Materials Literature
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The alteration of a crystalline state or the optical isomerism of a substance significantly affects the physicochemical, pharmacotechnological properties, and bioavailability of drugs. It was shown that X-Ray powder diffraction, infrared Fourier spectroscopy, differential scanning calorimetry, optical microscopy, and…
The Jenckel equation for the temperature dependence of the free activation energy of viscous flow of inorganic glasses has been satisfactorily interpreted within the hole-activation model of viscous flow. “The formation of a fluctuation hole” (deformation of a region of the network) characterizes a preliminary local c…
Partial discharges occur in medium and high voltage insulation systems which result in the degradation of the system and lowers performance life. Research on methods to lower partial discharges or contain harmful effects of this phenomenon is of utmost importance. The use of coupling agents has shown to increase the p…
Critical parameters of the morphological development of an electrode surface at the anodic oxidation of silver-based Ag-Pd alloys are estimated. Conditions (potential range and compositions of the alloy and electrolyte solution) of the true selective dissolution of the alloys in an acidic nitrate medium are determined…
Solvent evaporation-induced self-assembly was adopted to prepare regular aggregates. This process included two steps. Firstly, the amphiphilic polystyrene-block-poly (acrylic acid) (PS-b-PAA) micelles which were synthesized via atom transfer radical polymerization (ATRP) self-assembled into cubic nanomicelles in THF/w…
A new equation is proposed to calculate the superconducting transition temperature using the dependences obtained earlier for the defect formation energy and based on relaxed velocities and frequencies of elastic vibrations. The kinetic energy of elastic waves is shown to be related to ionization potentials I of simpl…
A latitude method for the trajectory planning of spraying on spherical surface is presented. The latitude method is used to optimize the time and coating thickness in the spray painting. The start curve, the velocity of the spray gun and the width between neighboring paths are the main factors to affect the final coat…
Lanthanum magnesium hexaaluminate (LaMgAl11O19, LMA) has attracted much interest as its widely used in solid state lasers, TV phosphors and fluorescent lamps. In this paper, LaMgAl11O19 ceramic was pressureless sintered at 1650 °C for 10 h in air atmosphere using LaMgAl11O19 powders prepared by solid-state reaction at…
Self-lubricative ceramic coatings were prepared on Q235 carbon steel by plasma electrolytic oxidation (PEO) in aluminate electrolyte containing graphite. The microstructure of the PEO coatings were examined. Influence of graphite in electrolyte on the coating growth properties was analyzed according to the voltage vs.…
Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.
A giant exchange bias is detected in the colossal magnetoresistance of Nd2/3Ca1/3MnO3 perovskite at low temperatures and is evidence of intrinsic exchange coupling in this compound. These phenomena confirm our previous assumption that the low-temperature magnetic structure of this compound consists of small (nanosized…
In this paper, epoxy based nanocomposites were prepared by adding inorganic alumina nano-particles and organic nitrile rubber nano-powders. The effects of two kinds of nano-particles on the curing kinetics of epoxy nanocomposites were investigated by differential scanning calorimetry (DSC). The dielectric properties o…
Investigation results for electrocontact materials based on silver and copper and modified by nanoparticles are presented. Their optimum compositions; technological production features; and physical, mechanical, and operational properties are determined and the microstructure is studied. It is shown possible to replac…
This paper describes the development of colloidal Au-SiO2 with core-shell structure nanoparticle radioactive tracers by neutron activation in nuclear reactor that produce Au-198 (T1/2=2.7 d) emitting gamma ray of 412 keV. Using conventional citrate-reduction method, gold nanoparticles were prepared from its correspond…
Alzheimer's disease is characterized by senile plaques and neuro-fibrillary tangles. Amyloid precursor protein is cleaved during proteolytic processing by ß and g secretase at N and C terminal respectively to form 42 or 43 amino acids residue amyloid beta peptide. Amyloid beta peptide contains cross beta structure mot…
This paper presents the results of investigations of the ceramic samples of perovskite type solid solution (Pb1−xLax) (Zr1−yTiy)O3(PLZT — with x = 0.02, 0.03, 0.06 and 0.10, y = 0,9). Ceramic samples have been obtained from oxides using classical ceramic technology. The investigations results of microstructure, XRD, d…
The possibilities of using newly developed nano-and micro-thin films are intensively studied at the present time. Many research institutions are looking for ways to evaluate and compare mechanical properties of these films. One of the most important and frequently studied characteristics is practical adhesion. A very…
The solid solution between bismuth ferrite and lead titanate (xBiFeO3-(1-x)PbTiO3or BFPT) possesses a morphotropic phase boundary (MPB) between the rhombohedral and tetragonal forms at x=0.7. It is of interest to investigate the influence of field-driven rhombohedral-tetragonal phase transitions across the MPB, to det…
Mechanoacoustic method was used to obtain ultrafine suspensions based on chitosan solutions and inorganic fillers. The rheological properties of the resulting suspensions, their finishing capacity for linen materials, and sorption capacity for copper ions of the fibrous sorbents obtained were examined.
A new method of sustainable ethanol synthesis by hydrogenating dimethyl oxalate (DMO), which is easily obtained from syngas, over a Cu/SiO2catalyst is proposed based on previous works. The experimental results indicate that the Cu/SiO2catalyst exhibited a high activity under the relative mild conditions of 270°C and 2…