Materials Literature
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A agroindústria do açaí gera uma grande quantidade de resíduos, constituída de caroços e fibras, o que é um grave problema ambiental e de saúde pública. O objetivo deste estudo foi estudar as fibras do mesocarpo e o caroço do fruto do açaí para sua utilização em materiais compósitos. As amostras foram caracterizadas u…
The tritium imaging plate (TIP) technique has been applied to visualize penetration profiles of hydrogen (tritium) loaded in pure tungsten (W) by a dc glow discharge at a temperature ranging from 473 to 673 K. The penetration profile consists of two components, i.e. a highly localized one in the near-surface region (s…
The Escaig model for thermally activated cross-slip in face-centered cubic (fcc) materials assumes that cross-slip preferentially occurs at obstacles that produce large stress gradients on the Shockley partials of the screw dislocations. However, it is unclear as to the source, identity and concentration of such obsta…
We present the results of a large-scale atomistic study of tensile deformation in a virtual fcc polycrystalline sample with columnar grain structure and a [110] texture. The atomic interaction was described by a volume-dependent central interatomic potential based on first principle calculations and experimental data…
It is shown that semi-empirical potentials for bcc metals based on the non-directional second-moment Finnis–Sinclair approximation are able to predict, as a matter of routine, the non-degenerate core structure for the perfect ½⟨111⟩ dislocation if they correctly describe the inter-string pair potential of a rigid mult…
The outstanding thermal properties of diamond and its low reactivity towards hydrogen may make it an attractive plasma-facing material for fusion and calls for a proper evaluation of its behaviour under exposure to fusion-relevant plasma conditions. Micro and nanocrystalline diamond layers, deposited on Mo and Si subs…
The infrared spectra of uranium oxides (UOx) of various O/U ratios (x = 2–2:667 in UOx) were measured by using ATR-FTIR in order to investigate the applicability of ATR technology to the characterization of uranium oxides or nuclear fuel. The samples of uranium oxides (UOx) were prepared by heating UO2 powder in air a…
The effect of surface treatment on the dynamics of adsorbed poly(methyl acrylate) (PMA) was studied using deuterium NMR and temperature-modulated differential scanning calorimetry (TMDSC). The solid-state deuterium NMR experiments were performed using PMA-d(3), deuterated on the methyl group. The line shape changes fo…
The novel monomeric Ce(IV) alkoxide [Ce(mmp)4] (mmp = OCMe2CH2OMe) (see crystal structure) has been synthesized and structurally characterized. It has been used successfully as a precursor for the deposition of high-purity CeO2 thin films by liquid-injection MOCVD and ALD.
Using molecular simulations, we identify microscopic relaxation events of individual particles in ageing structural glasses, and determine the full distribution of relaxation times.We find that the memory of the waiting time tw elapsed since the quench extends only up to the first relaxation event, while the distribut…
A detailed analysis of the interaction-induced linear and non-linear axial static electric dipole properties and the interaction energy of the model HCHO(HF)(n) (n = 1, 2) complexes is carried out using the HF SCF, MP2, CCSD and CCSD(T) levels of approximation combined with a wide range of basis sets, namely the corre…
Abstract Severe plastic deformation techniques have been widely used to produce bulk ultrafine-grained and nanocrystalline materials. Severe plastic deformation of materials is a complex process that includes both grain refinement via the activities of dislocations and twinning, and grain growth. In this paper, we pre…
Abstract The optical transparency, thermal resistance, intermolecular interaction, and mechanical properties of poly(styrene‐block‐butadiene‐block‐styrene) (SBS), which were modified by blending with crystalline polypropylene (PP) or amorphous polystyrene (PS), were analyzed. The dynamic mechanical test indicated that…
We review some recent approaches to transmission enhancement and light harvesting based on optical nano-antennas and metamaterials. Nano-cavity antennas are used to enhance the extraordinary transmission of TM-polarized light through vertical nano-slits in a metal film. The enhanced transmission of TE-polarized waves…
Abstract The dendrite morphologies and spacings of directionally solidified DZ125 superalloy were investigated under high thermal gradient about 500 K/cm. The results reveal that, with increasing cooling rate, both the spacings of primary and secondary dendrite arms decrease, and the dendrite morphologies transit from…
Fish bones are important sources of collagen and are usually discarded by the processing industries. A response surface methodology was utilized to optimize the extraction process of gelatin from king weakfish (Macrodon ancylodon) bones submitted to alkali pre-treatment. The experimental responses were gel strength an…
Pluronic based core-shell nanostructures encapsulating gentamicin were designed in this study. Block copolymers of (PAA(+/-)Na-b-(PEO-b-PPO-b-PEO)-b-PAA(+/-)Na) were blended with PAA(-) Na(+) and complexed with the polycationic antibiotic gentamicin to form nanostructures. Synthesized nanostructures had a hydrodynamic…
The residual stresses in tungsten targets after repetitive ITER ELM-like plasma pulses have been studied in recent simulation experiments with the quasi-stationary plasma accelerator (QSPA) Kh-50. The experiments were performed for targets preheated at 650 °C, which is above the ductile-to-brittle transition temperatu…
Abstract Nanocomposites were prepared based on diene rubbers and layered clays modified with an alkyl quaternary ammonium cation (organoclay). A diene rubber, either polybutadiene, or synthetic or naturally occurring polyisoprene or styrene-butadiene copolymer, was melt blended with either a preformed organoclay or wi…
In this manuscript we present a new approach for the fabrication of ZnO nanoparticle based semiconducting thin films. The films are obtained by spin coating of stable nanoparticle dispersions with low boiling point ligands. As the ligands might hinder efficient charge transport between the particles in electronic devi…