Materials Literature
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CoCrMo has been successfully employed as an orthopedic and orthodontic material because of its excellent corrosion resistant and suitable biocompatibility. The purpose of this research was to investigate the susceptibility of CoCrMo in Ringer's solution at three different temperatures: 22 °C, 37 °C, and 60 °C. The cor…
The effect of Triton x-100 (non-ionic surfactant), sodium dodecyl sulphate (anionic) and cetyl pyridinium chloride (cationic) on the corrosion rate of copper in 8 M H3PO4 was investigated using potentiodynamic polarization and surface tension measurements. The inhibition behavior of these surfactants was investigated.…
The magnetic properties of calcined cobalt ferrite formed by nano-crystalline powders have been compared by two different methods (co-precipitation and hydrothermal). The structural properties of the produced powders were investigated by X-ray Diffraction (XRD), scanning electron microscopy (SEM). The results show tha…
No Brasil, o potencial paleontológico das diatomáceas ainda é pouco explorado.Para a Planície Costeira do Rio Grande do Sul, o papel suplementar das diatomáceas nos estudos paleoecológicos efetivados torna-se manifesto em função do inexpressivo número de espécies citadas. Além disso, no que tange ao processamento dos…
Tools that may be used to characterize the state of aquatic ecosystems and the impacts associated to pesticides are currently requested for the monitoring of ecosystems. Chemical analysis alone is not sufficient for such purposes and biomonitoring is essential. Many bioindicators based on diatoms are commonly used to…
Wafer Level Chip Scale Packages (WLCSPs) are increasingly being used in Power Management IC (PMIC) applications. Since these packages are typically of small size and low I/O count, the current per bump can be very high for these applications. Therefore, it is important to characterize the electromigration (EM) behavio…
Nanocomposite films based on thermally stable polypyromellitimide are prepared via the introduction of cylindrical and laminar carbon nanoparticles—nanofibers and nanocones/disks—into the prepolymer solution. An increase in the filler concentration increases the elastic modulus and yield stress of the material. Moreov…
A plasma method for obtaining wear-resistant coatings is proposed that enables one to spray powders of different dispersions and composition, as well as to obtain coatings of low porosity and increased hardness. A ceramic or metal powder enters in the jet of thermal plasma where the particles are uniformly heated due…
Differential scanning calorimetry (DSC) and XRD were used to investigate the role of sulfur in the network of V2O5–Fe2O3–BaO glasses. The crystallization kinetics of the glasses were investigated under non-isothermal conditions applying the formal theory of transformations for heterogeneous nucleation to the experimen…
The design of an automated steady state photocarrier grating (SSPG) experiment is presented that matches most of the requirements of an industrial environment. We first briefly recall the bases of the SSPG technique and that the minority carrier diffusion length deduced from this experiment is a key parameter in the f…
The results of deuterium thermal desorption from tungsten after irradiation by 10 keV ions are discussed. A special heating procedure allows features of the fine structure of the thermal-desorption spectra maxima to be revealed.
The comparison research is made of the efficiency of removing U(VI) compounds from wastewaters synthesized by hydrotalcite-like sorbents: intercalated by hexamethylenediaminetetracetic and ethylene diaminetetracetic acids. It has been shown that the efficiency of sorbents for extracting U(VI) from wastewaters at pH 8…
This study demonstrated that a thin ZnO layer functions as a strong adhesion layer between Cu and glass, even when Cu films are formed near room temperature. The adhesion strength was studied with a scratch tester and the films and interfaces were characterized by scanning transmission electron microscopy. The origin…
Paraelectric and ferroelectric phase structures of SrBi2Ta2O9 were calculated using first-principles density functional theory. Berry phase method is used to study the spontaneous polarization in ferroelectric SrBi2Ta2O9. The spontaneous polarizations of SrBi2Ta2O9 experimental and relaxed structures were calculated t…
Adsorption of fine particles in air by a leaf is studied experimentally. It is found that each leaf can absorb only a kind of particles with almost same size, and it also exhibits high selectivity over other particles. The SEM study reveals that the size of nanopore on the epidermis is a main factor of the highly sele…
Interaction of 2-hydroxy-9(10),16(17),23(24)-tri(tert-butyl)phthalocyanine with zinc acetate in the presence of lithium methoxide affords a stable J-type dimer. Its formation was simulated by density functional theory (DFT).
Magnetocaloric effect (MCE) in polycrystalline HoMn 2 O 5 was investigated by isothermal magnetization curves from 2 K to 50 K. A relatively large magnetic entropy change, Δ S M = 7.8 J/(kg · K), was achieved with the magnetic field up to 70 kOe (1 Oe = 79.5775 A · m −1 ). The magnetic entropy change is reversible in…
SUMMARY This paper aims at presenting a general consistent numerical formulation able to take into account, in a coupled way, strain rate, thermal and damage effects on the behavior of materials submitted to quasistatic or dynamic loading conditions in a large deformation context. The main features of this algorithmic…
To realize safer, cleaner and yet economically competitive production of printed circuit board (PCB), a simple electrolytic process for simultaneous copper (II) chloride etchant regeneration and copper recovery is proposed and investigated. A three dimensional anode made of carbon felt is used to oxidize copper (I) io…
The Young’s modulus of multilayer films containing cellulose nanocrystals (CNCs) and polyethyleneimine (PEI) was measured using a buckling-based method and compared to analogous films containing nanofibrillated cellulose (NFC) and PEI [1]. For films 61 nm to 1.7 μm thick, the Young’s modulus was constant but strongly…