Materials Literature
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La 2 Ce 2 O 7 is proposed as a new material for thermal barrier coating that has a higher thermal expansion coefficient and a lower thermal conductivity than traditional coating materials. After long‐term annealing at 1400 °C, the crystal structure of La 2 Ce 2 O 7 was maintained (see Figure). Below 300 °C, thermal co…
Abstract The academic and industrial aspects of the preparation, characterization, mechanical and materials properties, crystallization behavior, melt rheology, and foam processing of pure polylactide (PLA) and PLA/layered silicate nanocomposites are described in this feature article. Recently, these materials have at…
Most dangerous breakdowns are caused by the aging effects of HV insulation systems used within HV components, and there is still a lack of appropriate tools to diagnose such systems non-destructively and reliably in the field. This review introduces the theoretical background of dielectric spectroscopy in the time and…
Hydrogen storage is a materials science challenge because, for all six storage methods currently being investigated, materials with either a strong interaction with hydrogen or without any reaction are needed. Besides conventional storage methods, i.e. high pressure gas cylinders and liquid hydrogen, the physisorption…
The review concerns conservative and dissipative self-organisation phenomena in those physicochemical systems, whose evolution involves formation of diverse chemically complex products, including functional ceramics, supramolecular compounds, and nanocomposites as well as fractal, template and epitaxial structures. It…
The self-assembly of poly(di- n -butylsilane) (PDBS) and poly(di- n -hexylsilane) (PDHS) on the surfaces of amorphous carbon and highly oriented pyrolytic graphite (HOPG) have been investigated, respectively. The morphology and structures of these self-assembled thin films were studied by using atomic force microscopy…
Hexakis[p-(hydroxylmethyl)phenoxy]cyclotriphosphazene was synthesized by the reaction of hexachlorocyclotriphosphazene with the sodium salt of 4-hydroxybenzaldehyde and subsequent reduction of aldehyde groups to alcohol groups by using sodium borohydride. This compound was employed in initiating the ring-opening polym…
The buildup of layer-by-layer (LBL) films from chitosan and the azodye Ponceau-S (PS) was investigated under various experimental conditions, and the resulting films were used in optical storage experiments. The kinetics for the writing process in optical storage was faster for LBL films prepared at low pHs, probably…
DFT-based electronic structure calculations are performed on a series of compounds designed to model the hydrogen bonding present in sulfonic acid-doped polyaniline. A thorough investigation of the structural and electronic influences on the hydrogen bonding at the B3LYP/6-311++G(2d,2p) level reveals a number of previ…
During layerwise growth of crystals, capillarity governs the generation of new crystal layers. Theory predicts that the line tension of the layer edge determines, via the characteristic two-dimensional capillary length L(c), the rates of generation and initial growth of the new layers. To test the correlation between…
Thermal decomposition of poly( p -phenylene benzobisoxazole) (PBO) has been studied between room temperature and 1123 K. Two types of material (regular and high-modulus) were studied, which yielded almost equivalent results. Thermogravimetry and differential thermal analysis allowed establishing the main stages of the…
The nickel(I) β-diketiminates [Me 2 NN]Ni(2,4-lutidine) and [2,4,6-Me 3 NN]Ni(2,4-lutidine) react with NO to form diamagnetic, three-coordinate Ni−NO complexes, and [Me 2 NN]Ni(NO) undergoes insertion with a nitrosobenzene to form the N -aryl- N -nitrosohydroxylaminato species [Me 2 NN]Ni(η 2 -O 2 N 2 Ar). Addition of…
Poly(L-lactide) is a biodegradable polymer primarily used in biomedical applications. In this paper, both the microstructure and the region of dual-phase continuity are examined for binary and compatibilized poly(L-lactide)/polystyrene blends (PLLA/PS) prepared by melt mixing. The blends are shown to be completely imm…
Increasing the ethanol concentration in the tetraethoxysilane (TEOS)−hexadecyltrimethylammmonium bromide (C 16 TMABr)−ammonia−water system at room temperature permits one to obtain a succession of different mesophases in the order MCM-41 → MCM-48 → lamellar phase → radial hexagonally ordered phase. First, the original…
Alkyl-capped and alkyl/alkoxy-capped silicon nanocrystals have been prepared by the oxidation of magnesium silicide with bromine. High-resolution transmission electron microscopy confirmed the crystalline nature of the nanoparticles and provided an average diameter of 4.5 (2.0) nm for the alkyl-capped and for the alky…
Tissue Engineering
Magneto-optical absorption by the quantum dot (QD) with impurity center (IC or D(-)-center) complexes synthesized in a transparent dielectric matrix, with consideration of the QD size dispersion, is theoretically studied. Within the framework of effective mass approach, the analytical expression for the light impurity…
We have studied, by simultaneous force and WAXS measurements, crystallization and melting properties of stretched natural poly cis -isoprene, vulcanized at different rates, in static and dynamic deformations. The overall effects of increasing N C, the number of monomers between cross-link bridges, is to slow the kinet…
Tissue engineering is an emerging biomedical field intended to assist the regeneration of body tissue defects too large to self-repair as well as to substitute for the biological functions of damaged and injured organs by using cells with proliferative and differentiative potential. In addition to basic research on su…
Le comportement au voilement d'éléments poutres en acier est important à comprendre dans le dimensionnement des ossatures métalliques soumises à un séisme. Le radoucissement induit au niveau de la loi moment-courbure conduit à un problème d'évolution élastoplastique mal posé. Un modèle de plasticité au gradient est pr…