Materials Literature
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Some glasses such as 21.25Sm2O3.63.75MoO3.15B2O3 (mol %) giving the formation of nonlinear optical Sm2(MoO4)3 crystals through conventional crystallization in an electric furnace and through continuous-wave Nd: yttrium aluminum garnet (YAG) laser (wavelength: 1064nm) irradiation (samarium atom heat processing) have be…
A large-area crystalline zinc aluminate nanotube array on its own nanonet was prepared by thermal replication on an anodized aluminum oxide template and through the gas-solid reaction between Zn vapor, Al2O3, and residual O2 or produced H2O. The free-standing nanotube array plus the nanonet structure, as a whole, was…
An embedded metal-wire nanograting is designed and fabricated for the first time to our knowledge. This artificial material could be used as a broadband polarizing beam splitter to reflect s-polarized light and transmit p-polarized light. An upper-cladding layer of the same material as the gratings is deposited on the…
We calculate and model the microscopic dielectric response function for quantum dots using first principle methods. We find that the response is bulklike inside the quantum dots, and the reduction of the macroscopic dielectric constants is a surface effect. We present a model for the microscopic dielectric function wh…
We have used magnetron cosputtering to grow Zn1−xCoxO magnetic dilute semiconductors. The growth has been performed on SiO2∕Si and Al2O3(0001) substrates. The Co concentration has been varied between 0.1 and 0.25 and the substrate temperature between room temperature and 600°C. X-ray diffraction analysis has shown tha…
High purity alumina ceramic and Kovar alloy were brazed by Nickel and Titanium foils stacked as Ni/Ti/Ni layer structure. Airtight joints were achieved with shear strength more than 30MPa, after brazing at 995oC for 30min. A sandwich structure was observed in solder, which means an a-Ti solid solution belt at mid part…
At present, there are a number of software packages for the quantitative estimation of the characteristics of metallographic structure. One of the problems of using these software packages, however, is determining the phase to which the microstructure components belong. This paper proposes three methods based on the p…
Photopolymerization of liquid-crystalline diacrylates is a versatile tool to make optical films for liquid-crystal display (LCD) enhancement. The constant drive towards LCD’s having an improved front-of-screen performance demands optical films with properties that can be adjusted on (sub) pixel level. Birefringent fil…
The crystal structure of a new ion-pair complex, benzyltriphenylphosphinium-bis(maleonitriledithiolato)nickel (1) ([BzTPP][Ni(mnt)2]) was determined. The anions and [BzTPP]+ cations of complex 1 stack into well-segregated columns in the solid state, and the Ni(III) ions form a one-dimensional alternating chain with Ni…
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The major lateral teeth of the chiton Acanthopleura echinata are composite structures composed of three distinct mineral zones: a posterior layer of magnetite; a thin band of lepidocrocite just anterior to this; and apatite throughout the core and anterior regions of the cusp. Biomineralization in these teeth is a mat…
The objective of our research was to measure accurate rate constants for the thermal, unimolecular decomposition of organic nitrates. Our research confirms that the rate-determining step is homolytic cleavage of the weak O−N bond to form alkoxy radical and NO 2, but the rate constants reported in the past are incorrec…
We model the frequency responses of the photoinduced absorption (PA) and the spin-$1∕2$ photoluminescence-detected magnetic resonance (PLDMR) in the archetypal $\ensuremath{\pi}$-conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]. We show that the frequency response of the resonance is consis…
pT = propeller thrust [N] r = propeller section radius [m] T = driv er PWM period [sec] L = vehicle aerodynamic lift [N] m V = motor terminal voltage [V] p L = propeller section lift [N] s V = battery terminal voltage [V] D = vehicle aerodynamic drag [N] i V = ith Fourier series coefficient for V [V] p D = propeller s…
This paper reports on a systematic investigation of nitrogen (N) doping in single-crystalline TiO2 films possessing an anatase phase. TiO2 films heavily doped with N were grown with high crystallinity by employing a pulsed laser ablation technique using a close lattice-matched LaAlO3 (100) substrate and NO as the sour…
We report on the structural analysis of ferromagnetic Mn-doped ZnO thin films deposited by radio frequency magnetron sputtering, using transmission electron microscopy (TEM), high-resolution x-ray diffraction, and Rutherford backscattering spectroscopy (RBS) measurements. The ferromagnetic Mn-doped ZnO film showed mag…
We have introduced both electrophoretic and dynamic light scattering to evaluate the polydispersity, nanodispersity, and stability of single-walled carbon nanotubes (SWNTs) in distilled water with surfactants. By controlling the sodium dodecyl sulfate composition and some pretreatment by sonication, we were able to ac…
Triple-layer omnidirectional reflectors (ODRs) consisting of a semiconductor, a quarter-wavelength transparent dielectric layer, and a metal have high reflectivities for all angles of incidence. Internal ODRs (ambient material's refractive index n >> 1.0) are demonstrated that incorporate nanoporous SiO2, a low-refrac…
We present the use of an oblique angle physical vapor deposition (OAPVD) technique with substrate rotation to obtain conformal thin films with enhanced step coverage on patterned surfaces. We report the results of ruthenium (Ru) films sputter deposited on trench structures with aspect ratio ∼2 and show that OAPVD with…
ZnO single-crystalline nanowire-type nanostructures were synthesized on silicon by thermal chemical vapor deposition without catalysts through a two-step pressure-controlled vapor-reflected process at a low temperature of 550 °C where self-organized hexagonal crystalline or porous nanowire arrays were grown on nanorod…