Materials Literature
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Manganese oxide thin films are deposited on graphite foils by a simpler one-step reactive dc sputtering dry process with different volume flow rates of oxygen, sputtering time, pressure, and power. Maximum mass specific capacitance of 344 F/g is obtained in 0.5 M LiCl as well as with optimum sputtering conditions (vol…
This paper presents the experimental study of using phase change material in the cooling of the mobile devices. It investigates the thermal performance of transient charging and discharging of mobile devices in three different situations; making phone calls frequently, making long duration calls, and making occasional…
Abstract Summary: The co‐polymerizations of D,L‐lactide and glycolide in supercritical carbon dioxide (scCO2) using zinc (II) ethylhexanoate (ZnOct2) as catalyst and methanol as initiator have been investigated. The influence of stirring rate (N), temperature (T), and mass carbon dioxide (mCO2) on molecular weight dis…
Many radioactive material shipping packages incorporate a cane fiberboard overpack for thermal insulation and impact resistance. Mechanical, thermal, and physical properties have been measured on cane fiberboard following thermal aging in various temperature/humidity environments. Several of the measured properties ch…
Hollow magnetite (Fe3O4) spheres have been synthesized successfully via a template-free hydrothermal reaction using Fe-naphthenate and LiOH as the starting materials. The average diameter of hollow magnetite spheres prepared at 120°C was about 10 µm, and the specific surface area of the product was 68.3 m2/g. The size…
The synthetic details of a novel potassium gallosilicate natrolite with Si/Ga = 1.28, denoted PST-1, are described. The presence of K(+) and Ga with well-defined levels of concentration in the synthesis mixture is essential for directing its crystallisation. PST-1 transforms rapidly into TNU-6 under hydrothermal condi…
This paper proposes a novel single-metal-layer miniaturized-element frequency selective surface (MEFSS) design and a new concept for the fulfillment of this design. In addition to the simple need for a metal layer printed on a very thin substrate, the MEFSS period can be even smaller than nine percent of the wavelengt…
A simple and effective method for the synthesis of nano-crystalline PZT spatulae has been re-ported near MPB via a new Solution-Ignition Synthesis route and has been characterized by FT-IR, XRD, TG/DTG/DTA and SEM techniques. X-ray line broadening and Scherrer formula show crystallite size to be~20 nm. Densities of na…
Hexavalent chromium-based passivation treatments have been successfully used as promoters of conversion coatings for many years. Their effectiveness is without question although there are many problems with regard to their environmental suitability. Hexavalent chromium compounds are carcinogenic and toxic. These probl…
A study about the magnetic behaviour of magnetite nanoparticles diluted in lyotropic liquid crystals was carried out. It was corroborated that micellar phases of the liquid crystal suppressed the superparamagnetism of the nanoparticles by rising the blocking temperature beyond the room temperature. Phase transitions i…
In order to improve the bone bioactivity and osteointegration of metallic implants, hydroxyapatite (HA) is often coated on their surface so that a real bond with the surrounding bone tissue can be formed. In the present study, cathodic electrophoretic deposition (EPD) has been attempted for depositing nanostructured H…
U-shaped calixsalens can be efficient building blocks for the construction of molecular boxes or cavitands. The first example of a calixsalen complex that has no coordination between the metal ion and phenolic oxygen atom was provided by X-ray. The resulting molecular structure has a high thermal stability, but comple…
We present a monitoring technique that combines broadband optical monitoring for accurate layer termination with quartz crystal monitoring ensuring the robustness of the process. Results both from sputter and electron beam evaporation tools are shown.
A kinetic model of growth and formation of the crystal structure of gallium arsenide nanowires by molecular beam epitaxy on surfaces activated by Au drops is developed. The thicknesses of alternating layers of cubic and hexagonal phases formed due to fluctuations of the solution composition in the drop are calculated…
γ-Fe 2 O 3 nanoparticles encapsulated in amorphous SiO 2 were prepared by the wet chemical method and carboxyl-modified functionalized nanoparticles were produced. The prepared samples were examined by X-ray diffraction measurements and TEM images. Particles sizes in the range 4-20 nm were determined from the Scherrer…
YbRhSb undergoes a transition at T M 1 = 2.7 K into a canted antiferromagnetic state with a small spontaneous moment of 3 × 10 −3 μ B /Yb. With increasing pressure P , T M 1 ( P ) has a deep minimum of 2.5 K at 1.7 GPa. We have studied the pressure effect on the magnetization, resistivity and specific heat of a single…
Silica/poly(divinylbenzene) (PDVB) composite particles were synthesized by the dispersion polymerization of divinylbenzene (DVB) with ultrafine silica particles in supercritical carbon dioxide (scCO2). Silica particles of average diameter 130 nm were pretreated with 3-(trimethoxysilyl) propyl methacrylate in order to…
O trabalho objetivou o levantamento taxonômico das espécies algais pertencentes à ordem Chlorococcales (Chlorophyceae) do Rio São João, Parque Nacional do Iguaçu, Foz do Iguaçu, Paraná, Brasil. As amostras foram coletadas no período de junho de 2008 a maio de 2009 em três estações de amostragem ao longo do leito do ri…
BACKGROUND: In kinetic crystallography, the usually static method of X-ray diffraction is expanded to allow time-resolved analysis of conformational rearrangements in protein structures. To achieve this, reactions have to be triggered within the protein crystals of interest, and optical spectroscopy can be used to mon…
To simulate the Cesium volatility during the vitrification of radioactive wastes by thermal plasma a computer model is used. This model is based on the calculation of system composition using free enthalpy minimization, coupled with the mass transfer equation at the reactional interface. In this model, the electrolysi…