Materials Literature
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In this study we investigate on the possible use of a new kind of magnetic nanostructures as drug delivery systems for anticancer drugs. The starting particles are formed by an inner core of iron, coated by magnetite as a stabilizing, magnetic layer. These units are further coated by a poly(ethylenglycol) (PEG) layer…
The “polar catastrophe” hypothesis on the mechanism of the formation of a two-dimensional conducting channel at the interface between two insulators is investigated experimentally. In particular, the influence of the concentration of dipolar groups at one of the surfaces on the electrical conductivity along the interf…
A utilização de nanomateriais em sistemas de segurança alimentar, detecção de patógenos, proteção de ambientes, no diagnóstico e tratamento de doenças, como sistema de entrega de fármacos e na bioengenharia tecidual tem contribuído para os avanços alcançados na ciência animal. Suas propriedades físicas, químicas e mec…
This paper describes a study on the development of few textile structures and the possibility to use them in electromagnetic shielding and protection equipment manufacturing. The long-term exposure to electromagnetic waves can seriously damage a person's health. The goal of this research is: to evaluate the implementa…
Nano-MgO particles were mixed into neat epoxy to obtain epoxy/MgO nanocomposites with percentages weight ratios of the nanofiller to the base epoxy of 1, 3, 5, 7 wt%. Tracking experiments were carried out by using positive dc voltage. The tracking process and discharge current were measured and the relation with the a…
An equilibrium mixture of monoclinic pyrrhotite and pyrite was synthesized in the eutectic AlCl 3 - KCl melt at 525 K. The reaction 7FeS 2 (cr) + 12Ag(cr) = 8Fe 0.875 S(cr) + 6Ag 2 S(cr) was studied by an electromotive force technique in an all-solid-state electrochemical cell with an Ag + -conductive solid electrolyt…
Zinc bismuth silicate glasses having composition 20ZnO∙(80-x)Bi 2 O 3 ∙xSiO 2 (with x = 0, 10, 20, 30, 40 and 50 mol%) were prepared by the conventional melt-quench technique. The compositional dependence of density (D), molar volume (V M ) and glass transition temperature (T g ) were analyzed and correlated with…
We investigated the impact of strain relaxation on the current transport of Pr0.48Ca0.52MnO3 (PCMO) thin films grown epitaxially on SrTiO3 single crystals by pulsed laser deposition. The incorporation of misfit dislocations and the formation of cracks are identified as competing mechanisms for the relaxation of the bi…
The main purpose of this study is to detect di erent ecologically harmful substances in aqueous solutions using surface enhanced Raman spectroscopy (SERS) as a tool. Therefore, assigning the vibrational modes is essential to identify the substances. SERS using silver nanoparticles was used to obtain reproducible inten…
Carbon nanotube (CNT) film nanobolometers take advantages of high infrared absorption of CNTs, proving a promising alternative for low-cost, uncooled infrared detection. The performance of the CNT nanobolometers is determined by the optoelectronic process on CNTs at a microscopic scale, which links intimately to the d…
The existence of an extensive network of main pipelines, both already operating and being constructed, which are exploited under complex climatic conditions, specifies the need for the development of methods of a nondestructive control for testing the current state of both the pipes themselves and the welded joints in…
In this work, the effect of ZnO nanoparticles as activator is studied in unfilled natural rubber and compared with conventional ZnO on cure characteristics and mechanical properties. ZnO nanoparticles are synthesized by precipitation method using zinc nitrate tetrahydrate and sodium hydroxide as precursor. Particle si…
Nitrile butadiene rubber (NBR) comes into widespread applications due to the excellent performances, but it is susceptible to aging during its storage and usage periods. This paper surveys the external factors that act on the aging process of NBR. The aging of NBR in liquid environment, and non-liquid environment such…
Linear isotactic polypropylene (PP) was chemically modified by solvent-free, peroxide-initiated grafting of trimethylolpropane trimethacrylate and triallyl trimesate. The resulting coagent-modified PP materials possessed bimodal molecular weight and branching distributions, whose populations varied with coagent struct…
Here we report a facile approach to enhance the dispersibility of ethylene vinyl acetate copolymer (EVA)/silica nanocomposites (for the EVA/silica nanocomposites and interaction between silica nanoparticles (nanosilica) and EVA by adding EVA-g-acrylic acid (EVAgAA) as a compatibilizer, which was formed by grafting acr…
The repetitive impulsive surges from inverters has been found undoubtedly to cause insulation reliability flaws in inverter-fed motors. To mitigate this problem, PD detection and life testing under sinusoidal and/or repetitive square voltages should be performed on new types of inverter-fed motor insulation, according…
Extensive numerical results for the thermodynamic density of states (i.e. quantum capacitance) of a two‐dimensional massless Dirac fermion fluid in a doped graphene sheet are presented. In particular, by employing the random phase approximation, the impact of screening exerted by a metal gate located nearby a graphene…
This study is focused on the clay deposits at Akerebiata area in Ilorin (north-central Nigeria), southwestern basement complex, Nigeria. The chemical and mineralogical compositions of the clays were investigated with the aim of determining their provenance, weathering history and most suitable use. X-Ray Diffraction (…
This Paper Aims to Determine by Experiment Total Force and Stress of Deformation Depending on Punch Stroke and the Level of Deformation on Severe Plastic Deformation of Aluminum by Multiaxial Cold Forging. the Deformation Force in Multiaxial Forging Depends on a Number of Parameters of whom the most Important are: Str…
Polyethylene has been one of the widely studied polymeric insulation materials. One of the major issues related to polymeric materials is the easy formation of space charge which may cause electric field enhancement. In this paper, a numerical simulation based on a bipolar charge injection/transport model is used to o…