Materials Literature
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We demonstrate a novel atomic layer deposition (ALD) process to make high quality nanocrystalline titanium dioxide (TiO2) and zinc oxide (ZnO) with intermediate Al2O3 layers to limit the crystal size. The waveguide losses of TiO2/Al2O3 nanolaminates measured using the prism coupling method for both 633 nm and 1551 nm…
Organic electro-optic material based optical modulators have been fervently pursued over the past two decades. The material properties of organic materials over crystalline electro-optic materials such as LiNbO3 have yielded devices with record low drive voltages and significant promise for high frequency operation th…
Polymer–ceramic composites have been prepared by dispersing Ca4La6(SiO4)4(PO4)2O2 (CLSP) ceramic filler in high density polyethylene (HDPE) matrix through melt mixing. Scanning electron micrographs reveal the extent of filler dispersion. The dielectric properties at 1 MHz and 5 GHz have been investigated as a function…
Abstract In this work, one-dimensional heterogeneous model has been developed for an intercooled horizontal ammonia synthesis reactor (HASR) of the Khorasan petrochemical plant. The model is further extended to simulate the HASR with two quench flows. The mass balance, energy balance, and pressure drop equations have…
Using molecular dynamics and Monte Carlo simulations as well as analytical considerations, we study the arm-retraction dynamics of a three-arm star polymer in a narrow nanotube as a function of arm length, N, and tube diameter, D . The system dynamics is analyzed and compared to the bistable collective behavior of a p…
ABSTRACT The histocompatibility of polyurethane (PU) modified by superfine silk‐fibroin (SF) powder (1 : 1) with different dosage of aspirin to determine the best dosage for histocompatibility was investigated. Aspirin powder was incorporated into SF–PU (1 : 1) blend mixture at doses of 0%, 5%, or 10% (w/w). The influ…
The development of quantum cascade lasers that span mid-infrared wavelengths necessitate developing new infrared fibers capable of transmitting light in the 3 ‒ 12 micron range. The main material candidates for producing infrared fibers that cover this spectral region are polycrystalline silver halides and glassy tell…
We demonstrate a holographic image reconstructed by a FPD-based complex spatial light modulator (SLM) which is composed of a phase-only SLM and a sheet of beam combiner. A complex SLM which modulates both amplitude and phase independently is necessary for a better image quality with reducing conjugate images. The two-…
Abstract This report describes the synthesis of silver nanoparticles (AgNPs) by in situ reduction of silver nitrate with designed ethylenediaminetetraacetic acid‐tryptophan bioconjugates. Conjugation of EDTA was chosen to augment water solubility of resulting conjugate, which in turn facilitates synthesis of AgNPs in…
The Seebeck coefficient of one electron, driven thermally into a semiconductor single-electron box, is investigated theoretically. With a finite temperature difference ΔT between the source and charging island, a single electron can charge the island in equilibrium, directly generating a Seebeck effect. Seebeck coeffi…
ABSTRACT The electrochemical and sonoelectrochemical synthesis of polypyrrole (PPy) on St‐12 steel was achieved in an oxalic acid medium by using a galvanostatic method with a current density of 4 mA/cm2. Direct application of low‐frequency ultrasound led to more compact and more homogeneous surface structures for PPy…
The interaction between oxygen and samarium (Sm) on the well-ordered thin Al2O3 film grown on Ni3Al(111) has been investigated by X-ray photoelectron spectroscopy and synchrotron radiation photoemission spectroscopy. At Sm coverage higher than one monolayer, exposure of oxygen to the Sm films at room temperature leads…
In this paper, the hot stamping mold with a cooling system was designed. The forming process was investigated. The effect of contact state between the blank and the mold on the mechanical properties of the ultra high strength steel was also analyzed. The results show that the spring-back angles are greatly reduced aft…
Abstract Although the influence of gas humidity and particle size distribution on dust resistivity is well known, the impact of thermic and electric balancing periods on the measurement of dust resistivity is less familiar. The dust resistivity of quartz glass (SiO2) and Al2O3 particle layers was measured and exhibits…
The mechanism behind the improved light emission properties of semipolar and nonpolar InGaN/GaN multiple quantum wells (MQWs) conformally grown over n-GaN nanowires (NWs) was studied using variable-temperature photoluminescence and time-resolved photoluminescence (TRPL). A reduced internal polarization electric field…
The group of silanes is one of the most abundant classes of molecules used for surface modification. In most studies, silanization is made from the vapor phase or solution. Here, an easy, robust, and fast way not only to modify, but also to map, control, and predict the wetting profiles on silicon surfaces after silan…
Tetracationic porphyrins of the TMPP (meso-tetra-(4-N-methylpyridyl)porphyrin) type, metalated with Cu(II) or with Au(III), were conjugated covalently to oligonucleotides. The Cu(I)-catalyzed cycloaddition (between an azide and an ethynyl group) and the Diels-Alder cycloaddition (between a furan and a maleimide functi…
We study nano-scale ITO top transmission gratings to improve light extraction efficiency (LEE). We use the finite difference time domain (FDTD) method to measure light extraction from a device with various grating structures and layer thicknesses. We simulate our device using a twodimensional model with top triangular…
The grain growth processes of model alloys Fe–3%Si–MnS and Fe–3%Si were investigated. The MnS particles did not completely inhibit normal grain growth but drastically reduced growth velocity. Activation enthalpy (57.72 kJ mol−1) and pre‐exponential factor (7.82 × 10−9 m2 s−1) for boundary migration obtained by statist…
Optical phased arrays (OPAs) with fast response time are of great interest for various applications such as displays, free space optical communications, and lidar. Existing liquid crystal OPAs have millisecond response time and small beam steering angle. Here, we report on a novel 32×32 MEMS OPA with fast response tim…