Materials Literature
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Abstract This series of papers explores the effect of structural characteristics of 2,2,6,6‐tetramethylpiperidine‐based hindered amine light stabilizers (HALS) on the long‐term (40 months) thermal (110°C in air) and photo‐stabilization (Microscal unit wavelength >300 nm) performance characteristics of high‐density…
Abstract Low-temperature magnets derived from [M{N(CN)2}2(pm)] (M = FeII, CoII) have guest molecules incorporated in the clearance of the three-dimensional framework, where pm stands for pyrimidine. A pm molecule in [Fe{N(CN)2}2(pm)](pm) (1) was characterized as a guest by means of X-ray crystallographic analysis. The…
In this work we studied the optical properties of poly[2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene] (MEH-PPV) using polymeric blends with polystyrene (PS). The photoluminescence (PL) spectrum of MEHPPV present three characteristic peaks correlating to aggregate electronic transition at 608, 674 and 742 nm at 1…
The technical and economic aspects of the use of molybdenum depleted in the isotope 95Mo (DepMo) for the transmutation of actinides in a light water reactor are discussed. DepMo has a low neutron absorption cross section and good physical and chemical properties. Therefore, DepMo is expected to be a good inert matrix…
The investigation of self-healing ceramic coatings is of great importance in many critical applications. We have investigated the feasibility of self-healing coatings which automatically repair the damaged part by physical and chemical reaction. In particular, we have focused on swelling clay (hectorite), which expand…
Recently, increasing concern about pollution of groundwater by organic chemicals has led to research on the use of various adsorbents. This study addressed the sorption of phenol and organic compounds by two organoclays and a coal/mineral complex (ARO). The organoclays used were a bentonite from Brazil (SVC) and Wyomi…
This work consists in the preparation of a biodegradable system starting from wood and polymer; this system being a support for the release of active agents. These starting materials used are poly(ε-caprolactone) (PCL), wood, the active agent being KCl. Initially the influence of water, wood and KCl on the reaction of…
Abstract Ethylene‐vinyl alcohol copolymer (EVOH)/clay nanocomposites were prepared via a dynamic melt‐intercalation process using a Brabender Plastograph or extruder. The phase morphology and the crystallization behavior of the nanocomposites were investigated, using differential scanning calorimetry (DSC), X‐ray diff…
The present study investigated the interactions of four different types of polyethylene (PE) surfaces with RF oxygen plasma components, simulating the low Earth orbit (LEO) environment. The samples were exposed in the plasma afterglow, with and without the plasma-generated vacuum UV (VUV) radiation. The polymers studi…
The utility of various synthetic hectorites for the preparation of active enzyme complexes by simple adsorption processes was examined. The smectites compared include commercially available Laponite RD, mesostructured hectorites (both with and without organic template), and silane-modified mesostructured hectorite. Th…
Dense alumina/5 vol% SiC nanocomposites were prepared by sol–gel processing using nanosized (180 nm) precoated SiC powders and a commercial boehmite sol. The SiC powder was precoated with boehmite by a controlled heterogeneous precipitation from an aluminum nitrate solution. The coated SiC powder was then dispersed in…
Different measurements were performed in cross-linked polyethylene (XLPE) employed as insulating material in coaxial cables that were field-aged and laboratory-aged under multistressing conditions at room temperature. Samples were peeled from the XLPE cable insulation in three different positions: just below the exter…
Three Ni-Mn-Ga alloys with different chemical compositions and nonmodulated tetragonal martensitic phase (NM) were studied. In two of the alloys, the polydomain nonmodulated tetragonal phase was obtained in cubic-tetragonal martensitic phase transformation at temperatures below and above Curie point, while in the thir…
The numerical simulation of mass transfer and conversion in spatially heterogeneous biofilms on the meso-scale requires an accurate description of the hydrodynamics in the biofilm systems and of spatial effects. This leads to systems of three-dimensional nonlinear partial differential equations that are numerically ve…
The advances in information communication have increased the usage of microwaves in the 0.5–5 GHz range because of the demand for the transmission of large amounts of data. Accordingly, the problem of electromagnetic interference has become increasingly serious, and therefore much attention has been paid to microwave…
The response of the Baltic diatom <i>Cyclotella meneghiniana</i> to iron deficiency was examined. The following growth parameters were measured: cell number, chlorophyll <i>a</i> and protein content. The results demonstrate the ability of this diatom to grow well with minimal iron availability; however, the rate of gr…
Frequency dependence of the dissipation factor tanδ, the permittivity ɛ, and the ac conductivity σ ac across the layers in the frequency range f =5×10 4 −3×10 7 Hz was studied in layered TlGaS 2 single crystals. A significant dispersion in tanδ was observed in the frequency range 10 6 −3×10 7 Hz. In the range of frequ…
In the 2003 test cycle at the NCAT Test Track, a structural experiment was included to investigate dynamic pavement responses under live truck loading. Instrumentation was installed in different layers of the pavement structures in sections N1 through N8. Data from the instruments are collected in two ways: a data log…
Most facilities for testing the stability of spacecraft materials under attack by fast atomic oxygen (AO) are based on the generation of hypersonic beams of AO in nozzle sources with the use of continuous electrical discharges or in laser pulse-induced breakdown of the gaseous oxygen. In both cases, the sources of fas…
Abstract The effect of iodate (IO 3 − ), metavanadata (VO 3 − ) and molybdate (MoO 4 2− ) anions on the passivation of Ti‐6Al‐4V alloy in sulfuric and hydrochloric acid solutions was studied using open‐circuit potential measurements, polarization techniques and electrochemical impedance spectroscopy (EIS). The alloy s…