Materials Literature
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We synthesized hexagonal diamond directly from highly oriented pyrolytic graphite (HOPG) using a femtosecond laser pulse without catalyst. A femtosecond laser pulse with wavelength of 800 nm, pulse width of 130 fs, the intensity of 2 × 10 15 W/cm 2 was irradiated onto the HOPG surface in air. Crystalline structures of…
For decades, high resolution scanning electron microscopes (SEM) have strived to offer improved performance in the high and low energy regimes. High energies have always been attractive, because they lead to sub-nanometer resolution without complex electron optics, especially when using a scanning transmission electro…
We present novel polyurethanes from renewable materials of castor oil and starch. Castor oil is transesterified with pentaerythritol in order to obtain a wide range of polyols. Yucca starch is converted into glycoside through transglycosylation reactions with ethylene glycol and glycerol. The glycosides from starch ar…
Carbon nanotubes are known as prospective material for the optoelectronics, vacuum electronics, non-linear optics and for the composite material synthesis. Boron nitride nanotubes (BNNTs) were obtained only recently. It is expected that these nanotubes possess the unique properties. BN is much more chemically inert th…
Solubilization of hydrophilic porphyrins, 2,7,12,18-tetramethyl-3,8-di(1-methoxyethyl)-13,17-di(2-oxycarbonylethyl) porphyrin disodium salt (dimegin) and N-methyl-di-D-glucose amine salt of chlorine e 6 (photoditazine), as well water-insoluble meso-tetraphenylorphyrin in the micelles of Pluronics (triblock copolymers…
An X-ray diffraction analysis of two commercial sets of niobium pentaoxide (Nb 2 O 5 ) of Nbo-Pt grade has been performed. Each set reveals the coexistence of three modifications: n -Nb 2 O 5 , α ht -Nb 2 O 5 , and L -Nb 2 O 5 . Anomalous behavior in the structural characteristics, with the occurrence of plateaus upon…
In this work, transient response characteristics obtained from different types of UHF sensors were investigated by means of laboratory experiments. Three typical UHF sensors (i.e., disc-, monopole- and spiral-type) were tested using an artificial PD source freely moved around a tank that was used to represent a small…
In this work, several thermodynamic assessments adopted widely for ZrO 2 –CaO system are reviewed and examined, the existing discrepancies are summarized, and a new assessment is carried out based on the formation enthalpy of two compounds (CaZr 4 O 9 and Ca 6 Zr 19 O 44 ) and experimental activity data concerning cub…
Uniaxial dry pressing (DP) and slip casting (SC) were used to form green bodies of nanocrystalline 8 mol% yttria‐stabilized zirconia powder processed via the glycine‐nitrate combustion method. The SC method was shown to be a more efficient, yielding more homogenous green bodies with higher green density (60% theoretic…
Electrochemomechanical strain (ECMS) under tensile stress up to 5 MPa in polypyrrole films doped with dodecylbenzene sulfonate (PPy/DBS) has been studied in aqueous LiCl electrolytes. The ECMS of about 2% showed cation-driven behavior and decreased with increasing tensile stress. At higher tensile stresses than 2 MPa,…
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…