Materials Literature
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Graphene oxide (GO) and chemically modified graphene oxide have been dispersed in low amount (until 0.5 wt%) into epoxy resin. Comparing the dielectric responses of the polymer nanocomposites with those of neat epoxy, no significantly changes were noted. Relevant differences were recorded after a post-curing heating t…
Previous studies have shown that using biodegradable magnesium alloys such as Mg-Zn and Mg-Zn-Al possess the appropriate mechanical properties and biocompatibility to serve in a multitude of biological applications ranging from endovascular to orthopedic and fixation devices. The objective of this study was to evaluat…
Epoxy resin (EX) is widely used for insulation in electric devices, but it has a relatively low thermal conductivity. One approach to obtain a higher thermal conductivity is to introduce inorganic fillers which have high thermal conductivity. Tracking failure is a thermal breakdown phenomenon which has a close relatio…
We demonstrate a method for engineering substrates for surface enhanced Raman spectroscopy (SERS) by Ag − ion implantation in Si. The implantation dose and beam current density are chosen such that the Ag concentration in Si exceeds the solid solubility limit, causes aggregation of Ag and nucleates Ag nano particles.…
Abstract This paper relates an infrared (IR) (6000–2500; 1400–400 cm –1 ) spectroscopic study of sideronatrite, Na 2 Fe 3+ (SO 4 ) 2 (OH)·3H 2 O. Spectra in the 600–1250 cm –1 range are dominated by fundamental S–O absorption bands. Factor-group analysis based on the space group P2 1 2 1 2 1 (D 4 2 ) is in accordance…
We have been proposing a new oxide compound semiconductor, gallium oxide (Ga2O3), as a promising candidate for power device applications because of its excellent material properties and suitability for mass production. The 4.8-eV bandgap and the Baliga's figure of merit of Ga2O3are much larger than those of SiC and Ga…
In this work the amorphous matrix of polystyrene provides a homogenous basis into which nanosilica particles are added. Composites are made with four different types of nanosilica particles which are subsequently compared. The DC breakdown strength of the resulting nanocomposite materials is measured as a function of…
Broken gap metal oxide tunnel junctions have been created for the first time by sputtering. Using a ceramic ZnO-SnO2target and a reactively sputtered copper target we created ZnSnO3and Cu2O for the n-type and p-type layers, respectively. The band structure of the respective materials have theoretical work functions wh…
Poços de Caldas é um importante centro hidrotermomineral do Brasil, o qual apresenta depósitos de argilas não plásticas para as quais não há registros significativos a respeito da caracterização direcionada destes materiais, o que prejudica estudos de aplicação industrial. Estas argilas não plásticas, não aproveitadas…
The influence of filler loading of polyaniline (PANI) and carbon black (CB) on the nonlinear electrical properties as well as the mechanical properties (tensile strength and Young's modulus) of ethylene propylene diene monomer (EPDM) was investigated. It has been found that low field conductivity was most sensitive to…
Methods of enhancing of mechanical properties of ceramic-metal composites, particularly fracture toughness by introducing dispersed metal particles such as W, Mo, Ni, Al, etc to a ceramic matrix are well known. However, the dependence of the microstructures, especially interfaces, on the properties of composites is no…
The composition, stability, existence ranges, and degrees of accumulation of iron complexes in solutions of formic, acetic, propionic, butyric, and valeric acids have been determined with the use of the oxidation function and suggested principle of equilibrium modeling from the experimental data obtained by the oxidat…
Abstract The crystal structure of a Te-rich polybasite has been refined by means of X-ray diffraction data collected at room temperature (space group P m 1; R = 0.0505 for 964 observed reflections and 94 parameters; refined formula Ag 14.46 Cu 1.54 Sb 1.58 As 0.42 S 9.67 Te 1.33 ). The structure comprises stacking of…
In this article we investigate the ultimate scaling potential of multilayer MoS2field effect transistors (FETs) with channel lengths ranging from 1μm down to 50nm using a 20nm thick SiO2back gate and scandium as the source/drain metal contacts. We also report, for the first time, the in-plane dielectric constant for m…
A new closed-form expression is presented for estimating the real-in-line transmission of ceramics consisting of non-absorbing phases in dependence of the inclusion or pore size. The classic approximations to the exact Mie solution of the scattering problem for spheres are recalled (Rayleigh, Fraunhofer, Rayleigh-Gans…
Longevity of entrapped air is an outstanding problem for using superhydrophobic coatings in submersible applications. Under pressure and flowing water, the air micropockets eventually dissolve into the ambient water or burst and diminish. Herein, we analyze from first principles a simple mass transfer problem. We intr…
The paper presents comparative inclined plane test results of high temperature vulcanized silicone rubber and EPDM elastomers filled with alumina trihydrate to 25 wt% under DC. Both the initial tracking voltage and the constant voltage test methods are employed to evaluate the relative tracking/erosion resistance of b…
The purpose of this paper is to establish a dynamic ultracapacitor model which consists of an equivalent circuit model with voltage and temperature effects on its parameters and a thermal model. Identification of parameters in the equivalent circuit model is conducted by alternative current impedance spectroscopy (ACI…
Soft-landing ion mobility has been applied to the development of a reusable surface-enhanced Raman spectroscopic substrate. Sections of silicon wafers were cleaved and modified with 3-(mercaptopropyl) triethoxysilane. After modification, gold was deposited using a soft-landing ion mobility system at thermal kinetic en…
The tunneling photoeffect (PE) has been studied in a microdiode with an electrostatic field localized at an emitter based on a nanodimensional carbon structure. It is established that, when the carbon nanoemitter is exposed to laser and LED radiation photons of low energy (below work function) in the spectral range fr…