Materials Literature
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Abstract A simple, productive, low-cost route has been developed to synthesize the high-quality 1-D nanorods of CdE (E = Se, Te) with 3–8 nm in diameter and 5–40 nm in length using myristic acid as a complexing agent. Moreover, the reaction is performed under mild conditions and relatively low temperatures. The X-ray…
Abstract Chiral [2.2]metacyclophan-1-ene undergoes an enantiospecific photochromic reaction along with a photoreversible optical rotation change at the wavelength where both photoisomers never absorb. This enables us to carry out a non-destructive read-out of the photomemory made by the photochromic [2.2]metacyclophan…
The crystal structure of filatovite, K[(Al,Zn) 2 (As,Si) 2 O 8 ] (monoclinic, I 2/ c , a = 8.772(1), b = 13.370(2), c = 14.690(2) A, β = 115.944(6)°, V = 1549.1(4) A 3 ) has been solved by direct methods and refined to R 1 = 0.033 on the basis of 1959 unique observed reflections with | F o | ≥ 4σ F . It is isotypic wi…
Abstract We describe the synthesis of water-soluble PEGylated semiconductor nanocrystals and the characterization of their optical properties and colloidal stability by fluorescence and UV spectrometers. The fluorescence intensity of PEGylated CdSe/ZnS in PBS buffer was observed to be 75% of the initial values of conv…
Filatovite, ideally K((Al,Zn)2(As,Si)2O8), has been found in products of fumarolic activity on the second cinder cone of the North breach of the great fissure Tolbachik eruption (1975-76, Kamchatka peninsula, Russia). The mineral occurs as pris- matic crystals up to 0.3 mm and as intergrowths of crystals, in associati…
Abstract A dynamic model of a batch crystallizer was used to estimate the kinetic parameters in a sugar cane crystallization process. The mathematical model included mass, energy, and population balance differential equations, and empirical relationships (power‐law–type) for nucleation, growth, and production–reductio…
The negative effect of electromigration on signal and power line lifetime and functional reliability is an increasingly important problem for the physical design of integrated circuits. We present a new approach that addresses this electromigration issue by considering current density and inhomogeneous current-flow wi…
ZnO–SiO2 nanocomposite films with ZnO nanoparticles dispersed in a silica matrix (molar ratio of ZnO:SiO2 is 25:75) were deposited on quartz glass substrates by the sol-gel method. The optical, microstructural and photoluminescence properties of the films were studied. The films were annealed in air at different tempe…
Results are presented from parallel computations of one-dimensional (1-D) and twodimensional (2-D) microscale heat conduction in multilayered films involving the materials silicon (Si) and silicon dioxide (SiO2). The equation of phonon radiative transport (ERPT), in its spectral as well as frequency-independent form,…
Abstract With the massive changes taking place in the world today, the development of new thermally and mechanically stable polymeric materials is of utmost importance. This article focuses on the synthesis and thermal characterization of a new series of copolyesters that incorporate both aromatic as well as aliphatic…
Poly(anhydride-esters), based on carboxyphenoxydecanoate (CPD), are biocompatible polymers that hydrolytically degrade. The mechanical properties of the poly(anhydride-esters) can be altered by copolymerization with para-carboxyphenoxyhexane (pCPH). Mechanical properties of three CPD:pCPH compositions (30:70, 40:60, a…
The secondary electron emission of an insulating target bombarded by an electronic beam varies as the sample charges up. This evolution is most often described via the conventional approach. However this latter is far from being entirely satisfactory and several observations obviously take it at fault. One can then wo…
Abstract Phosphorus‐containing novolac–epoxy systems were prepared from novolac resins and isobutyl bis(glycidylpropylether) phosphine oxide (IHPOGly) as crosslinking agent. Their curing behavior was studied and the thermal, thermomechanical, and flame‐retardant properties of the cured materials were measured. The T g…
Abstract We investigated the crystalline morphology of isotactic polypropylene obtained by melt crystallization under carbon dioxide (CO 2 ) at various pressures. Spherulites consisting of regularly arranged fibrils without subsidiary lamellae were obtained by crystallization under CO 2 below 2 MPa, whereas large sphe…
Abstract Cobalt ferrite (CoFe2O4) nanoparticles have been prepared by chemical coprecipitation, mechanical milling and subsequent thermal treatment. Sodium chloride was added as a diluent during mechanical milling to avoid agglomeration of the particles. Thermal treatment of the as-milled powder at 600 °C produces wel…
Palygorskite is a Mg-rich fibrous clay, present in nature as a mixture of two intricately intertwined polymorphs – monoclinic ( C2/m ) and orthorhombic ( Pbmn ) – characterized by the presence of channels along Z -axis, filled by weakly bound zeolitic water. A neutron powder diffraction study was carried out by full R…
Abstract The thermomechanical properties of octafunctional cubic silsesquioxane‐modified epoxy resins associated with dicycloaliphatic hardener (4,4′‐dimethyldiaminodicyclo hexyl methane) were studied using thermogravimetric analysis, differential scanning calorimetry, and dynamic mechanical analysis. The structures o…
A systematic study of (A,A')2FeMoO6 (A,A'=Ca, Sr, Ba) ferromagnetic oxides with double perovskite structure has been performed using 95,97Mo and 57Fe NMR spectroscopy. These oxides are isoelectronic but have substantially different Curie temperatures. The NMR analysis provides clear evidence that the magnetic moment a…
The electrical conductance through a ring is sensitive to the threading magnetic flux. It contains a component that is periodic with an Aharonov-Bohm (AB) period equal to the quantum flux. In molecular/atomic loops on the nanometer scale, encircling very small areas, the AB period involves unrealistically huge magneti…
Abstract We isolated α‐chitin, β‐chitin, and γ‐chitin from natural resources by a chemical method to investigate the crystalline structure of chitin. Its characteristics were identified with Fourier transform infrared (FTIR) and solid‐state cross‐polarization/magic‐angle‐spinning (CP–MAS) 13 C NMR spectrophotometers.…