Materials Literature
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Nanodielectrics show remarkable dielectric properties like dielectric breakdown strength, or both surprisingly low and high values for the relative permittivity. These changes compared to materials filled with conventional, microscale filler are often attributed to the high surface area of nanoparticles and their aspe…
Microstructure and mechanical properties of a new developed cold work die steel (SDC99) were investigated under solution treatment and comparison with Cr12MoV steel. The new developed high strength and high toughness cold work die steel has overcome the weakness of Cr12MoV which failed with tipping, fracture and colla…
Abstract In this work, an LCD mode with vertical alignment and in‐plane switching electrodes (VA‐IPS) is proposed to improve optical performance. This mode can control tilt angles of LC molecules via combinations of various distances of the in‐plane‐switching electrodes, and thus improve color washout. Also, a new dri…
We designed a mechanism and the accompanying sample holders to transfer between a VEECO 930 oxide molecular beam epitaxy (MBE) and a PHI Versa Probe X-ray photoemission spectroscopy (XPS) chamber within a multiple station growth, processing, and analysis system through ultrahigh vacuum (UHV). The mechanism consists of…
As argilas bentoníticas, usadas como agente viscosificante e nanocompósitos, não podem ser usadas sem um prévio tratamento orgânico para que suas superfícies se tornem hidrofóbicas e possam ser dispersas em meios orgânicos. Estas argilas depois de tratadas são chamadas de argilas organofílicas, e são geralmente obtida…
Based on conventional thermal pulse method, a space charge measuring system that can be used with applied voltage is presented in this study. Compared to the traditional thermal method for space charge and polarization profiles measurement, the thermal pulse method with applied voltage brings the advantages of easy ca…
The performance of electro-electrets (dielectric elastomers) for actuator and sensor applications relies on high relative permittivity and low elastic modulus. Recent advances in the chemical modification of silicone elastomers allow for the stable attachment of molecular dipoles to the elastomer network, which leads…
To improve the way of efficient recycling of waste Tetra Pak package, save wood materials and develope new packaging materials, this article studied on the optimum hot-pressing process and surface decoration of waste Tetra Pak/sawdust composite board. Using the orthogonal experimental method, we studied the effect of…
A strategy to obtain functional tissues engineering with desired biomechanical properties was used to develop scaffolds with morphologies mimicking the native environment to guide tissue regeneration. Non-woven scaffolds, with fibre dimensions at a nanometre scale, can mimic the physical structure of natural extracell…
Abstract Molecular metal complexes with interactions between localized spins and conduction electrons are expected to show interesting electronic and magnetic properties. We prepared magnetic molecular conductors of iron complexes with extended TTF ligands and investigated their crystal structures and electronic and m…
The diamond nanowires (DNW) films have been deposited by N2-based microwave plasma enhanced chemical vapor deposition. Hydrogen plasma treatment is carried out on these films for various treatment times which result in microstructural and chemical modification. Morphology of as-grown DNW films resemble symmetry of den…
Abstract This paper provides evidence of appreciable amounts of Zn (up to 0.52 a.p.f.u.) residing in the crystal structure of trioctahedral vermiculite; the results were obtained by a combination of experimental methods (X-ray diffraction, energy dispersive X-ray spectrometry, electron microprobe analysis and selectiv…
The adsorption behaviors of radioactive strontium and silver nuclides on the graphite surface in a high-temperature gas-cooled reactor are studied by first-principles theory using generalized gradient approximation (GGA) and local density approximation (LDA) pseudo-potentials. It turns out that Sr prefers to be absorb…
Duplex stainless steel (DSS) presents a good combination of mechanical properties and high corrosion resistance. Its microstructure is composed of two phases with different physical properties: delta ferrite and gamma austenite. The best properties of DSS for in service applications are achieved when these phases are…
The phase and magnetic transformations in a ferromagnetic alloy of the Ni-Mn-In system are studied using dilatometry, magnetometry, metallography, and scanning electron microscopy. The effect of a magnetic field of varying intensity on the martensitic transformation and magnetic transitions of the Ni 47 Mn 42 In 11 al…
The concept for a new, frequency-selective limiting filter is presented. This is accomplished by placing a phase change vanadium dioxide (VO2) film at the proper node of the filter. When the high-powered microwave signal reaches a certain threshold, the VO2undergoes a phase transition from the monoclinic “insulator st…
The heating of polyethylene terephthalate, polyamide-66, and polyamide-6 during tensile drawing at room temperature was studied theoretically and experimentally. At a low draw rate, the necking temperature was close to the temperature of the surrounding air. An increase in the rate results in the transition to the adi…
This paper addresses the design, modeling, and fabrication of a micro-thermoelectric cross-plane generator with electroplated materials. Bi2Te3is used as n-type material, while Cu is used as p-type material. Deposition of both materials on seed layers with the same electrical potential was realized by a two-layer proc…
The main goal of the study is to explore epoxy composites with a low permittivity and acceptable other properties, especially mechanical properties and dielectric strength, for electric power applications. The influence of filler surface treatment and filler content on mechanical, thermal and dielectric properties of…
The paper deals with the problem of thermal aging of PET and Glass-fibre based composites. These electro-insulating materials are used in high voltage engineering as parts of insulation systems of large rotating machines like turbo or hydro generators. These materials were subjected to accelerated thermal aging to pro…