Materials Literature
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Simulations are carried out to determine how polydispersity (δ) affects the potential energy surface of a colloidal system. Increases in polydispersity are shown to cause the disappearance of potential energy minima, such that energy minima corresponding to homogeneous highly ordered structures exist only for δ&lt…
Polycrystalline CVD diamond is an excellent material for advanced optical applications, especially in the IR spectral range. However, one drawback of diamond is the significant reflection loss of 29%, caused by its high refraction index n = 2.4. We fabricated subwavelength, “moth-eye” antireflective structured (ARS) s…
Mixed (Oxygen Ion and n‐Type) Conductivity and Structural Characterization of Titania‐Doped Stabilized Tetragonal Zirconia, Durán, P., Capel, F., Moure, C., González‐Elipe, A. R., Caballero, A., Bañares, M. A.
In this study polyhydroxybutyrate (PHB), produced by a methanol-utilizing bacteria, was used to prepare microspheres in the 120-200 μm size range for embolization. A solvent evaporation technique was utilized to obtain microspheres in which methylene chloride, distilled water and polyvinyl alcohol were used as the sol…
Asymmetric switching properties were measured and quantified in sol-gel derived PZT thin films. The hysteresis asymmetry is attributed to the presence of an internal bias field that has been correlated with the self-polarization during fabrication. Annealing the sample under a remanent polarization with the polarity o…
We have investigated the generation of pretilt angle for a nematic liquid crystal (NLC) alignment in cells with oblique non-polarized ultraviolet (UV) light irradiation on polyimide (PI) surfaces. It was found that monodomain alignment of the NLC is obtained with an incident angle of 70 degrees and 75 degrees on the P…
In previous investigations, vibration welding, which is suitable for the mass production of small and simple shaped parts, was adjusted to the characteristics of thermoplastic composites. However, because of the small batches in thermoplastic composites manufacturing, especially in today's aircraft industry, there is…
Epitaxial films of W-doped vanadium oxides including W–V2O3, W–VO2 and W–V2O5 were deposited on sapphire (110) by reactive magnetron sputtering of a V–W (1.6 at. % W) alloy target in a range of oxygen partial flows. The deposited films were characterized by x-ray diffraction (XRD), Rutherford backscattering spectromet…
Power‐generation experiments of solid‐oxide fuel cells with Ni/yttria‐stabilized zirconia cermet anodes were carried out by changing the water‐to‐methane ratio in the fuel. To separate the electrochemical reactions occuring on the three‐phase boundary of the anode from the steam‐reforming reactions, premixed gases cor…
Platinum is a strong candidate for an electrode material of the high dielectric capacitors in highly integrated dynamic random access memory devices. However, it is extremely difficult to etch the fine patterns of Pt due to an inherently low etch slope. This characteristic comes from the physical sputtering nature of…
The properties of electroplated copper film have been investigated as a function of annealing temperatures together with the diffusion barrier performance. Electroplated copper films on copper and tungsten seed materials were annealed from 300 to 700 °C in N2 atmosphere for grain growth study. The average grain size o…
We report the physical properties of ZnO:Ga-based films prepared by metalorganic chemical vapor deposition (MOCVD) using ultraviolet and x-ray photoemission spectroscopy (UPS and XPS). In addition, the surface characteristics of the films are modified with a series of cleaning and etching steps. The films were produce…
Poly(trimethylene phthalates or naphthalate) and copolymers are aromatic polyesters made by polycondensation of 1,3-propanediol (PDO) and terephthalic acid (PTT), isophthalic acid (PTI) or naphthalic acid (PTN) and/or with comonomers (isophthalic acid, 1,4-butanediol, etc.). This presentation describes the chemistry a…
Transitions to chaos in three-dimensional limited aspect ratio boxes, filled with an incompressible fluid and heated from below, have been examined by direct numerical simulation as the Rayleigh number is varied. Two different problems have been considered: the first is related to a domain 3.5 x 1 x 2.1 filled with wa…
Second-harmonic generation in germanosilicate glasses was encoded by coherent superposition of the 810-nm fundamental and the 405-nm second-harmonic light of a femtosecond laser. The difference spectra between the absorption spectra of the glasses before and after preparation were measured. An evident correlation betw…
X-ray reflectivity under grazing incidence conditions is a powerful technique to study thin film density, surface roughness, and the multilayer structure without destroying the samples. In this article, we, using x-ray reflectivity technique, have studied the effects of bias voltage and deposition pressure on the mass…
The evaluation method of dielectric data based on a Williams product ansatz [A. Arbe, D. Richter, J. Colmenero, and B. Farago, Phys. Rev. E 54, 3853 (1996)] is not suited to the crossover region of the dynamic glass transition. This method is insensitive to the shape, position, or even existence of at least one of the…
Oxygen permeation properties of (A'=Ca, Sr, Ba, and Mg) were investigated. The oxides with ≤ 0.2 had hexagonal structure at room temperature. The disk membranes (1.0 mm thick) made of these oxides, when cooled from high temperature, showed significant rates of oxygen permeation down to critical temperatures characteri…
A number of 5-(alkylamino)- or 5-(arylamino)-2H-pyrrolium salts 3 or 5 have been obtained by treating the 1-aza-1,3-diene hydrochlorides 2 with isocyanides R4NC in refluxing acetonitrile or chloroform for a few hours. Depending on the experimental conditions, deprotonation of these species can occur in the reaction me…
A hypothesis for fiberÂfiber interaction in planar randomly oriented concentrated fiber suspensions is proposed and tested. The idea is that at sufficiently high fiber concentrations, friction and lubrication at fiberÂfiber contact points are the dominant interaction mechanisms. A fiber pull-out technique is introdu…