Materials Literature
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A Dynamic Preisach Model for the description of the hysteresis in Nickel Metal Hydride Battery is presented. Both the hysteresis and the dynamical features of charging and discharging cycles are described. The identification of the model is obtained by using a neural network technique developed for magnetic systems. T…
Metallic materials are the most used materials as orthopedic or dental implants due to their excellent mechanical properties. However they are not able to create a natural bonding with the mineralized bone and occasionally suffer localized corrosion. This work describes the electrochemical behavior of a hybrid sol–gel…
This article is concerned with the development of a distributed model based on the modified strain gradient elasticity theory (MSGT), which enables us to investigate the size-dependent pull-in instability of circular microplates subjected to the uniform hydrostatic and nonuniform electrostatic actuations. The model de…
The aim of this work is to evaluate the corrosion resistance of the API SL X52 steel in soil from the Serra do Ouro Branco, Minas Gerais, Brazil. The electrolytes studied were an aqueous extract of the soil and a synthetic solution of the soil medium. The electrochemical techniques used were Tafel analysis and electro…
Spin injection and detection is achieved in freely suspended graphene using cobalt electrodes and a nonlocal spin-valve geometry. The devices are fabricated with a single electron-beam-resist poly(methyl methacrylate) process that minimizes both the fabrication steps and the number of (aggressive) chemicals used, grea…
We study the resonant tunneling effects through double barrier graphene systems (DBGSs). We have considered two types of DBGSs in order to take into account or rule out Klein tunneling effects: (1) the well-known and documented electrostatic-barrier structures (EBSs) created by means of electrostatic probes that act p…
Grazing incidence small-angle x-ray scattering (GISAXS) and x-ray reflectometry (XRR) have been used to investigate structural parameters, especially period length, line width, groove width, and line height, of grating test structures in the sub-micron range. The gratings are e-beam written structures on a quartz subs…
Pd/ZnO/Pd metal-semiconductor-metal photodetectors have been successfully fabricated using a variety of high-quality ZnO nanostructures. The nanostructures used included well-aligned nanorods, tetrapod-like nanorods, and hair-like nanowires and were synthesized on Si (100), porous silicon (PS/Si), and quartz substrate…
We have investigated diffuse reflectance spectra of the polycrystalline BiFeO3, Bi0.9Ba0.05Ca0.05FeO2.95, and Bi0.9Ca0.1FeO2.95 samples to demonstrate crystal-field spectroscopy, which enabled us to explore local distortion in the non-centrosymmetric FeO6 octahedron, and also to study chemical pressure effect on the b…
Electrospun fibers based on aliphatic polyesters, such as poly(ε-caprolactone) (PCL), have been widely used in regenerative medicine and drug delivery applications due to their biocompatibility, low cost and ease of fabrication. However, these aliphatic polyester fibers are hydrophobic in nature, resulting in poor wet…
Asteraceae family - Parthenium hysterophorus plant leaves extract is reported as corrosion inhibitor of mild steel in HCl. Weight loss measurements, Tafel polarization and electrochemical impedance spectroscopy techniques are employed to analyze the effect on steel corrosion. A significant decrease in corrosion rate i…
Yttrium lithium fluoride single crystals doped with trivalent lanthanide ions Pr3+ and Yb3+ are prepared by an improved Bridgman method. X-ray diffraction, photoluminescence excitation, and emission spectra and decay curves are measured to investigate the structural and luminescent properties of the crystals. An effic…
Demonstrations of focusing with metamaterial lenses have predominantly featured two dimensional structures or stacks of planar elements, both limited by losses which hinder realized gain near the focal region. In this study, we present a plano-concave lens built from a 3D self-supporting metamaterial structure featuri…
Microspheres of bovine serum albumin (BSA) and silk fibroin are produced by applying ultrasound in a biphasic system consisting of an aqueous protein solution and an organic solvent. The protein microspheres are dispersed in an aqueous media where the protein remains at the interface covering the organic solvent. This…
The present paper brings report on a newly observed effect of corrosion inhibition of 1-allyl- 1H- indole-2,3-dione (Ind1) against carbon steel corrosion, in hydrochloric acid using gravimetric and electrochemical measurements. Ind1 inhibited the corrosion of carbon steel in 1.0 M HCl solution and the inhibition effic…
New zwitterionic polymer-coated immunoaffinity beads were developed to resist nonspecific protein adsorption from undiluted human serum for diagnostic applications of exosomes. A zwitterionic sulfobetaine monomer with an amine functional group was employed for simple surface chemistry and antifouling properties. An ex…
Biodegradable polymers can be applied to a variety of implants for controlled and local drug delivery. The aim of this study is to develop a biodegradable and nanoporous polymeric platform for a wide spectrum of drug-eluting implants with special focus on stent-coating applications. It was synthesized by poly(DL-lacti…
Summary The Marcellus waters of Pennsylvania and West Virginia commonly contain elevated levels of calcium, barium, and iron. Theoretical analyses of these waters indicate a propensity toward the formation of calcium carbonate, barium sulfate, strontium sulfate, and iron-related scales. The high level of dissolved iro…
Vertically aligned carbon nanotube (VACNT) films have promising applications in solar cells, radiometers, and photonic devices. We have fabricated VACNT films with thicknesses of 10, 36, 45, and 120 μm on silicon substrates. The absorption coefficient of each film is obtained from the measured regular transmittance fr…
This paper deals with a comparison of soft magnetic composites (SMCs) and electrical steel. At first the theory and practice of measuring of the magnetic properties with the ring core method are described. Next a comparison between electrical steel and SMC regarding different frequencies, flux densities and magnetic f…