Materials Literature
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Annealed and not-annealed solar cells with extremely thin absorber based on ZnO-nanorod /In2S3/CuSCN structures have been compared. Significantly higher external quantum efficiencies have been recorded on annealed devices. The temperature dependent current-voltage characteristics in the dark and under illumination wer…
The state-of-the art of the different approaches available in the scientific literature for the treatment and valorization of solid wastes generated from the leather industry has been presented in this review. Tanning processes generate significant volumes of by-products and waste materials and, because of that, tanne…
Young's modulus of single-walled carbon nanotubes (SWCNTs) was calculated by a modern pseudo-potential ab initio method. Using different models for wall thickness, we found that the Young's modulus of an SWCNT varies in a wide range from 0.94 to 5.81 TPa. Here, an SWCNT's wall thickness was obtained by electronic stru…
To achieve a 1 Tb/in2system, diamond-like carbon (DLC) on head and disk have to meet the criteria of corrosion- and wear-resistance at thicknesses of less than 2 nm. This paper will assess the performance of head and disk overcoat for a 1 Tb/in2system and beyond, with focus on the influence of DLC forming technologies…
A Fresnel zone plate is designed to perform the function of a doubly-hyperbolic lens. The focusing characteristics of the zone plate and the lens are compared using both measured data and body-of-revolution finite-difference time-domain simulations. The results from this comparison are used to evaluate the use of zone…
The effect of pretreatment bias on the nucleation and growth mechanisms of the ultrananocrystalline diamond (UNCD) films on the Si substrate via bias-enhanced nucleation and bias-enhanced growth (BEN-BEG) was investigated using cross-sectional high-resolution transmission electron microscopy, chemical bonding mapping,…
Undoped and cerium (Ce)‐doped (1 and 5 mol%) antiferroelectric thin films were obtained by a sol–gel process. All lead zirconate, PbZrO 3 (denoted as PZ), films crystallized in the perovskite phase with a full [111] pseudocubic orientation and with a uniform microstructure. X‐ray photoelectron spectroscopic investigat…
This work presents a study of H complexes in Zn deficient ZnO by density functional calculations. It is found that the location of two H atoms at the Zn vacancy (VZn) is energetically more preferable than the distant H and VZn. Each of the two H atoms saturates one dangling O bond by forming an O–H bond. The resulting…
Transferrin (Tf), an iron-transporting serum glycoprotein, which binds to receptors expressed at the surface of most proliferating cells with particularly high expression on erythroblasts and cancer cells, was chosen as the ligand to develop BCNU-loaded biodegradable poly(D,L-lactic acid) nanoparticles (NPs) containin…
Abstract. The Plasma Electrolytic Saturation (PES) technique is a relatively new process, which uses a high DC voltage power supply with a related organic electrolyte. Within the phenomenological model, the mechanism of the nanocrystalline coating formation processes has been developed to clarify the controlling varia…
Physicochemical properties of magnesium potassium phosphate (MPP) matrices for conservation of highly saline high-level liquid wastes (HLW) after their solidification at room temperature were studied comprehensively. The matrices showed high chemical stability to leaching of radionuclides and other components at vario…
Observations and analyses have been conducted on the behavior of water droplets deposited on the surface of polymer insulators. As an index to characterize the repellency of water droplets on the polymer surface, the contact angle was measured for different situations. Experiments were conducted to see the behavior of…
CaCu 3 Ti 4 O 12 ceramic samples were prepared by solid state conventional route using stoichiometric amounts of CuO, TiO2, and CaCO3. Afterward the material was doped with GeO2 with concentrations up to 6% by weight and sintered at 1050 °C for 12 h. The influence of doping on the microstructure, vibrational modes, an…
The optimum conditions for the fluorination of single-walled carbon nanotubes (SWCNT) in the atmosphere of gaseous fluorine with the nanotube structure remaining intact up to a stoichiometry of CF x , x ∼ 0.5 were determined. The kinetics of fluorination was examined. The fluorinated SWCNTs were characterized by vario…
This study reviews the application of the C/SiC composites in the thermal protection systems (TPS). Special attention is put on the structure design and optimization of the C/SiC shell panel. The comparisons of several TPS show that the ceramic matrix composite (CMC) is one of the most potential materials for TPS. The…
Room temperature ferromagnetism (RT-FM) is observed in ZnO/Si thin films on implantation of 200 keV Ni2+ ions at fluences of 6×1015, 8×1015, and 2×1016 ions/cm2. RT-FM observed without any preheat or postheat treatment is studied by alternating gradient magnetometry. The average grain size, oxygen vacancies, and charg…
The mechanical and thermophysical properties of quaternary‐layered carbides, Zr 2 [Al(Si)] 4 C 5 and Zr 3 [Al(Si)] 4 C 6 have been investigated and compared with those of Zr 2 Al 3 C 4 and Zr 3 Al 3 C 5 . These four carbides are generally alike in mechanical and thermophysical properties due to their similar crystal s…
Electrospinning has recently received much attention in biomedical applications, and has shown great potential as a novel scaffold fabrication method for tissue engineering. The nano scale diameter of the fibers produced and the structure of the web resemble certain supramolecular features of extracellular matrix whic…
We have developed a procedure to measure the thermal conductivity of dielectric liquids and gases using a steady state ac hot wire method in which a thin metal wire is used as a heater and thermometer. The temperature response of the heater wire was measured in a four-probe geometry using an electronic circuit develop…
A single crystal of boron carbide obtained from a self-propagating high-temperature synthesis (SHS) product was studied by X-ray crystallography: B11.4C3.6, a = 5.594(2) Å, c = 11.977(7) Å, V = 324.6(7) Å3, space group R3m, Z = 3, ρcalcd = 2.56 g/cm3, R = 0.048. The content of carbon in the single crystal was estimate…