Materials Literature
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Resist freezing is routinely used in lithography applications to facilitate double patterning and the directed self-assembly (DSA) of block copolymers. Previous reports of graphoepitaxy within patterned positive-tone resists used chemical freezing agents which are known to cause significant shrinkage of critical dimen…
We propose and demonstrate a graphene-based device achieving extraordinary control of terahertz (THz) wave reflectance. The advantages of graphene based switchable THz devices include low cost, facile fabrication and excellent tunability, thus promising for THz system applications.
The effect of a modifying additive (brown-coal pyrolysis tar) on the asphalt oxidation process has been investigated. The dependences of the softening temperature and the dynamic viscosity of the product asphalts upon the duration of oxidation and the amount of the additive have been determined, and the oxidation rate…
High strength nonwoven fabric in the form of unidirectional structure are being used in ballistic protection applications due to their light weight and flexibility. In this study, natural rubber latex (NRL) was used as a coating material on unidirectional fabrics. It was found that the mechanical properties of the NRL…
Ba(Zr x Ti 1- x )O 3 (BZT) thin films with different Zr contents were deposited on (100) MgO and (100) Pt/(100) MgO substrates by RF-magnetron reactive sputtering using metal targets. The BZT (0 < x < 0.89) thin films had a single perovskite phase with only (001)/(100) orientation. In all cases, the ratio of Ba/…
The valences of manganese and vanadium oxides in multi-layer ceramic capacitors (MLCCs), sintered under a reducing atmosphere, were investigated using electron paramagnetic resonance; insulation resistance degradation was analyzed using impedance spectroscopy in highly accelerated lifetime tests to clarify the influen…
Dense Ba0.4Sr0.6TiO3-Mg2TiO4 composite ceramics with different grain sizes were prepared by three different sintering methods: spark plasma sintering, two-step sintering, and conventional sintering, respectively. The dielectric response, tunability, and loss properties of composite ceramics as a function of volume fra…
Stearyl heptanoate is an ester of stearyl alcohol and heptanoic acid that functions in cosmetics as a skin conditioning agent and is in the general class of chemicals called stearyl alkanoates. Stearyl caprylate, stearyl palmitate, stearyl stearate, stearyl behenate, and stearyl olivate are stearyl alkanoates with sim…
Polymer composites based on polyimide and hyperbranched polyorganosiloxanes have been irradiated by oxygen plasma imitating exposure to atomic oxygen in low near-earth orbits. It is demonstrated that the irradiation of composites gives rise to the generation of silicon dioxide particles distributed over the volume of…
Carbon nanotubes have been successfully grown using thermal chemical vapor deposition method. The bio-hydrocarbon precursor namely palm oil was used as a carbon source. The CNT were grown at various growth temperatures of 600, 700, 800 and 900°C. The growth process took 15 min followed by 10 min annealing time. The CN…
This paper presents a study on the development of a methodology to automatically determine yarn mass parameters using Image Processing (IP) techniques. The sample images were analyzed and processed through a custom made application developed in LabVIEW from National Instruments using IMAQ Vision Toolkit. The results s…
In this work, we propose an integration approach for double gate graphene field effect transistors. The approach includes a number of process steps that are key for microelectronics integration: bottom gates with ultra-thin (2nm) high-quality thermally grown SiO2dielectrics, shallow trench isolation between devices an…
This contribution deals with the numerical simulation of dislocation dynamics, their interaction, merging and changes in the dislocation topology. The glide dislocations are represented by parametrically described curves moving in slip planes. The simulation model is based on the numerical solution of the dislocation…
In this research, cadmium selenide quantum dots (CdSe QDs) are synthesized successfully in the absence of trioctylphosphine (TOP) for 46 minutes and characterized by TEM and XRD analysis. The TEM image reveals that the CdSe QDs are spherical, compact with a dense stucture. The ripening behaviour of CdSe QDs is monitor…
We examined the composition and orientation dependences of the piezoelectric properties by combinatorial sputtering. PbTiO 3 and PbZrO 3 were simultaneously sputtered to prepare composition gradient Pb(Zr,Ti)O 3 (PZT) films on Pt/Ti/Si substrates, and an almost linear composition gradient was observed in a range of Zr…
A model of coexistence states near the morphotropic phase boundary (MPB) in perovskite-type ferroelectric crystals was studied using a simplified simulation based on the Landau–Ginzburg-type free energy functional. It was found that, even when no imperfection causing the random field exists, a stable phase and a metas…
A model experiment on the grain-size-related dielectric and ferroelectric properties of lead-free Li 0.04 (Na 0.50 K 0.50 ) 0.96 NbO 3 piezoelectric ceramics has been carried out. Firstly, the size classification of calcined powders was achieved by a wet-type centrifugal separation technique to obtain size-classified…
Early damage of insulation systems is indicated by the existing of partial discharge within it. It is a release of electrical charges that occur locally at some parts of insulation, which leading to completely insulation failure. A measurement is conducted to knoe its mechanism in insulation. This research deals with…
One of the critical points in the UHF partial discharge (PD) localization in power transformers is the installation position of the UHF antennas inside the transformer or on its tank. In the UHF localization method which is based on comparing the differences of the arrival times of the partial discharge electromagneti…
Disk burst accidents sometimes happen in aeroengines. To avoid tragic consequences, aeroengine casings must have sufficient containment capability. Experiments and simulations need to be conducted to study the impact, distortion, and perforation caused by disk burst and which may give important clues to potential fail…