Materials Literature
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We report changes in the light-induced minority carrier effective lifetime τ eff of crystalline silicon caused by rapid laser heating. The top surface of n- and p-type silicon substrates with thicknesses of 520 and 150 µm coated with thermally grown SiO 2 layers were heated by a 940 nm semiconductor laser for 4 ms. τ…
The formation of nano-sized crystals of gadolinium carbonate via reaction crystallization was studied in a semi-batch crystallizer using gadolinium chloride and ammonium hydrogen carbonate as the reactants. The gadolinium carbonate crystals were formed by the aggregation of primary particles sized about 5 nm. Thereby,…
Density Polyethylene and Rice-Husk of 0.300m particle size were melt-blended together by extrusion process and the mechanical properties of the composite were investigated using ASTM D638 test method with Instron testing machine of LK10K and model-3 type. Experimental results showed that tensile strength and percentag…
The microstructure and crystallographic relationship development of spinel phase of the composite prepared by sintering of Al2O3 and Ni powders below the melting point of Ni was investigated. Spinel phase is distributed not uniformly and the outer region of sample contains Al2O3 and NiAl2O4 without Ni particles. The d…
In this paper, the nanocrystalline porous silicon (PS) films is prepared by electrochemical etching of p-type silicon wafer with different currents density (15 and 30 mA/cm2) and etching times on the formation nano-sized pore array with a dimension of around few hundreds nanometric. The films were characterized by the…
In this paper, non-woven micro-/nanofibers and wavelike micro-ribbons were produced by a low-voltage near-field electrospinning with working voltage less than 2.8 kV and spinning distance less than 8 mm. A series of experiments were carried out to explore the influence of processing variables on the formation of near-…
Reliability has been a critical issue for thermal interface materials, especially when the materials are used for high power applications. In this paper, a series of reliability tests including baking, humidity chamber, temperature cycling, power cycling, and thermal shock have been conducted. Through comparison with…
The oxidation of CO molecules bound to supported gold clusters evolves through a series of configurational changes along the potential energy surface of the total system. The possibilities of theoretical approaches and models for description of catalytic processes are analyzed, and, in particular, the vulnerability of…
In this work we give an overview about recent developments in the integration technology of CNTs. We focus on wafer level approaches with the CVD and DEP method for growing as well as depositing CNTs in a defined way. So that we present methods to manipulate CNT growth structure, growth mode as well as growth inhibiti…
Silver nanowires have been successfully prepared by the para-phenylenediamine (PPD) of silver nitrate in acidic solution. Scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD) techniques have been employed to characterize silver nanowires. A mechanism is proposed to inte…
Ab initio calculations were performed to investigate the electronic structure and the Fermi surface of the newly discovered low-temperature superconductor: fluorine-doped WO3. We find that F doping provides the transition of the insulating tungsten trioxide into a metallic-like phase WO3 − x F x , where the near-Fermi…
Abstract Thin films of CaCu 3 Ti 4 O 12 (CCTO) are successfully deposited by metal‐organic (MO)CVD on (001)SrTiO 3 substrates. An interesting approach, based on a molten multi‐component precursor source, is applied. The molten mixture consists of the Ca(hfa) 2 •tetraglyme, Ti(tmhd) 2 (O i Pr) 2 , and Cu(tmhd) 2 [Hhfa…
The Cu-40wt%Zn-1.0wt%Bi-1.0wt%Mn bismuth-brass was prepared by casting and annealing. The microstructure was investigated by scanning electron microscopy (SEM), the phase composition was analyzed by X-ray diffraction (XRD), and the properties of mechanics and cutting were tested, too. The results show that the bismuth…
Partial discharge experiment is an important method to evaluate the insulation condition of XLPE power cable system. However, the detection sensitivity of laboratory test or on-site measurement is dependent on background noise and interference. In order to extract the short-time and wide-frequency distribution partial…
The fields of application and operational capabilities of two variants of the acoustic velocimetric method are considered. The peculiarities of temporal and phase techniques of the velocimetric method with control of multilayer adhesive constructions and articles from layered plastics are shown. Factors restricting th…
The surface state of partially stabilized zirconia with nanoparticles of sizes 10–30 nm after temperature and pressure treatments was investigated by Fourier transform infrared spectroscopy, X-ray diffraction and small-angle X-ray scattering. It is shown that the synthesized nanoparticles are surface fractals and the…
The CNTs/PMMA Nanocomposite Foams Are a Kind of Novel Multifunctional Foams which Have a Potential Application for Lightweight Conductive and EMI Shielding Materials. In this Work, the CNTs/PMMA Nanocomposite Foams with Different CNTs Contents from 1wt.% to 10wt.% Were Prepared at a Temperature Range of 50-140 °C with…
Two different triple-layer guided-mode resonance (GMR) filters with photonic crystal (PC) slab structures are designed, and their main optical properties are investigated. It is shown that under normal incidence, the PC slab GMR filters exhibit narrower bandwidth, a more symmetric line shape, and larger angular tolera…
The review consists of analysis of causes, driving forces, and mechanisms of formation and shrinkage of pores within the nanoparticles with a closed geometry. Taking into account the effects analysed within the scope of quasistationary approximation, several phenomenological models are proposed to describe the solid-s…
The effects of rapid thermal annealing (RTA) ambient on photoluminescence (PL) of sputtered ZnO films are investigated. The RTA at 800°C under either oxygen (O 2 ) or argon (Ar) ambient can remarkably enhance the PL of the ZnO films due to the improved crystallinities of the ZnO films. It is somewhat unexpected that t…