is de…
We report on an experimental realization of polarization-holographic optical elements (PHOEs) for laser beam shaping. The PHOEs were written into an azobenzene polymer layer by illumination with linearly polarized, focused light with spatially varying orientation. We propose a noniterative design method for the calcul…
With the aim of improving the photonic efficiency of an organic light emitting diode (OLED) and its display duration, both the hole transport layer (HTL) and the emitting layer (EL) were prepared as nanostructured thin films. For the HTL, nanocomposite films were prepared by spin-coating a homogeneous solution of low…
Quantum dot (QD) based contrast agents are currently being developed as probes for bioimaging and as vehicles for drug delivery. The ability to detect QDs, regardless of fluorescence brightness, in cells, tissues, and organs is imperative to their development. Traditional methods used to visualize the distribution of…
This article compares the forms and properties of ZnO nanostructures grown on Si(111) and c-plane sapphire (c-Al2O3) substrates using three different growth processes: metal organic chemical vapor deposition (MOCVD), pulsed laser deposition (PLD), and physical vapor transport (PVT). A very wide range of ZnO nanostruct…
Zinc oxide (ZnO) films have been prepared on glass substrate in layer-by-layer mode using an atomic-layer deposition (ALD) technique, and a metal-semiconductor-metal structured photodetector has been fabricated on the ZnO films employing interdigital Au as metal contacts. The photodetector shows a cutoff wavelength at…
The position of the infrared absorption band near 4500 cm -1 shifts from 4520 to 4440 cm -1 as the Al content increases along the SiO 2 -NaAlSiO 2 join and closely follows the sum of the positions of the Raman bands near 900 and 3600 cm -1 . This confirms the idea that the 4500 cm -1 band is a combination band of the…
Neutron diffraction data were collected from sintered polycrystalline 0.9BiFeO3–0.1PbTiO3 at temperatures between 293 and 793 K and the crystal and magnetic structures refined by the Rietveld method. An antiferromagnetic Néel temperature of 592 K was determined from a Brillouin fit to the refined magnetic moments with…
As characteristic sizes and lengths scales continue to decrease in nanostructures, carrier scattering processes at the geometric boundaries and interfaces in nanosystems become more prevalent. These scattering events can lead to additional resistances. This paper investigates electron-boundary scattering processes by…
A biodegradable copolymer (PEG- fum), based on poly(ethylene glycol) (PEG) and fumarate ( fum) units, was synthesized and studied as a drug carrier. PEG and fum were linked together by ester bonds to confer biodegradability to the polymeric backbone in vivo. Hence, this copolymer can be used with molecular weights abo…