Materials Literature
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Abstract Ternary blends of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO), nylon 6, and styrene‐ethylene‐butadiene‐styrene block copolymer grafted with maleic anhydride (SEBS‐ g ‐MA) were prepared via a melt extrusion, and the fracture behavior, morphology, mechanical properties, and rheology were studied. The compatibi…
We report on scanning tunneling spectroscopy investigations at low temperature (5.3 K) on a bare 5-fold surface of an icosahedral Al70Pd21Mn9 quasicrystal. By averaging tunneling spectra recorded over several nm2 we could reproduce the typical line shape observed in point contact spectroscopy on oxidized surfaces. The…
Abstract Chitosan fibers were treated with chloroacetic acid to prepare partially substituted carboxymethyl chitosan fibers. Fibers with different levels of carboxymethylation were prepared by controlling the ratio between the fiber and the amount of chloroacetic acid. The absorption properties of the modified fibers…
TiO 2 thin films were prepared by dc reactive sputtering with different ratios of oxygen to argon. The optical characteristics of the films were studied by birefringence imaging and optical anisotropic analysis using MetriPol. A clear trend of aggregation and structural variation of TiO 2 nanoparticles in the films ca…
Abstract Radiation‐induced compatibility behavior of SBR–EPDM blends of different composition has been investigated using dilute solution viscometry. The results show that at a threshold dose of 10 kGy, good interaction between the components of the blends is achieved. Higher radiation doses lead to formation of cross…
A theoretical interpretation of the Hume–Rothery electron concentration rule has been attempted by performing full-potential linearized augmented plane wave (FLAPW) band calculations for a series of gamma-brasses: Cu5Zn8, Cu9Al4 and TM2Zn11 (TM = Ni, Pd, Co and Fe). The Fourier spectrum of the FLAPW wavefunction was e…
The most extensive data set yet generated correlating photoluminescence excitation (PLE) and photoluminescence (PL) spectra is presented for aged (equilibrated) porous silicon (PS) samples. The observed features, which are temperature independent over the range 10-300 K, show a detailed correlation with the results of…
CeO(2)/YSZ nanocomposite powders, characterized by increasing Ce/Zr atomic ratio, were obtained by depositing, by wet impregnation, different amounts of CeO(2) on the yttria-stabilized zirconia (YSZ) surface. These powders were characterized by means of X-ray photoelectron spectroscopy, transmission electron microscop…
The purpose of this study is to characterize experimentally the whole shape of the growth cells displayed in directional solidification and its evolution with respect to control parameters. A library of cells is first built up from observation of directional solidification of a succinonitrile alloy in a large range of…
Abstract Modification of chitosan by grafting with 4‐vinylpyridine (VP) was carried out both in homogeneous and heterogeneous phases, using potassium persulfate (K 2 S 2 O 8 ) and sodium bisulfite (NaHSO 3 ) as redox initiators. The effect of monomer concentration, initiator concentration and redox ratio, time and tem…
Our investigations in the Zn-rich portion of the Zn–Pd system are related to the idea that a prototypic 1-dimensional (1D) quasicrystal, as defined by the Fibonacci sequence, can be regarded both as a quasicrystal and as an incommensurately modulated crystal. Consequently, there are two different ways to achieve the a…
In order to achieve a deeper insight into the relation between the homogeneity range, crystal structure and disorder phenomena of complex metallic alloy phases (CMAs) we have redetermined the Mg–Pd phase diagram in the range 60–100 at.% Mg. The existence of the intermediate phases Mg6Pd (β), Mg57Pd13 (γ), Mg56.4Pd13.5…
Abstract Poly( ortho ‐aminophenol) has been synthesized electrochemically from a previously deoxygenated acid medium. The initial rate of electropolymerization reaction on platinum electrode is small and the rate law is: Rate = k 2 [D] 0.50 [HCl] 1.125 [M] 1.29 . The apparent activation energy ( E a ) was found to be…
Undoubtedly, the cluster approach has been a very successful and useful tool for describing and modelling the structure of quasicrystals. However, a number of unanswered questions remain as to how stable these clusters are, in what way do they contribute to the stability of quasicrystals and what physical properties t…
We report the formation of an approximant of a dodecagonal quasicrystal in a quasi-two-dimensional lattice Monte Carlo simulation of a star-shaped three-component polymeric alloy. It is associated with the recent striking experimental manifestation of the complex Archimedean tiling (32.4.3.4) consisting of triangles a…
Abstract Low‐density polyethylene (LDPE) with different quantities of starch was compounded using a twin screw extruder and blown into films by a Konar K, blow‐film machine. Mechanical properties, namely percent elongation, tensile, bursting, and tear strength, as well as barrier properties, such as water vapor and ox…
Abstract Excellent crystallinity of material films and atomic control of their surface/interface, sufficient for the realization of their optimal physical properties, are technological premises for modern functional‐device applications. Bi 4 Ti 3 O 12 and related compounds attract much interest as highly insulating, f…
Although hundreds of quasicrystals have been found, little is known about their quantitative composition rules that can help design new materials. In this paper we propose a cluster-based approach to decipher the composition rules. Our approach consists of the following steps: (1) selection of a known basic cluster in…
Abstract Superhydrophobic surfaces present properties of self‐cleaning and unwetting that could be applied in the optics field. The wetting and dewetting of these superhydrophobic surfaces are compared to that of only hydrophobic polyethylene. The contact angle of such a surface varies from 170° to 130–140°. The dewet…
We propose a quantitative measure of a time scale on which Fickian diffusion sets in for supercooled liquids, and we use Brownian dynamics computer simulations to determine the temperature dependence of this onset time in a Lennard-Jones binary mixture. The time for the onset of Fickian diffusion ranges between 6.5 an…