Materials Literature
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Nickel and palladium nanoparticles were finely dispersed on ordered mesoporous silicon microchannels plate (MCP) by electroless plating. The structure and composition of the resulting Ni-Pd/Si MCP were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). The electrocataly…
The effect of the heating rate during the sulfurization process on the properties of Cu2ZnSnS4 (CZTS) thin film solar cells was investigated. A moderate heating rate of ~10 oC/min was found to result in a modest solar cell performance (2 %), whereas the higher heating rates resulted in worse performances. In the CZTS…
Many nanoporous metals have been applied for catalysis and show active properties. In this study, nanoporous platinum was successfully prepared from a Cu-Pt (50/50 w/w) alloy plate by electrochemical dealloying. In order to reveal their detailed structures in nanometer order, TEM observation of the surface area of the…
Iron oxide nanoparticles of different sizes (8, 5 and 3.8 nm) have been infiltrated into the pores of porous silicon matrices, offering a hybrid system with tunable magnetic properties due to the morphology of the matrix, the loading of the nanoparticles and their size. For biomedical applications a superparamagnetic…
Abstract Syntheses in acidified hydrothermal (HT) solutions (1 N H2SO4or stronger) produce monoclinic non-stoichiometric K-jarosites which contain Fe-site vacancies with long-range order. Syntheses in non-acidified HT solutions produce rhombohedral K-jarosites which contain relatively large numbers of Fe-site vacancie…
$V_2O_5/TiO_2$ 계 촉매상에서 $NH_3$ 에 의한 $NO_x$ 의 선택적환원은 310의 지구온난화지수를 갖는 $N_2O$ 의 또 다른 인위적인 배출원이 될 수 있는 것으로 보고되고 있으므로, 본 총설은 화석연료를 연소시키는 화력발전소용 상기 촉매상에서 SCR 탈질반응 동안에 $N_2O$ 생성과 관계되는 주요 변수들의 유의성을 다루고자 한다. $NH_3$ -SCR 탈질반응에서 $N_2O$ 배출은 $NH_3$ 산화반응에 더하여 반응 중에 존재하는 $NO_x$ 와 $NH_3$ 간의 부반응을 통해 일어나 이 부반응들의 정도는 SCR 촉매의 활성성분인 $V_2O…
A computational fluid dynamic (CFD) study of methanol (MeOH) to dimethyl ether (DME) process in an adiabatic fixed-bed reactor is presented. One of the methods of industrial DME production is the catalytic dehydration of MeOH. Kinetic model was derived based on Bercic rate. The parameters of this equation for a specif…
Laser-induced transverse voltage effect is investigated in c-axis tilted Bi 2 Sr 2 Co 2 O y thin films coated with a graphite layer by using three different laser sources with wavelength ranging from ultraviolet to near-infrared. Due to the transverse thermoelectric effect, voltage signals are detected when the film s…
A cell dynamics simulation is performed for a diblock-diblock copolymers mixture confined between parallel walls. Much richer morphologies are observed in the mixture than in pure diblock copolymers. Multiple novel morphological transitions occur by changing the wall-block interaction and the distance between walls (c…
Abstract Studies of ambient‐pressure and high‐pressure behavior of photoluminescence (PL) for series of InxAl1−xN layers are presented. The measured evolution of PL energy (EPL) with x is characterized by a clear decrease of EPL and exhibits a strong bowing. This dependence corresponds to the predictions of ab initio…
Tungsten disulfide (WS2) is a layered transition metal dichalcogenide with a reported band gap of 1.8 eV in bulk and 1.32-1.4 eV in its thin film form. 2D atomic layers of metal dichalcogenides have shown changes in conductivity with applied electric field. This makes them an interesting option for channel material in…
New lithium-conducting solid solutions based on lithium orthozirconate have been synthesized by mutual doping of the related structures Li8ZrO6 and Li7NbO6. The main factor determining the increase in the electrical conductivity of the Li8 − x Zr1 − x Nb x O6 solid solutions is the formation of lithium vacancies in th…
The results are presented of the investigation of fatigue crack growth in 200 × 100 × 10 mm specimens made from the upper chord of rejected solebars with boxlike cross sections. The specimens were placed in an MTS-50 electrohydraulic machine and alternately loaded with cyclic and static loads from the instant of fatig…
Slightly agglomerated, crystalline nanoparticles of ferromagnetic compounds with spinel and perovskite La1−xSrxMnO3structure have been synthesized by the sol-gel method, precipitation from glycol solutions and using microemulsion technique. “Core/shell” La1−xSrxMnO3/SiO2stucture have been developed. Magnetic propertie…
Spherical pristine LiMn2O4 and Ni doped LiNixMn2-xO4 (x=0.1, 0.2, 0.3, 0.4, 0.5) cathode materials for lithium ion battery with high first cycle discharge capacity and excellent cycle performance were synthesized using the solution-combustion technique. XRD analysis revealed peak shift towards higher angle and lattice…
In this study, the kinetics of adsorption of humic acid (HA) from aqueous solution onto a zeolitic tuff were investigated. X-ray diffraction, scanning electron microscopy, porosity and pore-size distribution measurements indicate that macromolecules can diffuse into the material. The kinetic curves show a two-stage ad…
Ammonium-containing zirconium fluoride complexes of the formula (NH 4 ) 6 MZr 4 F 23 (M = K, Rb, and Cs) were obtained and studied. The complexes crystallize in the orthorhombic system. Their unit cell parameters were determined. The IR absorption spectra of the complexes in the 350–4000 cm −1 range were recorded and…
Optically stimulated luminescence (OSL) dosimetry characteristics of topaz glass composites were studied. The purpose of this research was to find the suitability of topaz glass composites as a dosimeter using the optically stimulated luminescence technique. The pellets of topaz glass from Sabser mine, Skardu, Pakista…
Arthur Ashkin ushered in the field of optical manipulation more than 40 years ago. Today, smaller and smaller tools, such as optical “nanotweezers” and precisely focused lasers, are becoming practical for controlling single cells, individual proteins, DNA and even the behavior of worms.
In this study, some stabilized magnetite based ferrofluids were synthesized using Dextran as a stabilizing agent. In order to achieve optimum experimental conditions for synthesizing ferrofluids as MRI contrast agents, the Taguchi method was used. This approach was employed to design and minimize the number of require…