Materials Literature
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The process of blowing extrusion has been characterized (Fig. 1, 2, 4, 9). The containers made of bimodal PE-HD were prepared in this way at variable processing conditions i.e. variable temperature (Tm), polymer parison thickness (gw) and different blowing pressure (pb). Functional properties of the products obtained…
Abstract Mg-based alloys with rare-earth alloying elements are promising hardenable lightweight materials with good mechanical properties even at elevated temperatures. Ductility and strength of these alloys can be improved by grain refinement. Ultra fine grained Mg alloys with grain size around 100 nm were successful…
Boron isotope substitution in boron-containing crystalline structures is important because many properties of these materials are structure sensitive. In the present work, we studied the unit cell expansion at the fixed temperature and temperature dependence of thermal expansion for the β-rhombohedral modification of…
A study concerning the characterization of different nanocomposite systems based on epoxy matrix and different forms of CNTs (SW, DW, MW, untreated or functionalised with NH2or COOH groups) is presented. The electrical properties have been measured over a very ample range of frequency (from dc to 12 GHz), applied stre…
Abstract Ultrafine-grained copper and cooper–zirconium polycrystals prepared by equal-channel angular pressing following the route Bc to various strain (1, 2, 4 and 8 passes) were investigated using electron back-scatter diffraction. Equal-channel angular pressing resulted in significant grain-size reduction. The orig…
The method of determination of the bulk values of the rotational viscosity coefficient of the smectic c-director in chiral smectic liquid crystals with a helical structure is described. The measurements were performed using optical detection in the small deformation limit. In contrast to the usual methods, the initial…
Investigations of activation energy barriers for Al surface hopping on α-Al 2 O 3 (0 0 0 1) surfaces have been carried out by means of first-principles density functional theory calculations and the nudged elastic band method. Results show that surface diffusion on the (most stable) Al-terminated surface is relatively…
In this study, reduction and desorption of oxides of nitrogen (NOx) were conducted using an electrical discharge plasma technique. The study was carried out using a simulated gas mixture to explore the possibility of re-generation of used adsorbents by a nonthermal plasma desorption technique. Three different types of…
Carbon nanotubes (CNTs) since their discovery have been the focus of research on account of exceptional chemical, mechanical and electrical properties. However, manipulation and processing of CNTs have been limited by their compatibility with other materials. Considerable efforts have therefore been devoted to the sur…
In order to raise wettability and to improve soil release of polyester (PES) and polypropylene (PP) woven fabrics, atmospheric pressure plasma were applied. In this study, argon and air plasma were used for modification of PES and PP fabrics. The capillary method and contact angle measurements of plasma treated and un…
Blood vessel engineering requires an understanding of the parameters governing the survival of resident vascular smooth muscle cells. We have developed an in vitro, collagen-based 3D model of vascular media to examine the correlation of cell density, O2 requirements, and viability. Dense collagen sheets (100 micron) s…
An enhanced flow sensor is under development at IMTEK to enable simultaneous measurement of thermal properties of a fluid and its flow velocity. Simultaneous measurement of these properties is necessary to measure flow rates accurately by thermal means in cases where fluid properties fluctuate in time. Here, we report…
Current technologies for cell stimulation suffer from a variety of drawbacks. Indeed, precise, localized, and minimally disruptive machine-to-cell interfacing is difficult to achieve. Here we present the organic electronic ion pump (OEIP), a polymer-based delivery system exhibiting high spatial, temporal, and dosage p…
In present paper, binary vinyl monomers mixtures such as methyl methacrylate (MMA) + vinyl acetate (VA), MMA + acrylamide (AAm) and MMA + styrene (Sty) have been graft copolymerized onto flax fiber. 21.32, 38.80 and 25.60 % grafting have been found with MMA+VA, MMA+AAm and MMA+Sty binary monomer mixtures, respectively…
The relation between currents and charges measured in samples during diagnostics of inhomogeneous insulating films is presented. Examples of multilayer structures, quasi-static diagnostic methods, and other examples are considered taking into account currents through film interfaces.
Abstract An in-situ SEM/EBSD technique has been applied to observe initial-stage and late-stage abnormal grain growth in electrodeposited nanocrystalline nickel with the aim of obtaining a comprehensive understanding of the dynamics of abnormal grain growth. We found that the late-stage abnormal grain growth occurred…
Surfactants are widely spread in nature and are increasingly used in industry as wetting, cleaning and disinfecting agents. Recently, there are newly discovered trisiloxanes and other silicone based surfactants which show very unusual spreading behaviour. Although a number of experimental and theoretical investigation…
Abstract Very few reports describing the creep behaviour of materials processed by equal-channel angular pressing (ECAP) have shown that there are both similarities and differences between the creep behaviour of coarse-grained metals and alloys and their ultrafine-grained counterparts. This paper examines these differ…
Results of dielectric studies of MCM-41 molecular sieves with mesoporous channels (37.0 and 24.3 Å in size) loaded with the ferroelectric (NaNO2)1 − x (KNO3) x (x = 0, 0.05, 0.10) are presented. The experimental data on the permittivity and conductivity of the composite are used to calculate the temperature dependence…
The optimization of the formulation (nature and content of chemical components) and the technical parameters of the shaping-up process of ceramic insulators (in replacement of those in glass) are the objectives of this study. The decontamination of SiO2 (solid-liquid extraction of Fe xOy) and the increase of both BaO…