Materials Literature
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A busca por fibras poliméricas com diâmetros na ordem de nanômetros tem sido alvo dos pesquisadores e das indústrias, sendo que essas fibras possuem diversas aplicações. Estas fibras podem ser produzidas pelo processo de eletrofiação a partir da solução polimérica. Neste trabalho, fibras de nanocompósitos de poliamida…
Seven layered C 5 N configurations constructed from hexagonal BN and graphite structures are studied using an ab initio pseudopotential density functional method. The structural and electronic properties, and pressure-induced phase transition are investigated by calculating the total energy, structural parameter, form…
Almost isotropic three-dimensional multilayered composite right/left handed metamaterial structure is proposed and designed. It is composed of conductive mesh plates and dielectric layers including dielectric resonators with high dielectric constant. Basically, the structure has uniaxial anisotropy. The polarization o…
A novel magnetically controlled Ni-plating method has been developed to improve the field-emission properties of carbon nanotubes (CNTs). The effect of the magnetic field and Ni-electroplating on CNT field-emission properties was investigated, and the results are demonstrated using scanning electron microscopy, J—E an…
A closed four-level system in atomic vapour is proposed, which is made to possess left handedness by using the technique of quantum coherence. The density matrix method is utilized in view of the rotating-wave approximation and the effect of a local field in dense gas. The numerical simulation result shows that the ne…
Abstract Ultrananocrystalline Diamond (UNCD) Films were deposited by MW-CVD from an Ar/H2/CH4 plasma. The plasma properties were measured in situ by optical emission spectroscopy and mass spectroscopy. The intensity of the C2 emission line was systematically varied as a key plasma parameter and a correlation with resu…
We study the unique properties of current-induced heat generation Q in nanostructures and its absence in macroscopic bulks. A lead-quantum dot-lead system is taken into consideration and it is found that its unique properties stem from energy quantization of the system and arise only under conditions of low temperatur…
Abstract As inhalation is the major exposure route for nanoparticles, the question if inhaled particles can overcome the respiratory epithelial barrier and hence enter the body is of great interest. Here, we adapted the for soluble substances well established Calu-3 in vitro air-blood barrier model to the use of nanop…
The structure of 3,4-diaminopyridin-1-ium dihydrogen phosphate, [C 5 H 3 (NH)(NH 2 ) 2 ] + (H 2 PO 4 ) − , is solved from conventional X-ray powder diffraction data in direct space (monoclinic unit cell with a = 16.0725(9) Å, b = 7.7301(3) Å, c = 14.6189(9) Å, β = 96.869(1)°, V = 1803.2(2) Å 3 , Z = 8, and space group…
Double modification of birch wood sawdust was performed with the aim to prepare porous carbon materials with magnetic properties.
Little is currently known about the effects of gamma-ray irradiation on oxide magnet materials. In particular, the effect of particle size on radiation susceptibility was investigated. Two commercial powders of BaFe12O19 were thoroughly characterized, then exposed to 1 MGy of gamma radiation from a 60Co source. AC sus…
We have grown crystals Na0.4Y0.6F2.2:Ho3+ (NYF:Ho3+) by the Bridgman-Stockbarger method. The optical spectra and luminescence kinetics of NYF:Ho3+ crystals have been studied. Based on the analysis of low-temperature absorption spectra, we determine the structure of the Stark splitting of holmium levels in NYF:Ho3+ cry…
Test structures for electromigration with defined grain boundary configurations can be fabricated using focused ion beam (FIB). We present a novel approach of combining epitaxial growth of Ag islands with FIB milling. Depending on the growth parameters, bi-crystalline Ag islands can be grown on Si(111) surfaces and ca…
A novel Ag/C nanocable and epoxy resin composite was obtained by compounding Ag/C nanocables and epoxy resin. The nanocable is composed of a nanowire (core) wrapped with one or more outer layers (shell). Scanning electron microscopy images proved that the nanocables consisted of a silver nanowire core and a carbon out…
Ion beam analysis of 13C and deuterium deposition in DIII-D and their removal by in-situ oxygen baking, Wampler, W R, Allen, S L, Brooks, N H, Chrobak, C P, Davis, J W, Ellis, R, Fitzpatrick, B W N, Haasz, A A, McLean, A G, Stangeby, P C, Taylor, P L, Tsui, C K
Using the specially designed ultrasonic cavitation facility enabling to measure the hydrogen permeation, the experimental evidence have been provided for hydrogen to ingress in the metal subjected to cavitation in the 3% NaCl solution under the open circuit conditions. Increase in the vibration amplitude resulted in t…
In this work, we discuss the problem of the afterburning of methane from the exhaust gases of automobile engines fueled by natural gas. In exhaust neutralizers, the PdO/Al2O3 catalyst, the main drawback of which is the reduction of its activity under the action of steam that always present in exhaust gases, is commonl…
In this paper, we make systematical investigation for the new synthesis pathway of AACH multilayered nanofiber, which has been prepared by a low-temperature solid-state reaction. The phase transformation sequence of AACH on heating is found that the precursor converts into γ-Al2O3at 700-900°C and elevated temperature…
The problem of ultra-short optical pulse behavior in a system of carbon nanotubes with an applied magnetic field parallel to the nanotube axis was considered. The electromagnetic field was explored using the Maxwell equations. The electronic system of the carbon nanotubes was a quantum system and was mechanically inve…
Abstract A permanent magnet based on ferrite for use as components of electrical generators has been fabricated by two different methods: solid–solid mixing and cooprecipitation. The conventional solid–solid mixing method uses Fe 2 O 3 and BaCO 3 as starting materials with mole ratio n=BaO:Fe 2 O 3=1: 6. The mixture i…