Materials Literature
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We report the fabrication and characterization of magnetic polymer nanocomposites for a wide range of sensing applications. The composites are made of magnetic nanowires (NWs) incorporated into polymers such as polydimethylsiloxane (PDMS) or UV sensitive SU-8. The developed composites utilize the permanent magnetic be…
We study the spectral properties of the two-dimensional Dirac operator on bounded domains together with the appropriate boundary conditions which provide a (continuous) model for graphene nanoribbons. These are of two types, namely, the so-called armchair and zigzag boundary conditions, depending on the line along whi…
A thermal explosion and self-propagating high-temperature synthesis in low-calorific SiO 2 -Al mixtures subjected to preliminary mechanical activation are obtained. Results of x-ray and electron-microscopic investigations of the microstructure and phase composition of activated mixtures and reaction products are repor…
Environment and situation awareness are key factors to effectively work or even to survive in harsh environment. Over recent decades, the need to adequately protect the human in various dangerous situations has forced the development of clothing industry in the direction to provide high innovative products, and equip…
We present the elastic and dynamical properties of YB 4 from first-principles calculations. It is found that the optimized lattice constants and bulk modulus (182 GPa) agree well with the experimental data. The structural stability of tetragonal YB 4 is confirmed by the calculated elastic constants and phonon spectra.…
In this work, cluster tool (CT) Plasma Assisted Molecular Beam Epitaxy (PA-MBE) grown AlGaN/GaN heterostructure on c-plane (0 0 0 1) sapphire (Al2O3) were investigated by High Resolution X-ray Diffraction (HRXRD), Room Temperature Raman Spectroscopy (RTRS), and Room Temperature Photoluminescence (RTPL). The effects of…
The work reports results of investigations on the properties of pitches produced from the anthracene fraction of coal tar by means of the air-blowing and thermal cracking methods. For comparison, samples of coal tar pitch and air-blown pitches were used. The following parameters were determined: softening point, conte…
Biodegradable carboxymethyl cellulose (CMC) doped with various compositions of NH4Br biopolymer electrolytes (BE) were successfully prepared via a solution-cast technique. The ionic conductivity for the CMC-NH4Br BE system was measured by using impedance spectroscopy, and the highest ambient temperature conductivity w…
It is demonstrated that HCl molecules participate in two steps of acetylene hydrochlorination with gaseous HCl over mechanically activated K2MCl4 (M = Pt or Pd) and K2PtCl6 catalysts, namely, the hydrochlorination of π-coordinated acetylene (rate-limiting step) and protodemetallation. It is confirmed that the same int…
Adiabatic compression plays a fundamental role in the realization of localized enhanced electromagnetic field hot spots, it provides the possibility to focus at nanoscale optical excitation. It differs from the well-known lightning rod effect since it is based on the lossless propagation of surface plasmon polaritons…
A new dataset of the highest quality specimens of fully articulated, juvenile and mature exoskeletons of the Czech middle Silurian trilobite Aulacopleura koninckii offers improved resolution of original morphology by all measures considered. The degree of variation in both size and shape among later meraspid instars w…
In this paper, the effects of different current pulse parameters on the resulting PEO layers are described. The properties of the layers were assessed optically, with a scanning electron microscope, and the corrosion resistance has been measured. It is shown that the polarity and the frequency of the applied current h…
This paper presents an investigation into the temperature rise in induction motors used to power machine tool spindles by considering the effects of loading. To develop a second-order fitted power-loss distribution model for the constant-torque operating range of the induction motor, we employed the design of experime…
In the present study, the effects of nanoparticle addition in a hardening and tempering steel have been investigated. Added through a new technology that ensures safe manipulation, nanoparticles provide the as hardened steel with properties close to those pursued through tempering, making it possible the replacement o…
In this work, aqueous photocatalytic oxidation of humic acid, present in various waters as naturally occurring compound or anthropogenic pollutant, was studied using self-synthesized titanium dioxide coatings. To obtain the latter, template synthesis, widely used for the production of photocatalysts with improved surf…
The main mechanics behavior character of building silicone sealant is its time dependence£¬which lies in the existence of the interior timepiece or the characteristic time. The creep behaviors were fundamental to evaluating the long-term performance of the building silicone sealant under long-term external loading. A…
In this study, organic-based electronic memory structure using selective recognition between histone H3 peptide and heterochromatin protein 1 (HP1) conjugated gold nanoparticles (Au NPs) as charge storage elements is demonstrated. HP1 conjugated Au NPs were formed as self-assembly monolayers (SAMs) on two different H3…
Low-temperature preparation of a Co/Pt layer-stacked film with high-magnetic anisotropy was studied using collimated sputter deposition. Only a trace superlattice line, corresponding to the L11-ordered phase of CoPt, was observed in the X-ray diffraction pattern. However, magnetic properties, exhibited high-saturation…
In this work, highly-ordered TiO2 nanotubes arrays were fabricated by two-step anodic oxidation method to serve as photoanodes for dye-sensitized solar cells. We investigated the effect of TiCl4 treatment on the microstructure and morphologies of TiO2 nanotubes arrays. It is found that the TiCl4 treatment can generall…
Abstract Boriding is performed by diffusing boron atoms into a metal surface and allowing the boron to react with elements present in the substrate to form metal-boride compounds. Upon diffusing enough boron into the surface, a metal-boride compound layer with high hardness precipitates and grows below the surface of…