Materials Literature
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O consumo de pizzas prontas aumentou nos últimos anos dado à praticidade do produto e ao baixo custo, sabor agradável e valor nutritivo. Porém, esse produto sofre intensa manipulação durante o seu processamento, contribuindo para sua contaminação, diminuindo a qualidade e aumentando os riscos de doenças veiculadas por…
Hierarchical alveolate structures in nano- to microscale were fabricated on both aluminum and stainless steel substrates via a chemical etching. On aluminum surfaces, sharp edged caves and plateaus were found. On stainless steel substrate, fine papillae stand on protuberances. These surfaces exhibit super-hydrophobic…
The electronic configuration of a set of PbSe/PbS core-shell colloidal quantum dots (CQDs), with a common core radius of 1.5 nm having a PbS shell of a variable width from 0.75 to 2.5 nm, was investigated by scanning tunneling spectroscopy. The conductance resonance spectra were correlated with a band tunneling proces…
Recent work on ductile hole enlargement under plane-stress conditions has revealed that while the internal pressure does not reach a saturation level, the energy increment required to create a nominal hole volume increment admits a finite asymptotic value. This specific cavitation energy, which is identified with the…
Graphene's low-energy electronic excitations obey a $2+1$-dimensional Dirac Hamiltonian. After extending this Hamiltonian to include interactions with a quantized electromagnetic field, we calculate the amplitude associated with the simplest, tree-level Feynman diagram: the vertex connecting a photon with two electron…
This work deals with the design evaluation of n-ZnO/p-cSi and p-ZnO/n-cSi heterojunction solar cells using two dimensional numerical computer aided design tool (TCAD). Various physical parameters of the layer structure such as doping and thickness of the ZnO and cSi layers have been studied. The device performance is…
The Sb2O3 doping lead-free glass in Bi2O3-B2O3-BaO ternary system were prepared in the composition of several different subsystem, and the glass powder was produced through the process of water quenching. Glass transition temperatures (T g ), glass soften temperatures(T s ), the volume resistivity (ρ) in the temperatu…
Solid solutions of (1-z) (Sr0.7Bi0.2◻0.1)TiO3+z(Na0.5Bi0.5)TiO3 (z=0–1) system are synthesized. Dielectric measurement reveals that two dielectric anomalies exist over the temperature range of 150–680 K. One is the dielectric peak with significant frequency dispersion below 500 K, whose nature evolves from a ferroelec…
The present article proposes a dynamical model to obtain ferroelectric hysteresis dynamics based on fractional derivatives. The consideration of a fractional derivative term widely increases the frequency bandwidth of the accuracy of the traditional hysteresis models. As a consequence, the model is suited for successf…
Molecular-dynamic simulation of low-temperature plastic deformation (T def = 50 K, T def/T g ≤ 0.3) is studied for glassy polymethylene under the regime of active uniaxial compression and tension for a cell composed of 64 chains containing 100 -CH2 groups in each (as united atoms) and with periodic boundary conditions…
We report the vacuum ultraviolet luminescence characteristics of a micro-pulling down method grown Er3+:LiCaAlF6. Emission at 163 nm with a lifetime of 1.3-μs observed with F2laser (157-nm) pumping. This is one of the shortest emission wavelengths reported from a rare-earth doped fluoride at room temperature.
Porous Silicon (PS) is one of the established materials and can be used in variety of applications in its different forms. Use of monolayer PS film for synthesis of Si QDs is reported here. Nanometer-sized silicon particles are produced by ultrasonic dispersion of thin films in DI water. PS films are characterized usi…
Highly (100) and (111)-oriented Pb0.97La0.02(Zr0.85Sn0.13Ti0.02)O3 antiferroelectric (AFE) thin films were fabricated through a sol-gel processing. The effects of orientation on phase transformation behaviors and strains of the AFE thin films were studied systemically. As compared to (100)-preferred AFE thin films, th…
Abstract Silicon nanostructure-based light emitting devices (nc_SiLED) have been fabricated using conventional microelectronic technologies. The emissive layer composed of silicon and silicon dioxide was deposited by magnetron co-sputtering. Under forward bias, a broad electroluminescence (PL) spectrum in the range 45…
This review summarizes the experimental findings of the effect of noble metals and wide bandgap semiconductor nanoparticles on microorganisms in dark conditions and during nanoparticle excitation using light. Contemporary views on the biochemical mechanisms silver nanoparticles (SNs) act on bacteria as compared to the…
We propose a model of nonlinear deformation of shape memory alloys (SMA) under phase and structure transitions which reflects the basic characteristics of the phenomena that occur in these materials at the microlevel. The model takes account of the influence on the processes in SMA not only of the applied external mac…
We report heteroepitaxial growth of (101 2) oriented (r-plane) ZnO films on Si(100) substrates. The films were grown by pulsed laser deposition and integration of ZnO with silicon was achieved using a tetragonal yttria stabilized zirconia (YSZ) buffer layer. It was observed that ZnO films grown at temperatures in the…
The quality of a paper towel is often judged based on how quickly it can wipe up a spill. However, the test methods currently available cannot repeatably measure significant differences in absorbent rate between samples. Recent round-robin testing evaluations by TAPPI and CEN organizations have shown that past methods…
Conducting polypyrrole (PPy) films are prepared by mixing a solution of pyrrole with an oxidizing solution of FeCl3. UV-VIS and IR spectroscopy are used for determining the reaction mechanisms. The rate of pyrrole polymerization is determined by the rate of the initial electron-transfer reaction. The surface morpholog…
Abstract Mechanical reinforcement in nanofilled polymer melts and elastomers was investigated with emphasis on low filler concentrations ranging from zero to 12.5 vol. %. Composite samples were prepared using a poly(vinyl acetate) matrix with each of three different filler types. Two fumed-silica fillers with differen…