Materials Literature
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In this research we describe the preparation of polyimide with pyromellitic dianhydride (PMDA) and p-phenylene diamine (PDA) thin films by physical vapor deposition. For this study, FTIR Spectrometer has been used to measure the effect of imidization temperature on the chemical structure of vapor-deposited thin films…
Nanoparticles are defined as structures in nanometric range - often smaller than 100 nm [1-4]. These particles can be made of sundry materials, the most common being metals, metal oxides, silicates, polymers, carbon, lipids and biomolecules. In addition, they can assume different shapes such as spheres, cylinders, pla…
In this work, we studied the efficacy of corrosion inhibition of carbon steel X70 in HCl 1M solution using ferrocenyl compounds prepared in VPRS laboratory, these compounds are: N-(férrocenyl méthyl)-2-nitro aniline(Fc12), N-(férrocenyl méthyl)-3-nitro aniline(Fc13) and N-(férrocenyl méthyl)-4-nitro aniline(Fc14). The…
Fano interference is predicted in a structure consisting of a periodic array of uncoupled gold nano-disks (AuNDs) supported by a Bragg stack. The phenomenon occurs due to resonant interference between the reflection spectrum of the Bragg stack and localized surface plasmon resonances (LSPRs) on the AuNDs. Fitting the…
The main idea of this work is to investigate the effect of knitted fabrics characteristics on moisture management properties. Wetting and transport properties of single jersey, Rib 1&1 and English Rib fabrics made out of cotton and blended Cotton/Polyester yarns were studied. The dynamic water sorption of fabrics was…
The equilibrium geometric, relative stabilities, electronic and magnetic properties of small Au n Ga– clusters (1 ⩽ n ⩽ 8), in comparison with pure gold cluster anions are investigated systematically within the framework of the first-principles density functional calculations at the PW91PW91 level. The calculations re…
The results of a review of literature data show that electric arc metallizing systems are characterized by high consumption of compressed air. Spraying is accompanied by the high-intensity interaction of the spraying air jet with the liquid metal of the molten ends of the electrodes, leading to rapid burnout of the al…
The optical properties of BaTiO 3 two dimensional photonic crystal (PhC) nanocavities were investigated. Two types of nanocavities consisting of dopants and vacancies with PhC periodicities ranging from 200 to 550 nm were evaluated. The images from laser scanning confocal microscopy show the optical scattering of the…
Recent industrial results around directed self-assembly (DSA) of block copolymers (BCP) have demonstrated the high potential of this technique [1-2]. The main advantage being cost reduction thanks to a reduced number of lithographic steps. Meanwhile, the associated correction for mask creation must account for the int…
The temperature dependence of the ionic conductivity is studied in a series of poly(propylene glycol) diacrylate monomers. The experimental data are analyzed by means of the approach recently proposed by Petrowsky et al. [J. Phys. Chem. B. 113, 5996 (2009)10.1021/jp810095g]. This so-called compensated Arrhenius formal…
We computationally identify the precise mechanism by which metallic platinum aggregates at the tips of cadmium sulfide (CdS) nanostructures. Large-scale atomistic simulations of physically realistic nanorods are used to quantify the chemical, dispersive, and electrostatic contributions to platinum interaction with CdS…
The kinetics of the oxidation of Pb-Sr(Ba) alloys containing up to 1.0 wt % of the alloying component in the liquid state is studied by means of thermogravimetry. The oxidation of the alloys obeys a hyperbolic law. Strontium and barium additives accelerate the oxidation of lead. At 673 K, the true oxidation rate chang…
Surface area of modified mesoporous silicates have been quantitatively determined using x-ray diffraction patterns and chemometric methods. The modified mesoporous silicate samples with varying surface area (223–1164 m2/g) were synthesized and their effective surface areas were calculated by the Brunauer–Emmett–Teller…
The technological aspects of adding carbon–fluorine-containing additions to AN-348, AN-60 and AN-67 fluxes in welding 09G2S steel are investigated. It is shown that the addition decreases the total oxygen content of the welded joint, lowers the degree of contamination with oxide non-metallic inclusions and the level o…
Nano-sized TiO 2 powders were synthesized by a modified hydrolysis reaction using titanium butoxide as a precursor, water as a solvent, acetylacetone to slowdown the hydrolysis and the condensation reactions and ammonia as a base catalyst. Phase transformation and particle size of the calcined powders were investigate…
Recent experimental observations have reported that, rather than randomly distributed, nitrogen atoms may prefer to be located on one of the two sublattices of graphene. It has been suggested that such a preference may present a possible avenue to tailor the band gap of graphene while maintaining its excellent electro…
Abstract The polycrystalline samples La 0.67− x Nd x Sr 0.33 MnO 3 ( x = 0.1, 0.2, 0.3, 0.4, 0.5) were prepared by standard solid‐state reaction method, and the M – T curves, electron spin resonance (ESR) curves, infrared spectra, Raman spectra, ρ – T curves and MR– T curves of the compounds above were measured. The r…
The influences of microstructure, connectivity, and disorder on the critical current density, [Formula: see text], are discussed to clarify the different mechanisms of [Formula: see text] in different magnetic field ranges for in situ and combined in situ/ex situ [Formula: see text] wires with nano SiC and malic acid…
INTRODUCTION: Encapsulation of biologically active molecules into nanoparticles (NPs), for site-specific delivery, is a fast growing area. These NPs must be biocompatible, non-toxic, and able to release their load in a controlled way. We have developed a series of NPs based on (bio)degradable and biocompatible poly(ma…
Stresses produce systematic shifts in the R-line luminescence from Cr3+ ions in aluminium oxide. The two calculational models for determining the stress from observed R-line shifts are compared and combined with new measurements, made under a variety of different stress conditions, to determine refined crystal field m…