Advanced Materials Research Vol. 880

Abstract: In work bactericidal properties of system "TiO₂ nanoparticles - the polypropylene fibrous carrier" are defined at impact of ultra-violet radiation concerning gram-positive and gram-negative bacteria and conditions under which this property is realized are defined.

Abstract: This article is devoted to research possibility of high-temperature silicate melts producing from feldspar wastes of molybdenum ores enrichment (Khakassia) with use of low-temperature plasma energy.

Abstract: The presented radiation model allows evaluating the contribution of ohmic contacts metal-semiconductor into LED radiation resistance and, thus, can be used when developing the design and the production technology of LED with required radiation resistance.

Abstract: The model of phase structure formation of the surface during electron beat with modifying particles is described. The role of particles mixing in the formation of the surface layer is investigated numerically. It is shown that melt turbulent mixing leads to more fast particles dissolution in the melting pool and to more homogeneous composition in comparison with the model without mixing.

Abstract: The paper is dedicated to nickel nanoparticles dissolution in simulated body fluids. By the example of industrial electroexplosive nickel nanopowder it has been demonstrated that dissolution degree in simulated lung fluid and simulated saliva can reach 98.0 and 62.8 wt.% for 24 hours, respectively. The mechanism of nickel dissolution has been proposed. It includes the dissolution of energy saturated oxide film, formed in oxygen saturated simulated saliva, the formation of nickel hydroxycitrate in simulated lung fluid as well.

Abstract: While bio(organic-inorganic) compatibility and absence of cytotoxicity are crucial to create a successful nanocarrier for applications in biosensing and drug delivery, the study of its stability before commercialization is quite important. In the present work, the stability of gold nanoparticles (AuNPs) functionalized with L-Cysteine (Cys) and Cysteine-Glycine (Cys-Gly) was studied. The AuNPs surface modification with Cys and CysGly was performed to improve their biocompatibility and, after that, the stability of capped AuNPs was investigated. The synthetized AuNPs using 10 mM of cysteine and 20 mM of Cys demonstrated stability after 1 month of storage, while all other concentration ratios resulted in the formation of chain-like conglomerates. For AuNP capped with CysGly all modifier concentrations led to stable samples within 1 month of storage.

Abstract: The problem of material treatment by the beams of particles for non-isothermal conditions is solved analytically. The thermal diffusion is taken into account. The stress and strain evaluation in the treatment zone is carried out using the methods of thermal elasticity theory (for the elastic body) and analogy method in the space of Laplace integral transform (for the viscoelastic body). It is shown that the thermal diffusion is the most essential for the body with small viscosity.

Abstract: The wear resistant composite coatings on the basis of titanium borides, which are synthesized from thermoreactive powder components of a boron-containing mixture at electron beam surfacing, are interesting for applications today.

Abstract: The literature about the mold plastering casting structures applied in alloying the casting coating by various alloys was examined. On the basis of the examined literature the main conditions are revealed, which should be observed for the implementation of the alloying process. The data on plastering structures used for the casting molds with various heat conductivity is presented. The influence of such alloying on the structure and property both of the casting surface and the properties of the finished products is shown. The data on a classical set of covering components and on the features of the elements comprising them is also provided. The conditions necessary for the casting surface alloying by the nanopowder of the casting mold covering are described. A number of cases is described when such alloying was applied and was successful. The changes of the casting surface properties are described.

Abstract: A method for the trace analysis of rhodamine and eosine with colorimetric measurements based on solid-phase extraction (SPE) by transparent polymethacrylate matrix (PMM) is described. Solid-phase extraction on PMM allowed a 380-fold enrichment of the dyes if 10 mL sample volume is used with extraction efficiencies 98%. The method enables the determination of rhodamine to 0.06 mg/L and eosine to 1.2 mg/L combined with a fast and easy sample-preparation (pH-adjusting prior to SPE). Simultaneous extraction and determination of rhodamine and eosine in reservoir samples with high salinity confirmed the applicability and reproducibility of the method. Batch adsorption results indicated that Langmuir isotherm described the adsorption isotherms better.